[PATCH 5.15 011/107] drm/i915/backlight: extract backlight code to a separate file

Greg Kroah-Hartman
2022-09-06T13:47:54Z

From: Jani Nikula <jani.nikula@intel.com>

[ Upstream commit 6cc42fbeb150ff33b17cbf108713ca4be23994d8 ]

In a long overdue refactoring, split out backlight code to new
intel_backlight.[ch]. Simple code movement, leave renames for follow-up
work. No functional changes.

Cc: Lyude Paul <lyude@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/97d310848f03061473b9b2328e2c5c4dcf263cfa.1629888677.git.jani.nikula@intel.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/i915/Makefile | 1 +
drivers/gpu/drm/i915/display/g4x_dp.c | 2 +-
drivers/gpu/drm/i915/display/icl_dsi.c | 1 +
.../gpu/drm/i915/display/intel_backlight.c | 1778 +++++++++++++++++
.../gpu/drm/i915/display/intel_backlight.h | 51 +
.../gpu/drm/i915/display/intel_connector.c | 4 +-
drivers/gpu/drm/i915/display/intel_ddi.c | 2 +-
drivers/gpu/drm/i915/display/intel_dp.c | 1 +
.../drm/i915/display/intel_dp_aux_backlight.c | 2 +-
drivers/gpu/drm/i915/display/intel_lvds.c | 1 +
drivers/gpu/drm/i915/display/intel_opregion.c | 3 +-
drivers/gpu/drm/i915/display/intel_panel.c | 1767 +---------------
drivers/gpu/drm/i915/display/intel_panel.h | 34 +-
drivers/gpu/drm/i915/display/vlv_dsi.c | 1 +
14 files changed, 1843 insertions(+), 1805 deletions(-)
create mode 100644 drivers/gpu/drm/i915/display/intel_backlight.c
create mode 100644 drivers/gpu/drm/i915/display/intel_backlight.h

diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index 26cf754229451..9d371be7dc5cd 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -249,6 +249,7 @@ i915-y += \
display/g4x_dp.o \
display/g4x_hdmi.o \
display/icl_dsi.o \
+ display/intel_backlight.o \
display/intel_crt.o \
display/intel_ddi.o \
display/intel_ddi_buf_trans.o \
diff --git a/drivers/gpu/drm/i915/display/g4x_dp.c b/drivers/gpu/drm/i915/display/g4x_dp.c
index de0f358184aa3..29c0eca647e34 100644
--- a/drivers/gpu/drm/i915/display/g4x_dp.c
+++ b/drivers/gpu/drm/i915/display/g4x_dp.c
@@ -7,6 +7,7 @@

#include "g4x_dp.h"
#include "intel_audio.h"
+#include "intel_backlight.h"
#include "intel_connector.h"
#include "intel_de.h"
#include "intel_display_types.h"
@@ -16,7 +17,6 @@
#include "intel_fifo_underrun.h"
#include "intel_hdmi.h"
#include "intel_hotplug.h"
-#include "intel_panel.h"
#include "intel_pps.h"
#include "intel_sideband.h"

diff --git a/drivers/gpu/drm/i915/display/icl_dsi.c b/drivers/gpu/drm/i915/display/icl_dsi.c
index 638a00b2dc2d2..2601873e15466 100644
--- a/drivers/gpu/drm/i915/display/icl_dsi.c
+++ b/drivers/gpu/drm/i915/display/icl_dsi.c
@@ -29,6 +29,7 @@
#include <drm/drm_mipi_dsi.h>

#include "intel_atomic.h"
+#include "intel_backlight.h"
#include "intel_combo_phy.h"
#include "intel_connector.h"
#include "intel_crtc.h"
diff --git a/drivers/gpu/drm/i915/display/intel_backlight.c b/drivers/gpu/drm/i915/display/intel_backlight.c
new file mode 100644
index 0000000000000..4b0086ee48519
--- /dev/null
+++ b/drivers/gpu/drm/i915/display/intel_backlight.c
@@ -0,0 +1,1778 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2021 Intel Corporation
+ */
+
+#include <linux/kernel.h>
+#include <linux/pwm.h>
+
+#include "intel_backlight.h"
+#include "intel_connector.h"
+#include "intel_de.h"
+#include "intel_display_types.h"
+#include "intel_dp_aux_backlight.h"
+#include "intel_dsi_dcs_backlight.h"
+#include "intel_panel.h"
+
+/**
+ * scale - scale values from one range to another
+ * @source_val: value in range [@source_min..@source_max]
+ * @source_min: minimum legal value for @source_val
+ * @source_max: maximum legal value for @source_val
+ * @target_min: corresponding target value for @source_min
+ * @target_max: corresponding target value for @source_max
+ *
+ * Return @source_val in range [@source_min..@source_max] scaled to range
+ * [@target_min..@target_max].
+ */
+static u32 scale(u32 source_val,
+ u32 source_min, u32 source_max,
+ u32 target_min, u32 target_max)
+{
+ u64 target_val;
+
+ WARN_ON(source_min > source_max);
+ WARN_ON(target_min > target_max);
+
+ /* defensive */
+ source_val = clamp(source_val, source_min, source_max);
+
+ /* avoid overflows */
+ target_val = mul_u32_u32(source_val - source_min,
+ target_max - target_min);
+ target_val = DIV_ROUND_CLOSEST_ULL(target_val, source_max - source_min);
+ target_val += target_min;
+
+ return target_val;
+}
+
+/*
+ * Scale user_level in range [0..user_max] to [0..hw_max], clamping the result
+ * to [hw_min..hw_max].
+ */
+static u32 clamp_user_to_hw(struct intel_connector *connector,
+ u32 user_level, u32 user_max)
+{
+ struct intel_panel *panel = &connector->panel;
+ u32 hw_level;
+
+ hw_level = scale(user_level, 0, user_max, 0, panel->backlight.max);
+ hw_level = clamp(hw_level, panel->backlight.min, panel->backlight.max);
+
+ return hw_level;
+}
+
+/* Scale hw_level in range [hw_min..hw_max] to [0..user_max]. */
+static u32 scale_hw_to_user(struct intel_connector *connector,
+ u32 hw_level, u32 user_max)
+{
+ struct intel_panel *panel = &connector->panel;
+
+ return scale(hw_level, panel->backlight.min, panel->backlight.max,
+ 0, user_max);
+}
+
+u32 intel_panel_invert_pwm_level(struct intel_connector *connector, u32 val)
+{
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ struct intel_panel *panel = &connector->panel;
+
+ drm_WARN_ON(&dev_priv->drm, panel->backlight.pwm_level_max == 0);
+
+ if (dev_priv->params.invert_brightness < 0)
+ return val;
+
+ if (dev_priv->params.invert_brightness > 0 ||
+ dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) {
+ return panel->backlight.pwm_level_max - val + panel->backlight.pwm_level_min;
+ }
+
+ return val;
+}
+
+void intel_panel_set_pwm_level(const struct drm_connector_state *conn_state, u32 val)
+{
+ struct intel_connector *connector = to_intel_connector(conn_state->connector);
+ struct drm_i915_private *i915 = to_i915(connector->base.dev);
+ struct intel_panel *panel = &connector->panel;
+
+ drm_dbg_kms(&i915->drm, "set backlight PWM = %d\n", val);
+ panel->backlight.pwm_funcs->set(conn_state, val);
+}
+
+u32 intel_panel_backlight_level_to_pwm(struct intel_connector *connector, u32 val)
+{
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ struct intel_panel *panel = &connector->panel;
+
+ drm_WARN_ON_ONCE(&dev_priv->drm,
+ panel->backlight.max == 0 || panel->backlight.pwm_level_max == 0);
+
+ val = scale(val, panel->backlight.min, panel->backlight.max,
+ panel->backlight.pwm_level_min, panel->backlight.pwm_level_max);
+
+ return intel_panel_invert_pwm_level(connector, val);
+}
+
+u32 intel_panel_backlight_level_from_pwm(struct intel_connector *connector, u32 val)
+{
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ struct intel_panel *panel = &connector->panel;
+
+ drm_WARN_ON_ONCE(&dev_priv->drm,
+ panel->backlight.max == 0 || panel->backlight.pwm_level_max == 0);
+
+ if (dev_priv->params.invert_brightness > 0 ||
+ (dev_priv->params.invert_brightness == 0 && dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS))
+ val = panel->backlight.pwm_level_max - (val - panel->backlight.pwm_level_min);
+
+ return scale(val, panel->backlight.pwm_level_min, panel->backlight.pwm_level_max,
+ panel->backlight.min, panel->backlight.max);
+}
+
+static u32 lpt_get_backlight(struct intel_connector *connector, enum pipe unused)
+{
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+
+ return intel_de_read(dev_priv, BLC_PWM_PCH_CTL2) & BACKLIGHT_DUTY_CYCLE_MASK;
+}
+
+static u32 pch_get_backlight(struct intel_connector *connector, enum pipe unused)
+{
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+
+ return intel_de_read(dev_priv, BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
+}
+
+static u32 i9xx_get_backlight(struct intel_connector *connector, enum pipe unused)
+{
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ struct intel_panel *panel = &connector->panel;
+ u32 val;
+
+ val = intel_de_read(dev_priv, BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
+ if (DISPLAY_VER(dev_priv) < 4)
+ val >>= 1;
+
+ if (panel->backlight.combination_mode) {
+ u8 lbpc;
+
+ pci_read_config_byte(to_pci_dev(dev_priv->drm.dev), LBPC, &lbpc);
+ val *= lbpc;
+ }
+
+ return val;
+}
+
+static u32 vlv_get_backlight(struct intel_connector *connector, enum pipe pipe)
+{
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+
+ if (drm_WARN_ON(&dev_priv->drm, pipe != PIPE_A && pipe != PIPE_B))
+ return 0;
+
+ return intel_de_read(dev_priv, VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK;
+}
+
+static u32 bxt_get_backlight(struct intel_connector *connector, enum pipe unused)
+{
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ struct intel_panel *panel = &connector->panel;
+
+ return intel_de_read(dev_priv,
+ BXT_BLC_PWM_DUTY(panel->backlight.controller));
+}
+
+static u32 ext_pwm_get_backlight(struct intel_connector *connector, enum pipe unused)
+{
+ struct intel_panel *panel = &connector->panel;
+ struct pwm_state state;
+
+ pwm_get_state(panel->backlight.pwm, &state);
+ return pwm_get_relative_duty_cycle(&state, 100);
+}
+
+static void lpt_set_backlight(const struct drm_connector_state *conn_state, u32 level)
+{
+ struct intel_connector *connector = to_intel_connector(conn_state->connector);
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+
+ u32 val = intel_de_read(dev_priv, BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK;
+ intel_de_write(dev_priv, BLC_PWM_PCH_CTL2, val | level);
+}
+
+static void pch_set_backlight(const struct drm_connector_state *conn_state, u32 level)
+{
+ struct intel_connector *connector = to_intel_connector(conn_state->connector);
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ u32 tmp;
+
+ tmp = intel_de_read(dev_priv, BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
+ intel_de_write(dev_priv, BLC_PWM_CPU_CTL, tmp | level);
+}
+
+static void i9xx_set_backlight(const struct drm_connector_state *conn_state, u32 level)
+{
+ struct intel_connector *connector = to_intel_connector(conn_state->connector);
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ struct intel_panel *panel = &connector->panel;
+ u32 tmp, mask;
+
+ drm_WARN_ON(&dev_priv->drm, panel->backlight.pwm_level_max == 0);
+
+ if (panel->backlight.combination_mode) {
+ u8 lbpc;
+
+ lbpc = level * 0xfe / panel->backlight.pwm_level_max + 1;
+ level /= lbpc;
+ pci_write_config_byte(to_pci_dev(dev_priv->drm.dev), LBPC, lbpc);
+ }
+
+ if (DISPLAY_VER(dev_priv) == 4) {
+ mask = BACKLIGHT_DUTY_CYCLE_MASK;
+ } else {
+ level <<= 1;
+ mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV;
+ }
+
+ tmp = intel_de_read(dev_priv, BLC_PWM_CTL) & ~mask;
+ intel_de_write(dev_priv, BLC_PWM_CTL, tmp | level);
+}
+
+static void vlv_set_backlight(const struct drm_connector_state *conn_state, u32 level)
+{
+ struct intel_connector *connector = to_intel_connector(conn_state->connector);
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ enum pipe pipe = to_intel_crtc(conn_state->crtc)->pipe;
+ u32 tmp;
+
+ tmp = intel_de_read(dev_priv, VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
+ intel_de_write(dev_priv, VLV_BLC_PWM_CTL(pipe), tmp | level);
+}
+
+static void bxt_set_backlight(const struct drm_connector_state *conn_state, u32 level)
+{
+ struct intel_connector *connector = to_intel_connector(conn_state->connector);
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ struct intel_panel *panel = &connector->panel;
+
+ intel_de_write(dev_priv,
+ BXT_BLC_PWM_DUTY(panel->backlight.controller), level);
+}
+
+static void ext_pwm_set_backlight(const struct drm_connector_state *conn_state, u32 level)
+{
+ struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel;
+
+ pwm_set_relative_duty_cycle(&panel->backlight.pwm_state, level, 100);
+ pwm_apply_state(panel->backlight.pwm, &panel->backlight.pwm_state);
+}
+
+static void
+intel_panel_actually_set_backlight(const struct drm_connector_state *conn_state, u32 level)
+{
+ struct intel_connector *connector = to_intel_connector(conn_state->connector);
+ struct drm_i915_private *i915 = to_i915(connector->base.dev);
+ struct intel_panel *panel = &connector->panel;
+
+ drm_dbg_kms(&i915->drm, "set backlight level = %d\n", level);
+
+ panel->backlight.funcs->set(conn_state, level);
+}
+
+/* set backlight brightness to level in range [0..max], assuming hw min is
+ * respected.
+ */
+void intel_panel_set_backlight_acpi(const struct drm_connector_state *conn_state,
+ u32 user_level, u32 user_max)
+{
+ struct intel_connector *connector = to_intel_connector(conn_state->connector);
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ struct intel_panel *panel = &connector->panel;
+ u32 hw_level;
+
+ /*
+ * Lack of crtc may occur during driver init because
+ * connection_mutex isn't held across the entire backlight
+ * setup + modeset readout, and the BIOS can issue the
+ * requests at any time.
+ */
+ if (!panel->backlight.present || !conn_state->crtc)
+ return;
+
+ mutex_lock(&dev_priv->backlight_lock);
+
+ drm_WARN_ON(&dev_priv->drm, panel->backlight.max == 0);
+
+ hw_level = clamp_user_to_hw(connector, user_level, user_max);
+ panel->backlight.level = hw_level;
+
+ if (panel->backlight.device)
+ panel->backlight.device->props.brightness =
+ scale_hw_to_user(connector,
+ panel->backlight.level,
+ panel->backlight.device->props.max_brightness);
+
+ if (panel->backlight.enabled)
+ intel_panel_actually_set_backlight(conn_state, hw_level);
+
+ mutex_unlock(&dev_priv->backlight_lock);
+}
+
+static void lpt_disable_backlight(const struct drm_connector_state *old_conn_state, u32 level)
+{
+ struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ u32 tmp;
+
+ intel_panel_set_pwm_level(old_conn_state, level);
+
+ /*
+ * Although we don't support or enable CPU PWM with LPT/SPT based
+ * systems, it may have been enabled prior to loading the
+ * driver. Disable to avoid warnings on LCPLL disable.
+ *
+ * This needs rework if we need to add support for CPU PWM on PCH split
+ * platforms.
+ */
+ tmp = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2);
+ if (tmp & BLM_PWM_ENABLE) {
+ drm_dbg_kms(&dev_priv->drm,
+ "cpu backlight was enabled, disabling\n");
+ intel_de_write(dev_priv, BLC_PWM_CPU_CTL2,
+ tmp & ~BLM_PWM_ENABLE);
+ }
+
+ tmp = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
+ intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
+}
+
+static void pch_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
+{
+ struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ u32 tmp;
+
+ intel_panel_set_pwm_level(old_conn_state, val);
+
+ tmp = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2);
+ intel_de_write(dev_priv, BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
+
+ tmp = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
+ intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
+}
+
+static void i9xx_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
+{
+ intel_panel_set_pwm_level(old_conn_state, val);
+}
+
+static void i965_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
+{
+ struct drm_i915_private *dev_priv = to_i915(old_conn_state->connector->dev);
+ u32 tmp;
+
+ intel_panel_set_pwm_level(old_conn_state, val);
+
+ tmp = intel_de_read(dev_priv, BLC_PWM_CTL2);
+ intel_de_write(dev_priv, BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE);
+}
+
+static void vlv_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
+{
+ struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ enum pipe pipe = to_intel_crtc(old_conn_state->crtc)->pipe;
+ u32 tmp;
+
+ intel_panel_set_pwm_level(old_conn_state, val);
+
+ tmp = intel_de_read(dev_priv, VLV_BLC_PWM_CTL2(pipe));
+ intel_de_write(dev_priv, VLV_BLC_PWM_CTL2(pipe),
+ tmp & ~BLM_PWM_ENABLE);
+}
+
+static void bxt_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
+{
+ struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ struct intel_panel *panel = &connector->panel;
+ u32 tmp;
+
+ intel_panel_set_pwm_level(old_conn_state, val);
+
+ tmp = intel_de_read(dev_priv,
+ BXT_BLC_PWM_CTL(panel->backlight.controller));
+ intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
+ tmp & ~BXT_BLC_PWM_ENABLE);
+
+ if (panel->backlight.controller == 1) {
+ val = intel_de_read(dev_priv, UTIL_PIN_CTL);
+ val &= ~UTIL_PIN_ENABLE;
+ intel_de_write(dev_priv, UTIL_PIN_CTL, val);
+ }
+}
+
+static void cnp_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
+{
+ struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ struct intel_panel *panel = &connector->panel;
+ u32 tmp;
+
+ intel_panel_set_pwm_level(old_conn_state, val);
+
+ tmp = intel_de_read(dev_priv,
+ BXT_BLC_PWM_CTL(panel->backlight.controller));
+ intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
+ tmp & ~BXT_BLC_PWM_ENABLE);
+}
+
+static void ext_pwm_disable_backlight(const struct drm_connector_state *old_conn_state, u32 level)
+{
+ struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
+ struct intel_panel *panel = &connector->panel;
+
+ panel->backlight.pwm_state.enabled = false;
+ pwm_apply_state(panel->backlight.pwm, &panel->backlight.pwm_state);
+}
+
+void intel_panel_disable_backlight(const struct drm_connector_state *old_conn_state)
+{
+ struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ struct intel_panel *panel = &connector->panel;
+
+ if (!panel->backlight.present)
+ return;
+
+ /*
+ * Do not disable backlight on the vga_switcheroo path. When switching
+ * away from i915, the other client may depend on i915 to handle the
+ * backlight. This will leave the backlight on unnecessarily when
+ * another client is not activated.
+ */
+ if (dev_priv->drm.switch_power_state == DRM_SWITCH_POWER_CHANGING) {
+ drm_dbg_kms(&dev_priv->drm,
+ "Skipping backlight disable on vga switch\n");
+ return;
+ }
+
+ mutex_lock(&dev_priv->backlight_lock);
+
+ if (panel->backlight.device)
+ panel->backlight.device->props.power = FB_BLANK_POWERDOWN;
+ panel->backlight.enabled = false;
+ panel->backlight.funcs->disable(old_conn_state, 0);
+
+ mutex_unlock(&dev_priv->backlight_lock);
+}
+
+static void lpt_enable_backlight(const struct intel_crtc_state *crtc_state,
+ const struct drm_connector_state *conn_state, u32 level)
+{
+ struct intel_connector *connector = to_intel_connector(conn_state->connector);
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ struct intel_panel *panel = &connector->panel;
+ u32 pch_ctl1, pch_ctl2, schicken;
+
+ pch_ctl1 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
+ if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
+ drm_dbg_kms(&dev_priv->drm, "pch backlight already enabled\n");
+ pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
+ intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, pch_ctl1);
+ }
+
+ if (HAS_PCH_LPT(dev_priv)) {
+ schicken = intel_de_read(dev_priv, SOUTH_CHICKEN2);
+ if (panel->backlight.alternate_pwm_increment)
+ schicken |= LPT_PWM_GRANULARITY;
+ else
+ schicken &= ~LPT_PWM_GRANULARITY;
+ intel_de_write(dev_priv, SOUTH_CHICKEN2, schicken);
+ } else {
+ schicken = intel_de_read(dev_priv, SOUTH_CHICKEN1);
+ if (panel->backlight.alternate_pwm_increment)
+ schicken |= SPT_PWM_GRANULARITY;
+ else
+ schicken &= ~SPT_PWM_GRANULARITY;
+ intel_de_write(dev_priv, SOUTH_CHICKEN1, schicken);
+ }
+
+ pch_ctl2 = panel->backlight.pwm_level_max << 16;
+ intel_de_write(dev_priv, BLC_PWM_PCH_CTL2, pch_ctl2);
+
+ pch_ctl1 = 0;
+ if (panel->backlight.active_low_pwm)
+ pch_ctl1 |= BLM_PCH_POLARITY;
+
+ /* After LPT, override is the default. */
+ if (HAS_PCH_LPT(dev_priv))
+ pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE;
+
+ intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, pch_ctl1);
+ intel_de_posting_read(dev_priv, BLC_PWM_PCH_CTL1);
+ intel_de_write(dev_priv, BLC_PWM_PCH_CTL1,
+ pch_ctl1 | BLM_PCH_PWM_ENABLE);
+
+ /* This won't stick until the above enable. */
+ intel_panel_set_pwm_level(conn_state, level);
+}
+
+static void pch_enable_backlight(const struct intel_crtc_state *crtc_state,
+ const struct drm_connector_state *conn_state, u32 level)
+{
+ struct intel_connector *connector = to_intel_connector(conn_state->connector);
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ struct intel_panel *panel = &connector->panel;
+ enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
+ u32 cpu_ctl2, pch_ctl1, pch_ctl2;
+
+ cpu_ctl2 = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2);
+ if (cpu_ctl2 & BLM_PWM_ENABLE) {
+ drm_dbg_kms(&dev_priv->drm, "cpu backlight already enabled\n");
+ cpu_ctl2 &= ~BLM_PWM_ENABLE;
+ intel_de_write(dev_priv, BLC_PWM_CPU_CTL2, cpu_ctl2);
+ }
+
+ pch_ctl1 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
+ if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
+ drm_dbg_kms(&dev_priv->drm, "pch backlight already enabled\n");
+ pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
+ intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, pch_ctl1);
+ }
+
+ if (cpu_transcoder == TRANSCODER_EDP)
+ cpu_ctl2 = BLM_TRANSCODER_EDP;
+ else
+ cpu_ctl2 = BLM_PIPE(cpu_transcoder);
+ intel_de_write(dev_priv, BLC_PWM_CPU_CTL2, cpu_ctl2);
+ intel_de_posting_read(dev_priv, BLC_PWM_CPU_CTL2);
+ intel_de_write(dev_priv, BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);
+
+ /* This won't stick until the above enable. */
+ intel_panel_set_pwm_level(conn_state, level);
+
+ pch_ctl2 = panel->backlight.pwm_level_max << 16;
+ intel_de_write(dev_priv, BLC_PWM_PCH_CTL2, pch_ctl2);
+
+ pch_ctl1 = 0;
+ if (panel->backlight.active_low_pwm)
+ pch_ctl1 |= BLM_PCH_POLARITY;
+
+ intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, pch_ctl1);
+ intel_de_posting_read(dev_priv, BLC_PWM_PCH_CTL1);
+ intel_de_write(dev_priv, BLC_PWM_PCH_CTL1,
+ pch_ctl1 | BLM_PCH_PWM_ENABLE);
+}
+
+static void i9xx_enable_backlight(const struct intel_crtc_state *crtc_state,
+ const struct drm_connector_state *conn_state, u32 level)
+{
+ struct intel_connector *connector = to_intel_connector(conn_state->connector);
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ struct intel_panel *panel = &connector->panel;
+ u32 ctl, freq;
+
+ ctl = intel_de_read(dev_priv, BLC_PWM_CTL);
+ if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {
+ drm_dbg_kms(&dev_priv->drm, "backlight already enabled\n");
+ intel_de_write(dev_priv, BLC_PWM_CTL, 0);
+ }
+
+ freq = panel->backlight.pwm_level_max;
+ if (panel->backlight.combination_mode)
+ freq /= 0xff;
+
+ ctl = freq << 17;
+ if (panel->backlight.combination_mode)
+ ctl |= BLM_LEGACY_MODE;
+ if (IS_PINEVIEW(dev_priv) && panel->backlight.active_low_pwm)
+ ctl |= BLM_POLARITY_PNV;
+
+ intel_de_write(dev_priv, BLC_PWM_CTL, ctl);
+ intel_de_posting_read(dev_priv, BLC_PWM_CTL);
+
+ /* XXX: combine this into above write? */
+ intel_panel_set_pwm_level(conn_state, level);
+
+ /*
+ * Needed to enable backlight on some 855gm models. BLC_HIST_CTL is
+ * 855gm only, but checking for gen2 is safe, as 855gm is the only gen2
+ * that has backlight.
+ */
+ if (DISPLAY_VER(dev_priv) == 2)
+ intel_de_write(dev_priv, BLC_HIST_CTL, BLM_HISTOGRAM_ENABLE);
+}
+
+static void i965_enable_backlight(const struct intel_crtc_state *crtc_state,
+ const struct drm_connector_state *conn_state, u32 level)
+{
+ struct intel_connector *connector = to_intel_connector(conn_state->connector);
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ struct intel_panel *panel = &connector->panel;
+ enum pipe pipe = to_intel_crtc(conn_state->crtc)->pipe;
+ u32 ctl, ctl2, freq;
+
+ ctl2 = intel_de_read(dev_priv, BLC_PWM_CTL2);
+ if (ctl2 & BLM_PWM_ENABLE) {
+ drm_dbg_kms(&dev_priv->drm, "backlight already enabled\n");
+ ctl2 &= ~BLM_PWM_ENABLE;
+ intel_de_write(dev_priv, BLC_PWM_CTL2, ctl2);
+ }
+
+ freq = panel->backlight.pwm_level_max;
+ if (panel->backlight.combination_mode)
+ freq /= 0xff;
+
+ ctl = freq << 16;
+ intel_de_write(dev_priv, BLC_PWM_CTL, ctl);
+
+ ctl2 = BLM_PIPE(pipe);
+ if (panel->backlight.combination_mode)
+ ctl2 |= BLM_COMBINATION_MODE;
+ if (panel->backlight.active_low_pwm)
+ ctl2 |= BLM_POLARITY_I965;
+ intel_de_write(dev_priv, BLC_PWM_CTL2, ctl2);
+ intel_de_posting_read(dev_priv, BLC_PWM_CTL2);
+ intel_de_write(dev_priv, BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
+
+ intel_panel_set_pwm_level(conn_state, level);
+}
+
+static void vlv_enable_backlight(const struct intel_crtc_state *crtc_state,
+ const struct drm_connector_state *conn_state, u32 level)
+{
+ struct intel_connector *connector = to_intel_connector(conn_state->connector);
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ struct intel_panel *panel = &connector->panel;
+ enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
+ u32 ctl, ctl2;
+
+ ctl2 = intel_de_read(dev_priv, VLV_BLC_PWM_CTL2(pipe));
+ if (ctl2 & BLM_PWM_ENABLE) {
+ drm_dbg_kms(&dev_priv->drm, "backlight already enabled\n");
+ ctl2 &= ~BLM_PWM_ENABLE;
+ intel_de_write(dev_priv, VLV_BLC_PWM_CTL2(pipe), ctl2);
+ }
+
+ ctl = panel->backlight.pwm_level_max << 16;
+ intel_de_write(dev_priv, VLV_BLC_PWM_CTL(pipe), ctl);
+
+ /* XXX: combine this into above write? */
+ intel_panel_set_pwm_level(conn_state, level);
+
+ ctl2 = 0;
+ if (panel->backlight.active_low_pwm)
+ ctl2 |= BLM_POLARITY_I965;
+ intel_de_write(dev_priv, VLV_BLC_PWM_CTL2(pipe), ctl2);
+ intel_de_posting_read(dev_priv, VLV_BLC_PWM_CTL2(pipe));
+ intel_de_write(dev_priv, VLV_BLC_PWM_CTL2(pipe),
+ ctl2 | BLM_PWM_ENABLE);
+}
+
+static void bxt_enable_backlight(const struct intel_crtc_state *crtc_state,
+ const struct drm_connector_state *conn_state, u32 level)
+{
+ struct intel_connector *connector = to_intel_connector(conn_state->connector);
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ struct intel_panel *panel = &connector->panel;
+ enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
+ u32 pwm_ctl, val;
+
+ /* Controller 1 uses the utility pin. */
+ if (panel->backlight.controller == 1) {
+ val = intel_de_read(dev_priv, UTIL_PIN_CTL);
+ if (val & UTIL_PIN_ENABLE) {
+ drm_dbg_kms(&dev_priv->drm,
+ "util pin already enabled\n");
+ val &= ~UTIL_PIN_ENABLE;
+ intel_de_write(dev_priv, UTIL_PIN_CTL, val);
+ }
+
+ val = 0;
+ if (panel->backlight.util_pin_active_low)
+ val |= UTIL_PIN_POLARITY;
+ intel_de_write(dev_priv, UTIL_PIN_CTL,
+ val | UTIL_PIN_PIPE(pipe) | UTIL_PIN_MODE_PWM | UTIL_PIN_ENABLE);
+ }
+
+ pwm_ctl = intel_de_read(dev_priv,
+ BXT_BLC_PWM_CTL(panel->backlight.controller));
+ if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
+ drm_dbg_kms(&dev_priv->drm, "backlight already enabled\n");
+ pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
+ intel_de_write(dev_priv,
+ BXT_BLC_PWM_CTL(panel->backlight.controller),
+ pwm_ctl);
+ }
+
+ intel_de_write(dev_priv,
+ BXT_BLC_PWM_FREQ(panel->backlight.controller),
+ panel->backlight.pwm_level_max);
+
+ intel_panel_set_pwm_level(conn_state, level);
+
+ pwm_ctl = 0;
+ if (panel->backlight.active_low_pwm)
+ pwm_ctl |= BXT_BLC_PWM_POLARITY;
+
+ intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
+ pwm_ctl);
+ intel_de_posting_read(dev_priv,
+ BXT_BLC_PWM_CTL(panel->backlight.controller));
+ intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
+ pwm_ctl | BXT_BLC_PWM_ENABLE);
+}
+
+static void cnp_enable_backlight(const struct intel_crtc_state *crtc_state,
+ const struct drm_connector_state *conn_state, u32 level)
+{
+ struct intel_connector *connector = to_intel_connector(conn_state->connector);
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ struct intel_panel *panel = &connector->panel;
+ u32 pwm_ctl;
+
+ pwm_ctl = intel_de_read(dev_priv,
+ BXT_BLC_PWM_CTL(panel->backlight.controller));
+ if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
+ drm_dbg_kms(&dev_priv->drm, "backlight already enabled\n");
+ pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
+ intel_de_write(dev_priv,
+ BXT_BLC_PWM_CTL(panel->backlight.controller),
+ pwm_ctl);
+ }
+
+ intel_de_write(dev_priv,
+ BXT_BLC_PWM_FREQ(panel->backlight.controller),
+ panel->backlight.pwm_level_max);
+
+ intel_panel_set_pwm_level(conn_state, level);
+
+ pwm_ctl = 0;
+ if (panel->backlight.active_low_pwm)
+ pwm_ctl |= BXT_BLC_PWM_POLARITY;
+
+ intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
+ pwm_ctl);
+ intel_de_posting_read(dev_priv,
+ BXT_BLC_PWM_CTL(panel->backlight.controller));
+ intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
+ pwm_ctl | BXT_BLC_PWM_ENABLE);
+}
+
+static void ext_pwm_enable_backlight(const struct intel_crtc_state *crtc_state,
+ const struct drm_connector_state *conn_state, u32 level)
+{
+ struct intel_connector *connector = to_intel_connector(conn_state->connector);
+ struct intel_panel *panel = &connector->panel;
+
+ pwm_set_relative_duty_cycle(&panel->backlight.pwm_state, level, 100);
+ panel->backlight.pwm_state.enabled = true;
+ pwm_apply_state(panel->backlight.pwm, &panel->backlight.pwm_state);
+}
+
+static void __intel_panel_enable_backlight(const struct intel_crtc_state *crtc_state,
+ const struct drm_connector_state *conn_state)
+{
+ struct intel_connector *connector = to_intel_connector(conn_state->connector);
+ struct intel_panel *panel = &connector->panel;
+
+ WARN_ON(panel->backlight.max == 0);
+
+ if (panel->backlight.level <= panel->backlight.min) {
+ panel->backlight.level = panel->backlight.max;
+ if (panel->backlight.device)
+ panel->backlight.device->props.brightness =
+ scale_hw_to_user(connector,
+ panel->backlight.level,
+ panel->backlight.device->props.max_brightness);
+ }
+
+ panel->backlight.funcs->enable(crtc_state, conn_state, panel->backlight.level);
+ panel->backlight.enabled = true;
+ if (panel->backlight.device)
+ panel->backlight.device->props.power = FB_BLANK_UNBLANK;
+}
+
+void intel_panel_enable_backlight(const struct intel_crtc_state *crtc_state,
+ const struct drm_connector_state *conn_state)
+{
+ struct intel_connector *connector = to_intel_connector(conn_state->connector);
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ struct intel_panel *panel = &connector->panel;
+ enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
+
+ if (!panel->backlight.present)
+ return;
+
+ drm_dbg_kms(&dev_priv->drm, "pipe %c\n", pipe_name(pipe));
+
+ mutex_lock(&dev_priv->backlight_lock);
+
+ __intel_panel_enable_backlight(crtc_state, conn_state);
+
+ mutex_unlock(&dev_priv->backlight_lock);
+}
+
+#if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
+static u32 intel_panel_get_backlight(struct intel_connector *connector)
+{
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ struct intel_panel *panel = &connector->panel;
+ u32 val = 0;
+
+ mutex_lock(&dev_priv->backlight_lock);
+
+ if (panel->backlight.enabled)
+ val = panel->backlight.funcs->get(connector, intel_connector_get_pipe(connector));
+
+ mutex_unlock(&dev_priv->backlight_lock);
+
+ drm_dbg_kms(&dev_priv->drm, "get backlight PWM = %d\n", val);
+ return val;
+}
+
+/* Scale user_level in range [0..user_max] to [hw_min..hw_max]. */
+static u32 scale_user_to_hw(struct intel_connector *connector,
+ u32 user_level, u32 user_max)
+{
+ struct intel_panel *panel = &connector->panel;
+
+ return scale(user_level, 0, user_max,
+ panel->backlight.min, panel->backlight.max);
+}
+
+/* set backlight brightness to level in range [0..max], scaling wrt hw min */
+static void intel_panel_set_backlight(const struct drm_connector_state *conn_state,
+ u32 user_level, u32 user_max)
+{
+ struct intel_connector *connector = to_intel_connector(conn_state->connector);
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ struct intel_panel *panel = &connector->panel;
+ u32 hw_level;
+
+ if (!panel->backlight.present)
+ return;
+
+ mutex_lock(&dev_priv->backlight_lock);
+
+ drm_WARN_ON(&dev_priv->drm, panel->backlight.max == 0);
+
+ hw_level = scale_user_to_hw(connector, user_level, user_max);
+ panel->backlight.level = hw_level;
+
+ if (panel->backlight.enabled)
+ intel_panel_actually_set_backlight(conn_state, hw_level);
+
+ mutex_unlock(&dev_priv->backlight_lock);
+}
+
+static int intel_backlight_device_update_status(struct backlight_device *bd)
+{
+ struct intel_connector *connector = bl_get_data(bd);
+ struct intel_panel *panel = &connector->panel;
+ struct drm_device *dev = connector->base.dev;
+
+ drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
+ DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
+ bd->props.brightness, bd->props.max_brightness);
+ intel_panel_set_backlight(connector->base.state, bd->props.brightness,
+ bd->props.max_brightness);
+
+ /*
+ * Allow flipping bl_power as a sub-state of enabled. Sadly the
+ * backlight class device does not make it easy to differentiate
+ * between callbacks for brightness and bl_power, so our backlight_power
+ * callback needs to take this into account.
+ */
+ if (panel->backlight.enabled) {
+ if (panel->backlight.power) {
+ bool enable = bd->props.power == FB_BLANK_UNBLANK &&
+ bd->props.brightness != 0;
+ panel->backlight.power(connector, enable);
+ }
+ } else {
+ bd->props.power = FB_BLANK_POWERDOWN;
+ }
+
+ drm_modeset_unlock(&dev->mode_config.connection_mutex);
+ return 0;
+}
+
+static int intel_backlight_device_get_brightness(struct backlight_device *bd)
+{
+ struct intel_connector *connector = bl_get_data(bd);
+ struct drm_device *dev = connector->base.dev;
+ struct drm_i915_private *dev_priv = to_i915(dev);
+ intel_wakeref_t wakeref;
+ int ret = 0;
+
+ with_intel_runtime_pm(&dev_priv->runtime_pm, wakeref) {
+ u32 hw_level;
+
+ drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
+
+ hw_level = intel_panel_get_backlight(connector);
+ ret = scale_hw_to_user(connector,
+ hw_level, bd->props.max_brightness);
+
+ drm_modeset_unlock(&dev->mode_config.connection_mutex);
+ }
+
+ return ret;
+}
+
+static const struct backlight_ops intel_backlight_device_ops = {
+ .update_status = intel_backlight_device_update_status,
+ .get_brightness = intel_backlight_device_get_brightness,
+};
+
+int intel_backlight_device_register(struct intel_connector *connector)
+{
+ struct drm_i915_private *i915 = to_i915(connector->base.dev);
+ struct intel_panel *panel = &connector->panel;
+ struct backlight_properties props;
+ struct backlight_device *bd;
+ const char *name;
+ int ret = 0;
+
+ if (WARN_ON(panel->backlight.device))
+ return -ENODEV;
+
+ if (!panel->backlight.present)
+ return 0;
+
+ WARN_ON(panel->backlight.max == 0);
+
+ memset(&props, 0, sizeof(props));
+ props.type = BACKLIGHT_RAW;
+
+ /*
+ * Note: Everything should work even if the backlight device max
+ * presented to the userspace is arbitrarily chosen.
+ */
+ props.max_brightness = panel->backlight.max;
+ props.brightness = scale_hw_to_user(connector,
+ panel->backlight.level,
+ props.max_brightness);
+
+ if (panel->backlight.enabled)
+ props.power = FB_BLANK_UNBLANK;
+ else
+ props.power = FB_BLANK_POWERDOWN;
+
+ name = kstrdup("intel_backlight", GFP_KERNEL);
+ if (!name)
+ return -ENOMEM;
+
+ bd = backlight_device_register(name, connector->base.kdev, connector,
+ &intel_backlight_device_ops, &props);
+
+ /*
+ * Using the same name independent of the drm device or connector
+ * prevents registration of multiple backlight devices in the
+ * driver. However, we need to use the default name for backward
+ * compatibility. Use unique names for subsequent backlight devices as a
+ * fallback when the default name already exists.
+ */
+ if (IS_ERR(bd) && PTR_ERR(bd) == -EEXIST) {
+ kfree(name);
+ name = kasprintf(GFP_KERNEL, "card%d-%s-backlight",
+ i915->drm.primary->index, connector->base.name);
+ if (!name)
+ return -ENOMEM;
+
+ bd = backlight_device_register(name, connector->base.kdev, connector,
+ &intel_backlight_device_ops, &props);
+ }
+
+ if (IS_ERR(bd)) {
+ drm_err(&i915->drm,
+ "[CONNECTOR:%d:%s] backlight device %s register failed: %ld\n",
+ connector->base.base.id, connector->base.name, name, PTR_ERR(bd));
+ ret = PTR_ERR(bd);
+ goto out;
+ }
+
+ panel->backlight.device = bd;
+
+ drm_dbg_kms(&i915->drm,
+ "[CONNECTOR:%d:%s] backlight device %s registered\n",
+ connector->base.base.id, connector->base.name, name);
+
+out:
+ kfree(name);
+
+ return ret;
+}
+
+void intel_backlight_device_unregister(struct intel_connector *connector)
+{
+ struct intel_panel *panel = &connector->panel;
+
+ if (panel->backlight.device) {
+ backlight_device_unregister(panel->backlight.device);
+ panel->backlight.device = NULL;
+ }
+}
+#endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
+
+/*
+ * CNP: PWM clock frequency is 19.2 MHz or 24 MHz.
+ * PWM increment = 1
+ */
+static u32 cnp_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
+{
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+
+ return DIV_ROUND_CLOSEST(KHz(RUNTIME_INFO(dev_priv)->rawclk_freq),
+ pwm_freq_hz);
+}
+
+/*
+ * BXT: PWM clock frequency = 19.2 MHz.
+ */
+static u32 bxt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
+{
+ return DIV_ROUND_CLOSEST(KHz(19200), pwm_freq_hz);
+}
+
+/*
+ * SPT: This value represents the period of the PWM stream in clock periods
+ * multiplied by 16 (default increment) or 128 (alternate increment selected in
+ * SCHICKEN_1 bit 0). PWM clock is 24 MHz.
+ */
+static u32 spt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
+{
+ struct intel_panel *panel = &connector->panel;
+ u32 mul;
+
+ if (panel->backlight.alternate_pwm_increment)
+ mul = 128;
+ else
+ mul = 16;
+
+ return DIV_ROUND_CLOSEST(MHz(24), pwm_freq_hz * mul);
+}
+
+/*
+ * LPT: This value represents the period of the PWM stream in clock periods
+ * multiplied by 128 (default increment) or 16 (alternate increment, selected in
+ * LPT SOUTH_CHICKEN2 register bit 5).
+ */
+static u32 lpt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
+{
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ struct intel_panel *panel = &connector->panel;
+ u32 mul, clock;
+
+ if (panel->backlight.alternate_pwm_increment)
+ mul = 16;
+ else
+ mul = 128;
+
+ if (HAS_PCH_LPT_H(dev_priv))
+ clock = MHz(135); /* LPT:H */
+ else
+ clock = MHz(24); /* LPT:LP */
+
+ return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul);
+}
+
+/*
+ * ILK/SNB/IVB: This value represents the period of the PWM stream in PCH
+ * display raw clocks multiplied by 128.
+ */
+static u32 pch_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
+{
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+
+ return DIV_ROUND_CLOSEST(KHz(RUNTIME_INFO(dev_priv)->rawclk_freq),
+ pwm_freq_hz * 128);
+}
+
+/*
+ * Gen2: This field determines the number of time base events (display core
+ * clock frequency/32) in total for a complete cycle of modulated backlight
+ * control.
+ *
+ * Gen3: A time base event equals the display core clock ([DevPNV] HRAW clock)
+ * divided by 32.
+ */
+static u32 i9xx_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
+{
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ int clock;
+
+ if (IS_PINEVIEW(dev_priv))
+ clock = KHz(RUNTIME_INFO(dev_priv)->rawclk_freq);
+ else
+ clock = KHz(dev_priv->cdclk.hw.cdclk);
+
+ return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 32);
+}
+
+/*
+ * Gen4: This value represents the period of the PWM stream in display core
+ * clocks ([DevCTG] HRAW clocks) multiplied by 128.
+ *
+ */
+static u32 i965_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
+{
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ int clock;
+
+ if (IS_G4X(dev_priv))
+ clock = KHz(RUNTIME_INFO(dev_priv)->rawclk_freq);
+ else
+ clock = KHz(dev_priv->cdclk.hw.cdclk);
+
+ return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 128);
+}
+
+/*
+ * VLV: This value represents the period of the PWM stream in display core
+ * clocks ([DevCTG] 200MHz HRAW clocks) multiplied by 128 or 25MHz S0IX clocks
+ * multiplied by 16. CHV uses a 19.2MHz S0IX clock.
+ */
+static u32 vlv_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
+{
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ int mul, clock;
+
+ if ((intel_de_read(dev_priv, CBR1_VLV) & CBR_PWM_CLOCK_MUX_SELECT) == 0) {
+ if (IS_CHERRYVIEW(dev_priv))
+ clock = KHz(19200);
+ else
+ clock = MHz(25);
+ mul = 16;
+ } else {
+ clock = KHz(RUNTIME_INFO(dev_priv)->rawclk_freq);
+ mul = 128;
+ }
+
+ return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul);
+}
+
+static u16 get_vbt_pwm_freq(struct drm_i915_private *dev_priv)
+{
+ u16 pwm_freq_hz = dev_priv->vbt.backlight.pwm_freq_hz;
+
+ if (pwm_freq_hz) {
+ drm_dbg_kms(&dev_priv->drm,
+ "VBT defined backlight frequency %u Hz\n",
+ pwm_freq_hz);
+ } else {
+ pwm_freq_hz = 200;
+ drm_dbg_kms(&dev_priv->drm,
+ "default backlight frequency %u Hz\n",
+ pwm_freq_hz);
+ }
+
+ return pwm_freq_hz;
+}
+
+static u32 get_backlight_max_vbt(struct intel_connector *connector)
+{
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ struct intel_panel *panel = &connector->panel;
+ u16 pwm_freq_hz = get_vbt_pwm_freq(dev_priv);
+ u32 pwm;
+
+ if (!panel->backlight.pwm_funcs->hz_to_pwm) {
+ drm_dbg_kms(&dev_priv->drm,
+ "backlight frequency conversion not supported\n");
+ return 0;
+ }
+
+ pwm = panel->backlight.pwm_funcs->hz_to_pwm(connector, pwm_freq_hz);
+ if (!pwm) {
+ drm_dbg_kms(&dev_priv->drm,
+ "backlight frequency conversion failed\n");
+ return 0;
+ }
+
+ return pwm;
+}
+
+/*
+ * Note: The setup hooks can't assume pipe is set!
+ */
+static u32 get_backlight_min_vbt(struct intel_connector *connector)
+{
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ struct intel_panel *panel = &connector->panel;
+ int min;
+
+ drm_WARN_ON(&dev_priv->drm, panel->backlight.pwm_level_max == 0);
+
+ /*
+ * XXX: If the vbt value is 255, it makes min equal to max, which leads
+ * to problems. There are such machines out there. Either our
+ * interpretation is wrong or the vbt has bogus data. Or both. Safeguard
+ * against this by letting the minimum be at most (arbitrarily chosen)
+ * 25% of the max.
+ */
+ min = clamp_t(int, dev_priv->vbt.backlight.min_brightness, 0, 64);
+ if (min != dev_priv->vbt.backlight.min_brightness) {
+ drm_dbg_kms(&dev_priv->drm,
+ "clamping VBT min backlight %d/255 to %d/255\n",
+ dev_priv->vbt.backlight.min_brightness, min);
+ }
+
+ /* vbt value is a coefficient in range [0..255] */
+ return scale(min, 0, 255, 0, panel->backlight.pwm_level_max);
+}
+
+static int lpt_setup_backlight(struct intel_connector *connector, enum pipe unused)
+{
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ struct intel_panel *panel = &connector->panel;
+ u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
+ bool alt, cpu_mode;
+
+ if (HAS_PCH_LPT(dev_priv))
+ alt = intel_de_read(dev_priv, SOUTH_CHICKEN2) & LPT_PWM_GRANULARITY;
+ else
+ alt = intel_de_read(dev_priv, SOUTH_CHICKEN1) & SPT_PWM_GRANULARITY;
+ panel->backlight.alternate_pwm_increment = alt;
+
+ pch_ctl1 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
+ panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
+
+ pch_ctl2 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL2);
+ panel->backlight.pwm_level_max = pch_ctl2 >> 16;
+
+ cpu_ctl2 = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2);
+
+ if (!panel->backlight.pwm_level_max)
+ panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
+
+ if (!panel->backlight.pwm_level_max)
+ return -ENODEV;
+
+ panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
+
+ panel->backlight.pwm_enabled = pch_ctl1 & BLM_PCH_PWM_ENABLE;
+
+ cpu_mode = panel->backlight.pwm_enabled && HAS_PCH_LPT(dev_priv) &&
+ !(pch_ctl1 & BLM_PCH_OVERRIDE_ENABLE) &&
+ (cpu_ctl2 & BLM_PWM_ENABLE);
+
+ if (cpu_mode) {
+ val = pch_get_backlight(connector, unused);
+
+ drm_dbg_kms(&dev_priv->drm,
+ "CPU backlight register was enabled, switching to PCH override\n");
+
+ /* Write converted CPU PWM value to PCH override register */
+ lpt_set_backlight(connector->base.state, val);
+ intel_de_write(dev_priv, BLC_PWM_PCH_CTL1,
+ pch_ctl1 | BLM_PCH_OVERRIDE_ENABLE);
+
+ intel_de_write(dev_priv, BLC_PWM_CPU_CTL2,
+ cpu_ctl2 & ~BLM_PWM_ENABLE);
+ }
+
+ return 0;
+}
+
+static int pch_setup_backlight(struct intel_connector *connector, enum pipe unused)
+{
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ struct intel_panel *panel = &connector->panel;
+ u32 cpu_ctl2, pch_ctl1, pch_ctl2;
+
+ pch_ctl1 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
+ panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
+
+ pch_ctl2 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL2);
+ panel->backlight.pwm_level_max = pch_ctl2 >> 16;
+
+ if (!panel->backlight.pwm_level_max)
+ panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
+
+ if (!panel->backlight.pwm_level_max)
+ return -ENODEV;
+
+ panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
+
+ cpu_ctl2 = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2);
+ panel->backlight.pwm_enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
+ (pch_ctl1 & BLM_PCH_PWM_ENABLE);
+
+ return 0;
+}
+
+static int i9xx_setup_backlight(struct intel_connector *connector, enum pipe unused)
+{
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ struct intel_panel *panel = &connector->panel;
+ u32 ctl, val;
+
+ ctl = intel_de_read(dev_priv, BLC_PWM_CTL);
+
+ if (DISPLAY_VER(dev_priv) == 2 || IS_I915GM(dev_priv) || IS_I945GM(dev_priv))
+ panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;
+
+ if (IS_PINEVIEW(dev_priv))
+ panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
+
+ panel->backlight.pwm_level_max = ctl >> 17;
+
+ if (!panel->backlight.pwm_level_max) {
+ panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
+ panel->backlight.pwm_level_max >>= 1;
+ }
+
+ if (!panel->backlight.pwm_level_max)
+ return -ENODEV;
+
+ if (panel->backlight.combination_mode)
+ panel->backlight.pwm_level_max *= 0xff;
+
+ panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
+
+ val = i9xx_get_backlight(connector, unused);
+ val = intel_panel_invert_pwm_level(connector, val);
+ val = clamp(val, panel->backlight.pwm_level_min, panel->backlight.pwm_level_max);
+
+ panel->backlight.pwm_enabled = val != 0;
+
+ return 0;
+}
+
+static int i965_setup_backlight(struct intel_connector *connector, enum pipe unused)
+{
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ struct intel_panel *panel = &connector->panel;
+ u32 ctl, ctl2;
+
+ ctl2 = intel_de_read(dev_priv, BLC_PWM_CTL2);
+ panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
+ panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
+
+ ctl = intel_de_read(dev_priv, BLC_PWM_CTL);
+ panel->backlight.pwm_level_max = ctl >> 16;
+
+ if (!panel->backlight.pwm_level_max)
+ panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
+
+ if (!panel->backlight.pwm_level_max)
+ return -ENODEV;
+
+ if (panel->backlight.combination_mode)
+ panel->backlight.pwm_level_max *= 0xff;
+
+ panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
+
+ panel->backlight.pwm_enabled = ctl2 & BLM_PWM_ENABLE;
+
+ return 0;
+}
+
+static int vlv_setup_backlight(struct intel_connector *connector, enum pipe pipe)
+{
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ struct intel_panel *panel = &connector->panel;
+ u32 ctl, ctl2;
+
+ if (drm_WARN_ON(&dev_priv->drm, pipe != PIPE_A && pipe != PIPE_B))
+ return -ENODEV;
+
+ ctl2 = intel_de_read(dev_priv, VLV_BLC_PWM_CTL2(pipe));
+ panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
+
+ ctl = intel_de_read(dev_priv, VLV_BLC_PWM_CTL(pipe));
+ panel->backlight.pwm_level_max = ctl >> 16;
+
+ if (!panel->backlight.pwm_level_max)
+ panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
+
+ if (!panel->backlight.pwm_level_max)
+ return -ENODEV;
+
+ panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
+
+ panel->backlight.pwm_enabled = ctl2 & BLM_PWM_ENABLE;
+
+ return 0;
+}
+
+static int
+bxt_setup_backlight(struct intel_connector *connector, enum pipe unused)
+{
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ struct intel_panel *panel = &connector->panel;
+ u32 pwm_ctl, val;
+
+ panel->backlight.controller = dev_priv->vbt.backlight.controller;
+
+ pwm_ctl = intel_de_read(dev_priv,
+ BXT_BLC_PWM_CTL(panel->backlight.controller));
+
+ /* Controller 1 uses the utility pin. */
+ if (panel->backlight.controller == 1) {
+ val = intel_de_read(dev_priv, UTIL_PIN_CTL);
+ panel->backlight.util_pin_active_low =
+ val & UTIL_PIN_POLARITY;
+ }
+
+ panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
+ panel->backlight.pwm_level_max =
+ intel_de_read(dev_priv, BXT_BLC_PWM_FREQ(panel->backlight.controller));
+
+ if (!panel->backlight.pwm_level_max)
+ panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
+
+ if (!panel->backlight.pwm_level_max)
+ return -ENODEV;
+
+ panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
+
+ panel->backlight.pwm_enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
+
+ return 0;
+}
+
+static int
+cnp_setup_backlight(struct intel_connector *connector, enum pipe unused)
+{
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ struct intel_panel *panel = &connector->panel;
+ u32 pwm_ctl;
+
+ /*
+ * CNP has the BXT implementation of backlight, but with only one
+ * controller. TODO: ICP has multiple controllers but we only use
+ * controller 0 for now.
+ */
+ panel->backlight.controller = 0;
+
+ pwm_ctl = intel_de_read(dev_priv,
+ BXT_BLC_PWM_CTL(panel->backlight.controller));
+
+ panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
+ panel->backlight.pwm_level_max =
+ intel_de_read(dev_priv, BXT_BLC_PWM_FREQ(panel->backlight.controller));
+
+ if (!panel->backlight.pwm_level_max)
+ panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
+
+ if (!panel->backlight.pwm_level_max)
+ return -ENODEV;
+
+ panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
+
+ panel->backlight.pwm_enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
+
+ return 0;
+}
+
+static int ext_pwm_setup_backlight(struct intel_connector *connector,
+ enum pipe pipe)
+{
+ struct drm_device *dev = connector->base.dev;
+ struct drm_i915_private *dev_priv = to_i915(dev);
+ struct intel_panel *panel = &connector->panel;
+ const char *desc;
+ u32 level;
+
+ /* Get the right PWM chip for DSI backlight according to VBT */
+ if (dev_priv->vbt.dsi.config->pwm_blc == PPS_BLC_PMIC) {
+ panel->backlight.pwm = pwm_get(dev->dev, "pwm_pmic_backlight");
+ desc = "PMIC";
+ } else {
+ panel->backlight.pwm = pwm_get(dev->dev, "pwm_soc_backlight");
+ desc = "SoC";
+ }
+
+ if (IS_ERR(panel->backlight.pwm)) {
+ drm_err(&dev_priv->drm, "Failed to get the %s PWM chip\n",
+ desc);
+ panel->backlight.pwm = NULL;
+ return -ENODEV;
+ }
+
+ panel->backlight.pwm_level_max = 100; /* 100% */
+ panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
+
+ if (pwm_is_enabled(panel->backlight.pwm)) {
+ /* PWM is already enabled, use existing settings */
+ pwm_get_state(panel->backlight.pwm, &panel->backlight.pwm_state);
+
+ level = pwm_get_relative_duty_cycle(&panel->backlight.pwm_state,
+ 100);
+ level = intel_panel_invert_pwm_level(connector, level);
+ panel->backlight.pwm_enabled = true;
+
+ drm_dbg_kms(&dev_priv->drm, "PWM already enabled at freq %ld, VBT freq %d, level %d\n",
+ NSEC_PER_SEC / (unsigned long)panel->backlight.pwm_state.period,
+ get_vbt_pwm_freq(dev_priv), level);
+ } else {
+ /* Set period from VBT frequency, leave other settings at 0. */
+ panel->backlight.pwm_state.period =
+ NSEC_PER_SEC / get_vbt_pwm_freq(dev_priv);
+ }
+
+ drm_info(&dev_priv->drm, "Using %s PWM for LCD backlight control\n",
+ desc);
+ return 0;
+}
+
+static void intel_pwm_set_backlight(const struct drm_connector_state *conn_state, u32 level)
+{
+ struct intel_connector *connector = to_intel_connector(conn_state->connector);
+ struct intel_panel *panel = &connector->panel;
+
+ panel->backlight.pwm_funcs->set(conn_state,
+ intel_panel_invert_pwm_level(connector, level));
+}
+
+static u32 intel_pwm_get_backlight(struct intel_connector *connector, enum pipe pipe)
+{
+ struct intel_panel *panel = &connector->panel;
+
+ return intel_panel_invert_pwm_level(connector,
+ panel->backlight.pwm_funcs->get(connector, pipe));
+}
+
+static void intel_pwm_enable_backlight(const struct intel_crtc_state *crtc_state,
+ const struct drm_connector_state *conn_state, u32 level)
+{
+ struct intel_connector *connector = to_intel_connector(conn_state->connector);
+ struct intel_panel *panel = &connector->panel;
+
+ panel->backlight.pwm_funcs->enable(crtc_state, conn_state,
+ intel_panel_invert_pwm_level(connector, level));
+}
+
+static void intel_pwm_disable_backlight(const struct drm_connector_state *conn_state, u32 level)
+{
+ struct intel_connector *connector = to_intel_connector(conn_state->connector);
+ struct intel_panel *panel = &connector->panel;
+
+ panel->backlight.pwm_funcs->disable(conn_state,
+ intel_panel_invert_pwm_level(connector, level));
+}
+
+static int intel_pwm_setup_backlight(struct intel_connector *connector, enum pipe pipe)
+{
+ struct intel_panel *panel = &connector->panel;
+ int ret = panel->backlight.pwm_funcs->setup(connector, pipe);
+
+ if (ret < 0)
+ return ret;
+
+ panel->backlight.min = panel->backlight.pwm_level_min;
+ panel->backlight.max = panel->backlight.pwm_level_max;
+ panel->backlight.level = intel_pwm_get_backlight(connector, pipe);
+ panel->backlight.enabled = panel->backlight.pwm_enabled;
+
+ return 0;
+}
+
+void intel_panel_update_backlight(struct intel_atomic_state *state,
+ struct intel_encoder *encoder,
+ const struct intel_crtc_state *crtc_state,
+ const struct drm_connector_state *conn_state)
+{
+ struct intel_connector *connector = to_intel_connector(conn_state->connector);
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ struct intel_panel *panel = &connector->panel;
+
+ if (!panel->backlight.present)
+ return;
+
+ mutex_lock(&dev_priv->backlight_lock);
+ if (!panel->backlight.enabled)
+ __intel_panel_enable_backlight(crtc_state, conn_state);
+
+ mutex_unlock(&dev_priv->backlight_lock);
+}
+
+int intel_panel_setup_backlight(struct drm_connector *connector, enum pipe pipe)
+{
+ struct drm_i915_private *dev_priv = to_i915(connector->dev);
+ struct intel_connector *intel_connector = to_intel_connector(connector);
+ struct intel_panel *panel = &intel_connector->panel;
+ int ret;
+
+ if (!dev_priv->vbt.backlight.present) {
+ if (dev_priv->quirks & QUIRK_BACKLIGHT_PRESENT) {
+ drm_dbg_kms(&dev_priv->drm,
+ "no backlight present per VBT, but present per quirk\n");
+ } else {
+ drm_dbg_kms(&dev_priv->drm,
+ "no backlight present per VBT\n");
+ return 0;
+ }
+ }
+
+ /* ensure intel_panel has been initialized first */
+ if (drm_WARN_ON(&dev_priv->drm, !panel->backlight.funcs))
+ return -ENODEV;
+
+ /* set level and max in panel struct */
+ mutex_lock(&dev_priv->backlight_lock);
+ ret = panel->backlight.funcs->setup(intel_connector, pipe);
+ mutex_unlock(&dev_priv->backlight_lock);
+
+ if (ret) {
+ drm_dbg_kms(&dev_priv->drm,
+ "failed to setup backlight for connector %s\n",
+ connector->name);
+ return ret;
+ }
+
+ panel->backlight.present = true;
+
+ drm_dbg_kms(&dev_priv->drm,
+ "Connector %s backlight initialized, %s, brightness %u/%u\n",
+ connector->name,
+ enableddisabled(panel->backlight.enabled),
+ panel->backlight.level, panel->backlight.max);
+
+ return 0;
+}
+
+void intel_panel_destroy_backlight(struct intel_panel *panel)
+{
+ /* dispose of the pwm */
+ if (panel->backlight.pwm)
+ pwm_put(panel->backlight.pwm);
+
+ panel->backlight.present = false;
+}
+
+static const struct intel_panel_bl_funcs bxt_pwm_funcs = {
+ .setup = bxt_setup_backlight,
+ .enable = bxt_enable_backlight,
+ .disable = bxt_disable_backlight,
+ .set = bxt_set_backlight,
+ .get = bxt_get_backlight,
+ .hz_to_pwm = bxt_hz_to_pwm,
+};
+
+static const struct intel_panel_bl_funcs cnp_pwm_funcs = {
+ .setup = cnp_setup_backlight,
+ .enable = cnp_enable_backlight,
+ .disable = cnp_disable_backlight,
+ .set = bxt_set_backlight,
+ .get = bxt_get_backlight,
+ .hz_to_pwm = cnp_hz_to_pwm,
+};
+
+static const struct intel_panel_bl_funcs lpt_pwm_funcs = {
+ .setup = lpt_setup_backlight,
+ .enable = lpt_enable_backlight,
+ .disable = lpt_disable_backlight,
+ .set = lpt_set_backlight,
+ .get = lpt_get_backlight,
+ .hz_to_pwm = lpt_hz_to_pwm,
+};
+
+static const struct intel_panel_bl_funcs spt_pwm_funcs = {
+ .setup = lpt_setup_backlight,
+ .enable = lpt_enable_backlight,
+ .disable = lpt_disable_backlight,
+ .set = lpt_set_backlight,
+ .get = lpt_get_backlight,
+ .hz_to_pwm = spt_hz_to_pwm,
+};
+
+static const struct intel_panel_bl_funcs pch_pwm_funcs = {
+ .setup = pch_setup_backlight,
+ .enable = pch_enable_backlight,
+ .disable = pch_disable_backlight,
+ .set = pch_set_backlight,
+ .get = pch_get_backlight,
+ .hz_to_pwm = pch_hz_to_pwm,
+};
+
+static const struct intel_panel_bl_funcs ext_pwm_funcs = {
+ .setup = ext_pwm_setup_backlight,
+ .enable = ext_pwm_enable_backlight,
+ .disable = ext_pwm_disable_backlight,
+ .set = ext_pwm_set_backlight,
+ .get = ext_pwm_get_backlight,
+};
+
+static const struct intel_panel_bl_funcs vlv_pwm_funcs = {
+ .setup = vlv_setup_backlight,
+ .enable = vlv_enable_backlight,
+ .disable = vlv_disable_backlight,
+ .set = vlv_set_backlight,
+ .get = vlv_get_backlight,
+ .hz_to_pwm = vlv_hz_to_pwm,
+};
+
+static const struct intel_panel_bl_funcs i965_pwm_funcs = {
+ .setup = i965_setup_backlight,
+ .enable = i965_enable_backlight,
+ .disable = i965_disable_backlight,
+ .set = i9xx_set_backlight,
+ .get = i9xx_get_backlight,
+ .hz_to_pwm = i965_hz_to_pwm,
+};
+
+static const struct intel_panel_bl_funcs i9xx_pwm_funcs = {
+ .setup = i9xx_setup_backlight,
+ .enable = i9xx_enable_backlight,
+ .disable = i9xx_disable_backlight,
+ .set = i9xx_set_backlight,
+ .get = i9xx_get_backlight,
+ .hz_to_pwm = i9xx_hz_to_pwm,
+};
+
+static const struct intel_panel_bl_funcs pwm_bl_funcs = {
+ .setup = intel_pwm_setup_backlight,
+ .enable = intel_pwm_enable_backlight,
+ .disable = intel_pwm_disable_backlight,
+ .set = intel_pwm_set_backlight,
+ .get = intel_pwm_get_backlight,
+};
+
+/* Set up chip specific backlight functions */
+void
+intel_panel_init_backlight_funcs(struct intel_panel *panel)
+{
+ struct intel_connector *connector =
+ container_of(panel, struct intel_connector, panel);
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+
+ if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI &&
+ intel_dsi_dcs_init_backlight_funcs(connector) == 0)
+ return;
+
+ if (IS_GEMINILAKE(dev_priv) || IS_BROXTON(dev_priv)) {
+ panel->backlight.pwm_funcs = &bxt_pwm_funcs;
+ } else if (INTEL_PCH_TYPE(dev_priv) >= PCH_CNP) {
+ panel->backlight.pwm_funcs = &cnp_pwm_funcs;
+ } else if (INTEL_PCH_TYPE(dev_priv) >= PCH_LPT) {
+ if (HAS_PCH_LPT(dev_priv))
+ panel->backlight.pwm_funcs = &lpt_pwm_funcs;
+ else
+ panel->backlight.pwm_funcs = &spt_pwm_funcs;
+ } else if (HAS_PCH_SPLIT(dev_priv)) {
+ panel->backlight.pwm_funcs = &pch_pwm_funcs;
+ } else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
+ if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI) {
+ panel->backlight.pwm_funcs = &ext_pwm_funcs;
+ } else {
+ panel->backlight.pwm_funcs = &vlv_pwm_funcs;
+ }
+ } else if (DISPLAY_VER(dev_priv) == 4) {
+ panel->backlight.pwm_funcs = &i965_pwm_funcs;
+ } else {
+ panel->backlight.pwm_funcs = &i9xx_pwm_funcs;
+ }
+
+ if (connector->base.connector_type == DRM_MODE_CONNECTOR_eDP &&
+ intel_dp_aux_init_backlight_funcs(connector) == 0)
+ return;
+
+ /* We're using a standard PWM backlight interface */
+ panel->backlight.funcs = &pwm_bl_funcs;
+}
diff --git a/drivers/gpu/drm/i915/display/intel_backlight.h b/drivers/gpu/drm/i915/display/intel_backlight.h
new file mode 100644
index 0000000000000..282020cb47d5b
--- /dev/null
+++ b/drivers/gpu/drm/i915/display/intel_backlight.h
@@ -0,0 +1,51 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2021 Intel Corporation
+ */
+
+#ifndef __INTEL_BACKLIGHT_H__
+#define __INTEL_BACKLIGHT_H__
+
+#include <linux/types.h>
+
+struct drm_connector;
+struct drm_connector_state;
+struct intel_atomic_state;
+struct intel_connector;
+struct intel_crtc_state;
+struct intel_encoder;
+struct intel_panel;
+enum pipe;
+
+void intel_panel_init_backlight_funcs(struct intel_panel *panel);
+void intel_panel_destroy_backlight(struct intel_panel *panel);
+void intel_panel_set_backlight_acpi(const struct drm_connector_state *conn_state,
+ u32 level, u32 max);
+int intel_panel_setup_backlight(struct drm_connector *connector,
+ enum pipe pipe);
+void intel_panel_enable_backlight(const struct intel_crtc_state *crtc_state,
+ const struct drm_connector_state *conn_state);
+void intel_panel_update_backlight(struct intel_atomic_state *state,
+ struct intel_encoder *encoder,
+ const struct intel_crtc_state *crtc_state,
+ const struct drm_connector_state *conn_state);
+void intel_panel_disable_backlight(const struct drm_connector_state *old_conn_state);
+void intel_panel_set_pwm_level(const struct drm_connector_state *conn_state, u32 level);
+u32 intel_panel_invert_pwm_level(struct intel_connector *connector, u32 level);
+u32 intel_panel_backlight_level_to_pwm(struct intel_connector *connector, u32 level);
+u32 intel_panel_backlight_level_from_pwm(struct intel_connector *connector, u32 val);
+
+#if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
+int intel_backlight_device_register(struct intel_connector *connector);
+void intel_backlight_device_unregister(struct intel_connector *connector);
+#else /* CONFIG_BACKLIGHT_CLASS_DEVICE */
+static inline int intel_backlight_device_register(struct intel_connector *connector)
+{
+ return 0;
+}
+static inline void intel_backlight_device_unregister(struct intel_connector *connector)
+{
+}
+#endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
+
+#endif /* __INTEL_BACKLIGHT_H__ */
diff --git a/drivers/gpu/drm/i915/display/intel_connector.c b/drivers/gpu/drm/i915/display/intel_connector.c
index 9bed1ccecea0d..4f49d782eca23 100644
--- a/drivers/gpu/drm/i915/display/intel_connector.c
+++ b/drivers/gpu/drm/i915/display/intel_connector.c
@@ -29,13 +29,13 @@
#include <drm/drm_atomic_helper.h>
#include <drm/drm_edid.h>

-#include "display/intel_panel.h"
-
#include "i915_drv.h"
+#include "intel_backlight.h"
#include "intel_connector.h"
#include "intel_display_debugfs.h"
#include "intel_display_types.h"
#include "intel_hdcp.h"
+#include "intel_panel.h"

int intel_connector_init(struct intel_connector *connector)
{
diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index f61901e26409e..68489c7298302 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -29,6 +29,7 @@

#include "i915_drv.h"
#include "intel_audio.h"
+#include "intel_backlight.h"
#include "intel_combo_phy.h"
#include "intel_connector.h"
#include "intel_crtc.h"
@@ -49,7 +50,6 @@
#include "intel_hdmi.h"
#include "intel_hotplug.h"
#include "intel_lspcon.h"
-#include "intel_panel.h"
#include "intel_pps.h"
#include "intel_psr.h"
#include "intel_snps_phy.h"
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 631cf7d4323c8..f87e4d510ea5e 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -45,6 +45,7 @@
#include "i915_drv.h"
#include "intel_atomic.h"
#include "intel_audio.h"
+#include "intel_backlight.h"
#include "intel_connector.h"
#include "intel_ddi.h"
#include "intel_de.h"
diff --git a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
index e7b90863aa43d..0a77f0e48aa11 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
@@ -34,10 +34,10 @@
* for some reason.
*/

+#include "intel_backlight.h"
#include "intel_display_types.h"
#include "intel_dp.h"
#include "intel_dp_aux_backlight.h"
-#include "intel_panel.h"

/* TODO:
* Implement HDR, right now we just implement the bare minimum to bring us back into SDR mode so we
diff --git a/drivers/gpu/drm/i915/display/intel_lvds.c b/drivers/gpu/drm/i915/display/intel_lvds.c
index e0381b0fce914..8f5741ebd58dd 100644
--- a/drivers/gpu/drm/i915/display/intel_lvds.c
+++ b/drivers/gpu/drm/i915/display/intel_lvds.c
@@ -40,6 +40,7 @@

#include "i915_drv.h"
#include "intel_atomic.h"
+#include "intel_backlight.h"
#include "intel_connector.h"
#include "intel_de.h"
#include "intel_display_types.h"
diff --git a/drivers/gpu/drm/i915/display/intel_opregion.c b/drivers/gpu/drm/i915/display/intel_opregion.c
index f7f49b69830fa..aad5c1cd3898e 100644
--- a/drivers/gpu/drm/i915/display/intel_opregion.c
+++ b/drivers/gpu/drm/i915/display/intel_opregion.c
@@ -30,10 +30,9 @@
#include <linux/firmware.h>
#include <acpi/video.h>

-#include "display/intel_panel.h"
-
#include "i915_drv.h"
#include "intel_acpi.h"
+#include "intel_backlight.h"
#include "intel_display_types.h"
#include "intel_opregion.h"

diff --git a/drivers/gpu/drm/i915/display/intel_panel.c b/drivers/gpu/drm/i915/display/intel_panel.c
index 7d7a60b4d2de7..ad54767440c15 100644
--- a/drivers/gpu/drm/i915/display/intel_panel.c
+++ b/drivers/gpu/drm/i915/display/intel_panel.c
@@ -28,17 +28,13 @@
* Chris Wilson <chris@chris-wilson.co.uk>
*/

-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
#include <linux/kernel.h>
-#include <linux/moduleparam.h>
#include <linux/pwm.h>

+#include "intel_backlight.h"
#include "intel_connector.h"
#include "intel_de.h"
#include "intel_display_types.h"
-#include "intel_dp_aux_backlight.h"
-#include "intel_dsi_dcs_backlight.h"
#include "intel_panel.h"

void
@@ -456,1767 +452,6 @@ int intel_gmch_panel_fitting(struct intel_crtc_state *crtc_state,
return 0;
}

-/**
- * scale - scale values from one range to another
- * @source_val: value in range [@source_min..@source_max]
- * @source_min: minimum legal value for @source_val
- * @source_max: maximum legal value for @source_val
- * @target_min: corresponding target value for @source_min
- * @target_max: corresponding target value for @source_max
- *
- * Return @source_val in range [@source_min..@source_max] scaled to range
- * [@target_min..@target_max].
- */
-static u32 scale(u32 source_val,
- u32 source_min, u32 source_max,
- u32 target_min, u32 target_max)
-{
- u64 target_val;
-
- WARN_ON(source_min > source_max);
- WARN_ON(target_min > target_max);
-
- /* defensive */
- source_val = clamp(source_val, source_min, source_max);
-
- /* avoid overflows */
- target_val = mul_u32_u32(source_val - source_min,
- target_max - target_min);
- target_val = DIV_ROUND_CLOSEST_ULL(target_val, source_max - source_min);
- target_val += target_min;
-
- return target_val;
-}
-
-/* Scale user_level in range [0..user_max] to [0..hw_max], clamping the result
- * to [hw_min..hw_max]. */
-static u32 clamp_user_to_hw(struct intel_connector *connector,
- u32 user_level, u32 user_max)
-{
- struct intel_panel *panel = &connector->panel;
- u32 hw_level;
-
- hw_level = scale(user_level, 0, user_max, 0, panel->backlight.max);
- hw_level = clamp(hw_level, panel->backlight.min, panel->backlight.max);
-
- return hw_level;
-}
-
-/* Scale hw_level in range [hw_min..hw_max] to [0..user_max]. */
-static u32 scale_hw_to_user(struct intel_connector *connector,
- u32 hw_level, u32 user_max)
-{
- struct intel_panel *panel = &connector->panel;
-
- return scale(hw_level, panel->backlight.min, panel->backlight.max,
- 0, user_max);
-}
-
-u32 intel_panel_invert_pwm_level(struct intel_connector *connector, u32 val)
-{
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
- struct intel_panel *panel = &connector->panel;
-
- drm_WARN_ON(&dev_priv->drm, panel->backlight.pwm_level_max == 0);
-
- if (dev_priv->params.invert_brightness < 0)
- return val;
-
- if (dev_priv->params.invert_brightness > 0 ||
- dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) {
- return panel->backlight.pwm_level_max - val + panel->backlight.pwm_level_min;
- }
-
- return val;
-}
-
-void intel_panel_set_pwm_level(const struct drm_connector_state *conn_state, u32 val)
-{
- struct intel_connector *connector = to_intel_connector(conn_state->connector);
- struct drm_i915_private *i915 = to_i915(connector->base.dev);
- struct intel_panel *panel = &connector->panel;
-
- drm_dbg_kms(&i915->drm, "set backlight PWM = %d\n", val);
- panel->backlight.pwm_funcs->set(conn_state, val);
-}
-
-u32 intel_panel_backlight_level_to_pwm(struct intel_connector *connector, u32 val)
-{
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
- struct intel_panel *panel = &connector->panel;
-
- drm_WARN_ON_ONCE(&dev_priv->drm,
- panel->backlight.max == 0 || panel->backlight.pwm_level_max == 0);
-
- val = scale(val, panel->backlight.min, panel->backlight.max,
- panel->backlight.pwm_level_min, panel->backlight.pwm_level_max);
-
- return intel_panel_invert_pwm_level(connector, val);
-}
-
-u32 intel_panel_backlight_level_from_pwm(struct intel_connector *connector, u32 val)
-{
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
- struct intel_panel *panel = &connector->panel;
-
- drm_WARN_ON_ONCE(&dev_priv->drm,
- panel->backlight.max == 0 || panel->backlight.pwm_level_max == 0);
-
- if (dev_priv->params.invert_brightness > 0 ||
- (dev_priv->params.invert_brightness == 0 && dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS))
- val = panel->backlight.pwm_level_max - (val - panel->backlight.pwm_level_min);
-
- return scale(val, panel->backlight.pwm_level_min, panel->backlight.pwm_level_max,
- panel->backlight.min, panel->backlight.max);
-}
-
-static u32 lpt_get_backlight(struct intel_connector *connector, enum pipe unused)
-{
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
-
- return intel_de_read(dev_priv, BLC_PWM_PCH_CTL2) & BACKLIGHT_DUTY_CYCLE_MASK;
-}
-
-static u32 pch_get_backlight(struct intel_connector *connector, enum pipe unused)
-{
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
-
- return intel_de_read(dev_priv, BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
-}
-
-static u32 i9xx_get_backlight(struct intel_connector *connector, enum pipe unused)
-{
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
- struct intel_panel *panel = &connector->panel;
- u32 val;
-
- val = intel_de_read(dev_priv, BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
- if (DISPLAY_VER(dev_priv) < 4)
- val >>= 1;
-
- if (panel->backlight.combination_mode) {
- u8 lbpc;
-
- pci_read_config_byte(to_pci_dev(dev_priv->drm.dev), LBPC, &lbpc);
- val *= lbpc;
- }
-
- return val;
-}
-
-static u32 vlv_get_backlight(struct intel_connector *connector, enum pipe pipe)
-{
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
-
- if (drm_WARN_ON(&dev_priv->drm, pipe != PIPE_A && pipe != PIPE_B))
- return 0;
-
- return intel_de_read(dev_priv, VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK;
-}
-
-static u32 bxt_get_backlight(struct intel_connector *connector, enum pipe unused)
-{
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
- struct intel_panel *panel = &connector->panel;
-
- return intel_de_read(dev_priv,
- BXT_BLC_PWM_DUTY(panel->backlight.controller));
-}
-
-static u32 ext_pwm_get_backlight(struct intel_connector *connector, enum pipe unused)
-{
- struct intel_panel *panel = &connector->panel;
- struct pwm_state state;
-
- pwm_get_state(panel->backlight.pwm, &state);
- return pwm_get_relative_duty_cycle(&state, 100);
-}
-
-static void lpt_set_backlight(const struct drm_connector_state *conn_state, u32 level)
-{
- struct intel_connector *connector = to_intel_connector(conn_state->connector);
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
-
- u32 val = intel_de_read(dev_priv, BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK;
- intel_de_write(dev_priv, BLC_PWM_PCH_CTL2, val | level);
-}
-
-static void pch_set_backlight(const struct drm_connector_state *conn_state, u32 level)
-{
- struct intel_connector *connector = to_intel_connector(conn_state->connector);
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
- u32 tmp;
-
- tmp = intel_de_read(dev_priv, BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
- intel_de_write(dev_priv, BLC_PWM_CPU_CTL, tmp | level);
-}
-
-static void i9xx_set_backlight(const struct drm_connector_state *conn_state, u32 level)
-{
- struct intel_connector *connector = to_intel_connector(conn_state->connector);
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
- struct intel_panel *panel = &connector->panel;
- u32 tmp, mask;
-
- drm_WARN_ON(&dev_priv->drm, panel->backlight.pwm_level_max == 0);
-
- if (panel->backlight.combination_mode) {
- u8 lbpc;
-
- lbpc = level * 0xfe / panel->backlight.pwm_level_max + 1;
- level /= lbpc;
- pci_write_config_byte(to_pci_dev(dev_priv->drm.dev), LBPC, lbpc);
- }
-
- if (DISPLAY_VER(dev_priv) == 4) {
- mask = BACKLIGHT_DUTY_CYCLE_MASK;
- } else {
- level <<= 1;
- mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV;
- }
-
- tmp = intel_de_read(dev_priv, BLC_PWM_CTL) & ~mask;
- intel_de_write(dev_priv, BLC_PWM_CTL, tmp | level);
-}
-
-static void vlv_set_backlight(const struct drm_connector_state *conn_state, u32 level)
-{
- struct intel_connector *connector = to_intel_connector(conn_state->connector);
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
- enum pipe pipe = to_intel_crtc(conn_state->crtc)->pipe;
- u32 tmp;
-
- tmp = intel_de_read(dev_priv, VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
- intel_de_write(dev_priv, VLV_BLC_PWM_CTL(pipe), tmp | level);
-}
-
-static void bxt_set_backlight(const struct drm_connector_state *conn_state, u32 level)
-{
- struct intel_connector *connector = to_intel_connector(conn_state->connector);
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
- struct intel_panel *panel = &connector->panel;
-
- intel_de_write(dev_priv,
- BXT_BLC_PWM_DUTY(panel->backlight.controller), level);
-}
-
-static void ext_pwm_set_backlight(const struct drm_connector_state *conn_state, u32 level)
-{
- struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel;
-
- pwm_set_relative_duty_cycle(&panel->backlight.pwm_state, level, 100);
- pwm_apply_state(panel->backlight.pwm, &panel->backlight.pwm_state);
-}
-
-static void
-intel_panel_actually_set_backlight(const struct drm_connector_state *conn_state, u32 level)
-{
- struct intel_connector *connector = to_intel_connector(conn_state->connector);
- struct drm_i915_private *i915 = to_i915(connector->base.dev);
- struct intel_panel *panel = &connector->panel;
-
- drm_dbg_kms(&i915->drm, "set backlight level = %d\n", level);
-
- panel->backlight.funcs->set(conn_state, level);
-}
-
-/* set backlight brightness to level in range [0..max], assuming hw min is
- * respected.
- */
-void intel_panel_set_backlight_acpi(const struct drm_connector_state *conn_state,
- u32 user_level, u32 user_max)
-{
- struct intel_connector *connector = to_intel_connector(conn_state->connector);
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
- struct intel_panel *panel = &connector->panel;
- u32 hw_level;
-
- /*
- * Lack of crtc may occur during driver init because
- * connection_mutex isn't held across the entire backlight
- * setup + modeset readout, and the BIOS can issue the
- * requests at any time.
- */
- if (!panel->backlight.present || !conn_state->crtc)
- return;
-
- mutex_lock(&dev_priv->backlight_lock);
-
- drm_WARN_ON(&dev_priv->drm, panel->backlight.max == 0);
-
- hw_level = clamp_user_to_hw(connector, user_level, user_max);
- panel->backlight.level = hw_level;
-
- if (panel->backlight.device)
- panel->backlight.device->props.brightness =
- scale_hw_to_user(connector,
- panel->backlight.level,
- panel->backlight.device->props.max_brightness);
-
- if (panel->backlight.enabled)
- intel_panel_actually_set_backlight(conn_state, hw_level);
-
- mutex_unlock(&dev_priv->backlight_lock);
-}
-
-static void lpt_disable_backlight(const struct drm_connector_state *old_conn_state, u32 level)
-{
- struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
- u32 tmp;
-
- intel_panel_set_pwm_level(old_conn_state, level);
-
- /*
- * Although we don't support or enable CPU PWM with LPT/SPT based
- * systems, it may have been enabled prior to loading the
- * driver. Disable to avoid warnings on LCPLL disable.
- *
- * This needs rework if we need to add support for CPU PWM on PCH split
- * platforms.
- */
- tmp = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2);
- if (tmp & BLM_PWM_ENABLE) {
- drm_dbg_kms(&dev_priv->drm,
- "cpu backlight was enabled, disabling\n");
- intel_de_write(dev_priv, BLC_PWM_CPU_CTL2,
- tmp & ~BLM_PWM_ENABLE);
- }
-
- tmp = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
- intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
-}
-
-static void pch_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
-{
- struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
- u32 tmp;
-
- intel_panel_set_pwm_level(old_conn_state, val);
-
- tmp = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2);
- intel_de_write(dev_priv, BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
-
- tmp = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
- intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
-}
-
-static void i9xx_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
-{
- intel_panel_set_pwm_level(old_conn_state, val);
-}
-
-static void i965_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
-{
- struct drm_i915_private *dev_priv = to_i915(old_conn_state->connector->dev);
- u32 tmp;
-
- intel_panel_set_pwm_level(old_conn_state, val);
-
- tmp = intel_de_read(dev_priv, BLC_PWM_CTL2);
- intel_de_write(dev_priv, BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE);
-}
-
-static void vlv_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
-{
- struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
- enum pipe pipe = to_intel_crtc(old_conn_state->crtc)->pipe;
- u32 tmp;
-
- intel_panel_set_pwm_level(old_conn_state, val);
-
- tmp = intel_de_read(dev_priv, VLV_BLC_PWM_CTL2(pipe));
- intel_de_write(dev_priv, VLV_BLC_PWM_CTL2(pipe),
- tmp & ~BLM_PWM_ENABLE);
-}
-
-static void bxt_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
-{
- struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
- struct intel_panel *panel = &connector->panel;
- u32 tmp;
-
- intel_panel_set_pwm_level(old_conn_state, val);
-
- tmp = intel_de_read(dev_priv,
- BXT_BLC_PWM_CTL(panel->backlight.controller));
- intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
- tmp & ~BXT_BLC_PWM_ENABLE);
-
- if (panel->backlight.controller == 1) {
- val = intel_de_read(dev_priv, UTIL_PIN_CTL);
- val &= ~UTIL_PIN_ENABLE;
- intel_de_write(dev_priv, UTIL_PIN_CTL, val);
- }
-}
-
-static void cnp_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
-{
- struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
- struct intel_panel *panel = &connector->panel;
- u32 tmp;
-
- intel_panel_set_pwm_level(old_conn_state, val);
-
- tmp = intel_de_read(dev_priv,
- BXT_BLC_PWM_CTL(panel->backlight.controller));
- intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
- tmp & ~BXT_BLC_PWM_ENABLE);
-}
-
-static void ext_pwm_disable_backlight(const struct drm_connector_state *old_conn_state, u32 level)
-{
- struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
- struct intel_panel *panel = &connector->panel;
-
- panel->backlight.pwm_state.enabled = false;
- pwm_apply_state(panel->backlight.pwm, &panel->backlight.pwm_state);
-}
-
-void intel_panel_disable_backlight(const struct drm_connector_state *old_conn_state)
-{
- struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
- struct intel_panel *panel = &connector->panel;
-
- if (!panel->backlight.present)
- return;
-
- /*
- * Do not disable backlight on the vga_switcheroo path. When switching
- * away from i915, the other client may depend on i915 to handle the
- * backlight. This will leave the backlight on unnecessarily when
- * another client is not activated.
- */
- if (dev_priv->drm.switch_power_state == DRM_SWITCH_POWER_CHANGING) {
- drm_dbg_kms(&dev_priv->drm,
- "Skipping backlight disable on vga switch\n");
- return;
- }
-
- mutex_lock(&dev_priv->backlight_lock);
-
- if (panel->backlight.device)
- panel->backlight.device->props.power = FB_BLANK_POWERDOWN;
- panel->backlight.enabled = false;
- panel->backlight.funcs->disable(old_conn_state, 0);
-
- mutex_unlock(&dev_priv->backlight_lock);
-}
-
-static void lpt_enable_backlight(const struct intel_crtc_state *crtc_state,
- const struct drm_connector_state *conn_state, u32 level)
-{
- struct intel_connector *connector = to_intel_connector(conn_state->connector);
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
- struct intel_panel *panel = &connector->panel;
- u32 pch_ctl1, pch_ctl2, schicken;
-
- pch_ctl1 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
- if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
- drm_dbg_kms(&dev_priv->drm, "pch backlight already enabled\n");
- pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
- intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, pch_ctl1);
- }
-
- if (HAS_PCH_LPT(dev_priv)) {
- schicken = intel_de_read(dev_priv, SOUTH_CHICKEN2);
- if (panel->backlight.alternate_pwm_increment)
- schicken |= LPT_PWM_GRANULARITY;
- else
- schicken &= ~LPT_PWM_GRANULARITY;
- intel_de_write(dev_priv, SOUTH_CHICKEN2, schicken);
- } else {
- schicken = intel_de_read(dev_priv, SOUTH_CHICKEN1);
- if (panel->backlight.alternate_pwm_increment)
- schicken |= SPT_PWM_GRANULARITY;
- else
- schicken &= ~SPT_PWM_GRANULARITY;
- intel_de_write(dev_priv, SOUTH_CHICKEN1, schicken);
- }
-
- pch_ctl2 = panel->backlight.pwm_level_max << 16;
- intel_de_write(dev_priv, BLC_PWM_PCH_CTL2, pch_ctl2);
-
- pch_ctl1 = 0;
- if (panel->backlight.active_low_pwm)
- pch_ctl1 |= BLM_PCH_POLARITY;
-
- /* After LPT, override is the default. */
- if (HAS_PCH_LPT(dev_priv))
- pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE;
-
- intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, pch_ctl1);
- intel_de_posting_read(dev_priv, BLC_PWM_PCH_CTL1);
- intel_de_write(dev_priv, BLC_PWM_PCH_CTL1,
- pch_ctl1 | BLM_PCH_PWM_ENABLE);
-
- /* This won't stick until the above enable. */
- intel_panel_set_pwm_level(conn_state, level);
-}
-
-static void pch_enable_backlight(const struct intel_crtc_state *crtc_state,
- const struct drm_connector_state *conn_state, u32 level)
-{
- struct intel_connector *connector = to_intel_connector(conn_state->connector);
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
- struct intel_panel *panel = &connector->panel;
- enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
- u32 cpu_ctl2, pch_ctl1, pch_ctl2;
-
- cpu_ctl2 = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2);
- if (cpu_ctl2 & BLM_PWM_ENABLE) {
- drm_dbg_kms(&dev_priv->drm, "cpu backlight already enabled\n");
- cpu_ctl2 &= ~BLM_PWM_ENABLE;
- intel_de_write(dev_priv, BLC_PWM_CPU_CTL2, cpu_ctl2);
- }
-
- pch_ctl1 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
- if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
- drm_dbg_kms(&dev_priv->drm, "pch backlight already enabled\n");
- pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
- intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, pch_ctl1);
- }
-
- if (cpu_transcoder == TRANSCODER_EDP)
- cpu_ctl2 = BLM_TRANSCODER_EDP;
- else
- cpu_ctl2 = BLM_PIPE(cpu_transcoder);
- intel_de_write(dev_priv, BLC_PWM_CPU_CTL2, cpu_ctl2);
- intel_de_posting_read(dev_priv, BLC_PWM_CPU_CTL2);
- intel_de_write(dev_priv, BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);
-
- /* This won't stick until the above enable. */
- intel_panel_set_pwm_level(conn_state, level);
-
- pch_ctl2 = panel->backlight.pwm_level_max << 16;
- intel_de_write(dev_priv, BLC_PWM_PCH_CTL2, pch_ctl2);
-
- pch_ctl1 = 0;
- if (panel->backlight.active_low_pwm)
- pch_ctl1 |= BLM_PCH_POLARITY;
-
- intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, pch_ctl1);
- intel_de_posting_read(dev_priv, BLC_PWM_PCH_CTL1);
- intel_de_write(dev_priv, BLC_PWM_PCH_CTL1,
- pch_ctl1 | BLM_PCH_PWM_ENABLE);
-}
-
-static void i9xx_enable_backlight(const struct intel_crtc_state *crtc_state,
- const struct drm_connector_state *conn_state, u32 level)
-{
- struct intel_connector *connector = to_intel_connector(conn_state->connector);
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
- struct intel_panel *panel = &connector->panel;
- u32 ctl, freq;
-
- ctl = intel_de_read(dev_priv, BLC_PWM_CTL);
- if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {
- drm_dbg_kms(&dev_priv->drm, "backlight already enabled\n");
- intel_de_write(dev_priv, BLC_PWM_CTL, 0);
- }
-
- freq = panel->backlight.pwm_level_max;
- if (panel->backlight.combination_mode)
- freq /= 0xff;
-
- ctl = freq << 17;
- if (panel->backlight.combination_mode)
- ctl |= BLM_LEGACY_MODE;
- if (IS_PINEVIEW(dev_priv) && panel->backlight.active_low_pwm)
- ctl |= BLM_POLARITY_PNV;
-
- intel_de_write(dev_priv, BLC_PWM_CTL, ctl);
- intel_de_posting_read(dev_priv, BLC_PWM_CTL);
-
- /* XXX: combine this into above write? */
- intel_panel_set_pwm_level(conn_state, level);
-
- /*
- * Needed to enable backlight on some 855gm models. BLC_HIST_CTL is
- * 855gm only, but checking for gen2 is safe, as 855gm is the only gen2
- * that has backlight.
- */
- if (DISPLAY_VER(dev_priv) == 2)
- intel_de_write(dev_priv, BLC_HIST_CTL, BLM_HISTOGRAM_ENABLE);
-}
-
-static void i965_enable_backlight(const struct intel_crtc_state *crtc_state,
- const struct drm_connector_state *conn_state, u32 level)
-{
- struct intel_connector *connector = to_intel_connector(conn_state->connector);
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
- struct intel_panel *panel = &connector->panel;
- enum pipe pipe = to_intel_crtc(conn_state->crtc)->pipe;
- u32 ctl, ctl2, freq;
-
- ctl2 = intel_de_read(dev_priv, BLC_PWM_CTL2);
- if (ctl2 & BLM_PWM_ENABLE) {
- drm_dbg_kms(&dev_priv->drm, "backlight already enabled\n");
- ctl2 &= ~BLM_PWM_ENABLE;
- intel_de_write(dev_priv, BLC_PWM_CTL2, ctl2);
- }
-
- freq = panel->backlight.pwm_level_max;
- if (panel->backlight.combination_mode)
- freq /= 0xff;
-
- ctl = freq << 16;
- intel_de_write(dev_priv, BLC_PWM_CTL, ctl);
-
- ctl2 = BLM_PIPE(pipe);
- if (panel->backlight.combination_mode)
- ctl2 |= BLM_COMBINATION_MODE;
- if (panel->backlight.active_low_pwm)
- ctl2 |= BLM_POLARITY_I965;
- intel_de_write(dev_priv, BLC_PWM_CTL2, ctl2);
- intel_de_posting_read(dev_priv, BLC_PWM_CTL2);
- intel_de_write(dev_priv, BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
-
- intel_panel_set_pwm_level(conn_state, level);
-}
-
-static void vlv_enable_backlight(const struct intel_crtc_state *crtc_state,
- const struct drm_connector_state *conn_state, u32 level)
-{
- struct intel_connector *connector = to_intel_connector(conn_state->connector);
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
- struct intel_panel *panel = &connector->panel;
- enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
- u32 ctl, ctl2;
-
- ctl2 = intel_de_read(dev_priv, VLV_BLC_PWM_CTL2(pipe));
- if (ctl2 & BLM_PWM_ENABLE) {
- drm_dbg_kms(&dev_priv->drm, "backlight already enabled\n");
- ctl2 &= ~BLM_PWM_ENABLE;
- intel_de_write(dev_priv, VLV_BLC_PWM_CTL2(pipe), ctl2);
- }
-
- ctl = panel->backlight.pwm_level_max << 16;
- intel_de_write(dev_priv, VLV_BLC_PWM_CTL(pipe), ctl);
-
- /* XXX: combine this into above write? */
- intel_panel_set_pwm_level(conn_state, level);
-
- ctl2 = 0;
- if (panel->backlight.active_low_pwm)
- ctl2 |= BLM_POLARITY_I965;
- intel_de_write(dev_priv, VLV_BLC_PWM_CTL2(pipe), ctl2);
- intel_de_posting_read(dev_priv, VLV_BLC_PWM_CTL2(pipe));
- intel_de_write(dev_priv, VLV_BLC_PWM_CTL2(pipe),
- ctl2 | BLM_PWM_ENABLE);
-}
-
-static void bxt_enable_backlight(const struct intel_crtc_state *crtc_state,
- const struct drm_connector_state *conn_state, u32 level)
-{
- struct intel_connector *connector = to_intel_connector(conn_state->connector);
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
- struct intel_panel *panel = &connector->panel;
- enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
- u32 pwm_ctl, val;
-
- /* Controller 1 uses the utility pin. */
- if (panel->backlight.controller == 1) {
- val = intel_de_read(dev_priv, UTIL_PIN_CTL);
- if (val & UTIL_PIN_ENABLE) {
- drm_dbg_kms(&dev_priv->drm,
- "util pin already enabled\n");
- val &= ~UTIL_PIN_ENABLE;
- intel_de_write(dev_priv, UTIL_PIN_CTL, val);
- }
-
- val = 0;
- if (panel->backlight.util_pin_active_low)
- val |= UTIL_PIN_POLARITY;
- intel_de_write(dev_priv, UTIL_PIN_CTL,
- val | UTIL_PIN_PIPE(pipe) | UTIL_PIN_MODE_PWM | UTIL_PIN_ENABLE);
- }
-
- pwm_ctl = intel_de_read(dev_priv,
- BXT_BLC_PWM_CTL(panel->backlight.controller));
- if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
- drm_dbg_kms(&dev_priv->drm, "backlight already enabled\n");
- pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
- intel_de_write(dev_priv,
- BXT_BLC_PWM_CTL(panel->backlight.controller),
- pwm_ctl);
- }
-
- intel_de_write(dev_priv,
- BXT_BLC_PWM_FREQ(panel->backlight.controller),
- panel->backlight.pwm_level_max);
-
- intel_panel_set_pwm_level(conn_state, level);
-
- pwm_ctl = 0;
- if (panel->backlight.active_low_pwm)
- pwm_ctl |= BXT_BLC_PWM_POLARITY;
-
- intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
- pwm_ctl);
- intel_de_posting_read(dev_priv,
- BXT_BLC_PWM_CTL(panel->backlight.controller));
- intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
- pwm_ctl | BXT_BLC_PWM_ENABLE);
-}
-
-static void cnp_enable_backlight(const struct intel_crtc_state *crtc_state,
- const struct drm_connector_state *conn_state, u32 level)
-{
- struct intel_connector *connector = to_intel_connector(conn_state->connector);
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
- struct intel_panel *panel = &connector->panel;
- u32 pwm_ctl;
-
- pwm_ctl = intel_de_read(dev_priv,
- BXT_BLC_PWM_CTL(panel->backlight.controller));
- if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
- drm_dbg_kms(&dev_priv->drm, "backlight already enabled\n");
- pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
- intel_de_write(dev_priv,
- BXT_BLC_PWM_CTL(panel->backlight.controller),
- pwm_ctl);
- }
-
- intel_de_write(dev_priv,
- BXT_BLC_PWM_FREQ(panel->backlight.controller),
- panel->backlight.pwm_level_max);
-
- intel_panel_set_pwm_level(conn_state, level);
-
- pwm_ctl = 0;
- if (panel->backlight.active_low_pwm)
- pwm_ctl |= BXT_BLC_PWM_POLARITY;
-
- intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
- pwm_ctl);
- intel_de_posting_read(dev_priv,
- BXT_BLC_PWM_CTL(panel->backlight.controller));
- intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller),
- pwm_ctl | BXT_BLC_PWM_ENABLE);
-}
-
-static void ext_pwm_enable_backlight(const struct intel_crtc_state *crtc_state,
- const struct drm_connector_state *conn_state, u32 level)
-{
- struct intel_connector *connector = to_intel_connector(conn_state->connector);
- struct intel_panel *panel = &connector->panel;
-
- pwm_set_relative_duty_cycle(&panel->backlight.pwm_state, level, 100);
- panel->backlight.pwm_state.enabled = true;
- pwm_apply_state(panel->backlight.pwm, &panel->backlight.pwm_state);
-}
-
-static void __intel_panel_enable_backlight(const struct intel_crtc_state *crtc_state,
- const struct drm_connector_state *conn_state)
-{
- struct intel_connector *connector = to_intel_connector(conn_state->connector);
- struct intel_panel *panel = &connector->panel;
-
- WARN_ON(panel->backlight.max == 0);
-
- if (panel->backlight.level <= panel->backlight.min) {
- panel->backlight.level = panel->backlight.max;
- if (panel->backlight.device)
- panel->backlight.device->props.brightness =
- scale_hw_to_user(connector,
- panel->backlight.level,
- panel->backlight.device->props.max_brightness);
- }
-
- panel->backlight.funcs->enable(crtc_state, conn_state, panel->backlight.level);
- panel->backlight.enabled = true;
- if (panel->backlight.device)
- panel->backlight.device->props.power = FB_BLANK_UNBLANK;
-}
-
-void intel_panel_enable_backlight(const struct intel_crtc_state *crtc_state,
- const struct drm_connector_state *conn_state)
-{
- struct intel_connector *connector = to_intel_connector(conn_state->connector);
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
- struct intel_panel *panel = &connector->panel;
- enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
-
- if (!panel->backlight.present)
- return;
-
- drm_dbg_kms(&dev_priv->drm, "pipe %c\n", pipe_name(pipe));
-
- mutex_lock(&dev_priv->backlight_lock);
-
- __intel_panel_enable_backlight(crtc_state, conn_state);
-
- mutex_unlock(&dev_priv->backlight_lock);
-}
-
-#if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
-static u32 intel_panel_get_backlight(struct intel_connector *connector)
-{
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
- struct intel_panel *panel = &connector->panel;
- u32 val = 0;
-
- mutex_lock(&dev_priv->backlight_lock);
-
- if (panel->backlight.enabled)
- val = panel->backlight.funcs->get(connector, intel_connector_get_pipe(connector));
-
- mutex_unlock(&dev_priv->backlight_lock);
-
- drm_dbg_kms(&dev_priv->drm, "get backlight PWM = %d\n", val);
- return val;
-}
-
-/* Scale user_level in range [0..user_max] to [hw_min..hw_max]. */
-static u32 scale_user_to_hw(struct intel_connector *connector,
- u32 user_level, u32 user_max)
-{
- struct intel_panel *panel = &connector->panel;
-
- return scale(user_level, 0, user_max,
- panel->backlight.min, panel->backlight.max);
-}
-
-/* set backlight brightness to level in range [0..max], scaling wrt hw min */
-static void intel_panel_set_backlight(const struct drm_connector_state *conn_state,
- u32 user_level, u32 user_max)
-{
- struct intel_connector *connector = to_intel_connector(conn_state->connector);
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
- struct intel_panel *panel = &connector->panel;
- u32 hw_level;
-
- if (!panel->backlight.present)
- return;
-
- mutex_lock(&dev_priv->backlight_lock);
-
- drm_WARN_ON(&dev_priv->drm, panel->backlight.max == 0);
-
- hw_level = scale_user_to_hw(connector, user_level, user_max);
- panel->backlight.level = hw_level;
-
- if (panel->backlight.enabled)
- intel_panel_actually_set_backlight(conn_state, hw_level);
-
- mutex_unlock(&dev_priv->backlight_lock);
-}
-
-static int intel_backlight_device_update_status(struct backlight_device *bd)
-{
- struct intel_connector *connector = bl_get_data(bd);
- struct intel_panel *panel = &connector->panel;
- struct drm_device *dev = connector->base.dev;
-
- drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
- DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
- bd->props.brightness, bd->props.max_brightness);
- intel_panel_set_backlight(connector->base.state, bd->props.brightness,
- bd->props.max_brightness);
-
- /*
- * Allow flipping bl_power as a sub-state of enabled. Sadly the
- * backlight class device does not make it easy to to differentiate
- * between callbacks for brightness and bl_power, so our backlight_power
- * callback needs to take this into account.
- */
- if (panel->backlight.enabled) {
- if (panel->backlight.power) {
- bool enable = bd->props.power == FB_BLANK_UNBLANK &&
- bd->props.brightness != 0;
- panel->backlight.power(connector, enable);
- }
- } else {
- bd->props.power = FB_BLANK_POWERDOWN;
- }
-
- drm_modeset_unlock(&dev->mode_config.connection_mutex);
- return 0;
-}
-
-static int intel_backlight_device_get_brightness(struct backlight_device *bd)
-{
- struct intel_connector *connector = bl_get_data(bd);
- struct drm_device *dev = connector->base.dev;
- struct drm_i915_private *dev_priv = to_i915(dev);
- intel_wakeref_t wakeref;
- int ret = 0;
-
- with_intel_runtime_pm(&dev_priv->runtime_pm, wakeref) {
- u32 hw_level;
-
- drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
-
- hw_level = intel_panel_get_backlight(connector);
- ret = scale_hw_to_user(connector,
- hw_level, bd->props.max_brightness);
-
- drm_modeset_unlock(&dev->mode_config.connection_mutex);
- }
-
- return ret;
-}
-
-static const struct backlight_ops intel_backlight_device_ops = {
- .update_status = intel_backlight_device_update_status,
- .get_brightness = intel_backlight_device_get_brightness,
-};
-
-int intel_backlight_device_register(struct intel_connector *connector)
-{
- struct drm_i915_private *i915 = to_i915(connector->base.dev);
- struct intel_panel *panel = &connector->panel;
- struct backlight_properties props;
- struct backlight_device *bd;
- const char *name;
- int ret = 0;
-
- if (WARN_ON(panel->backlight.device))
- return -ENODEV;
-
- if (!panel->backlight.present)
- return 0;
-
- WARN_ON(panel->backlight.max == 0);
-
- memset(&props, 0, sizeof(props));
- props.type = BACKLIGHT_RAW;
-
- /*
- * Note: Everything should work even if the backlight device max
- * presented to the userspace is arbitrarily chosen.
- */
- props.max_brightness = panel->backlight.max;
- props.brightness = scale_hw_to_user(connector,
- panel->backlight.level,
- props.max_brightness);
-
- if (panel->backlight.enabled)
- props.power = FB_BLANK_UNBLANK;
- else
- props.power = FB_BLANK_POWERDOWN;
-
- name = kstrdup("intel_backlight", GFP_KERNEL);
- if (!name)
- return -ENOMEM;
-
- bd = backlight_device_register(name, connector->base.kdev, connector,
- &intel_backlight_device_ops, &props);
-
- /*
- * Using the same name independent of the drm device or connector
- * prevents registration of multiple backlight devices in the
- * driver. However, we need to use the default name for backward
- * compatibility. Use unique names for subsequent backlight devices as a
- * fallback when the default name already exists.
- */
- if (IS_ERR(bd) && PTR_ERR(bd) == -EEXIST) {
- kfree(name);
- name = kasprintf(GFP_KERNEL, "card%d-%s-backlight",
- i915->drm.primary->index, connector->base.name);
- if (!name)
- return -ENOMEM;
-
- bd = backlight_device_register(name, connector->base.kdev, connector,
- &intel_backlight_device_ops, &props);
- }
-
- if (IS_ERR(bd)) {
- drm_err(&i915->drm,
- "[CONNECTOR:%d:%s] backlight device %s register failed: %ld\n",
- connector->base.base.id, connector->base.name, name, PTR_ERR(bd));
- ret = PTR_ERR(bd);
- goto out;
- }
-
- panel->backlight.device = bd;
-
- drm_dbg_kms(&i915->drm,
- "[CONNECTOR:%d:%s] backlight device %s registered\n",
- connector->base.base.id, connector->base.name, name);
-
-out:
- kfree(name);
-
- return ret;
-}
-
-void intel_backlight_device_unregister(struct intel_connector *connector)
-{
- struct intel_panel *panel = &connector->panel;
-
- if (panel->backlight.device) {
- backlight_device_unregister(panel->backlight.device);
- panel->backlight.device = NULL;
- }
-}
-#endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
-
-/*
- * CNP: PWM clock frequency is 19.2 MHz or 24 MHz.
- * PWM increment = 1
- */
-static u32 cnp_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
-{
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
-
- return DIV_ROUND_CLOSEST(KHz(RUNTIME_INFO(dev_priv)->rawclk_freq),
- pwm_freq_hz);
-}
-
-/*
- * BXT: PWM clock frequency = 19.2 MHz.
- */
-static u32 bxt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
-{
- return DIV_ROUND_CLOSEST(KHz(19200), pwm_freq_hz);
-}
-
-/*
- * SPT: This value represents the period of the PWM stream in clock periods
- * multiplied by 16 (default increment) or 128 (alternate increment selected in
- * SCHICKEN_1 bit 0). PWM clock is 24 MHz.
- */
-static u32 spt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
-{
- struct intel_panel *panel = &connector->panel;
- u32 mul;
-
- if (panel->backlight.alternate_pwm_increment)
- mul = 128;
- else
- mul = 16;
-
- return DIV_ROUND_CLOSEST(MHz(24), pwm_freq_hz * mul);
-}
-
-/*
- * LPT: This value represents the period of the PWM stream in clock periods
- * multiplied by 128 (default increment) or 16 (alternate increment, selected in
- * LPT SOUTH_CHICKEN2 register bit 5).
- */
-static u32 lpt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
-{
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
- struct intel_panel *panel = &connector->panel;
- u32 mul, clock;
-
- if (panel->backlight.alternate_pwm_increment)
- mul = 16;
- else
- mul = 128;
-
- if (HAS_PCH_LPT_H(dev_priv))
- clock = MHz(135); /* LPT:H */
- else
- clock = MHz(24); /* LPT:LP */
-
- return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul);
-}
-
-/*
- * ILK/SNB/IVB: This value represents the period of the PWM stream in PCH
- * display raw clocks multiplied by 128.
- */
-static u32 pch_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
-{
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
-
- return DIV_ROUND_CLOSEST(KHz(RUNTIME_INFO(dev_priv)->rawclk_freq),
- pwm_freq_hz * 128);
-}
-
-/*
- * Gen2: This field determines the number of time base events (display core
- * clock frequency/32) in total for a complete cycle of modulated backlight
- * control.
- *
- * Gen3: A time base event equals the display core clock ([DevPNV] HRAW clock)
- * divided by 32.
- */
-static u32 i9xx_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
-{
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
- int clock;
-
- if (IS_PINEVIEW(dev_priv))
- clock = KHz(RUNTIME_INFO(dev_priv)->rawclk_freq);
- else
- clock = KHz(dev_priv->cdclk.hw.cdclk);
-
- return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 32);
-}
-
-/*
- * Gen4: This value represents the period of the PWM stream in display core
- * clocks ([DevCTG] HRAW clocks) multiplied by 128.
- *
- */
-static u32 i965_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
-{
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
- int clock;
-
- if (IS_G4X(dev_priv))
- clock = KHz(RUNTIME_INFO(dev_priv)->rawclk_freq);
- else
- clock = KHz(dev_priv->cdclk.hw.cdclk);
-
- return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 128);
-}
-
-/*
- * VLV: This value represents the period of the PWM stream in display core
- * clocks ([DevCTG] 200MHz HRAW clocks) multiplied by 128 or 25MHz S0IX clocks
- * multiplied by 16. CHV uses a 19.2MHz S0IX clock.
- */
-static u32 vlv_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
-{
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
- int mul, clock;
-
- if ((intel_de_read(dev_priv, CBR1_VLV) & CBR_PWM_CLOCK_MUX_SELECT) == 0) {
- if (IS_CHERRYVIEW(dev_priv))
- clock = KHz(19200);
- else
- clock = MHz(25);
- mul = 16;
- } else {
- clock = KHz(RUNTIME_INFO(dev_priv)->rawclk_freq);
- mul = 128;
- }
-
- return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul);
-}
-
-static u16 get_vbt_pwm_freq(struct drm_i915_private *dev_priv)
-{
- u16 pwm_freq_hz = dev_priv->vbt.backlight.pwm_freq_hz;
-
- if (pwm_freq_hz) {
- drm_dbg_kms(&dev_priv->drm,
- "VBT defined backlight frequency %u Hz\n",
- pwm_freq_hz);
- } else {
- pwm_freq_hz = 200;
- drm_dbg_kms(&dev_priv->drm,
- "default backlight frequency %u Hz\n",
- pwm_freq_hz);
- }
-
- return pwm_freq_hz;
-}
-
-static u32 get_backlight_max_vbt(struct intel_connector *connector)
-{
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
- struct intel_panel *panel = &connector->panel;
- u16 pwm_freq_hz = get_vbt_pwm_freq(dev_priv);
- u32 pwm;
-
- if (!panel->backlight.pwm_funcs->hz_to_pwm) {
- drm_dbg_kms(&dev_priv->drm,
- "backlight frequency conversion not supported\n");
- return 0;
- }
-
- pwm = panel->backlight.pwm_funcs->hz_to_pwm(connector, pwm_freq_hz);
- if (!pwm) {
- drm_dbg_kms(&dev_priv->drm,
- "backlight frequency conversion failed\n");
- return 0;
- }
-
- return pwm;
-}
-
-/*
- * Note: The setup hooks can't assume pipe is set!
- */
-static u32 get_backlight_min_vbt(struct intel_connector *connector)
-{
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
- struct intel_panel *panel = &connector->panel;
- int min;
-
- drm_WARN_ON(&dev_priv->drm, panel->backlight.pwm_level_max == 0);
-
- /*
- * XXX: If the vbt value is 255, it makes min equal to max, which leads
- * to problems. There are such machines out there. Either our
- * interpretation is wrong or the vbt has bogus data. Or both. Safeguard
- * against this by letting the minimum be at most (arbitrarily chosen)
- * 25% of the max.
- */
- min = clamp_t(int, dev_priv->vbt.backlight.min_brightness, 0, 64);
- if (min != dev_priv->vbt.backlight.min_brightness) {
- drm_dbg_kms(&dev_priv->drm,
- "clamping VBT min backlight %d/255 to %d/255\n",
- dev_priv->vbt.backlight.min_brightness, min);
- }
-
- /* vbt value is a coefficient in range [0..255] */
- return scale(min, 0, 255, 0, panel->backlight.pwm_level_max);
-}
-
-static int lpt_setup_backlight(struct intel_connector *connector, enum pipe unused)
-{
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
- struct intel_panel *panel = &connector->panel;
- u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
- bool alt, cpu_mode;
-
- if (HAS_PCH_LPT(dev_priv))
- alt = intel_de_read(dev_priv, SOUTH_CHICKEN2) & LPT_PWM_GRANULARITY;
- else
- alt = intel_de_read(dev_priv, SOUTH_CHICKEN1) & SPT_PWM_GRANULARITY;
- panel->backlight.alternate_pwm_increment = alt;
-
- pch_ctl1 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
- panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
-
- pch_ctl2 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL2);
- panel->backlight.pwm_level_max = pch_ctl2 >> 16;
-
- cpu_ctl2 = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2);
-
- if (!panel->backlight.pwm_level_max)
- panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
-
- if (!panel->backlight.pwm_level_max)
- return -ENODEV;
-
- panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
-
- panel->backlight.pwm_enabled = pch_ctl1 & BLM_PCH_PWM_ENABLE;
-
- cpu_mode = panel->backlight.pwm_enabled && HAS_PCH_LPT(dev_priv) &&
- !(pch_ctl1 & BLM_PCH_OVERRIDE_ENABLE) &&
- (cpu_ctl2 & BLM_PWM_ENABLE);
-
- if (cpu_mode) {
- val = pch_get_backlight(connector, unused);
-
- drm_dbg_kms(&dev_priv->drm,
- "CPU backlight register was enabled, switching to PCH override\n");
-
- /* Write converted CPU PWM value to PCH override register */
- lpt_set_backlight(connector->base.state, val);
- intel_de_write(dev_priv, BLC_PWM_PCH_CTL1,
- pch_ctl1 | BLM_PCH_OVERRIDE_ENABLE);
-
- intel_de_write(dev_priv, BLC_PWM_CPU_CTL2,
- cpu_ctl2 & ~BLM_PWM_ENABLE);
- }
-
- return 0;
-}
-
-static int pch_setup_backlight(struct intel_connector *connector, enum pipe unused)
-{
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
- struct intel_panel *panel = &connector->panel;
- u32 cpu_ctl2, pch_ctl1, pch_ctl2;
-
- pch_ctl1 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
- panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
-
- pch_ctl2 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL2);
- panel->backlight.pwm_level_max = pch_ctl2 >> 16;
-
- if (!panel->backlight.pwm_level_max)
- panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
-
- if (!panel->backlight.pwm_level_max)
- return -ENODEV;
-
- panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
-
- cpu_ctl2 = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2);
- panel->backlight.pwm_enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
- (pch_ctl1 & BLM_PCH_PWM_ENABLE);
-
- return 0;
-}
-
-static int i9xx_setup_backlight(struct intel_connector *connector, enum pipe unused)
-{
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
- struct intel_panel *panel = &connector->panel;
- u32 ctl, val;
-
- ctl = intel_de_read(dev_priv, BLC_PWM_CTL);
-
- if (DISPLAY_VER(dev_priv) == 2 || IS_I915GM(dev_priv) || IS_I945GM(dev_priv))
- panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;
-
- if (IS_PINEVIEW(dev_priv))
- panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
-
- panel->backlight.pwm_level_max = ctl >> 17;
-
- if (!panel->backlight.pwm_level_max) {
- panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
- panel->backlight.pwm_level_max >>= 1;
- }
-
- if (!panel->backlight.pwm_level_max)
- return -ENODEV;
-
- if (panel->backlight.combination_mode)
- panel->backlight.pwm_level_max *= 0xff;
-
- panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
-
- val = i9xx_get_backlight(connector, unused);
- val = intel_panel_invert_pwm_level(connector, val);
- val = clamp(val, panel->backlight.pwm_level_min, panel->backlight.pwm_level_max);
-
- panel->backlight.pwm_enabled = val != 0;
-
- return 0;
-}
-
-static int i965_setup_backlight(struct intel_connector *connector, enum pipe unused)
-{
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
- struct intel_panel *panel = &connector->panel;
- u32 ctl, ctl2;
-
- ctl2 = intel_de_read(dev_priv, BLC_PWM_CTL2);
- panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
- panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
-
- ctl = intel_de_read(dev_priv, BLC_PWM_CTL);
- panel->backlight.pwm_level_max = ctl >> 16;
-
- if (!panel->backlight.pwm_level_max)
- panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
-
- if (!panel->backlight.pwm_level_max)
- return -ENODEV;
-
- if (panel->backlight.combination_mode)
- panel->backlight.pwm_level_max *= 0xff;
-
- panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
-
- panel->backlight.pwm_enabled = ctl2 & BLM_PWM_ENABLE;
-
- return 0;
-}
-
-static int vlv_setup_backlight(struct intel_connector *connector, enum pipe pipe)
-{
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
- struct intel_panel *panel = &connector->panel;
- u32 ctl, ctl2;
-
- if (drm_WARN_ON(&dev_priv->drm, pipe != PIPE_A && pipe != PIPE_B))
- return -ENODEV;
-
- ctl2 = intel_de_read(dev_priv, VLV_BLC_PWM_CTL2(pipe));
- panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
-
- ctl = intel_de_read(dev_priv, VLV_BLC_PWM_CTL(pipe));
- panel->backlight.pwm_level_max = ctl >> 16;
-
- if (!panel->backlight.pwm_level_max)
- panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
-
- if (!panel->backlight.pwm_level_max)
- return -ENODEV;
-
- panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
-
- panel->backlight.pwm_enabled = ctl2 & BLM_PWM_ENABLE;
-
- return 0;
-}
-
-static int
-bxt_setup_backlight(struct intel_connector *connector, enum pipe unused)
-{
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
- struct intel_panel *panel = &connector->panel;
- u32 pwm_ctl, val;
-
- panel->backlight.controller = dev_priv->vbt.backlight.controller;
-
- pwm_ctl = intel_de_read(dev_priv,
- BXT_BLC_PWM_CTL(panel->backlight.controller));
-
- /* Controller 1 uses the utility pin. */
- if (panel->backlight.controller == 1) {
- val = intel_de_read(dev_priv, UTIL_PIN_CTL);
- panel->backlight.util_pin_active_low =
- val & UTIL_PIN_POLARITY;
- }
-
- panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
- panel->backlight.pwm_level_max =
- intel_de_read(dev_priv, BXT_BLC_PWM_FREQ(panel->backlight.controller));
-
- if (!panel->backlight.pwm_level_max)
- panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
-
- if (!panel->backlight.pwm_level_max)
- return -ENODEV;
-
- panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
-
- panel->backlight.pwm_enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
-
- return 0;
-}
-
-static int
-cnp_setup_backlight(struct intel_connector *connector, enum pipe unused)
-{
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
- struct intel_panel *panel = &connector->panel;
- u32 pwm_ctl;
-
- /*
- * CNP has the BXT implementation of backlight, but with only one
- * controller. TODO: ICP has multiple controllers but we only use
- * controller 0 for now.
- */
- panel->backlight.controller = 0;
-
- pwm_ctl = intel_de_read(dev_priv,
- BXT_BLC_PWM_CTL(panel->backlight.controller));
-
- panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
- panel->backlight.pwm_level_max =
- intel_de_read(dev_priv, BXT_BLC_PWM_FREQ(panel->backlight.controller));
-
- if (!panel->backlight.pwm_level_max)
- panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
-
- if (!panel->backlight.pwm_level_max)
- return -ENODEV;
-
- panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
-
- panel->backlight.pwm_enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
-
- return 0;
-}
-
-static int ext_pwm_setup_backlight(struct intel_connector *connector,
- enum pipe pipe)
-{
- struct drm_device *dev = connector->base.dev;
- struct drm_i915_private *dev_priv = to_i915(dev);
- struct intel_panel *panel = &connector->panel;
- const char *desc;
- u32 level;
-
- /* Get the right PWM chip for DSI backlight according to VBT */
- if (dev_priv->vbt.dsi.config->pwm_blc == PPS_BLC_PMIC) {
- panel->backlight.pwm = pwm_get(dev->dev, "pwm_pmic_backlight");
- desc = "PMIC";
- } else {
- panel->backlight.pwm = pwm_get(dev->dev, "pwm_soc_backlight");
- desc = "SoC";
- }
-
- if (IS_ERR(panel->backlight.pwm)) {
- drm_err(&dev_priv->drm, "Failed to get the %s PWM chip\n",
- desc);
- panel->backlight.pwm = NULL;
- return -ENODEV;
- }
-
- panel->backlight.pwm_level_max = 100; /* 100% */
- panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
-
- if (pwm_is_enabled(panel->backlight.pwm)) {
- /* PWM is already enabled, use existing settings */
- pwm_get_state(panel->backlight.pwm, &panel->backlight.pwm_state);
-
- level = pwm_get_relative_duty_cycle(&panel->backlight.pwm_state,
- 100);
- level = intel_panel_invert_pwm_level(connector, level);
- panel->backlight.pwm_enabled = true;
-
- drm_dbg_kms(&dev_priv->drm, "PWM already enabled at freq %ld, VBT freq %d, level %d\n",
- NSEC_PER_SEC / (unsigned long)panel->backlight.pwm_state.period,
- get_vbt_pwm_freq(dev_priv), level);
- } else {
- /* Set period from VBT frequency, leave other settings at 0. */
- panel->backlight.pwm_state.period =
- NSEC_PER_SEC / get_vbt_pwm_freq(dev_priv);
- }
-
- drm_info(&dev_priv->drm, "Using %s PWM for LCD backlight control\n",
- desc);
- return 0;
-}
-
-static void intel_pwm_set_backlight(const struct drm_connector_state *conn_state, u32 level)
-{
- struct intel_connector *connector = to_intel_connector(conn_state->connector);
- struct intel_panel *panel = &connector->panel;
-
- panel->backlight.pwm_funcs->set(conn_state,
- intel_panel_invert_pwm_level(connector, level));
-}
-
-static u32 intel_pwm_get_backlight(struct intel_connector *connector, enum pipe pipe)
-{
- struct intel_panel *panel = &connector->panel;
-
- return intel_panel_invert_pwm_level(connector,
- panel->backlight.pwm_funcs->get(connector, pipe));
-}
-
-static void intel_pwm_enable_backlight(const struct intel_crtc_state *crtc_state,
- const struct drm_connector_state *conn_state, u32 level)
-{
- struct intel_connector *connector = to_intel_connector(conn_state->connector);
- struct intel_panel *panel = &connector->panel;
-
- panel->backlight.pwm_funcs->enable(crtc_state, conn_state,
- intel_panel_invert_pwm_level(connector, level));
-}
-
-static void intel_pwm_disable_backlight(const struct drm_connector_state *conn_state, u32 level)
-{
- struct intel_connector *connector = to_intel_connector(conn_state->connector);
- struct intel_panel *panel = &connector->panel;
-
- panel->backlight.pwm_funcs->disable(conn_state,
- intel_panel_invert_pwm_level(connector, level));
-}
-
-static int intel_pwm_setup_backlight(struct intel_connector *connector, enum pipe pipe)
-{
- struct intel_panel *panel = &connector->panel;
- int ret = panel->backlight.pwm_funcs->setup(connector, pipe);
-
- if (ret < 0)
- return ret;
-
- panel->backlight.min = panel->backlight.pwm_level_min;
- panel->backlight.max = panel->backlight.pwm_level_max;
- panel->backlight.level = intel_pwm_get_backlight(connector, pipe);
- panel->backlight.enabled = panel->backlight.pwm_enabled;
-
- return 0;
-}
-
-void intel_panel_update_backlight(struct intel_atomic_state *state,
- struct intel_encoder *encoder,
- const struct intel_crtc_state *crtc_state,
- const struct drm_connector_state *conn_state)
-{
- struct intel_connector *connector = to_intel_connector(conn_state->connector);
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
- struct intel_panel *panel = &connector->panel;
-
- if (!panel->backlight.present)
- return;
-
- mutex_lock(&dev_priv->backlight_lock);
- if (!panel->backlight.enabled)
- __intel_panel_enable_backlight(crtc_state, conn_state);
-
- mutex_unlock(&dev_priv->backlight_lock);
-}
-
-int intel_panel_setup_backlight(struct drm_connector *connector, enum pipe pipe)
-{
- struct drm_i915_private *dev_priv = to_i915(connector->dev);
- struct intel_connector *intel_connector = to_intel_connector(connector);
- struct intel_panel *panel = &intel_connector->panel;
- int ret;
-
- if (!dev_priv->vbt.backlight.present) {
- if (dev_priv->quirks & QUIRK_BACKLIGHT_PRESENT) {
- drm_dbg_kms(&dev_priv->drm,
- "no backlight present per VBT, but present per quirk\n");
- } else {
- drm_dbg_kms(&dev_priv->drm,
- "no backlight present per VBT\n");
- return 0;
- }
- }
-
- /* ensure intel_panel has been initialized first */
- if (drm_WARN_ON(&dev_priv->drm, !panel->backlight.funcs))
- return -ENODEV;
-
- /* set level and max in panel struct */
- mutex_lock(&dev_priv->backlight_lock);
- ret = panel->backlight.funcs->setup(intel_connector, pipe);
- mutex_unlock(&dev_priv->backlight_lock);
-
- if (ret) {
- drm_dbg_kms(&dev_priv->drm,
- "failed to setup backlight for connector %s\n",
- connector->name);
- return ret;
- }
-
- panel->backlight.present = true;
-
- drm_dbg_kms(&dev_priv->drm,
- "Connector %s backlight initialized, %s, brightness %u/%u\n",
- connector->name,
- enableddisabled(panel->backlight.enabled),
- panel->backlight.level, panel->backlight.max);
-
- return 0;
-}
-
-static void intel_panel_destroy_backlight(struct intel_panel *panel)
-{
- /* dispose of the pwm */
- if (panel->backlight.pwm)
- pwm_put(panel->backlight.pwm);
-
- panel->backlight.present = false;
-}
-
-static const struct intel_panel_bl_funcs bxt_pwm_funcs = {
- .setup = bxt_setup_backlight,
- .enable = bxt_enable_backlight,
- .disable = bxt_disable_backlight,
- .set = bxt_set_backlight,
- .get = bxt_get_backlight,
- .hz_to_pwm = bxt_hz_to_pwm,
-};
-
-static const struct intel_panel_bl_funcs cnp_pwm_funcs = {
- .setup = cnp_setup_backlight,
- .enable = cnp_enable_backlight,
- .disable = cnp_disable_backlight,
- .set = bxt_set_backlight,
- .get = bxt_get_backlight,
- .hz_to_pwm = cnp_hz_to_pwm,
-};
-
-static const struct intel_panel_bl_funcs lpt_pwm_funcs = {
- .setup = lpt_setup_backlight,
- .enable = lpt_enable_backlight,
- .disable = lpt_disable_backlight,
- .set = lpt_set_backlight,
- .get = lpt_get_backlight,
- .hz_to_pwm = lpt_hz_to_pwm,
-};
-
-static const struct intel_panel_bl_funcs spt_pwm_funcs = {
- .setup = lpt_setup_backlight,
- .enable = lpt_enable_backlight,
- .disable = lpt_disable_backlight,
- .set = lpt_set_backlight,
- .get = lpt_get_backlight,
- .hz_to_pwm = spt_hz_to_pwm,
-};
-
-static const struct intel_panel_bl_funcs pch_pwm_funcs = {
- .setup = pch_setup_backlight,
- .enable = pch_enable_backlight,
- .disable = pch_disable_backlight,
- .set = pch_set_backlight,
- .get = pch_get_backlight,
- .hz_to_pwm = pch_hz_to_pwm,
-};
-
-static const struct intel_panel_bl_funcs ext_pwm_funcs = {
- .setup = ext_pwm_setup_backlight,
- .enable = ext_pwm_enable_backlight,
- .disable = ext_pwm_disable_backlight,
- .set = ext_pwm_set_backlight,
- .get = ext_pwm_get_backlight,
-};
-
-static const struct intel_panel_bl_funcs vlv_pwm_funcs = {
- .setup = vlv_setup_backlight,
- .enable = vlv_enable_backlight,
- .disable = vlv_disable_backlight,
- .set = vlv_set_backlight,
- .get = vlv_get_backlight,
- .hz_to_pwm = vlv_hz_to_pwm,
-};
-
-static const struct intel_panel_bl_funcs i965_pwm_funcs = {
- .setup = i965_setup_backlight,
- .enable = i965_enable_backlight,
- .disable = i965_disable_backlight,
- .set = i9xx_set_backlight,
- .get = i9xx_get_backlight,
- .hz_to_pwm = i965_hz_to_pwm,
-};
-
-static const struct intel_panel_bl_funcs i9xx_pwm_funcs = {
- .setup = i9xx_setup_backlight,
- .enable = i9xx_enable_backlight,
- .disable = i9xx_disable_backlight,
- .set = i9xx_set_backlight,
- .get = i9xx_get_backlight,
- .hz_to_pwm = i9xx_hz_to_pwm,
-};
-
-static const struct intel_panel_bl_funcs pwm_bl_funcs = {
- .setup = intel_pwm_setup_backlight,
- .enable = intel_pwm_enable_backlight,
- .disable = intel_pwm_disable_backlight,
- .set = intel_pwm_set_backlight,
- .get = intel_pwm_get_backlight,
-};
-
-/* Set up chip specific backlight functions */
-static void
-intel_panel_init_backlight_funcs(struct intel_panel *panel)
-{
- struct intel_connector *connector =
- container_of(panel, struct intel_connector, panel);
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
-
- if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI &&
- intel_dsi_dcs_init_backlight_funcs(connector) == 0)
- return;
-
- if (IS_GEMINILAKE(dev_priv) || IS_BROXTON(dev_priv)) {
- panel->backlight.pwm_funcs = &bxt_pwm_funcs;
- } else if (INTEL_PCH_TYPE(dev_priv) >= PCH_CNP) {
- panel->backlight.pwm_funcs = &cnp_pwm_funcs;
- } else if (INTEL_PCH_TYPE(dev_priv) >= PCH_LPT) {
- if (HAS_PCH_LPT(dev_priv))
- panel->backlight.pwm_funcs = &lpt_pwm_funcs;
- else
- panel->backlight.pwm_funcs = &spt_pwm_funcs;
- } else if (HAS_PCH_SPLIT(dev_priv)) {
- panel->backlight.pwm_funcs = &pch_pwm_funcs;
- } else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
- if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI) {
- panel->backlight.pwm_funcs = &ext_pwm_funcs;
- } else {
- panel->backlight.pwm_funcs = &vlv_pwm_funcs;
- }
- } else if (DISPLAY_VER(dev_priv) == 4) {
- panel->backlight.pwm_funcs = &i965_pwm_funcs;
- } else {
- panel->backlight.pwm_funcs = &i9xx_pwm_funcs;
- }
-
- if (connector->base.connector_type == DRM_MODE_CONNECTOR_eDP &&
- intel_dp_aux_init_backlight_funcs(connector) == 0)
- return;
-
- /* We're using a standard PWM backlight interface */
- panel->backlight.funcs = &pwm_bl_funcs;
-}
-
enum drm_connector_status
intel_panel_detect(struct drm_connector *connector, bool force)
{
diff --git a/drivers/gpu/drm/i915/display/intel_panel.h b/drivers/gpu/drm/i915/display/intel_panel.h
index 1d340f77bffc7..67dbb15026bf1 100644
--- a/drivers/gpu/drm/i915/display/intel_panel.h
+++ b/drivers/gpu/drm/i915/display/intel_panel.h
@@ -8,15 +8,13 @@

#include <linux/types.h>

-#include "intel_display.h"
-
+enum drm_connector_status;
struct drm_connector;
struct drm_connector_state;
struct drm_display_mode;
+struct drm_i915_private;
struct intel_connector;
-struct intel_crtc;
struct intel_crtc_state;
-struct intel_encoder;
struct intel_panel;

int intel_panel_init(struct intel_panel *panel,
@@ -31,17 +29,6 @@ int intel_pch_panel_fitting(struct intel_crtc_state *crtc_state,
const struct drm_connector_state *conn_state);
int intel_gmch_panel_fitting(struct intel_crtc_state *crtc_state,
const struct drm_connector_state *conn_state);
-void intel_panel_set_backlight_acpi(const struct drm_connector_state *conn_state,
- u32 level, u32 max);
-int intel_panel_setup_backlight(struct drm_connector *connector,
- enum pipe pipe);
-void intel_panel_enable_backlight(const struct intel_crtc_state *crtc_state,
- const struct drm_connector_state *conn_state);
-void intel_panel_update_backlight(struct intel_atomic_state *state,
- struct intel_encoder *encoder,
- const struct intel_crtc_state *crtc_state,
- const struct drm_connector_state *conn_state);
-void intel_panel_disable_backlight(const struct drm_connector_state *old_conn_state);
struct drm_display_mode *
intel_panel_edid_downclock_mode(struct intel_connector *connector,
const struct drm_display_mode *fixed_mode);
@@ -49,22 +36,5 @@ struct drm_display_mode *
intel_panel_edid_fixed_mode(struct intel_connector *connector);
struct drm_display_mode *
intel_panel_vbt_fixed_mode(struct intel_connector *connector);
-void intel_panel_set_pwm_level(const struct drm_connector_state *conn_state, u32 level);
-u32 intel_panel_invert_pwm_level(struct intel_connector *connector, u32 level);
-u32 intel_panel_backlight_level_to_pwm(struct intel_connector *connector, u32 level);
-u32 intel_panel_backlight_level_from_pwm(struct intel_connector *connector, u32 val);
-
-#if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
-int intel_backlight_device_register(struct intel_connector *connector);
-void intel_backlight_device_unregister(struct intel_connector *connector);
-#else /* CONFIG_BACKLIGHT_CLASS_DEVICE */
-static inline int intel_backlight_device_register(struct intel_connector *connector)
-{
- return 0;
-}
-static inline void intel_backlight_device_unregister(struct intel_connector *connector)
-{
-}
-#endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */

#endif /* __INTEL_PANEL_H__ */
diff --git a/drivers/gpu/drm/i915/display/vlv_dsi.c b/drivers/gpu/drm/i915/display/vlv_dsi.c
index 0ee4ff341e25d..b27738df447d0 100644
--- a/drivers/gpu/drm/i915/display/vlv_dsi.c
+++ b/drivers/gpu/drm/i915/display/vlv_dsi.c
@@ -32,6 +32,7 @@

#include "i915_drv.h"
#include "intel_atomic.h"
+#include "intel_backlight.h"
#include "intel_connector.h"
#include "intel_crtc.h"
#include "intel_de.h"
--
2.35.1