[PATCH v2 2/4] drm/i915: Add lspcon support for I915 driver

Shashank Sharma
2016-06-21T14:51:35Z

This patch adds a new file, to accommodate lspcon support
for I915 driver. These functions probe, detect, initialize
and configure an on-board lspcon device during the driver
init time.

Also, this patch adds a small structure for lspcon device,
which will provide the runtime status of the device.

V2: addressed ville's review comments
- Clean the leftover macros from previous patch set

Signed-off-by: Shashank Sharma <shashank.sharma@intel.com>
Signed-off-by: Akashdeep Sharma <akashdeep.sharma@intel.com>
---
drivers/gpu/drm/i915/Makefile | 1 +
drivers/gpu/drm/i915/intel_drv.h | 13 +++-
drivers/gpu/drm/i915/intel_lspcon.c | 145 ++++++++++++++++++++++++++++++++++++
3 files changed, 158 insertions(+), 1 deletion(-)
create mode 100644 drivers/gpu/drm/i915/intel_lspcon.c

diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index 276abf1..d40ff7d 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -93,6 +93,7 @@ i915-y += dvo_ch7017.o \
intel_dvo.o \
intel_hdmi.o \
intel_i2c.o \
+ intel_lspcon.o \
intel_lvds.o \
intel_panel.o \
intel_sdvo.o \
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 7d0e071..4e49c16 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -894,12 +894,19 @@ struct intel_dp {
bool compliance_test_active;
};

+struct intel_lspcon {
+ bool active;
+ enum drm_lspcon_mode mode_of_op;
+ struct drm_dp_aux *aux;
+};
+
struct intel_digital_port {
struct intel_encoder base;
enum port port;
u32 saved_port_bits;
struct intel_dp dp;
struct intel_hdmi hdmi;
+ struct intel_lspcon lspcon;
enum irqreturn (*hpd_pulse)(struct intel_digital_port *, bool);
bool release_cl2_override;
uint8_t max_lanes;
@@ -1450,7 +1457,6 @@ bool intel_hdmi_compute_config(struct intel_encoder *encoder,
struct intel_crtc_state *pipe_config);
void intel_dp_dual_mode_set_tmds_output(struct intel_hdmi *hdmi, bool enable);

-
/* intel_lvds.c */
void intel_lvds_init(struct drm_device *dev);
bool intel_is_dual_link_lvds(struct drm_device *dev);
@@ -1745,4 +1751,9 @@ int intel_color_check(struct drm_crtc *crtc, struct drm_crtc_state *state);
void intel_color_set_csc(struct drm_crtc_state *crtc_state);
void intel_color_load_luts(struct drm_crtc_state *crtc_state);

+/* intel_lspcon.c */
+bool lspcon_init(struct intel_digital_port *intel_dig_port);
+enum drm_connector_status
+lspcon_ls_mode_detect(struct drm_connector *connector, bool force);
+bool is_lspcon_active(struct intel_digital_port *dig_port);
#endif /* __INTEL_DRV_H__ */
diff --git a/drivers/gpu/drm/i915/intel_lspcon.c b/drivers/gpu/drm/i915/intel_lspcon.c
new file mode 100644
index 0000000..fdeff71
--- /dev/null
+++ b/drivers/gpu/drm/i915/intel_lspcon.c
@@ -0,0 +1,145 @@
+/*
+ * Copyright © 2016 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ *
+ */
+#include <drm/drm_edid.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_dp_dual_mode_helper.h>
+#include "intel_drv.h"
+
+bool is_lspcon_active(struct intel_digital_port *dig_port)
+{
+ return dig_port->lspcon.active;
+}
+
+enum drm_lspcon_mode lspcon_get_current_mode(struct intel_lspcon *lspcon)
+{
+ enum drm_lspcon_mode current_mode = DRM_LSPCON_MODE_INVALID;
+ struct i2c_adapter *adapter = &lspcon->aux->ddc;
+
+ if (drm_lspcon_get_mode(adapter, &current_mode))
+ DRM_ERROR("Error reading LSPCON mode\n");
+ else
+ DRM_DEBUG_KMS("Current LSPCON mode %s\n",
+ current_mode == DRM_LSPCON_MODE_PCON ? "PCON" : "LS");
+ return current_mode;
+}
+
+int lspcon_change_mode(struct intel_lspcon *lspcon,
+ enum drm_lspcon_mode mode, bool force)
+{
+ int err;
+ enum drm_lspcon_mode current_mode;
+ struct i2c_adapter *adapter = &lspcon->aux->ddc;
+
+ err = drm_lspcon_get_mode(adapter, &current_mode);
+ if (err) {
+ DRM_ERROR("Error reading LSPCON mode\n");
+ return err;
+ }
+
+ if (current_mode == mode && !force) {
+ DRM_DEBUG_KMS("Current mode = desired LSPCON mode\n");
+ return 0;
+ }
+
+ err = drm_lspcon_set_mode(adapter, mode);
+ if (err < 0) {
+ DRM_ERROR("LSPCON mode change failed\n");
+ return err;
+ }
+
+ lspcon->mode_of_op = mode;
+ DRM_DEBUG_KMS("LSPCON mode changed done\n");
+ return 0;
+}
+
+bool lspcon_detect_identifier(struct intel_lspcon *lspcon)
+{
+ enum drm_dp_dual_mode_type adaptor_type;
+ struct i2c_adapter *adapter = &lspcon->aux->ddc;
+
+ /* Lets probe the adaptor and check its type */
+ adaptor_type = drm_dp_dual_mode_detect(adapter);
+ if (adaptor_type != DRM_DP_DUAL_MODE_LSPCON) {
+ DRM_DEBUG_KMS("No LSPCON detected, found %s\n",
+ drm_dp_get_dual_mode_type_name(adaptor_type));
+ return false;
+ }
+
+ /* Yay ... got a LSPCON device */
+ DRM_DEBUG_KMS("LSPCON detected\n");
+ return true;
+}
+
+enum drm_lspcon_mode lspcon_probe(struct intel_lspcon *lspcon)
+{
+
+ /* Detect a valid lspcon adaptor */
+ if (!lspcon_detect_identifier(lspcon)) {
+ DRM_DEBUG_KMS("No LSPCON identifier found\n");
+ return false;
+ }
+
+ /* Get LSPCON's mode of operation */
+ lspcon->mode_of_op = lspcon_get_current_mode(lspcon);
+ lspcon->active = true;
+ return true;
+}
+
+bool lspcon_init(struct intel_digital_port *intel_dig_port)
+{
+ struct intel_dp *dp = &intel_dig_port->dp;
+ struct intel_lspcon *lspcon = &intel_dig_port->lspcon;
+ struct drm_device *dev = intel_dig_port->base.base.dev;
+
+ if (!IS_GEN9(dev)) {
+ DRM_ERROR("LSPCON is supported on GEN9 only\n");
+ return false;
+ }
+
+ lspcon->active = false;
+ lspcon->mode_of_op = DRM_LSPCON_MODE_INVALID;
+ lspcon->aux = &dp->aux;
+
+ if (!lspcon_probe(lspcon)) {
+ DRM_ERROR("Failed to probe lspcon\n");
+ return false;
+ }
+
+ /*
+ * In the SW state machine, lets Put LSPCON in PCON mode only.
+ * In this way, it will work with both HDMI 1.4 sinks as well as HDMI
+ * 2.0 sinks.
+ */
+ if (lspcon->active && lspcon->mode_of_op != DRM_LSPCON_MODE_PCON) {
+ if (lspcon_change_mode(lspcon, DRM_LSPCON_MODE_PCON,
+ true) < 0) {
+ DRM_ERROR("LSPCON mode change to PCON failed\n");
+ return false;
+ }
+ }
+
+ DRM_DEBUG_KMS("Success: LSPCON init\n");
+ return true;
+}
--
1.9.1