[PATCH v4] drm/i915: Fix port_clock and adjusted_mode.clock readout all over

ville.syrjala
2013-09-13T13:00:17Z

From: Ville Syrjälä <ville.syrjala@linux.intel.com>

Now that adjusted_mode.clock no longer contains the pixel_multiplier, we
can kill the get_clock() callback and instead do the clock readout
in get_pipe_config().

Also i9xx_crtc_clock_get() can now extract the frequency of the PCH
DPLL, so use it to populate port_clock accurately for PCH encoders.
For DP in port A the encoder is still responsible for filling in
port_clock. The FDI adjusted_mode.clock extraction is kept in place
for some extra sanity checking, but we no longer need to pretend it's
also the port_clock.

In the encoder get_config() functions fill out adjusted_mode.clock
based on port_clock and other details such as the DP M/N values,
HDMI 12bpc and SDVO pixel_multiplier. For PCH encoders we will then
do an extra sanity check to make sure the dotclock we derived from
the FDI configuratiuon matches the one we derive from port_clock.

DVO doesn't exist on PCH platforms, so it doesn't need to anything
but assign adjusted_mode.clock=port_clock. And DDI is HSW only, so
none of the changes apply there.

v2: Use hdmi_reg color format to detect 12bpc HDMI case
v3: Set adjusted_mode.clock for LVDS too
v4: Rename ironlake_crtc_clock_get to ironlake_pch_clock_get,
eliminate the useless link_freq variable.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
drivers/gpu/drm/i915/i915_drv.h | 1 -
drivers/gpu/drm/i915/i915_reg.h | 1 +
drivers/gpu/drm/i915/intel_crt.c | 8 ++++
drivers/gpu/drm/i915/intel_display.c | 74 ++++++++++++++++++------------------
drivers/gpu/drm/i915/intel_dp.c | 11 +++++-
drivers/gpu/drm/i915/intel_drv.h | 2 +
drivers/gpu/drm/i915/intel_dvo.c | 2 +
drivers/gpu/drm/i915/intel_hdmi.c | 11 ++++++
drivers/gpu/drm/i915/intel_lvds.c | 8 ++++
drivers/gpu/drm/i915/intel_sdvo.c | 8 ++++
10 files changed, 86 insertions(+), 40 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 7caf71d..8b16d47 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -371,7 +371,6 @@ struct drm_i915_display_funcs {
* fills out the pipe-config with the hw state. */
bool (*get_pipe_config)(struct intel_crtc *,
struct intel_crtc_config *);
- void (*get_clock)(struct intel_crtc *, struct intel_crtc_config *);
int (*crtc_mode_set)(struct drm_crtc *crtc,
int x, int y,
struct drm_framebuffer *old_fb);
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index bcee89b..384adfb 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -2071,6 +2071,7 @@

/* Gen 4 SDVO/HDMI bits: */
#define SDVO_COLOR_FORMAT_8bpc (0 << 26)
+#define SDVO_COLOR_FORMAT_MASK (7 << 26)
#define SDVO_ENCODING_SDVO (0 << 10)
#define SDVO_ENCODING_HDMI (2 << 10)
#define HDMI_MODE_SELECT_HDMI (1 << 9) /* HDMI only */
diff --git a/drivers/gpu/drm/i915/intel_crt.c b/drivers/gpu/drm/i915/intel_crt.c
index f5f89c3..6f101d5 100644
--- a/drivers/gpu/drm/i915/intel_crt.c
+++ b/drivers/gpu/drm/i915/intel_crt.c
@@ -89,6 +89,7 @@ static void intel_crt_get_config(struct intel_encoder *encoder,
struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
struct intel_crt *crt = intel_encoder_to_crt(encoder);
u32 tmp, flags = 0;
+ int dotclock;

tmp = I915_READ(crt->adpa_reg);

@@ -103,6 +104,13 @@ static void intel_crt_get_config(struct intel_encoder *encoder,
flags |= DRM_MODE_FLAG_NVSYNC;

pipe_config->adjusted_mode.flags |= flags;
+
+ dotclock = pipe_config->port_clock;
+
+ if (HAS_PCH_SPLIT(dev_priv->dev))
+ ironlake_check_encoder_dotclock(pipe_config, dotclock);
+
+ pipe_config->adjusted_mode.clock = dotclock;
}

/* Note: The caller is required to filter out dpms modes not supported by the
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index fed3804..42c7dc6 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -47,8 +47,8 @@ static void intel_crtc_update_cursor(struct drm_crtc *crtc, bool on);

static void i9xx_crtc_clock_get(struct intel_crtc *crtc,
struct intel_crtc_config *pipe_config);
-static void ironlake_crtc_clock_get(struct intel_crtc *crtc,
- struct intel_crtc_config *pipe_config);
+static void ironlake_pch_clock_get(struct intel_crtc *crtc,
+ struct intel_crtc_config *pipe_config);

static int intel_set_mode(struct drm_crtc *crtc, struct drm_display_mode *mode,
int x, int y, struct drm_framebuffer *old_fb);
@@ -5045,6 +5045,8 @@ static bool i9xx_get_pipe_config(struct intel_crtc *crtc,
DPLL_PORTB_READY_MASK);
}

+ i9xx_crtc_clock_get(crtc, pipe_config);
+
return true;
}

@@ -6004,6 +6006,8 @@ static bool ironlake_get_pipe_config(struct intel_crtc *crtc,
pipe_config->pixel_multiplier =
((tmp & PLL_REF_SDVO_HDMI_MULTIPLIER_MASK)
>> PLL_REF_SDVO_HDMI_MULTIPLIER_SHIFT) + 1;
+
+ ironlake_pch_clock_get(crtc, pipe_config);
} else {
pipe_config->pixel_multiplier = 1;
}
@@ -7411,7 +7415,12 @@ static void i9xx_crtc_clock_get(struct intel_crtc *crtc,
i9xx_clock(refclk, &clock);
}

- pipe_config->adjusted_mode.clock = clock.dot;
+ /*
+ * This value includes pixel_multiplier. We will use
+ * port_clock to compute adjusted_mode.clock in the
+ * encoder's get_config() function.
+ */
+ pipe_config->port_clock = clock.dot;
}

int intel_dotclock_calculate(int link_freq,
@@ -7433,31 +7442,23 @@ int intel_dotclock_calculate(int link_freq,
return div_u64((u64)m_n->link_m * link_freq, m_n->link_n);
}

-static void ironlake_crtc_clock_get(struct intel_crtc *crtc,
- struct intel_crtc_config *pipe_config)
+static void ironlake_pch_clock_get(struct intel_crtc *crtc,
+ struct intel_crtc_config *pipe_config)
{
struct drm_device *dev = crtc->base.dev;
- int link_freq;
+
+ /* read out port_clock from the DPLL */
+ i9xx_crtc_clock_get(crtc, pipe_config);

/*
- * We need to get the FDI or DP link clock here to derive
- * the M/N dividers.
- *
- * For FDI, we read it from the BIOS or use a fixed 2.7GHz.
- * For DP, it's either 1.62GHz or 2.7GHz.
- * We do our calculations in 10*MHz since we don't need much precison.
+ * This value does not include pixel_multiplier.
+ * We will check that port_clock and adjusted_mode.clock
+ * agree once we know their relationship in the encoder's
+ * get_config() function.
*/
- if (pipe_config->has_pch_encoder) {
- link_freq = intel_fdi_link_freq(dev) * 10000;
-
- pipe_config->adjusted_mode.clock =
- intel_dotclock_calculate(link_freq, &pipe_config->fdi_m_n);
- } else {
- link_freq = pipe_config->port_clock;
-
- pipe_config->adjusted_mode.clock =
- intel_dotclock_calculate(link_freq, &pipe_config->dp_m_n);
- }
+ pipe_config->adjusted_mode.clock =
+ intel_dotclock_calculate(intel_fdi_link_freq(dev) * 10000,
+ &pipe_config->fdi_m_n);
}

/** Returns the currently programmed mode of the given pipe. */
@@ -8873,9 +8874,6 @@ check_crtc_state(struct drm_device *dev)
encoder->get_config(encoder, &pipe_config);
}

- if (dev_priv->display.get_clock)
- dev_priv->display.get_clock(crtc, &pipe_config);
-
WARN(crtc->active != active,
"crtc active state doesn't match with hw state "
"(expected %i, found %i)\n", crtc->active, active);
@@ -8950,6 +8948,18 @@ intel_modeset_check_state(struct drm_device *dev)
check_shared_dpll_state(dev);
}

+void ironlake_check_encoder_dotclock(const struct intel_crtc_config *pipe_config,
+ int dotclock)
+{
+ /*
+ * FDI already provided one idea for the dotclock.
+ * Yell if the encoder disagrees.
+ */
+ WARN(!intel_fuzzy_clock_check(pipe_config->adjusted_mode.clock, dotclock),
+ "FDI dotclock and encoder dotclock mismatch, fdi: %i, encoder: %i\n",
+ pipe_config->adjusted_mode.clock, dotclock);
+}
+
static int __intel_set_mode(struct drm_crtc *crtc,
struct drm_display_mode *mode,
int x, int y, struct drm_framebuffer *fb)
@@ -9901,7 +9911,6 @@ static void intel_init_display(struct drm_device *dev)
dev_priv->display.update_plane = ironlake_update_plane;
} else if (HAS_PCH_SPLIT(dev)) {
dev_priv->display.get_pipe_config = ironlake_get_pipe_config;
- dev_priv->display.get_clock = ironlake_crtc_clock_get;
dev_priv->display.crtc_mode_set = ironlake_crtc_mode_set;
dev_priv->display.crtc_enable = ironlake_crtc_enable;
dev_priv->display.crtc_disable = ironlake_crtc_disable;
@@ -9909,7 +9918,6 @@ static void intel_init_display(struct drm_device *dev)
dev_priv->display.update_plane = ironlake_update_plane;
} else if (IS_VALLEYVIEW(dev)) {
dev_priv->display.get_pipe_config = i9xx_get_pipe_config;
- dev_priv->display.get_clock = i9xx_crtc_clock_get;
dev_priv->display.crtc_mode_set = i9xx_crtc_mode_set;
dev_priv->display.crtc_enable = valleyview_crtc_enable;
dev_priv->display.crtc_disable = i9xx_crtc_disable;
@@ -9917,7 +9925,6 @@ static void intel_init_display(struct drm_device *dev)
dev_priv->display.update_plane = i9xx_update_plane;
} else {
dev_priv->display.get_pipe_config = i9xx_get_pipe_config;
- dev_priv->display.get_clock = i9xx_crtc_clock_get;
dev_priv->display.crtc_mode_set = i9xx_crtc_mode_set;
dev_priv->display.crtc_enable = i9xx_crtc_enable;
dev_priv->display.crtc_disable = i9xx_crtc_disable;
@@ -10536,15 +10543,6 @@ static void intel_modeset_readout_hw_state(struct drm_device *dev)
pipe);
}

- list_for_each_entry(crtc, &dev->mode_config.crtc_list,
- base.head) {
- if (!crtc->active)
- continue;
- if (dev_priv->display.get_clock)
- dev_priv->display.get_clock(crtc,
- &crtc->config);
- }
-
list_for_each_entry(connector, &dev->mode_config.connector_list,
base.head) {
if (connector->get_hw_state(connector)) {
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 9ba697c..a7fa6fd 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1417,6 +1417,7 @@ static void intel_dp_get_config(struct intel_encoder *encoder,
struct drm_i915_private *dev_priv = dev->dev_private;
enum port port = dp_to_dig_port(intel_dp)->port;
struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
+ int dotclock;

if ((port == PORT_A) || !HAS_PCH_CPT(dev)) {
tmp = I915_READ(intel_dp->output_reg);
@@ -1448,12 +1449,20 @@ static void intel_dp_get_config(struct intel_encoder *encoder,

intel_dp_get_m_n(crtc, pipe_config);

- if (dp_to_dig_port(intel_dp)->port == PORT_A) {
+ if (port == PORT_A) {
if ((I915_READ(DP_A) & DP_PLL_FREQ_MASK) == DP_PLL_FREQ_160MHZ)
pipe_config->port_clock = 162000;
else
pipe_config->port_clock = 270000;
}
+
+ dotclock = intel_dotclock_calculate(pipe_config->port_clock,
+ &pipe_config->dp_m_n);
+
+ if (HAS_PCH_SPLIT(dev_priv->dev) && port != PORT_A)
+ ironlake_check_encoder_dotclock(pipe_config, dotclock);
+
+ pipe_config->adjusted_mode.clock = dotclock;
}

static bool is_edp_psr(struct intel_dp *intel_dp)
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 6b97ac1..338222c 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -807,5 +807,7 @@ extern void intel_dp_get_m_n(struct intel_crtc *crtc,
struct intel_crtc_config *pipe_config);
extern int intel_dotclock_calculate(int link_freq,
const struct intel_link_m_n *m_n);
+extern void ironlake_check_encoder_dotclock(const struct intel_crtc_config *pipe_config,
+ int dotclock);

#endif /* __INTEL_DRV_H__ */
diff --git a/drivers/gpu/drm/i915/intel_dvo.c b/drivers/gpu/drm/i915/intel_dvo.c
index 55cec38..ff86c36 100644
--- a/drivers/gpu/drm/i915/intel_dvo.c
+++ b/drivers/gpu/drm/i915/intel_dvo.c
@@ -153,6 +153,8 @@ static void intel_dvo_get_config(struct intel_encoder *encoder,
flags |= DRM_MODE_FLAG_NVSYNC;

pipe_config->adjusted_mode.flags |= flags;
+
+ pipe_config->adjusted_mode.clock = pipe_config->port_clock;
}

static void intel_disable_dvo(struct intel_encoder *encoder)
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index 70c716e..17b2d7e 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -713,6 +713,7 @@ static void intel_hdmi_get_config(struct intel_encoder *encoder,
struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&encoder->base);
struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
u32 tmp, flags = 0;
+ int dotclock;

tmp = I915_READ(intel_hdmi->hdmi_reg);

@@ -727,6 +728,16 @@ static void intel_hdmi_get_config(struct intel_encoder *encoder,
flags |= DRM_MODE_FLAG_NVSYNC;

pipe_config->adjusted_mode.flags |= flags;
+
+ if ((tmp & SDVO_COLOR_FORMAT_MASK) == HDMI_COLOR_FORMAT_12bpc)
+ dotclock = pipe_config->port_clock * 2 / 3;
+ else
+ dotclock = pipe_config->port_clock;
+
+ if (HAS_PCH_SPLIT(dev_priv->dev))
+ ironlake_check_encoder_dotclock(pipe_config, dotclock);
+
+ pipe_config->adjusted_mode.clock = dotclock;
}

static void intel_enable_hdmi(struct intel_encoder *encoder)
diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
index 831a5c0..05e5485 100644
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -92,6 +92,7 @@ static void intel_lvds_get_config(struct intel_encoder *encoder,
struct drm_device *dev = encoder->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
u32 lvds_reg, tmp, flags = 0;
+ int dotclock;

if (HAS_PCH_SPLIT(dev))
lvds_reg = PCH_LVDS;
@@ -116,6 +117,13 @@ static void intel_lvds_get_config(struct intel_encoder *encoder,

pipe_config->gmch_pfit.control |= tmp & PANEL_8TO6_DITHER_ENABLE;
}
+
+ dotclock = pipe_config->port_clock;
+
+ if (HAS_PCH_SPLIT(dev_priv->dev))
+ ironlake_check_encoder_dotclock(pipe_config, dotclock);
+
+ pipe_config->adjusted_mode.clock = dotclock;
}

/* The LVDS pin pair needs to be on before the DPLLs are enabled.
diff --git a/drivers/gpu/drm/i915/intel_sdvo.c b/drivers/gpu/drm/i915/intel_sdvo.c
index ebfd513..91aea9e 100644
--- a/drivers/gpu/drm/i915/intel_sdvo.c
+++ b/drivers/gpu/drm/i915/intel_sdvo.c
@@ -1325,6 +1325,7 @@ static void intel_sdvo_get_config(struct intel_encoder *encoder,
struct intel_sdvo *intel_sdvo = to_sdvo(encoder);
struct intel_sdvo_dtd dtd;
int encoder_pixel_multiplier = 0;
+ int dotclock;
u32 flags = 0, sdvox;
u8 val;
bool ret;
@@ -1363,6 +1364,13 @@ static void intel_sdvo_get_config(struct intel_encoder *encoder,
>> SDVO_PORT_MULTIPLY_SHIFT) + 1;
}

+ dotclock = pipe_config->port_clock / pipe_config->pixel_multiplier;
+
+ if (HAS_PCH_SPLIT(dev))
+ ironlake_check_encoder_dotclock(pipe_config, dotclock);
+
+ pipe_config->adjusted_mode.clock = dotclock;
+
/* Cross check the port pixel multiplier with the sdvo encoder state. */
if (intel_sdvo_get_value(intel_sdvo, SDVO_CMD_GET_CLOCK_RATE_MULT,
&val, 1)) {
--
1.8.1.5