[Intel-gfx] [PATCH 1/2] drm/i915: Fix HDMI 12bpc and pixel repeat clock readout for DDI platforms

[ville.syrjala at linux.intel.com]

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

Take the HDMI 12bpc mode and pixel repeat into account when extracting
the dotclock from the hardware on DDI platforms.

Tested on HSW only.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_ddi.c | 49 ++++++++++++++++++++--------------------
 1 file changed, 24 insertions(+), 25 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 31b29e8..56742f9 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -855,6 +855,26 @@ static int skl_calc_wrpll_link(struct drm_i915_private *dev_priv,
 	return dco_freq / (p0 * p1 * p2 * 5);
 }
 
+static void ddi_dotclock_get(struct intel_crtc_state *pipe_config)
+{
+	int dotclock;
+
+	if (pipe_config->has_pch_encoder)
+		dotclock = intel_dotclock_calculate(pipe_config->port_clock,
+						    &pipe_config->fdi_m_n);
+	else if (pipe_config->has_dp_encoder)
+		dotclock = intel_dotclock_calculate(pipe_config->port_clock,
+						    &pipe_config->dp_m_n);
+	else if (pipe_config->has_hdmi_sink && pipe_config->pipe_bpp == 36)
+		dotclock = pipe_config->port_clock * 2 / 3;
+	else
+		dotclock = pipe_config->port_clock;
+
+	if (pipe_config->pixel_multiplier)
+		dotclock /= pipe_config->pixel_multiplier;
+
+	pipe_config->base.adjusted_mode.crtc_clock = dotclock;
+}
 
 static void skl_ddi_clock_get(struct intel_encoder *encoder,
 				struct intel_crtc_state *pipe_config)
@@ -901,12 +921,7 @@ static void skl_ddi_clock_get(struct intel_encoder *encoder,
 
 	pipe_config->port_clock = link_clock;
 
-	if (pipe_config->has_dp_encoder)
-		pipe_config->base.adjusted_mode.crtc_clock =
-			intel_dotclock_calculate(pipe_config->port_clock,
-						 &pipe_config->dp_m_n);
-	else
-		pipe_config->base.adjusted_mode.crtc_clock = pipe_config->port_clock;
+	ddi_dotclock_get(pipe_config);
 }
 
 static void hsw_ddi_clock_get(struct intel_encoder *encoder,
@@ -953,16 +968,7 @@ static void hsw_ddi_clock_get(struct intel_encoder *encoder,
 
 	pipe_config->port_clock = link_clock * 2;
 
-	if (pipe_config->has_pch_encoder)
-		pipe_config->base.adjusted_mode.crtc_clock =
-			intel_dotclock_calculate(pipe_config->port_clock,
-						 &pipe_config->fdi_m_n);
-	else if (pipe_config->has_dp_encoder)
-		pipe_config->base.adjusted_mode.crtc_clock =
-			intel_dotclock_calculate(pipe_config->port_clock,
-						 &pipe_config->dp_m_n);
-	else
-		pipe_config->base.adjusted_mode.crtc_clock = pipe_config->port_clock;
+	ddi_dotclock_get(pipe_config);
 }
 
 static int bxt_calc_pll_link(struct drm_i915_private *dev_priv,
@@ -979,16 +985,9 @@ static void bxt_ddi_clock_get(struct intel_encoder *encoder,
 	enum port port = intel_ddi_get_encoder_port(encoder);
 	uint32_t dpll = port;
 
-	pipe_config->port_clock =
-		bxt_calc_pll_link(dev_priv, dpll);
+	pipe_config->port_clock = bxt_calc_pll_link(dev_priv, dpll);
 
-	if (pipe_config->has_dp_encoder)
-		pipe_config->base.adjusted_mode.crtc_clock =
-			intel_dotclock_calculate(pipe_config->port_clock,
-							&pipe_config->dp_m_n);
-	else
-		pipe_config->base.adjusted_mode.crtc_clock =
-							pipe_config->port_clock;
+	ddi_dotclock_get(pipe_config);
 }
 
 void intel_ddi_clock_get(struct intel_encoder *encoder,
-- 
2.3.6