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drm/i915: set the correct eDP aux channel clock divider on DDI

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The cdclk frequency is not always the same, so the value here should
be adjusted to match it.

Version 2: call intel_ddi_get_cdclk_freq instead of reading
CDCLK_FREQ, because the register is just for earlier HW steppings.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Paulo Zanoni 2012-10-23 18:30:05 -02:00 committed by Daniel Vetter
parent e6f0bfc4fb
commit b8fc2f6a18
3 changed files with 5 additions and 2 deletions
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2
drivers/gpu/drm/i915/intel_ddi.c
View file

@ -1239,7 +1239,7 @@ void intel_disable_ddi(struct intel_encoder *encoder)
/* This will be needed in the future, so leave it here for now */
}
static int intel_ddi_get_cdclk_freq(struct drm_i915_private *dev_priv)
int intel_ddi_get_cdclk_freq(struct drm_i915_private *dev_priv)
{
if (I915_READ(HSW_FUSE_STRAP) & HSW_CDCLK_LIMIT)
return 450;

4
drivers/gpu/drm/i915/intel_dp.c
View file

@ -370,7 +370,9 @@ intel_dp_aux_ch(struct intel_dp *intel_dp,
* clock divider.
*/
if (is_cpu_edp(intel_dp)) {
if (IS_VALLEYVIEW(dev))
if (IS_HASWELL(dev))
aux_clock_divider = intel_ddi_get_cdclk_freq(dev_priv) >> 1;
else if (IS_VALLEYVIEW(dev))
aux_clock_divider = 100;
else if (IS_GEN6(dev) || IS_GEN7(dev))
aux_clock_divider = 200; /* SNB & IVB eDP input clock at 400Mhz */

1
drivers/gpu/drm/i915/intel_drv.h
View file

@ -608,6 +608,7 @@ extern bool intel_ddi_get_hw_state(struct intel_encoder *encoder,
extern void intel_ddi_mode_set(struct drm_encoder *encoder,
struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode);
extern int intel_ddi_get_cdclk_freq(struct drm_i915_private *dev_priv);
extern void intel_ddi_pll_init(struct drm_device *dev);
extern void intel_ddi_enable_pipe_func(struct drm_crtc *crtc);
extern void intel_ddi_disable_transcoder_func(struct drm_i915_private *dev_priv,