[Intel-gfx] [PATCH v2 0/2] DP audio fixes

[Dhinakaran Pandiyan]

Playing audio over DP MST or just enabling it during boot caused underruns
on BDW and SKL. The underruns are followed by displays cycling on-off.
Debugging the underruns led to the understanding this was not a MST
specific issue but specific to the HBR2 configuration. There are two
solutions depending on the platform:

a) BDW - Increase the cdclk to at least 432 MHz in DP HBR2, x4 configs.
b) SKL, BXT and KBL - Enable DP stall fix (increasing the cdclk works
too).

I have tested this only on SKL and it would be great if somebody else can
share the results for other platforms.

Dhinakaran Pandiyan (2):
  drm/i915/dp: Enable DP audio stall fix for gen9 platforms
  drm/i915/dp: BDW cdclk fix for DP audio

 drivers/gpu/drm/i915/i915_reg.h      |  5 +++++
 drivers/gpu/drm/i915/intel_ddi.c     | 38 ++++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/intel_display.c | 28 +++++++++++++++++++++++---
 drivers/gpu/drm/i915/intel_drv.h     |  2 ++
 4 files changed, 70 insertions(+), 3 deletions(-)

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2.7.4