drm/i915: Hack to tie both common lanes together on chv

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It looks like frobbing the cmnreset line on pne PHY disturbs the other
PHY on chv. The result is a black screen. On HDMI it's just a flash of
black, but DP usually falls over and can't get back up.

As a workaround set up the power domains so that both common lane
wells power up and down together. I also tried leaving the cmnreset
deasserted even the if the power well goes down but that didn't seem
acceptable to the PHY.

Reviewed-by: Rafael Barbalho <rafael.barbalho@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

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Ville Syrjälä 2014-06-27 19:49:57 +03:00 • committed by Daniel Vetter

parent 3c2777fd2f

commit 3dd7b97458

1 changed files with 12 additions and 2 deletions

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drivers/gpu/drm/i915/intel_pm.c

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