drm/i915: Retry DP aux_ch communications with a different clock after failure

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The w/a db makes the recommendation to both use a non-default value for
the initial clock and then to retry with an alternative clock for
Haswell with the Lakeport PCH.

"On LPT:H, use a divider value of 63 decimal (03Fh). If there is a
failure, retry at least three times with 63, then retry at least three
times with 72 decimal (048h)."

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

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Chris Wilson 2013-07-21 16:00:03 +01:00 • committed by Daniel Vetter

parent b8f102e8bf

commit bc86625a4f

1 changed files with 51 additions and 41 deletions

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drivers/gpu/drm/i915/intel_dp.c

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