drm/i915: Implement display w/a #1143

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Apparently SKL/KBL/CFL need some manual help to get the
programmed HDMI vswing to stick. Implement the relevant
workaround (display w/a #1143).

Note that the relevant chicken bits live in a transcoder register
even though the bits affect a specific DDI port rather than a
specific transcoder. Hence we must pick the correct transcoder
register instance based on the port rather than based on the
cpu_transcoder.

Also note that for completeness I included support for DDI A/E
in the code even though we never have HDMI on those ports.

v2: CFL needs the w/a as well (Rodrigo and Art)

Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Art Runyan <arthur.j.runyan@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180122174131.28046-1-ville.syrjala@linux.intel.com
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

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This commit is contained in:

Ville Syrjälä 2018-01-22 19:41:31 +02:00

parent c19e1124e7

commit 0519c102f5

2 changed files with 48 additions and 2 deletions

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8

drivers/gpu/drm/i915/i915_reg.h

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42

drivers/gpu/drm/i915/intel_ddi.c

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