drm/i915/cnl: apply Display WA #1178 to fix type C dongles

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Display WA #1178 is meant to fix Aux channel voltage swing too low with
some type C dongles. Although it is for type C, HW engineers reported
that it can be applied to all external ports even if they are not going
to type C.

For CNL we apply the workaround every time Aux B, C and D are powering
up since they will lose the configuration when powered down.

v2: Use common tag for WA

Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Arthur J Runyan <arthur.j.runyan@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171128220553.22435-1-lucas.demarchi@intel.com

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Lucas De Marchi 2017-11-28 14:05:53 -08:00 • committed by Rodrigo Vivi

parent 1edf6958c1

commit ddd39e4b3f

2 changed files with 20 additions and 0 deletions

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11

drivers/gpu/drm/i915/i915_reg.h

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9

drivers/gpu/drm/i915/intel_runtime_pm.c

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