drm/i915: Pick the backlight controller based on VBT on ICP+

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Use the second backlight controller on ICP+ if the VBT asks
us to do so.

On pre-MTP we also check the chicken bit to make sure the
pins have been correctly muxed by the firmware.

Cc: stable@vger.kernel.org
Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/8016
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230207064337.18697-4-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
(cherry picked from commit b337715463)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

...

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Ville Syrjälä 2023-02-07 08:43:37 +02:00 • committed by Jani Nikula

parent 14e591a193

commit c90b155148

1 changed files with 31 additions and 3 deletions

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34

drivers/gpu/drm/i915/display/intel_backlight.c

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