drm/i915/backlight: Check Luminance based brightness control for VESA

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Check if we are capable of controlling brightness via luminance
which is dependent on PANEL_LUMINANCE_CONTROL_CAPABLE bit being set
on EDP_GENERAL_CAPABILITY_2 register.

--v2
-Prefer using luminance rather than nits [Jani]
-Fix commit message

--v3
-Fix the bit name used in commit message [Arun]
-Use correct edp_dpcd[] to check the capability [Arun]

Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Tested-by: Ben Kao <ben.kao@intel.com>
Reviewed-by: Arun R Murthy <arun.r.murthy@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250206063253.2827017-5-suraj.kandpal@intel.com

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This commit is contained in:

Suraj Kandpal 2025-02-06 12:02:49 +05:30

parent 9535c6a4c6

commit 6448149792

2 changed files with 10 additions and 0 deletions

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1

drivers/gpu/drm/i915/display/intel_display_types.h

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9

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

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