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drm/dp: Add documentation for luminance_set

Documentation for luminance_set for struct drm_edp_backlight_info
was missed which causes warnings.

Fixes: 2af612ad4290 ("drm/dp: Introduce new member in drm_backlight_info")
Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Arun R Murthy <arun.r.murthy@gmail.com>
Link: https://lore.kernel.org/r/20250701085054.746408-1-suraj.kandpal@intel.com

Suraj Kandpal b4cd18f4 12853b27

+1
+1
include/drm/display/drm_dp_helper.h
··· 837 837 * @lsb_reg_used: Do we also write values to the DP_EDP_BACKLIGHT_BRIGHTNESS_LSB register? 838 838 * @aux_enable: Does the panel support the AUX enable cap? 839 839 * @aux_set: Does the panel support setting the brightness through AUX? 840 + * @luminance_set: Does the panel support setting the brightness through AUX using luminance values? 840 841 * 841 842 * This structure contains various data about an eDP backlight, which can be populated by using 842 843 * drm_edp_backlight_init().