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drm/dp: Introduce new member in drm_backlight_info

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Introduce luminance_set flag which indicates if we can manipulate
backlight using luminance value or not which is only possible
after eDP v1.5.

Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Arun R Murthy <arun.r.murthy@intel.com>
Link: https://lore.kernel.org/r/20250620063445.3603086-2-suraj.kandpal@intel.com
This commit is contained in:
Suraj Kandpal 2025-06-20 12:04:33 +05:30
parent 026a60e3c1
commit 2af612ad42
2 changed files with 7 additions and 2 deletions
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8
drivers/gpu/drm/display/drm_dp_helper.c
View file

@ -4261,11 +4261,15 @@ drm_edp_backlight_init(struct drm_dp_aux *aux, struct drm_edp_backlight_info *bl
bl->aux_set = true;
if (edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_BYTE_COUNT)
bl->lsb_reg_used = true;
if ((edp_dpcd[0] & DP_EDP_15) && edp_dpcd[3] &
(DP_EDP_PANEL_LUMINANCE_CONTROL_CAPABLE))
bl->luminance_set = true;
/* Sanity check caps */
if (!bl->aux_set && !(edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP)) {
if (!bl->aux_set && !(edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP) &&
!bl->luminance_set) {
drm_dbg_kms(aux->drm_dev,
"%s: Panel supports neither AUX or PWM brightness control? Aborting\n",
"%s: Panel does not support AUX, PWM or luminance-based brightness control. Aborting\n",
aux->name);
return -EINVAL;
}

1
include/drm/display/drm_dp_helper.h
View file

@ -849,6 +849,7 @@ struct drm_edp_backlight_info {
bool lsb_reg_used : 1;
bool aux_enable : 1;
bool aux_set : 1;
bool luminance_set : 1;
};
int