From ba02bf8e868a07163cd1518930181f849f37a752 Mon Sep 17 00:00:00 2001 From: Suraj Kandpal Date: Fri, 20 Jun 2025 12:04:42 +0530 Subject: [PATCH 4241/5403] drm/dp: Enable backlight control using luminance Add flag to enable brightness control via luminance value when enabling edp backlight. Signed-off-by: Suraj Kandpal Reviewed-by: Arun R Murthy Link: https://lore.kernel.org/r/20250620063445.3603086-11-suraj.kandpal@intel.com --- drivers/gpu/drm/display/drm_dp_helper.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/display/drm_dp_helper.c b/drivers/gpu/drm/display/drm_dp_helper.c index f30a041ec29b..e46c9dfc9753 100644 --- a/drivers/gpu/drm/display/drm_dp_helper.c +++ b/drivers/gpu/drm/display/drm_dp_helper.c @@ -4038,6 +4038,9 @@ int drm_edp_backlight_enable(struct drm_dp_aux *aux, const struct drm_edp_backli else dpcd_buf = DP_EDP_BACKLIGHT_CONTROL_MODE_PWM; + if (bl->luminance_set) + dpcd_buf |= DP_EDP_PANEL_LUMINANCE_CONTROL_ENABLE; + if (bl->pwmgen_bit_count) { ret = drm_dp_dpcd_write_byte(aux, DP_EDP_PWMGEN_BIT_COUNT, bl->pwmgen_bit_count); if (ret < 0) -- 2.54.0