From: Suraj Kandpal Date: Thu, 6 Feb 2025 06:32:53 +0000 (+0530) Subject: drm/i915/backlight: Enable nits based luminance X-Git-Tag: v6.15-rc1~120^2~16^2~114 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=a5efc8dcfe710fd63a0557d3512e8ff753c2e283;p=thirdparty%2Fkernel%2Flinux.git drm/i915/backlight: Enable nits based luminance Enable nits based luminance by writing the PANEL_LUMINANCE_CONTROL bit and set the correct register to change brightness. Signed-off-by: Suraj Kandpal Tested-by: Ben Kao Reviewed-by: Arun R Murthy Link: https://patchwork.freedesktop.org/patch/msgid/20250206063253.2827017-9-suraj.kandpal@intel.com --- diff --git a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c index 301a4dfdfbe5f..f53c8355d5bea 100644 --- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c +++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c @@ -527,6 +527,18 @@ intel_dp_aux_vesa_enable_backlight(const struct intel_crtc_state *crtc_state, struct intel_connector *connector = to_intel_connector(conn_state->connector); struct intel_panel *panel = &connector->panel; struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder); + int ret; + + if (panel->backlight.edp.vesa.luminance_control_support) { + ret = drm_dp_dpcd_writeb(&intel_dp->aux, DP_EDP_BACKLIGHT_MODE_SET_REGISTER, + DP_EDP_PANEL_LUMINANCE_CONTROL_ENABLE); + + if (ret == 1) + return; + + if (!intel_dp_aux_vesa_set_luminance(connector, level)) + return; + } if (!panel->backlight.edp.vesa.info.aux_enable) { u32 pwm_level; @@ -550,6 +562,9 @@ static void intel_dp_aux_vesa_disable_backlight(const struct drm_connector_state struct intel_panel *panel = &connector->panel; struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder); + if (panel->backlight.edp.vesa.luminance_control_support) + return; + drm_edp_backlight_disable(&intel_dp->aux, &panel->backlight.edp.vesa.info); if (!panel->backlight.edp.vesa.info.aux_enable)