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drm/i915/backlight: Enable nits based luminance

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Enable nits based luminance by writing the PANEL_LUMINANCE_CONTROL
bit and set the correct register to change brightness.

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/20250206063253.2827017-9-suraj.kandpal@intel.com
This commit is contained in:
Suraj Kandpal
2025-02-06 12:02:53 +05:30
parent 8d502933ac
commit a5efc8dcfe
1 changed files with 15 additions and 0 deletions
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15
drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
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@@ -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)