Create a function that fills in the value for
PANEL_TARGET_LUMINANCE_VALUE which helps in changing the brightness in
NITS using VESA interface.
Signed-off-by: Suraj Kandpal <suraj.kandpal@xxxxxxxxx>
---
.../drm/i915/display/intel_dp_aux_backlight.c | 29 +++++++++++++++++++
1 file changed, 29 insertions(+)
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 ac9a69fe3f10..d794397656dd 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
@@ -474,6 +474,30 @@ static u32 intel_dp_aux_vesa_get_backlight(struct intel_connector *connector, en
return connector->panel.backlight.level;
}
+static int
+intel_dp_aux_vesa_set_nits_brightness(struct intel_connector *connector, u32 level)
+{
+ struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);
+ u8 buf[3];
+ int ret;
+
+ level = level * 1000;
+ level &= 0xffffff;
+ buf[0] = (level & 0x0000ff);
+ buf[1] = (level & 0x00ff00) >> 8;
+ buf[2] = (level & 0xff0000) >> 16;
+
+ ret = drm_dp_dpcd_write(&intel_dp->aux, DP_EDP_PANEL_TARGET_LUMINANCE_VALUE, buf, sizeof(buf));
+ if (ret != sizeof(buf)) {
+ drm_err(intel_dp->aux.drm_dev,
+ "%s: Failed to VESA AUX Nits backlight level: %d\n",
+ intel_dp->aux.name, ret);
+ return -EINVAL;
+ } else {
+ return 0;
+ }
+}
+
static void
intel_dp_aux_vesa_set_backlight(const struct drm_connector_state *conn_state, u32 level)
{
@@ -481,6 +505,11 @@ intel_dp_aux_vesa_set_backlight(const struct drm_connector_state *conn_state, u3
struct intel_panel *panel = &connector->panel;
struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);
+ if (panel->backlight.edp.vesa.nits_support) {
+ if (!intel_dp_aux_vesa_set_nits_brightness(connector, level))
+ return;
+ }
+
if (!panel->backlight.edp.vesa.info.aux_set) {
const u32 pwm_level = intel_backlight_level_to_pwm(connector, level);
--
2.34.1
