Write panel override luminance values which helps the TCON decide
if tone mapping needs to be enabled or not.
Signed-off-by: Suraj Kandpal <suraj.kandpal@xxxxxxxxx>
---
.../drm/i915/display/intel_dp_aux_backlight.c | 25 +++++++++++++++++++
1 file changed, 25 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 b13eee250dc4..cb6f01daae42 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
@@ -381,6 +381,29 @@ static const char *dpcd_vs_pwm_str(bool aux)
return aux ? "DPCD" : "PWM";
}
+static void
+intel_dp_aux_write_panel_luminance_override(struct intel_connector *connector)
+{
+ struct drm_i915_private *i915 = to_i915(connector->base.dev);
+ struct intel_panel *panel = &connector->panel;
+ struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);
+ int ret;
+ u8 buf[4] = {};
+
+ buf[0] = panel->backlight.min & 0xFF;
+ buf[1] = (panel->backlight.min & 0xFF00) >> 8;
+ buf[2] = panel->backlight.max & 0xFF;
+ buf[3] = (panel->backlight.max & 0xFF00) >> 8;
+
+ ret = drm_dp_dpcd_write(&intel_dp->aux,
+ INTEL_EDP_HDR_PANEL_LUMINANCE_OVERRIDE,
+ buf, sizeof(buf));
+ if (ret < 0)
+ drm_dbg_kms(&i915->drm,
+ "Panel Luminance DPCD reg write failed, err:-%d\n",
+ ret);
+}
+
static int
intel_dp_aux_hdr_setup_backlight(struct intel_connector *connector, enum pipe pipe)
{
@@ -412,6 +435,8 @@ intel_dp_aux_hdr_setup_backlight(struct intel_connector *connector, enum pipe pi
panel->backlight.min = 0;
}
+ intel_dp_aux_write_panel_luminance_override(connector);
+
drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] Using AUX HDR interface for backlight control (range %d..%d)\n",
connector->base.base.id, connector->base.name,
panel->backlight.min, panel->backlight.max);
--
2.43.2
