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drm/i915/dp: Write panel override luminance values

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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@intel.com>
Reviewed-by: Sebastian Wick <sebastian.wick@redhat.com>
Signed-off-by: Uma Shankar <uma.shankar@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240507040407.1056061-8-suraj.kandpal@intel.com
This commit is contained in:
Suraj Kandpal
2024-05-07 09:34:07 +05:30
committed by Uma Shankar
parent b0944c983d
commit 84ceb14076
1 changed files with 25 additions and 0 deletions
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25
drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
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@@ -374,6 +374,29 @@ 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)
{
@@ -405,6 +428,8 @@ 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);