drm/i915: Add support for limited color range of broadcast outputs
In order to prevent "crushed blacks" on TVs, the range of the RGB output
may be limited to 16-235. This used to be available through Xorg under
the "Broadcast RGB" option, so reintroduce support for KMS.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=34543
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index c635c9e..f289b86 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -41,6 +41,7 @@
struct intel_encoder base;
u32 sdvox_reg;
int ddc_bus;
+ uint32_t color_range;
bool has_hdmi_sink;
bool has_audio;
int force_audio;
@@ -124,6 +125,7 @@
u32 sdvox;
sdvox = SDVO_ENCODING_HDMI | SDVO_BORDER_ENABLE;
+ sdvox |= intel_hdmi->color_range;
if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
sdvox |= SDVO_VSYNC_ACTIVE_HIGH;
if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
@@ -278,6 +280,7 @@
uint64_t val)
{
struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);
+ struct drm_i915_private *dev_priv = connector->dev->dev_private;
int ret;
ret = drm_connector_property_set_value(connector, property, val);
@@ -305,6 +308,14 @@
goto done;
}
+ if (property == dev_priv->broadcast_rgb_property) {
+ if (val == !!intel_hdmi->color_range)
+ return 0;
+
+ intel_hdmi->color_range = val ? SDVO_COLOR_RANGE_16_235 : 0;
+ goto done;
+ }
+
return -EINVAL;
done:
@@ -363,6 +374,8 @@
intel_hdmi->force_audio_property->values[1] = 1;
drm_connector_attach_property(connector, intel_hdmi->force_audio_property, 0);
}
+
+ intel_attach_broadcast_rgb_property(connector);
}
void intel_hdmi_init(struct drm_device *dev, int sdvox_reg)