HDMI displays can support various output types, based on
the color space and subsampling type. The possible
outputs from a HDMI 2.0 monitor could be:
- RGB
- YCBCR 444
- YCBCR 422
- YCBCR 420
This patch adds a drm property "hdmi_output_format", using which,
a user can specify its preference, for the HDMI output type. The
output type enums are similar to the mentioned outputs above. To
handle various subsampling of YCBCR output types, this property
allows two special cases:
- DRM_HDMI_OUTPUT_YCBCR_HQ
This indicates preferred output should be YCBCR output, with highest
subsampling rate by the source/sink, which can be typically:
- ycbcr444
- ycbcr422
- ycbcr420
- DRM_HDMI_OUTPUT_YCBCR_LQ
This indicates preferred output should be YCBCR output, with lowest
subsampling rate supported by source/sink, which can be:
- ycbcr420
- ycbcr422
- ycbcr444
Default value of the property is set to 0 = RGB, so no changes if you
dont set the property.
PS: While doing modeset for YCBCR 420 only modes, this property is
ignored, as those timings can be supported only in YCBCR 420
output mode.
V2: Added description for the new variable to address build warning
V3: Rebase
V4: Rebase
V5: Added get_property counterpart to fix IGT BAT failures (BAT/CI)
Danvet:
- Add documentation for the new property
- Create a sub-section for HDMI properties, and add documentation for
few more HDMI propeties. Added documentation for:
- Broadcast RGB
- aspect ratio
Cc: Ville Syrjala <ville.syrjala@xxxxxxxxxxxxxxx>
Cc: Jose Abreu <joabreu@xxxxxxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxxx>
Signed-off-by: Shashank Sharma <shashank.sharma@xxxxxxxxx>
---
Documentation/gpu/drm-kms.rst | 12 +++++++
drivers/gpu/drm/drm_atomic.c | 4 +++
drivers/gpu/drm/drm_atomic_helper.c | 4 +++
drivers/gpu/drm/drm_connector.c | 69 ++++++++++++++++++++++++++++++++++++-
drivers/gpu/drm/drm_crtc_internal.h | 1 +
drivers/gpu/drm/drm_mode_config.c | 4 +++
drivers/gpu/drm/i915/intel_modes.c | 13 +++++++
include/drm/drm_connector.h | 18 ++++++++++
include/drm/drm_mode_config.h | 5 +++
9 files changed, 129 insertions(+), 1 deletion(-)
diff --git a/Documentation/gpu/drm-kms.rst b/Documentation/gpu/drm-kms.rst
index 3072841..dcdd6ff 100644
--- a/Documentation/gpu/drm-kms.rst
+++ b/Documentation/gpu/drm-kms.rst
@@ -508,6 +508,18 @@ Standard Connector Properties
.. kernel-doc:: drivers/gpu/drm/drm_connector.c
:doc: standard connector properties
+Standard HDMI Properties
+-----------------------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_connector.c
+ :doc: hdmi_output_format
+
+.. kernel-doc:: drivers/gpu/drm/drm_connector.c
+ :doc: aspect ratio property
+
+.. kernel-doc:: drivers/gpu/drm/i915/intel_modes.c
+ :doc: Broadcast RGB property
+
Plane Composition Properties
----------------------------
diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index 09ca662..adcb89d 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -1192,6 +1192,8 @@ int drm_atomic_connector_set_property(struct drm_connector *connector,
state->picture_aspect_ratio = val;
} else if (property == connector->scaling_mode_property) {
state->scaling_mode = val;
+ } else if (property == config->hdmi_output_property) {
+ state->hdmi_output = val;
} else if (connector->funcs->atomic_set_property) {
return connector->funcs->atomic_set_property(connector,
state, property, val);
@@ -1272,6 +1274,8 @@ drm_atomic_connector_get_property(struct drm_connector *connector,
*val = state->picture_aspect_ratio;
} else if (property == connector->scaling_mode_property) {
*val = state->scaling_mode;
+ } else if (property == config->hdmi_output_property) {
+ *val = state->hdmi_output;
} else if (connector->funcs->atomic_get_property) {
return connector->funcs->atomic_get_property(connector,
state, property, val);
diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 23e4661..2e7459f 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -637,6 +637,10 @@ drm_atomic_helper_check_modeset(struct drm_device *dev,
if (old_connector_state->link_status !=
new_connector_state->link_status)
new_crtc_state->connectors_changed = true;
+
+ if (old_connector_state->hdmi_output !=
+ new_connector_state->hdmi_output)
+ new_crtc_state->connectors_changed = true;
}
if (funcs->atomic_check)
diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index 8072e6e..8357918 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -227,6 +227,11 @@ int drm_connector_init(struct drm_device *dev,
config->edid_property,
0);
+ if (connector_type != DRM_MODE_CONNECTOR_VIRTUAL)
+ drm_object_attach_property(&connector->base,
+ config->hdmi_output_property,
+ 0);
+
drm_object_attach_property(&connector->base,
config->dpms_property, 0);
@@ -617,6 +622,26 @@ static const struct drm_prop_enum_list drm_link_status_enum_list[] = {
};
DRM_ENUM_NAME_FN(drm_get_link_status_name, drm_link_status_enum_list)
+static const struct drm_prop_enum_list drm_hdmi_output_enum_list[] = {
+ { DRM_HDMI_OUTPUT_DEFAULT_RGB, "output_rgb" },
+ { DRM_HDMI_OUTPUT_YCBCR444, "output_ycbcr444" },
+ { DRM_HDMI_OUTPUT_YCBCR422, "output_ycbcr422" },
+ { DRM_HDMI_OUTPUT_YCBCR420, "output_ycbcr420" },
+ { DRM_HDMI_OUTPUT_YCBCR_HQ, "output_ycbcr_high_subsampling" },
+ { DRM_HDMI_OUTPUT_YCBCR_LQ, "output_ycbcr_low_subsampling" },
+ { DRM_HDMI_OUTPUT_INVALID, "invalid_output" },
+};
+
+/**
+ * drm_get_hdmi_output_name - return a string for a given hdmi output enum
+ * @type: enum of output type
+ */
+const char *drm_get_hdmi_output_name(enum drm_hdmi_output_type type)
+{
+ return drm_hdmi_output_enum_list[type].name;
+}
+EXPORT_SYMBOL(drm_get_hdmi_output_name);
+
/**
* drm_display_info_set_bus_formats - set the supported bus formats
* @info: display info to store bus formats in
@@ -697,7 +722,36 @@ static const struct drm_prop_enum_list drm_tv_subconnector_enum_list[] = {
{ DRM_MODE_SUBCONNECTOR_SCART, "SCART" }, /* TV-out */
};
DRM_ENUM_NAME_FN(drm_get_tv_subconnector_name,
- drm_tv_subconnector_enum_list)
+ drm_tv_subconnector_enum_list);
+
+/**
+ * DOC: hdmi_output_format
+ *
+ * hdmi_output_format:
+ * Enum property which allows a userspace to provide its preference for a
+ * HDMI output format. Standard HDMI 1.4b outputs can support RGB/YCBCR444
+ * YCBCR422 output formats, whereas HDMI 2.0 outputs can additionally
+ * support YCBCR420 output. Default value of the property is HDMI output
+ * RGB.
+ *
+ * A driver can attach to this property, and then handle the HDMI output
+ * based on its capabilities and sink support. There are few helper
+ * functions available in drm_modes.c which can help in finding the best
+ * suitable output considering a sink/source/mode combination. Refer to
+ * drm_modes.c:drm_display_info_hdmi_output_type()
+ */
+int drm_connector_create_hdmi_properties(struct drm_device *dev)
+{
+ struct drm_property *prop;
+
+ prop = drm_property_create_enum(dev, 0, "hdmi_output_format",
+ drm_hdmi_output_enum_list,
+ ARRAY_SIZE(drm_hdmi_output_enum_list));
+ if (!prop)
+ return -ENOMEM;
+ dev->mode_config.hdmi_output_property = prop;
+ return 0;
+}
/**
* DOC: standard connector properties
@@ -1024,6 +1078,19 @@ int drm_connector_attach_scaling_mode_property(struct drm_connector *connector,
}
EXPORT_SYMBOL(drm_connector_attach_scaling_mode_property);
+
+/**
+ * DOC: aspect ratio property
+ *
+ * aspect ratio:
+ * Enum property to override the HDMI output's aspect ratio.
+ * When this property is set, the aspect ratio of the frame in
+ * AVI infoframes is set as per the property value. For example
+ * if userspace sets the property value to DRM_MODE_PICTURE_ASPECT_4_3
+ * the output aspect ratio is set to 4:3 (regardless of the PAR of mode)
+ *
+ */
+
/**
* drm_mode_create_aspect_ratio_property - create aspect ratio property
* @dev: DRM device
diff --git a/drivers/gpu/drm/drm_crtc_internal.h b/drivers/gpu/drm/drm_crtc_internal.h
index d077c54..e6c4adc 100644
--- a/drivers/gpu/drm/drm_crtc_internal.h
+++ b/drivers/gpu/drm/drm_crtc_internal.h
@@ -140,6 +140,7 @@ int drm_mode_connector_set_obj_prop(struct drm_mode_object *obj,
struct drm_property *property,
uint64_t value);
int drm_connector_create_standard_properties(struct drm_device *dev);
+int drm_connector_create_hdmi_properties(struct drm_device *dev);
const char *drm_get_connector_force_name(enum drm_connector_force force);
/* IOCTL */
diff --git a/drivers/gpu/drm/drm_mode_config.c b/drivers/gpu/drm/drm_mode_config.c
index d986225..3ba9262 100644
--- a/drivers/gpu/drm/drm_mode_config.c
+++ b/drivers/gpu/drm/drm_mode_config.c
@@ -210,6 +210,10 @@ static int drm_mode_create_standard_properties(struct drm_device *dev)
if (ret)
return ret;
+ ret = drm_connector_create_hdmi_properties(dev);
+ if (ret)
+ return ret;
+
prop = drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE,
"type", drm_plane_type_enum_list,
ARRAY_SIZE(drm_plane_type_enum_list));
diff --git a/drivers/gpu/drm/i915/intel_modes.c b/drivers/gpu/drm/i915/intel_modes.c
index 951e834..d07de45 100644
--- a/drivers/gpu/drm/i915/intel_modes.c
+++ b/drivers/gpu/drm/i915/intel_modes.c
@@ -104,6 +104,19 @@ static const struct drm_prop_enum_list broadcast_rgb_names[] = {
{ INTEL_BROADCAST_RGB_LIMITED, "Limited 16:235" },
};
+/**
+ * DOC: Broadcast RGB property
+ *
+ * Broadcast RGB:
+ * Enum property to indicate RGB color range of a HDMI output.
+ * For limited range RGB outputs, a remapping of pixel values from 0-255
+ * should be remaped to a range of 16-235. When this property is set to
+ * Limited 16:235 and CTM is set, the hardware will be programmed with the
+ * result of the multiplication of CTM by the limited range matrix, to
+ * ensure the pixels normaly in the range 0..1.0 are remapped to the range
+ * 16/255..235/255.
+ *
+ */
void
intel_attach_broadcast_rgb_property(struct drm_connector *connector)
{
diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index 4bc0882..3773600 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -319,6 +319,17 @@ struct drm_tv_connector_state {
unsigned int hue;
};
+/* HDMI output pixel format */
+enum drm_hdmi_output_type {
+ DRM_HDMI_OUTPUT_DEFAULT_RGB, /* default RGB */
+ DRM_HDMI_OUTPUT_YCBCR444, /* YCBCR 444 */
+ DRM_HDMI_OUTPUT_YCBCR422, /* YCBCR 422 */
+ DRM_HDMI_OUTPUT_YCBCR420, /* YCBCR 420 */
+ DRM_HDMI_OUTPUT_YCBCR_HQ, /* Highest subsampled YUV */
+ DRM_HDMI_OUTPUT_YCBCR_LQ, /* Lowest subsampled YUV */
+ DRM_HDMI_OUTPUT_INVALID, /* Guess what ? */
+};
+
/**
* struct drm_connector_state - mutable connector state
* @connector: backpointer to the connector
@@ -363,6 +374,12 @@ struct drm_connector_state {
* upscaling, mostly used for built-in panels.
*/
unsigned int scaling_mode;
+
+ /**
+ * @hdmi_output: Connector property to control the
+ * HDMI output mode (RGB/YCBCR444/422/420).
+ */
+ enum drm_hdmi_output_type hdmi_output;
};
/**
@@ -991,6 +1008,7 @@ static inline void drm_connector_unreference(struct drm_connector *connector)
const char *drm_get_connector_status_name(enum drm_connector_status status);
const char *drm_get_subpixel_order_name(enum subpixel_order order);
+const char *drm_get_hdmi_output_name(enum drm_hdmi_output_type type);
const char *drm_get_dpms_name(int val);
const char *drm_get_dvi_i_subconnector_name(int val);
const char *drm_get_dvi_i_select_name(int val);
diff --git a/include/drm/drm_mode_config.h b/include/drm/drm_mode_config.h
index 4298171..1887261 100644
--- a/include/drm/drm_mode_config.h
+++ b/include/drm/drm_mode_config.h
@@ -740,6 +740,11 @@ struct drm_mode_config {
* the position of the output on the host's screen.
*/
struct drm_property *suggested_y_property;
+ /**
+ * @hdmi_output_property: output pixel format from HDMI display
+ * Default is set for RGB
+ */
+ struct drm_property *hdmi_output_property;
/* dumb ioctl parameters */
uint32_t preferred_depth, prefer_shadow;
--
2.7.4
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