>-----Original Message-----
>From: Sharma, Shashank
>Sent: Wednesday, November 28, 2018 9:41 PM
>To: Shankar, Uma <uma.shankar@xxxxxxxxx>; intel-gfx@xxxxxxxxxxxxxxxxxxxxx;
>dri-devel@xxxxxxxxxxxxxxxxxxxxx
>Cc: Lankhorst, Maarten <maarten.lankhorst@xxxxxxxxx>; Syrjala, Ville
><ville.syrjala@xxxxxxxxx>; jonas@xxxxxxxxx; hansverk@xxxxxxxxx;
>Brian.Starkey@xxxxxxx
>Subject: Re: [v4 1/3] drm: Add HDMI colorspace property
>
>Regards
>
>Shashank
>
>
>On 11/27/2018 10:10 PM, Uma Shankar wrote:
>> This patch adds a HDMI colorspace property, enabling userspace to
>> switch to various supported colorspaces.
>> This will help enable BT2020 along with other colorspaces.
>>
>> v2: Addressed Maarten and Ville's review comments. Enhanced the
>> colorspace enum to incorporate both HDMI and DP supported colorspaces.
>> Also, added a default option for colorspace.
>>
>> v3: Removed Adobe references from enum definitions as per Ville, Hans
>> Verkuil and Jonas Karlman suggestions. Changed Default to an unset
>> state where driver will assign the colorspace is not chosen by user,
>> suggested by Ville and Maarten. Addressed other misc review comments
>> from Maarten. Split the changes to have separate colorspace property
>> for DP and HDMI.
>>
>> v4: Addressed Chris and Ville's review comments, and created a common
>> colorspace property for DP and HDMI, filtered the list based on the
>> colorspaces supported by the respective protocol standard.
>>
>> Signed-off-by: Uma Shankar <uma.shankar@xxxxxxxxx>
>> ---
>> drivers/gpu/drm/drm_atomic_uapi.c | 4 +++
>> drivers/gpu/drm/drm_connector.c | 61
>+++++++++++++++++++++++++++++++++++++++
>> include/drm/drm_connector.h | 14 +++++++++
>> include/uapi/drm/drm_mode.h | 33 +++++++++++++++++++++
>> 4 files changed, 112 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/drm_atomic_uapi.c
>> b/drivers/gpu/drm/drm_atomic_uapi.c
>> index 86ac339..9df7520 100644
>> --- a/drivers/gpu/drm/drm_atomic_uapi.c
>> +++ b/drivers/gpu/drm/drm_atomic_uapi.c
>> @@ -729,6 +729,8 @@ static int drm_atomic_connector_set_property(struct
>drm_connector *connector,
>> return -EINVAL;
>> }
>> state->content_protection = val;
>> + } else if (property == connector->colorspace_property) {
>> + state->colorspace = val;
>> } else if (property == config->writeback_fb_id_property) {
>> struct drm_framebuffer *fb = drm_framebuffer_lookup(dev,
>NULL, val);
>> int ret = drm_atomic_set_writeback_fb_for_connector(state,
>fb); @@
>> -797,6 +799,8 @@ static int drm_atomic_connector_set_property(struct
>drm_connector *connector,
>> *val = state->picture_aspect_ratio;
>> } else if (property == config->content_type_property) {
>> *val = state->content_type;
>> + } else if (property == connector->colorspace_property) {
>> + *val = state->colorspace;
>> } else if (property == connector->scaling_mode_property) {
>> *val = state->scaling_mode;
>> } else if (property == connector->content_protection_property) {
>> diff --git a/drivers/gpu/drm/drm_connector.c
>> b/drivers/gpu/drm/drm_connector.c index fa9baac..57d36e4 100644
>> --- a/drivers/gpu/drm/drm_connector.c
>> +++ b/drivers/gpu/drm/drm_connector.c
>> @@ -826,6 +826,30 @@ int drm_display_info_set_bus_formats(struct
>drm_display_info *info,
>> };
>> DRM_ENUM_NAME_FN(drm_get_content_protection_name,
>drm_cp_enum_list)
>>
>> +static const struct drm_prop_enum_list hdmi_colorspace[] = {
>> + /* For Default case, driver will set the colorspace */
>> + { COLORIMETRY_DEFAULT, "Default" },
>> + /* Standard Definition Colorimetry based on CEA 861 */
>> + { COLORIMETRY_ITU_601, "ITU_601" },
>> + { COLORIMETRY_ITU_709, "ITU_709" },
>> + /* Standard Definition Colorimetry based on IEC 61966-2-4 */
>> + { COLORIMETRY_XV_YCC_601, "XV_YCC_601" },
>> + /* High Definition Colorimetry based on IEC 61966-2-4 */
>> + { COLORIMETRY_XV_YCC_709, "XV_YCC_709" },
>> + /* Colorimetry based on IEC 61966-2-1/Amendment 1 */
>> + { COLORIMETRY_S_YCC_601, "S_YCC_601" },
>> + /* Colorimetry based on IEC 61966-2-5 [33] */
>> + { COLORIMETRY_OPYCC_601, "opYCC_601" },
>> + /* Colorimetry based on IEC 61966-2-5 */
>> + { COLORIMETRY_OPRGB, "opRGB" },
>> + /* Colorimetry based on ITU-R BT.2020 */
>> + { COLORIMETRY_BT2020_RGB, "BT2020_RGB" },
>> + /* Colorimetry based on ITU-R BT.2020 */
>> + { COLORIMETRY_BT2020_YCC, "BT2020_YCC" },
>> + /* Colorimetry based on ITU-R BT.2020 */
>> + { COLORIMETRY_BT2020_CYCC, "BT2020_CYCC" },
>This still doesn't help us with the platform specific colorspace support, like:
>Even for HDMI, Until GEN10, we don't want to add BT2020 colorspace enum
>values for Intel driver, which would be difficult to know for a user.
>
>How about we modify the design a drm helper bit like this:
>1. Keep the absolute_colorimetry_list as the full range of colorimetry enum
>values supported by DRM for HDMI display 2. Make the DRM helper accept a
>series/subset of these enum values, which will be passed from the core driver
>(like I915), and the DRM functions creates property with these passed values.
>3. Call the DRM helper function from functions core driver function (like
>intel_ddi_init()) from where we already know:
> - Which display to select enum values from (HDMI/DP)
> - Which enum values to pick based on current platform (Like if GEN < GEN9,
>add dont add REC_2020 etc)
This sounds good, thanks Shashank. I can develop along these lines. The sink capability will still be on
userspace, but atleast the platform capabilities can be taken care inside driver itself.
I hope this approach is ok with community ?
Regards,
Uma Shankar
>- Shashank
>> +};
>> +
>> /**
>> * DOC: standard connector properties
>> *
>> @@ -1402,6 +1426,43 @@ int drm_mode_create_aspect_ratio_property(struct
>drm_device *dev)
>> EXPORT_SYMBOL(drm_mode_create_aspect_ratio_property);
>>
>> /**
>> + * drm_mode_create_colorspace_property - create colorspace property
>> + * Colorspace:
>> + * This property helps select a suitable colorspace based on the sink
>> + * capability. Modern sink devices support wider gamut like BT2020.
>> + * This helps switch to BT2020 mode if the BT2020 encoded video stream
>> + * is being played by the user, same for any other colorspace.
>> + * @connector: connector to set property on.
>> + *
>> + * Called by a driver the first time it's needed, must be attached to
>> +desired
>> + * connectors.
>> + *
>> + * Returns:
>> + * Zero on success, negative errno on failure.
>> + */
>> +int drm_mode_create_colorspace_property(struct drm_connector
>> +*connector) {
>> + struct drm_device *dev = connector->dev;
>> + struct drm_property *prop;
>> +
>> + if (connector->connector_type == DRM_MODE_CONNECTOR_HDMIA ||
>> + connector->connector_type ==
>DRM_MODE_CONNECTOR_HDMIB) {
>> +
>> + prop = drm_property_create_enum(dev,
>DRM_MODE_PROP_ENUM,
>> + "Colorspace",
>> + hdmi_colorspace,
>> + ARRAY_SIZE(hdmi_colorspace));
>> + if (!prop)
>> + return -ENOMEM;
>> + }
>> +
>> + connector->colorspace_property = prop;
>> +
>> + return 0;
>> +}
>> +EXPORT_SYMBOL(drm_mode_create_colorspace_property);
>> +
>> +/**
>> * drm_mode_create_content_type_property - create content type property
>> * @dev: DRM device
>> *
>> diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
>> index 665b9ca..e98efb1 100644
>> --- a/include/drm/drm_connector.h
>> +++ b/include/drm/drm_connector.h
>> @@ -497,6 +497,13 @@ struct drm_connector_state {
>> unsigned int content_protection;
>>
>> /**
>> + * @colorspace: Connector property to request colorspace
>> + * change on Sink. This is most commonly used to switch to
>> + * wider color gamuts like BT2020.
>> + */
>> + enum absolute_colorimetry_list colorspace;
>> +
>> + /**
>> * @writeback_job: Writeback job for writeback connectors
>> *
>> * Holds the framebuffer and out-fence for a writeback connector.
>> As @@ -978,6 +985,12 @@ struct drm_connector {
>> struct drm_property *content_protection_property;
>>
>> /**
>> + * @colorspace_property: Connector property to set the suitable
>> + * colorspace supported by the sink.
>> + */
>> + struct drm_property *colorspace_property;
>> +
>> + /**
>> * @path_blob_ptr:
>> *
>> * DRM blob property data for the DP MST path property. This should
>> only @@ -1248,6 +1261,7 @@ int
>drm_connector_attach_scaling_mode_property(struct drm_connector
>*connector,
>> int drm_connector_attach_content_protection_property(
>> struct drm_connector *connector);
>> int drm_mode_create_aspect_ratio_property(struct drm_device *dev);
>> +int drm_mode_create_colorspace_property(struct drm_connector
>> +*connector);
>> int drm_mode_create_content_type_property(struct drm_device *dev);
>> void drm_hdmi_avi_infoframe_content_type(struct hdmi_avi_infoframe
>*frame,
>> const struct drm_connector_state
>*conn_state); diff --git
>> a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h index
>> d3e0fe3..42efab8 100644
>> --- a/include/uapi/drm/drm_mode.h
>> +++ b/include/uapi/drm/drm_mode.h
>> @@ -210,6 +210,39 @@
>> #define DRM_MODE_CONTENT_PROTECTION_DESIRED 1
>> #define DRM_MODE_CONTENT_PROTECTION_ENABLED 2
>>
>> +/*
>> + * This is a consolidated colorimetry list supported by HDMI and
>> + * DP protocol standard. The respective connectors will register
>> + * a property with the subset of this list (supported by that
>> + * respective protocol). Userspace will set the colorspace through
>> + * a colorspace property which will be created and exposed to
>> + * userspace.
>> + */
>> +enum absolute_colorimetry_list {
>> + /* For Default case, driver will set the colorspace */
>> + COLORIMETRY_DEFAULT = 0,
>> + /* CEA 861 Normal Colorimetry options */
>> + COLORIMETRY_ITU_601,
>> + COLORIMETRY_ITU_709,
>> + /* CEA 861 Extended Colorimetry Options */
>> + COLORIMETRY_XV_YCC_601,
>> + COLORIMETRY_XV_YCC_709,
>> + COLORIMETRY_S_YCC_601,
>> + COLORIMETRY_OPYCC_601,
>> + COLORIMETRY_OPRGB,
>> + COLORIMETRY_BT2020_RGB,
>> + COLORIMETRY_BT2020_YCC,
>> + COLORIMETRY_BT2020_CYCC,
>> + /* DP MSA Colorimetry Options */
>> + DP_COLORIMETRY_Y_CBCR_ITU_601,
>> + DP_COLORIMETRY_Y_CBCR_ITU_709,
>> + DP_COLORIMETRY_SRGB,
>> + DP_COLORIMETRY_RGB_WIDE_GAMUT,
>> + DP_COLORIMETRY_SCRGB,
>> + DP_COLORIMETRY_DCI_P3,
>> + DP_COLORIMETRY_CUSTOM_COLOR_PROFILE,
>> +};
>> +
>> struct drm_mode_modeinfo {
>> __u32 clock;
>> __u16 hdisplay;
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