Re: [PATCH 16/22] drm/vkms: Introduce config for connector supported colorspace

["José Expósito" <jose.exposito89@gmail.com>]

On Sat, Oct 18, 2025 at 04:01:16AM +0200, Louis Chauvet wrote:
> To emulate some HDR features of displays, it is required to expose some
> properties on HDMI, eDP and DP connectors.
> 
> Signed-off-by: Louis Chauvet <louis.chauvet@bootlin.com>
> ---
>  drivers/gpu/drm/vkms/tests/vkms_config_test.c |  3 +++
>  drivers/gpu/drm/vkms/vkms_config.c            |  1 +
>  drivers/gpu/drm/vkms/vkms_config.h            | 26 ++++++++++++++++++++++++++
>  drivers/gpu/drm/vkms/vkms_connector.c         | 15 +++++++++++++++
>  4 files changed, 45 insertions(+)
> 
> diff --git a/drivers/gpu/drm/vkms/tests/vkms_config_test.c b/drivers/gpu/drm/vkms/tests/vkms_config_test.c
> index 8633210342a4..a89ccd75060d 100644
> --- a/drivers/gpu/drm/vkms/tests/vkms_config_test.c
> +++ b/drivers/gpu/drm/vkms/tests/vkms_config_test.c
> @@ -187,6 +187,9 @@ static void vkms_config_test_default_config(struct kunit *test)
>  	vkms_config_for_each_connector(config, connector_cfg) {
>  		KUNIT_EXPECT_EQ(test, vkms_config_connector_get_type(connector_cfg),
>  				DRM_MODE_CONNECTOR_VIRTUAL);
> +		KUNIT_EXPECT_EQ(test,
> +				vkms_config_connector_get_supported_colorspaces(connector_cfg),
> +				0);
>  	}
>  
>  	KUNIT_EXPECT_TRUE(test, vkms_config_is_valid(config));
> diff --git a/drivers/gpu/drm/vkms/vkms_config.c b/drivers/gpu/drm/vkms/vkms_config.c
> index 20750c9f6d08..56e2082b91c9 100644
> --- a/drivers/gpu/drm/vkms/vkms_config.c
> +++ b/drivers/gpu/drm/vkms/vkms_config.c
> @@ -772,6 +772,7 @@ struct vkms_config_connector *vkms_config_create_connector(struct vkms_config *c
>  	connector_cfg->config = config;
>  	connector_cfg->status = connector_status_connected;
>  	vkms_config_connector_set_type(connector_cfg, DRM_MODE_CONNECTOR_VIRTUAL);
> +	vkms_config_connector_set_supported_colorspaces(connector_cfg, 0);
>  	xa_init_flags(&connector_cfg->possible_encoders, XA_FLAGS_ALLOC);
>  
>  	list_add_tail(&connector_cfg->link, &config->connectors);
> diff --git a/drivers/gpu/drm/vkms/vkms_config.h b/drivers/gpu/drm/vkms/vkms_config.h
> index 36d289a010f6..ec614c2d4a30 100644
> --- a/drivers/gpu/drm/vkms/vkms_config.h
> +++ b/drivers/gpu/drm/vkms/vkms_config.h
> @@ -141,6 +141,7 @@ struct vkms_config_connector {
>  
>  	int type;
>  	enum drm_connector_status status;
> +	u32 supported_colorspaces;

I don't know much about the specifics of colorspaces, so I'd appreciate some
additional feedback in the connector code.

Here we could add some docs and also print the value in vkms_config_show().

>  	struct xarray possible_encoders;
>  
>  	/* Internal usage */
> @@ -239,6 +240,31 @@ struct vkms_config *vkms_config_default_create(bool enable_cursor,
>   */
>  void vkms_config_destroy(struct vkms_config *config);
>  
> +/**
> + * vkms_config_connector_set_supported_colorspaces() - Set the supported colorspaces for a connector
> + * @connector_cfg: Connector configuration to modify
> + * @supported_colorspaces: Bitmask of supported colorspaces (DRM_COLOR_YCBCR_*)
> + */
> +static inline void
> +vkms_config_connector_set_supported_colorspaces(struct vkms_config_connector *connector_cfg,
> +						u32 supported_colorspaces)
> +{
> +	connector_cfg->supported_colorspaces = supported_colorspaces;
> +}
> +
> +/**
> + * vkms_config_connector_get_supported_colorspaces() - Get the supported colorspaces for a connector
> + * @connector_cfg: Connector configuration to query
> + *
> + * Returns:
> + * Bitmask of supported colorspaces (DRM_COLOR_YCBCR_*)
> + */
> +static inline u32
> +vkms_config_connector_get_supported_colorspaces(struct vkms_config_connector *connector_cfg)
> +{
> +	return connector_cfg->supported_colorspaces;
> +}
> +
>  /**
>   * vkms_config_get_device_name() - Return the name of the device
>   * @config: Configuration to get the device name from
> diff --git a/drivers/gpu/drm/vkms/vkms_connector.c b/drivers/gpu/drm/vkms/vkms_connector.c
> index 5a87dc2d4c63..cc59d13c2d22 100644
> --- a/drivers/gpu/drm/vkms/vkms_connector.c
> +++ b/drivers/gpu/drm/vkms/vkms_connector.c
> @@ -84,6 +84,21 @@ struct vkms_connector *vkms_connector_init(struct vkms_device *vkmsdev,
>  	if (ret)
>  		return ERR_PTR(ret);
>  
> +	if (vkms_config_connector_get_supported_colorspaces(connector_cfg)) {
> +		if (connector_cfg->type == DRM_MODE_CONNECTOR_HDMIA) {
> +			drm_mode_create_hdmi_colorspace_property(&connector->base,
> +								 vkms_config_connector_get_supported_colorspaces(connector_cfg));
> +			drm_connector_attach_hdr_output_metadata_property(&connector->base);
> +			drm_connector_attach_colorspace_property(&connector->base);
> +		} else if (connector_cfg->type == DRM_MODE_CONNECTOR_DisplayPort ||
> +			   connector_cfg->type == DRM_MODE_CONNECTOR_eDP) {
> +			drm_mode_create_dp_colorspace_property(&connector->base,
> +							       vkms_config_connector_get_supported_colorspaces(connector_cfg));
> +			drm_connector_attach_hdr_output_metadata_property(&connector->base);
> +			drm_connector_attach_colorspace_property(&connector->base);
> +		}
> +	}
> +
>  	drm_connector_helper_add(&connector->base, &vkms_conn_helper_funcs);
>  
>  	return connector;
> 
> -- 
> 2.51.0
>