[PATCH v4 3/7] drm: Add DisplayPort colorspace property

[Ilia Mirkin]

So how would this work with a DP++ connector? Should it list the HDMI
or DP properties? Or do we need a custom property checker which is
aware of what is currently plugged in to validate the values?

On Tue, Sep 3, 2019 at 5:12 AM Gwan-gyeong Mun
<gwan-gyeong.mun at intel.com> wrote:
>
> In order to use colorspace property to Display Port connectors, it extends
> DRM_MODE_CONNECTOR_DisplayPort connector_type on
> drm_mode_create_colorspace_property function.
>
> v3: Addressed review comments from Ville
>     - Add new colorimetry options for DP 1.4a spec.
>     - Separate set of colorimetry enum values for DP.
> v4: Add additional comments to struct drm_prop_enum_list.
>     Polishing an enum string of struct drm_prop_enum_list
> Signed-off-by: Gwan-gyeong Mun <gwan-gyeong.mun at intel.com>
> Reviewed-by: Uma Shankar <uma.shankar at intel.com>
> ---
>  drivers/gpu/drm/drm_connector.c | 46 +++++++++++++++++++++++++++++++++
>  include/drm/drm_connector.h     |  8 ++++++
>  2 files changed, 54 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
> index 4c766624b20d..5834e6d330a0 100644
> --- a/drivers/gpu/drm/drm_connector.c
> +++ b/drivers/gpu/drm/drm_connector.c
> @@ -882,6 +882,44 @@ static const struct drm_prop_enum_list hdmi_colorspaces[] = {
>         { DRM_MODE_COLORIMETRY_DCI_P3_RGB_THEATER, "DCI-P3_RGB_Theater" },
>  };
>
> +/*
> + * As per DP 1.4a spec, 2.2.5.7.5 VSC SDP Payload for Pixel Encoding/Colorimetry
> + * Format Table 2-120
> + */
> +static const struct drm_prop_enum_list dp_colorspaces[] = {
> +       /* For Default case, driver will set the colorspace */
> +       { DRM_MODE_COLORIMETRY_DEFAULT, "Default" },
> +       /* Colorimetry based on IEC 61966-2-1 */
> +       { DRM_MODE_COLORIMETRY_SRGB, "sRGB" },
> +       { DRM_MODE_COLORIMETRY_WIDE_GAMUT_FIXED_POINT_RGB, "wide_gamut_fixed_point_RGB" },
> +       /* Colorimetry based on IEC 61966-2-2, wide gamut floating point RGB */
> +       { DRM_MODE_COLORIMETRY_SCRGB, "scRGB" },
> +       { DRM_MODE_COLORIMETRY_ADOBE_RGB, "Adobe_RGB" },
> +       /* Colorimetry based on SMPTE RP 431-2 */
> +       { DRM_MODE_COLORIMETRY_DCP_P3_RGB, "DCI-P3_RGB" },
> +       /* Colorimetry based on ITU-R BT.2020 */
> +       { DRM_MODE_COLORIMETRY_BT2020_RGB, "BT2020_RGB" },
> +       { DRM_MODE_COLORIMETRY_BT601_YCC, "BT601_YCC" },
> +       { DRM_MODE_COLORIMETRY_BT709_YCC, "BT709_YCC" },
> +       /* Standard Definition Colorimetry based on IEC 61966-2-4 */
> +       { DRM_MODE_COLORIMETRY_XVYCC_601, "XVYCC_601" },
> +       /* High Definition Colorimetry based on IEC 61966-2-4 */
> +       { DRM_MODE_COLORIMETRY_XVYCC_709, "XVYCC_709" },
> +       /* Colorimetry based on IEC 61966-2-1/Amendment 1 */
> +       { DRM_MODE_COLORIMETRY_SYCC_601, "SYCC_601" },
> +       /* Colorimetry based on IEC 61966-2-5 [33] */
> +       { DRM_MODE_COLORIMETRY_OPYCC_601, "opYCC_601" },
> +       /* Colorimetry based on ITU-R BT.2020 */
> +       { DRM_MODE_COLORIMETRY_BT2020_CYCC, "BT2020_CYCC" },
> +       /* Colorimetry based on ITU-R BT.2020 */
> +       { DRM_MODE_COLORIMETRY_BT2020_YCC, "BT2020_YCC" },
> +       /*
> +        * Colorumetry based on Digital Imaging and Communications in Medicine
> +        * (DICOM) Part 14: Grayscale Standard Display Function
> +        */
> +       { DRM_MODE_COLORIMETRY_DICOM_PART_14_GRAYSCALE, "DICOM_Part_14_Grayscale" },
> +};
> +
>  /**
>   * DOC: standard connector properties
>   *
> @@ -1710,6 +1748,14 @@ int drm_mode_create_colorspace_property(struct drm_connector *connector)
>                                                 ARRAY_SIZE(hdmi_colorspaces));
>                 if (!prop)
>                         return -ENOMEM;
> +       } else if (connector->connector_type == DRM_MODE_CONNECTOR_DisplayPort ||
> +                  connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
> +               prop = drm_property_create_enum(dev, DRM_MODE_PROP_ENUM,
> +                                               "Colorspace",
> +                                               dp_colorspaces,
> +                                               ARRAY_SIZE(dp_colorspaces));
> +               if (!prop)
> +                       return -ENOMEM;
>         } else {
>                 DRM_DEBUG_KMS("Colorspace property not supported\n");
>                 return 0;
> diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
> index 681cb590f952..8848e5d6b0c4 100644
> --- a/include/drm/drm_connector.h
> +++ b/include/drm/drm_connector.h
> @@ -281,6 +281,14 @@ enum drm_panel_orientation {
>  /* Additional Colorimetry extension added as part of CTA 861.G */
>  #define DRM_MODE_COLORIMETRY_DCI_P3_RGB_D65            11
>  #define DRM_MODE_COLORIMETRY_DCI_P3_RGB_THEATER                12
> +/* Additional Colorimetry Options added for DP 1.4a VSC Colorimetry Format */
> +#define DRM_MODE_COLORIMETRY_SRGB                      13
> +#define DRM_MODE_COLORIMETRY_WIDE_GAMUT_FIXED_POINT_RGB        14
> +#define DRM_MODE_COLORIMETRY_SCRGB                     15
> +#define DRM_MODE_COLORIMETRY_ADOBE_RGB                 16
> +#define DRM_MODE_COLORIMETRY_DCP_P3_RGB                        17
> +#define DRM_MODE_COLORIMETRY_BT601_YCC                 18
> +#define DRM_MODE_COLORIMETRY_DICOM_PART_14_GRAYSCALE   19
>
>  /**
>   * enum drm_bus_flags - bus_flags info for &drm_display_info
> --
> 2.23.0
>
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