On 12/13/22 05:34, Pekka Paalanen wrote:
> Sorry, hand slipped on keyboard and sent out a draft of this email too
> early.
>
>
> On Mon, 12 Dec 2022 13:21:27 -0500
> Harry Wentland <harry.wentl...@amd.com> wrote:
>
>> Drivers might not support all colorspaces defined in
>> dp_colorspaces and hdmi_colorspaces. This results in
>> undefined behavior when userspace is setting an
>> unsupported colorspace.
>>
>> Allow drivers to pass the list of supported colorspaces
>> when creating the colorspace property.
>
> Hi Harry,
>
> what is there for drivers to support? Isn't this just infoframe data
> that shall be sent down to the sink as-is with no other effect?
> The kerneldoc for "Colorspace" says it has no other effect.
>
> Is the driver confusing colorimetry with color-representation (the
> RGB-YCbCr conversion)? Or is this property defining both?
>
> I feel that the documentation of "Colorspace" KMS connector property
> needs clarification, and a list of potentially available values with
> explanations, more than just a reference to CTA-861-H which it does not
> even do yet.
>
> Perhaps a table, where for each enum drm_colorspace entry has a row
> explaining the expectations of the sink:
> - primaries and white point
> - transfer characteristic
> - YCbCr-RGB or similar conversion to/from some RGB
>
> Each cell can be a reference to a spec like BT.709 or BT.601 (525 line).
>
> I think this belongs in the kernel doc more than in color-and-hdr.
>
> CTA-861-H does not give all the information but refers to things like
> xvYCC601 which you then need to figure out from Wikipedia or whatever
> which is annoying and raises questions about its correctness. Would be
> better if someone who actually has access to the authoritative specs
> would review the table.
>
Agreed. This was based on previous work for Colorspace support on a
drm_connector
and I already went deeper than I hope I had to go, but it looks I didn't go far
enough. :)
Documenting this should also address your comments on Patch 14.
Harry
>
> Thanks,
> pq
>
>
>> Signed-off-by: Harry Wentland <harry.wentl...@amd.com>
>> Cc: Pekka Paalanen <ppaala...@gmail.com>
>> Cc: Sebastian Wick <sebastian.w...@redhat.com>
>> Cc: vitaly.pros...@amd.com
>> Cc: Uma Shankar <uma.shan...@intel.com>
>> Cc: Ville Syrjälä <ville.syrj...@linux.intel.com>
>> Cc: Joshua Ashton <jos...@froggi.es>
>> Cc: dri-devel@lists.freedesktop.org
>> Cc: amd-...@lists.freedesktop.org
>> ---
>> drivers/gpu/drm/drm_connector.c | 140 +++++++++---------
>> .../gpu/drm/i915/display/intel_connector.c | 4 +-
>> drivers/gpu/drm/vc4/vc4_hdmi.c | 2 +-
>> include/drm/drm_connector.h | 8 +-
>> 4 files changed, 83 insertions(+), 71 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/drm_connector.c
>> b/drivers/gpu/drm/drm_connector.c
>> index ddba0b9fcc17..0df5db3e4fec 100644
>> --- a/drivers/gpu/drm/drm_connector.c
>> +++ b/drivers/gpu/drm/drm_connector.c
>> @@ -1012,64 +1012,57 @@ static const struct drm_prop_enum_list
>> drm_dp_subconnector_enum_list[] = {
>> DRM_ENUM_NAME_FN(drm_get_dp_subconnector_name,
>> drm_dp_subconnector_enum_list)
>>
>> -static const struct drm_prop_enum_list hdmi_colorspaces[] = {
>> - /* For Default case, driver will set the colorspace */
>> - { DRM_MODE_COLORIMETRY_DEFAULT, "Default" },
>> - /* Standard Definition Colorimetry based on CEA 861 */
>> - { DRM_MODE_COLORIMETRY_SMPTE_170M_YCC, "SMPTE_170M_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 IEC 61966-2-5 */
>> - { DRM_MODE_COLORIMETRY_OPRGB, "opRGB" },
>> - /* 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_RGB, "BT2020_RGB" },
>> - /* Colorimetry based on ITU-R BT.2020 */
>> - { DRM_MODE_COLORIMETRY_BT2020_YCC, "BT2020_YCC" },
>> - /* Added as part of Additional Colorimetry Extension in 861.G */
>> - { DRM_MODE_COLORIMETRY_DCI_P3_RGB_D65, "DCI-P3_RGB_D65" },
>> - { DRM_MODE_COLORIMETRY_DCI_P3_RGB_THEATER, "DCI-P3_RGB_Theater" },
>> +static const char * const colorspace_names[] = {
>> + [DRM_MODE_COLORIMETRY_DEFAULT] = "Default",
>> + [DRM_MODE_COLORIMETRY_SMPTE_170M_YCC] = "SMPTE_170M_YCC",
>> + [DRM_MODE_COLORIMETRY_BT709_YCC] = "BT709_YCC",
>> + [DRM_MODE_COLORIMETRY_XVYCC_601] = "XVYCC_601",
>> + [DRM_MODE_COLORIMETRY_XVYCC_709] = "XVYCC_709",
>> + [DRM_MODE_COLORIMETRY_SYCC_601] = "SYCC_601",
>> + [DRM_MODE_COLORIMETRY_OPYCC_601] = "opYCC_601",
>> + [DRM_MODE_COLORIMETRY_OPRGB] = "opRGB",
>> + [DRM_MODE_COLORIMETRY_BT2020_CYCC] = "BT2020_CYCC",
>> + [DRM_MODE_COLORIMETRY_BT2020_RGB] = "BT2020_RGB",
>> + [DRM_MODE_COLORIMETRY_BT2020_YCC] = "BT2020_YCC",
>> + [DRM_MODE_COLORIMETRY_DCI_P3_RGB_D65] = "P3_RGB_D65",
>> + [DRM_MODE_COLORIMETRY_DCI_P3_RGB_THEATER] = "P3_RGB_Theater",
>> + [DRM_MODE_COLORIMETRY_RGB_WIDE_FIXED] = "RGB_WIDE_FIXED",
>> + [DRM_MODE_COLORIMETRY_RGB_WIDE_FLOAT] = "RGB_WIDE_FLOAT",
>> + [DRM_MODE_COLORIMETRY_BT601_YCC] = "BT601_YCC",
>> };
>>
>> +static const u32 hdmi_colorspaces =
>> + BIT(DRM_MODE_COLORIMETRY_SMPTE_170M_YCC) |
>> + BIT(DRM_MODE_COLORIMETRY_BT709_YCC) |
>> + BIT(DRM_MODE_COLORIMETRY_XVYCC_601) |
>> + BIT(DRM_MODE_COLORIMETRY_XVYCC_709) |
>> + BIT(DRM_MODE_COLORIMETRY_SYCC_601) |
>> + BIT(DRM_MODE_COLORIMETRY_OPYCC_601) |
>> + BIT(DRM_MODE_COLORIMETRY_OPRGB) |
>> + BIT(DRM_MODE_COLORIMETRY_BT2020_CYCC) |
>> + BIT(DRM_MODE_COLORIMETRY_BT2020_RGB) |
>> + BIT(DRM_MODE_COLORIMETRY_BT2020_YCC) |
>> + BIT(DRM_MODE_COLORIMETRY_DCI_P3_RGB_D65) |
>> + BIT(DRM_MODE_COLORIMETRY_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" },
>> - { DRM_MODE_COLORIMETRY_RGB_WIDE_FIXED, "RGB_Wide_Gamut_Fixed_Point" },
>> - /* Colorimetry based on scRGB (IEC 61966-2-2) */
>> - { DRM_MODE_COLORIMETRY_RGB_WIDE_FLOAT, "RGB_Wide_Gamut_Floating_Point"
>> },
>> - /* Colorimetry based on IEC 61966-2-5 */
>> - { DRM_MODE_COLORIMETRY_OPRGB, "opRGB" },
>> - /* Colorimetry based on SMPTE RP 431-2 */
>> - { DRM_MODE_COLORIMETRY_DCI_P3_RGB_D65, "DCI-P3_RGB_D65" },
>> - /* 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" },
>> -};
>> +static const u32 dp_colorspaces =
>> + BIT(DRM_MODE_COLORIMETRY_RGB_WIDE_FIXED) |
>> + BIT(DRM_MODE_COLORIMETRY_RGB_WIDE_FLOAT) |
>> + BIT(DRM_MODE_COLORIMETRY_OPRGB) |
>> + BIT(DRM_MODE_COLORIMETRY_DCI_P3_RGB_D65) |
>> + BIT(DRM_MODE_COLORIMETRY_BT2020_RGB) |
>> + BIT(DRM_MODE_COLORIMETRY_BT601_YCC) |
>> + BIT(DRM_MODE_COLORIMETRY_BT709_YCC) |
>> + BIT(DRM_MODE_COLORIMETRY_XVYCC_601) |
>> + BIT(DRM_MODE_COLORIMETRY_XVYCC_709) |
>> + BIT(DRM_MODE_COLORIMETRY_SYCC_601) |
>> + BIT(DRM_MODE_COLORIMETRY_OPYCC_601) |
>> + BIT(DRM_MODE_COLORIMETRY_BT2020_CYCC) |
>> + BIT(DRM_MODE_COLORIMETRY_BT2020_YCC);
>>
>> /**
>> * DOC: standard connector properties
>> @@ -1972,21 +1965,34 @@ EXPORT_SYMBOL(drm_mode_create_aspect_ratio_property);
>> */
>>
>> static int drm_mode_create_colorspace_property(struct drm_connector
>> *connector,
>> - const struct drm_prop_enum_list
>> *colorspaces,
>> - int size)
>> + u32 supported_colorspaces)
>> {
>> struct drm_device *dev = connector->dev;
>> + u32 colorspaces = supported_colorspaces |
>> BIT(DRM_MODE_COLORIMETRY_DEFAULT);
>> + struct drm_prop_enum_list enum_list[DRM_MODE_COLORIMETRY_MAX];
>> + int i, len;
>>
>> if (connector->colorspace_property)
>> return 0;
>>
>> - if (!colorspaces)
>> - return 0;
>> + if (WARN_ON(supported_colorspaces == 0 ||
>> + (supported_colorspaces & -BIT(DRM_MODE_COLORIMETRY_MAX)) !=
>> 0))
>> + return -EINVAL;
>> +
>> + len = 0;
>> + for (i = 0; i < DRM_MODE_COLORIMETRY_MAX; i++) {
>> + if ((colorspaces & BIT(i)) == 0)
>> + continue;
>> +
>> + enum_list[len].type = i;
>> + enum_list[len].name = colorspace_names[i];
>> + len++;
>> + }
>>
>> connector->colorspace_property =
>> drm_property_create_enum(dev, DRM_MODE_PROP_ENUM, "Colorspace",
>> - colorspaces,
>> - size);
>> + enum_list,
>> + len);
>>
>> if (!connector->colorspace_property)
>> return -ENOMEM;
>> @@ -2003,11 +2009,12 @@ static int
>> drm_mode_create_colorspace_property(struct drm_connector *connector,
>> * Returns:
>> * Zero on success, negative errno on failure.
>> */
>> -int drm_mode_create_hdmi_colorspace_property(struct drm_connector
>> *connector)
>> +int drm_mode_create_hdmi_colorspace_property(struct drm_connector
>> *connector,
>> + u32 supported_colorspaces)
>> {
>> - return drm_mode_create_colorspace_property(connector,
>> - hdmi_colorspaces,
>> -
>> ARRAY_SIZE(hdmi_colorspaces));
>> + u32 colorspaces = supported_colorspaces & hdmi_colorspaces;
>> +
>> + return drm_mode_create_colorspace_property(connector, colorspaces);
>> }
>> EXPORT_SYMBOL(drm_mode_create_hdmi_colorspace_property);
>>
>> @@ -2021,11 +2028,12 @@
>> EXPORT_SYMBOL(drm_mode_create_hdmi_colorspace_property);
>> * Returns:
>> * Zero on success, negative errno on failure.
>> */
>> -int drm_mode_create_dp_colorspace_property(struct drm_connector *connector)
>> +int drm_mode_create_dp_colorspace_property(struct drm_connector *connector,
>> + u32 supported_colorspaces)
>> {
>> - return drm_mode_create_colorspace_property(connector,
>> - dp_colorspaces,
>> - ARRAY_SIZE(dp_colorspaces));
>> + u32 colorspaces = supported_colorspaces & dp_colorspaces;
>> +
>> + return drm_mode_create_colorspace_property(connector, colorspaces);
>> }
>> EXPORT_SYMBOL(drm_mode_create_dp_colorspace_property);
>>
>> diff --git a/drivers/gpu/drm/i915/display/intel_connector.c
>> b/drivers/gpu/drm/i915/display/intel_connector.c
>> index 1dcc268927a2..6e7cef58a626 100644
>> --- a/drivers/gpu/drm/i915/display/intel_connector.c
>> +++ b/drivers/gpu/drm/i915/display/intel_connector.c
>> @@ -283,13 +283,13 @@ intel_attach_aspect_ratio_property(struct
>> drm_connector *connector)
>> void
>> intel_attach_hdmi_colorspace_property(struct drm_connector *connector)
>> {
>> - if (!drm_mode_create_hdmi_colorspace_property(connector))
>> + if (!drm_mode_create_hdmi_colorspace_property(connector, 0xffffffff))
>> drm_connector_attach_colorspace_property(connector);
>> }
>>
>> void
>> intel_attach_dp_colorspace_property(struct drm_connector *connector)
>> {
>> - if (!drm_mode_create_dp_colorspace_property(connector))
>> + if (!drm_mode_create_dp_colorspace_property(connector, 0xffffffff))
>> drm_connector_attach_colorspace_property(connector);
>> }
>> diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
>> index 6ab83296b0e4..8d08d6a36f37 100644
>> --- a/drivers/gpu/drm/vc4/vc4_hdmi.c
>> +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
>> @@ -416,7 +416,7 @@ static int vc4_hdmi_connector_init(struct drm_device
>> *dev,
>> if (ret)
>> return ret;
>>
>> - ret = drm_mode_create_hdmi_colorspace_property(connector);
>> + ret = drm_mode_create_hdmi_colorspace_property(connector, 0xffffffff);
>> if (ret)
>> return ret;
>>
>> diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
>> index edef65388c29..5825c6ab969b 100644
>> --- a/include/drm/drm_connector.h
>> +++ b/include/drm/drm_connector.h
>> @@ -30,6 +30,7 @@
>> #include <linux/notifier.h>
>> #include <drm/drm_mode_object.h>
>> #include <drm/drm_util.h>
>> +#include <drm/drm_property.h>
>>
>> #include <uapi/drm/drm_mode.h>
>>
>> @@ -393,6 +394,7 @@ enum drm_colorspace {
>> DRM_MODE_COLORIMETRY_RGB_WIDE_FIXED,
>> DRM_MODE_COLORIMETRY_RGB_WIDE_FLOAT,
>> DRM_MODE_COLORIMETRY_BT601_YCC,
>> + DRM_MODE_COLORIMETRY_MAX
>> };
>>
>> /**
>> @@ -1818,8 +1820,10 @@ int
>> drm_connector_attach_hdr_output_metadata_property(struct drm_connector *conn
>> bool drm_connector_atomic_hdr_metadata_equal(struct drm_connector_state
>> *old_state,
>> struct drm_connector_state
>> *new_state);
>> int drm_mode_create_aspect_ratio_property(struct drm_device *dev);
>> -int drm_mode_create_hdmi_colorspace_property(struct drm_connector
>> *connector);
>> -int drm_mode_create_dp_colorspace_property(struct drm_connector *connector);
>> +int drm_mode_create_hdmi_colorspace_property(struct drm_connector
>> *connector,
>> + u32 supported_colorspaces);
>> +int drm_mode_create_dp_colorspace_property(struct drm_connector *connector,
>> + u32 supported_colorspaces);
>> int drm_mode_create_content_type_property(struct drm_device *dev);
>> int drm_mode_create_suggested_offset_properties(struct drm_device *dev);
>>
>
