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drm/display: hdmi-state-helper: Act on color format DRM property

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With the introduction of the "color format" DRM property, which allows
userspace to request a specific color format, the HDMI state helper
should implement this.

Implement it by translating the requested drm_connector_color_format to
a drm_output_color_format enum value as per the logic HDMI should use
for this: Auto is translated to RGB, and a fallback to YUV420 is only
performed if the original color format was auto.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Reviewed-by: Maxime Ripard <mripard@kernel.org>
Reviewed-by: Daniel Stone <daniel@fooishbar.org>
Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@collabora.com>
Link: https://patch.msgid.link/20260609-color-format-v17-8-35739b5782cc@collabora.com
Signed-off-by: Daniel Stone <daniels@collabora.com>
This commit is contained in:
Nicolas Frattaroli 2026-06-09 14:43:55 +02:00 committed by Daniel Stone
parent 3f0f770ccc
commit cb5c6b7e7b
1 changed files with 31 additions and 0 deletions
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31
drivers/gpu/drm/display/drm_hdmi_state_helper.c
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@ -671,8 +671,39 @@ hdmi_compute_config(const struct drm_connector *connector,
unsigned int max_bpc = clamp_t(unsigned int,
conn_state->max_bpc,
8, connector->max_bpc);
enum drm_output_color_format fmt;
int ret;
if (conn_state->color_format != DRM_CONNECTOR_COLOR_FORMAT_AUTO) {
switch (conn_state->color_format) {
case DRM_CONNECTOR_COLOR_FORMAT_AUTO:
drm_warn(connector->dev, "AUTO format in non-AUTO path.\n");
fallthrough;
case DRM_CONNECTOR_COLOR_FORMAT_RGB444:
fmt = DRM_OUTPUT_COLOR_FORMAT_RGB444;
break;
case DRM_CONNECTOR_COLOR_FORMAT_YCBCR444:
fmt = DRM_OUTPUT_COLOR_FORMAT_YCBCR444;
break;
case DRM_CONNECTOR_COLOR_FORMAT_YCBCR422:
fmt = DRM_OUTPUT_COLOR_FORMAT_YCBCR422;
break;
case DRM_CONNECTOR_COLOR_FORMAT_YCBCR420:
fmt = DRM_OUTPUT_COLOR_FORMAT_YCBCR420;
break;
default:
drm_dbg_kms(connector->dev, "HDMI does not support color format '%d'.\n",
conn_state->color_format);
return -EINVAL;
}
return hdmi_compute_format_bpc(connector, conn_state, mode, max_bpc, fmt);
}
/*
* For %DRM_CONNECTOR_COLOR_FORMAT_AUTO, try RGB first, and fall back
* to the less bandwidth-intensive YCBCR420 if RGB fails.
*/
ret = hdmi_compute_format_bpc(connector, conn_state, mode, max_bpc,
DRM_OUTPUT_COLOR_FORMAT_RGB444);
if (ret) {