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drm/connector: hdmi: Use YUV420 output format as an RGB fallback

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Try to make use of YUV420 when computing the best output format and
RGB cannot be supported for any of the available color depths.

Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
Reviewed-by: Maxime Ripard <mripard@kernel.org>
Link: https://lore.kernel.org/r/20250527-hdmi-conn-yuv-v5-6-74c9c4a8ac0c@collabora.com
Signed-off-by: Maxime Ripard <mripard@kernel.org>
This commit is contained in:
Cristian Ciocaltea
2025-05-27 15:11:14 +03:00
committed by Maxime Ripard
parent 4809299add
commit 04561845fc
1 changed files with 14 additions and 4 deletions
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18
drivers/gpu/drm/display/drm_hdmi_state_helper.c
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@@ -649,12 +649,22 @@ hdmi_compute_config(const struct drm_connector *connector,
8, connector->max_bpc);
int ret;
/*
* TODO: Add support for YCbCr420 output for HDMI 2.0 capable
* devices, for modes that only support YCbCr420.
*/
ret = hdmi_compute_format_bpc(connector, conn_state, mode, max_bpc,
HDMI_COLORSPACE_RGB);
if (ret) {
if (connector->ycbcr_420_allowed) {
ret = hdmi_compute_format_bpc(connector, conn_state,
mode, max_bpc,
HDMI_COLORSPACE_YUV420);
if (ret)
drm_dbg_kms(connector->dev,
"YUV420 output format doesn't work.\n");
} else {
drm_dbg_kms(connector->dev,
"YUV420 output format not allowed for connector.\n");
ret = -EINVAL;
}
}
return ret;
}