[PATCH v15 08/28] drm/display: hdmi-state-helper: Act on color format DRM property
From: Nicolas Frattaroli <nicolas.frattaroli@collabora.com>
Date: 2026-05-22 12:34:27
Also in:
dri-devel, intel-gfx, intel-xe, linux-arm-kernel, linux-doc, lkml
Subsystem:
drm drivers, drm drivers and misc gpu patches, the rest · Maintainers:
David Airlie, Simona Vetter, Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann, Linus Torvalds
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 <redacted> Reviewed-by: Maxime Ripard <mripard@kernel.org> Reviewed-by: Daniel Stone <redacted> Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@collabora.com> --- drivers/gpu/drm/display/drm_hdmi_state_helper.c | 31 +++++++++++++++++++++++++ 1 file changed, 31 insertions(+)
diff --git a/drivers/gpu/drm/display/drm_hdmi_state_helper.c b/drivers/gpu/drm/display/drm_hdmi_state_helper.c
index 3ba47564caad..1c54e6feac61 100644
--- a/drivers/gpu/drm/display/drm_hdmi_state_helper.c
+++ b/drivers/gpu/drm/display/drm_hdmi_state_helper.c@@ -670,8 +670,39 @@ 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) {
--
2.54.0
_______________________________________________
Linux-rockchip mailing list
Linux-rockchip@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-rockchip