Hi Dmitry, On 12/10/24 3:12 AM, Dmitry Baryshkov wrote: > On Fri, Dec 06, 2024 at 10:00:46PM +0200, Cristian Ciocaltea wrote: >> Bridges having the DRM_BRIDGE_OP_HDMI flag set in drm_bridge->ops are >> supposed to rely on drm_bridge->supported_formats bitmask to advertise >> the supported colorspaces, including HDMI_COLORSPACE_YUV420. Therefore, >> the newly introduced drm_bridge->ycbcr_420_allowed flag becomes >> redundant in this particular context. >> >> Moreover, when drm_bridge_connector gets initialised, only >> drm_bridge->ycbcr_420_allowed is considered in the process of adjusting >> the equivalent property of the base drm_connector, which effectively >> discards the formats advertised by the HDMI bridge. > > I think this should be handled in a different way: during HDMI connector > init verify that HDMI_COLORSPACE_YUV420 matches the > drm_connector->ycbcr_420_allowed value and rejects incompatible > connectors. I added a 2nd patch in v3 [1] to perform this verification on HDMI connector init, but I think we still need a proper handling of the inconsistency at bridge[-connector] level. I simplified a bit the initial approach, hopefully that would bring us closer to an acceptable solution. Thanks, Cristian [1] https://lore.kernel.org/lkml/20241217-bridge-conn-fmt-prio-v3-0-3ecb3c8fc06f@xxxxxxxxxxxxx/
