Hi all, This is a follow up to the 2 patches to add support for ANX7688 sent here: https://patchwork.kernel.org/patch/9187809/, thanks Archit and Philipp for the comments. I also added 2 patches to add support for a simple display MUX, as I'm facing similar issues while trying to implement it, i.e. the current DRM core does not seem to support this kind of simple pass-thru bridge very well: it is not very clear where connectors should be defined and attached. In this case, not defining any connectors in the 2 bridges (and reusing the connector in MTK HDMI driver) seem to work best, but makes little logical sense as the physical connectors are actually attached to the bridges. In any case, the board has the following layout: - MT8173 HDMI bridge - HDMI mux with 2 ports 1. ANX7688 for HDMI->DP over USB-C conversion 2. Native HDMI The mux is controlled by hardware, looking at the HPD signals from both ANX7688 and native HDMI, with a priority on the native HDMI output. The whole setup works fairly well without any Linux kernel drivers, except the 2 following cases: 1. When ANX7688 is active, DP bandwidth may be limited, so we need to filter resolutions that would exceed the available bandwidth. 2. When both outputs HPD signals are active, the kernel does not receive an HPD pulse when the HDMI input is unplugged. ANX7688 driver fixes issue 1. The mux driver fixes 2 by forcing the kernel to re-read the EDID on mux output change, and also issue 1 by filtering only when ANX7688 is active. I understand this patch series might not be acceptable as-is, but I hope this sort of setup can be taken into account when better support for connector drivers is introduced. Thanks! Best, Nicolas Nicolas Boichat (4): drm: bridge: anx7688: Add anx7688 bridge driver support. devicetree: Add ANX7688 transmitter binding drm: bridge: Generic GPIO mux driver devicetree: Add GPIO display mux binding .../devicetree/bindings/drm/bridge/anx7688.txt | 32 ++ .../devicetree/bindings/drm/bridge/gpio-mux.txt | 59 ++++ drivers/gpu/drm/bridge/Kconfig | 20 ++ drivers/gpu/drm/bridge/Makefile | 2 + drivers/gpu/drm/bridge/analogix-anx7688.c | 233 ++++++++++++++ drivers/gpu/drm/bridge/generic-gpio-mux.c | 347 +++++++++++++++++++++ 6 files changed, 693 insertions(+) create mode 100644 Documentation/devicetree/bindings/drm/bridge/anx7688.txt create mode 100644 Documentation/devicetree/bindings/drm/bridge/gpio-mux.txt create mode 100644 drivers/gpu/drm/bridge/analogix-anx7688.c create mode 100644 drivers/gpu/drm/bridge/generic-gpio-mux.c -- 2.8.0.rc3.226.g39d4020 _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
