On Thu, Nov 15, 2018 at 05:32:48PM +0100, Paul Kocialkowski wrote: > Writeback connectors do not produce any on-screen output and require > special care for use. Such connectors are hidden from enumeration in > DRM resources by default, but they are still picked-up by fbdev. > This makes rather little sense since fbdev is not really adapted for > dealing with writeback. > > Moreover, this is also a source of issues when userspace disables the > CRTC (and associated plane) without detaching the CRTC from the > connector (which is hidden by default). In this case, the connector is > still using the CRTC, leading to am "enabled/connectors mismatch" and > eventually the failure of the associated atomic commit. This situation > happens with VC4 testing under IGT GPU Tools. > > Filter out writeback connectors in the fbdev helper to solve this. > > Signed-off-by: Paul Kocialkowski <paul.kocialkowski@xxxxxxxxxxx> Reviewed-by: Maxime Ripard <maxime.ripard@xxxxxxxxxxx> Tested-by: Maxime Ripard <maxime.ripard@xxxxxxxxxxx> Thanks! Maxime -- Maxime Ripard, Bootlin Embedded Linux and Kernel engineering https://bootlin.com
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