Resend with correct addresses for Eugeni and Chris... On Mon, Dec 16, 2013 at 3:47 PM, Daniel Drake <drake@xxxxxxxxxxxx> wrote: > Hi, > > I'm using exynos_drm on Exynos4412 to output to a Sony HDMI TV. > > When I disconnect and then re-plug the TV, Exynos detects this event > and tries to read the EDID from the DDC over I2C. > > The DDC does not provide an ACK at this point, so the i2c-s3c2410 > driver reports ENXIO, which seems to agree with the documentation: > > ENXIO > Returned by I2C adapters to indicate that the address phase > of a transfer didn't get an ACK. While it might just mean > an I2C device was temporarily not responding, usually it > means there's nothing listening at that address. > > As of commit 9292f37e1f5c79400254dca46f83313488093825, DRM treats > ENXIO as "no device, bail": > > Author: Eugeni Dodonov <eugeni.dodonov@xxxxxxxxx> > Date: Thu Jan 5 09:34:28 2012 -0200 > > drm: give up on edid retries when i2c bus is not responding > > But in the case of my Sony TV it seems that we hit the "temporarily > not responding" case, because if I insert a delay, the message gets > acked and the EDID gets read successfully. Similarly, if I revert the > patch so that we attempt the query a few times times, it succeeds on > second retry. > > Any suggested solutions to this issue? > > Thanks, > Daniel _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
