I tested the patch from Ville Syrjälä's email and it works fine on top of 4.14 for me.
Thanks, Neil On Thu, Nov 9, 2017 at 1:16 PM, Eric Anholt <e...@anholt.net> wrote: > Daniel Vetter <dan...@ffwll.ch> writes: > > > On Wed, Nov 08, 2017 at 02:21:08PM -0800, Eric Anholt wrote: > >> Ville Syrjälä <ville.syrj...@linux.intel.com> writes: > >> > >> > On Wed, Nov 08, 2017 at 12:17:28PM -0800, Eric Anholt wrote: > >> >> Ville Syrjala <ville.syrj...@linux.intel.com> writes: > >> >> > >> >> > From: Ville Syrjälä <ville.syrj...@linux.intel.com> > >> >> > > >> >> > Apparently some sinks look at the YQ bits even when receiving RGB, > >> >> > and they get somehow confused when they see a non-zero YQ value. > >> >> > So we can't just blindly follow CEA-861-F and set YQ to match the > >> >> > RGB range. > >> >> > > >> >> > Unfortunately there is no good way to tell whether the sink > >> >> > designer claims to have read CEA-861-F. The CEA extension block > >> >> > revision number has generally been stuck at 3 since forever, > >> >> > and even a very recently manufactured sink might be based on > >> >> > an old design so the manufacturing date doesn't seem like > >> >> > something we can use. In lieu of better information let's > >> >> > follow CEA-861-F only for HDMI 2.0 sinks, since HDMI 2.0 is > >> >> > based on CEA-861-F. For HDMI 1.x sinks we'll always set YQ=0. > >> >> > > >> >> > The alternative would of course be to always set YQ=0. And if > >> >> > we ever encounter a HDMI 2.0+ sink with this bug that's what > >> >> > we'll probably have to do. > >> >> > >> >> Should vc4 be doing anything special for HDMI2 sinks, if it's an > HDMI1.4 > >> >> source? > >> > > >> > As long as you stick to < 340 MHz modes you shouldn't have to do > >> > anything. For >=340 MHz you'd need to use some new HDMI 2.0 features. > >> > > >> > Looks like vc4 crtc .mode_valid() doesn't do much. I presume it's up > >> > to bridges/encoders to filter out most things that aren't supported? > >> > >> I had a patch for that at > >> https://patchwork.freedesktop.org/series/30680/ -- fedora folks had run > >> into trouble with 4k monitors. > > > > Ack on the clock limiting patch, silly that it's stuck. No idea about > CEC, > > better for Hans/Boris I guess. > > Thanks! >
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