Hi, On Fri, Dec 15, 2017 at 06:06:32PM +0100, Daniel Vetter wrote: > On Fri, Dec 15, 2017 at 05:46:19PM +0100, Hans Verkuil wrote: > > When I connected my cubieboard running 4.15-rc1 to my 4k display I got no picture. Some > > digging found that there is no check against the upper pixelclock limit of the HDMI > > output, so X selects a 4kp60 format at 594 MHz, which obviously won't work. > > > > The patch below adds a check for the upper bound of what this hardware can do, and > > it checks if the requested tmds clock can be obtained. > > > > It also allows for the ± 0.5% pixel clock variation that the HDMI spec permits. > > > > That code is based on commit 22d0be2a557e53a22feb484e8fce255fe09e6ad5 from > > Jose Abreu for drm/arc. > > > > Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx> > > --- > > Changes since v3: > > - Move the mode_valid callback to struct drm_encoder_helper_funcs. > > I'm assuming this is the correct struct, since this check is specific to the > > hdmi encoder. > > Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx> > > I think sun4i is in drm-misc, so feel free to push. I already pushed the v3. Hans, can you provide an additional patch? on top of your v3? Thanks! Maxime -- Maxime Ripard, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com
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