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| author | Hans Verkuil <hverkuil@xs4all.nl> | 2017-12-15 16:21:50 +0100 |
|---|---|---|
| committer | Maxime Ripard <maxime.ripard@free-electrons.com> | 2017-12-15 22:24:03 +0100 |
| commit | caea4f384858ee7861367920df36995e7acfe160 (patch) | |
| tree | 65b7874cc1664af83df979e728ea7658dc9c8812 /drivers/net/xen-netback/interface.c | |
| parent | bd36d3bab2e3d08f80766c86487090dbceed4651 (diff) | |
drm/sun4i: validate modes for HDMI
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 22d0be2a557e ("drm: arcpgu: Allow some clock
deviation in crtc->mode_valid() callback") from Jose Abreu for drm/arc.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Thanks-to: Jose Abreu <Jose.Abreu@synopsys.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Link: https://patchwork.freedesktop.org/patch/msgid/162854cb-c7bd-d9ce-9fa0-9a6cd89c621b@xs4all.nl
Diffstat (limited to 'drivers/net/xen-netback/interface.c')
0 files changed, 0 insertions, 0 deletions