drm: arcpgu: Allow some clock deviation in crtc->mode_valid() callback

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Currently we expect that clock driver produces the exact same value
as we are requiring. There can, and will, be some deviation
however so we need to take that into account instead of just
rejecting the mode.

According to the HDMI spec we have a max of +-0.5% for the pixel clock
frequency deviation. Lets take that into an advantage and use it to
calculate how much deviation we can support.

Signed-off-by: Jose Abreu <joabreu@synopsys.com>
Acked-by: Alexey Brodkin <abrodkin@synopsys.com>
Cc: Carlos Palminha <palminha@synopsys.com>
Cc: Alexey Brodkin <abrodkin@synopsys.com>
Cc: Daniel Vetter <daniel.vetter@intel.com>
Cc: Dave Airlie <airlied@gmail.com>
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>

...

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Jose Abreu 2017-07-17 13:08:27 +01:00 • committed by Alexey Brodkin

parent 0c43ff59e7

commit 22d0be2a55

1 changed files with 4 additions and 3 deletions

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drivers/gpu/drm/arc/arcpgu_crtc.c

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