[Bug 97442] [HSW HDMI] Audio with 44.1 khz not working when 1920x1080p screen refreshrate > 30hz

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97442

--- Comment #16 from Mark Wilczynski <Mark_Wilczynski at hotmail.com> ---
I figured out why I was seeing video frame skipping when playing 59.940 fps
content using 1920x1080 at 59.940 video mode.

When the pipeline is configured for regular 8-bit output, the refresh rate
measures 59.94005994.  This is virtually perfect for the requested modeline:

 Modeline 0:"" 0 148352 1920 2008 2052 2200 1080 1084 1089 1125 0x0 0x5

When the pipeline is configured for 12=bit output, the refresh rate measures
59.89304812.  This causes a frame to be skipped every 21.2 seconds
(1/(59.94005994-59.89304812)) in order to stay in sync with the expected 59.940
rate.

I measured the actual vsync rate using the GPU counters in the PIPE_FRMCNT and
PIPE_FRMTMSTMP registers.

In Windows 10, the refresh rate is correct at both 8-bit and 12-bit output so
there must be some error in the Linux driver when setting up the pixel clock or
its dividers.

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