NAK: [SRU][B/OEM-B/C/D/E][PATCH 0/1] Audio doesn't work after s3 or s4 on cnl and glk machines

[Hui Wang]

Please ignore this patch, I found after applying this patch, It fixed 
the audio issue, but it introduced a "screen flickering issue" on the 
glk machines. So only backporting this patch is not enough, we need to 
backport more patches from v5.2-rc1 since v5.2-rc1 works perfectly.

I will send more patches in the V2 to address both audio issue and the 
screen flickering issue.

On 2019/6/3 下午2:07, Hui Wang wrote:
> BugLink: https://bugs.launchpad.net/bugs/1826868
>
> The patch is already in the v5.2-rc1, so don't send the patch
> to unstable.
>
> [Impact]
> After s3 or s4, the hdmi audio driver will re-probe the hw, if the hdmi
> monitor is not plugged before s3 or s4, the re-probe will fail on cnl
> and glk machines.
>
> [Fix]
> Keep the cdclk alive when re-probing
>
> [Test Case]
> do s3 and s4 without hdmi monitor plugged, after s3 or s4, plug the hdmi
> monitor, to check if the hdmi audio works well, it works well indeed.
>
> [Regression Risk]
> Low. the 1st patch is specific to cnl and glk machines, and without this patch,
> the cdclk is 0, after applying this patch, if hdmi audio want to probe hw, the
> patch just set the a non-zero freq on cdclk.
>
>
> Ville Syrjälä (1):
>    drm/i915: Force 2*96 MHz cdclk on glk/cnl when audio power is enabled
>
>   drivers/gpu/drm/i915/i915_drv.h      |  3 ++
>   drivers/gpu/drm/i915/intel_audio.c   | 59 ++++++++++++++++++++++++++++
>   drivers/gpu/drm/i915/intel_cdclk.c   | 30 +++++---------
>   drivers/gpu/drm/i915/intel_display.c |  9 ++++-
>   drivers/gpu/drm/i915/intel_drv.h     |  3 ++
>   5 files changed, 83 insertions(+), 21 deletions(-)
>