[Bug 104952] [regression] Loss of i915 (Apollo Lake/Broxton) HDMI audio after display sleep v4.14+

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104952

Imre Deak <imre.deak at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ville.syrjala at linux.intel.c
                   |                            |om

--- Comment #8 from Imre Deak <imre.deak at intel.com> ---
(In reply to Simon Casey from comment #7)
> I'll certainly give those patches a try and report back.
> 
> In the meantime I rebuilt both e8a3a2a3d7f7a1 and 42d9366d41a992 with gcc
> 7.3.0 previously used 6.4.0) and run a few passes of the last test.
> 
> Essentially it seems 42d9366d41a992 is now less prone to show the issue,
> around 1/3 of tries were affected). But also e8a3a2a3d7f7a1 has now
> exhibited it in 3/16 runs.

Ah, ok so 42d9366d41a992 is not the culprit. So maybe no use in trying my debug
patches. Ville in the meantime told me there is a known problem with the codec
probing if the CDCLK rate is too low. So could you instead try if the following
fixes it (on top of 42d9366d41a992 let's say and/or drm-tip):

diff --git a/drivers/gpu/drm/i915/intel_cdclk.c
b/drivers/gpu/drm/i915/intel_cdclk.c
index 1241e5891b29..03ebd6589b07 100644
--- a/drivers/gpu/drm/i915/intel_cdclk.c
+++ b/drivers/gpu/drm/i915/intel_cdclk.c
@@ -1083,10 +1083,8 @@ static int bxt_calc_cdclk(int max_pixclk)
                return 576000;
        else if (max_pixclk > 288000)
                return 384000;
-       else if (max_pixclk > 144000)
-               return 288000;
        else
-               return 144000;
+               return 288000;
 }

 static int glk_calc_cdclk(int max_pixclk)


> I've also rebuilt 4.13.16 with 7.3.0, and it's survived 16 passes without
> issue, not that it necessarily means it's free of the issue or not...

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