[Bug 74861] [hsw] Fast audio playback on Intel Haswell HDMI due to runtime pm

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=74861

--- Comment #29 from Takashi Iwai <tiwai at suse.de> ---
Thanks.  In Daniel's case, again, the ELD transfer failed between video and
audio.  Doing grep ELD for non-working log,

[    2.382852] [drm:haswell_write_eld] ELD on pipe B
[    2.382857] [drm:haswell_write_eld] ELD size 9
[    3.509002] [drm:drm_edid_to_eld] ELD: no CEA Extension found
[    3.563563] [drm:drm_edid_to_eld] ELD monitor Panasonic-TV
[    3.563566] [drm:drm_edid_to_eld] ELD size 9, SAD count 1
[   16.820283] HDMI: Unknown ELD version 1
[   16.821756] HDMI: Unknown ELD version 1
...

This implies that the contents of passed ELD to the audio is broken by some
reason.

Since HSW_PWR_WELL_CTL* are identical in both cases, might this be a timing
issue?  What if you put some delay in hsw_set_power_well() in intel_pm.c?

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