[alsa-devel] [PATCH v2] ALSA: hda - program ICT bits to support HBR audio

[Subhransu S. Prusty]

On Wed, Sep 20, 2017 at 08:12:36AM -0500, Pierre-Louis Bossart wrote:
> On 9/20/17 5:00 AM, Takashi Iwai wrote:
> >On Wed, 20 Sep 2017 00:25:05 +0200,
> >Pierre-Louis Bossart wrote:
> >>
> >>From: Sriram Periyasamy <sriramx.periyasamy at intel.com>
> >>
> >>On recent Intel platforms (Haswell, Broadwell, Skylake, ApolloLake,
> >>KabyLake, ...), the IEC Coding Type (ICT) bitfield in the Digital
> >>Converter Control #3 needs to be set explicitly for HDMI/DisplayPort
> >>High Bit Rate (HBR) audio playback to work. This was not required in
> >>earlier platforms when HBR was first introduced. The ICT bits are
> >>defined in Section 7.3.3.9 of the HDaudio 1.0a specification.
> >>
> >>Since the ICT bitfield was not specified for HDAudio 1.0 devices
> >>(before 2009), we only program it on machines more recent than
> >>Haswell.
> >>
> >>We tested that this fix is not needed on Baytrail-I (MinnowBoard
> >>Turbot) and believe by extension it also does not apply to Braswell.
> >>
> >>Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=98797
> >>
> >>Signed-off-by: Sriram Periyasamy <sriramx.periyasamy at intel.com>
> >>Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
> >>Signed-off-by: Subhransu S. Prusty <subhransu.s.prusty at intel.com>
> >>---
> >>v2: move digi3 verb in Set section, only set ICT for haswell and newer
> >
> >Applied now with a slight fix (moving *_SET_* definition to the right
> >place).
> 
> Thanks Takashi. Not sure what happened since I have a clear memory
> of doing that change and making a note of it...

Hi Takashi,

I think this patch should have also gone to stable. We didn't cc. Please
suggest whether we should submit it separately for stable.

Regards,
Subhransu

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