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

[Takashi Iwai]

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