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@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@intel.com Signed-off-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com Signed-off-by: Subhransu S. Prusty subhransu.s.prusty@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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