On Mon, 21 Sep 2020 11:42:00 +0200, Pawel Harlozinski wrote:

Fix setting SDnFMT based on High Definition Audio Specification Rev. 1.0a page 48.

Bits per Sample (BITS): 000 = 8 bits. The data will be packed in memory in 8-bit containers on 16-bit boundaries. 001 = 16 bits. The data will be packed in memory in 16-bit containers on 16-bit boundaries. 010 = 20 bits. The data will be packed in memory in 32-bit containers on 32-bit boundaries. 011 = 24 bits. The data will be packed in memory in 32-bit containers on 32-bit boundaries. 100 = 32 bits. The data will be packed in memory in 32-bit containers on 32-bit boundaries. 101-111 = Reserved

Set SDnFMT depending on which format was given. Henceforth split cases for formats 20, 24, 32 bits, but leave constraints to maxbps.

As mentioned in the previous thread, practically seen, case 20 and 24 are never met, since HD-audio doesn't accept the SNDRV_PCM_FORMAT_20* or _24* due to the 32bit container. So this change is superfluous.

I can take the change, but it has to be clarified that it won't affect the behavior on the real hardware but pure theoretical.

Change-Id: I97771b16da14e85b7f35372f5dfc87bb13bb5ce0

Please drop change-id. It's not useful for others.

thanks,

Takashi

Signed-off-by: Pawel Harlozinski pawel.harlozinski@linux.intel.com

sound/hda/hdac_device.c | 7 +++++++ 1 file changed, 7 insertions(+)

diff --git a/sound/hda/hdac_device.c b/sound/hda/hdac_device.c index 3e9e9ac804f6..ccc47a10ba63 100644 --- a/sound/hda/hdac_device.c +++ b/sound/hda/hdac_device.c @@ -764,7 +764,14 @@ unsigned int snd_hdac_calc_stream_format(unsigned int rate, val |= AC_FMT_BITS_16; break; case 20:

• val |= AC_FMT_BITS_20;
  

• break;
  

  case 24:

• if (maxbps >= 24)
  

• 	val |= AC_FMT_BITS_24;
  

• else
  

• 	val |= AC_FMT_BITS_20;
  

• break;
  

  case 32: if (maxbps >= 32 || format == SNDRV_PCM_FORMAT_FLOAT_LE) val |= AC_FMT_BITS_32;

-- 2.17.1