[PATCH v3 1/1] ALSA: hda: Refactor calculating SDnFMT according to specification

[Pawel Harlozinski]

Fix setting SDnFMT based on :wq
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.

Signed-off-by: Pawel Harlozinski <pawel.harlozinski at linux.intel.com>

---

 v3: drop gerrit Change-Id
 v2: leave constraints to maxbps
 
 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