[ALSA] hda-intel - Fix HDA buffer alignment

From the HDA spec it appears that the buffers written to the BDL and
sent to a codec must be 128 byte aligned (section 4.5.1).  The alignment
was not happening especially when playing 6 channels.  This patch set
the alignment of buffers and periods to 128 bytes.

Signed-off-by: Joachim Deguara <joachim.deguara@amd.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index 13e4837b5ae6e521ce923a00f707bb4ec7c6bc1c..1672cace1ae7d55592a1088a97511efe9761d4c0 100644 (file)
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -1087,6 +1087,10 @@ static int azx_pcm_open(struct snd_pcm_substream *substream)
        runtime->hw.rates = hinfo->rates;
        snd_pcm_limit_hw_rates(runtime);
        snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
+       snd_pcm_hw_constraint_step(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
+                                  128);
+       snd_pcm_hw_constraint_step(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
+                                  128);
        if ((err = hinfo->ops.open(hinfo, apcm->codec, substream)) < 0) {
                azx_release_device(azx_dev);
                mutex_unlock(&chip->open_mutex);