[PATCH] ALSA: hda: Drop the BATCH workaround for AMD controllers

[Takashi Iwai <tiwai@suse.de>]

The commit c02f77d32d2c ("ALSA: hda - Workaround for crackled sound on
AMD controller (1022:1457)") introduced a few workarounds for the
recent AMD HD-audio controller, and one of them is the forced BATCH
PCM mode so that PulseAudio avoids the timer-based scheduling.  This
was thought to cover for some badly working applications, but this
actually worsens for more others.  In total, this wasn't a good idea
to enforce it.

This is a partial revert of the commit above for dropping the PCM
BATCH enforcement part to recover from the regression again.

Fixes: c02f77d32d2c ("ALSA: hda - Workaround for crackled sound on AMD controller (1022:1457)")
BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=195303
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 sound/pci/hda/hda_controller.c | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/sound/pci/hda/hda_controller.c b/sound/pci/hda/hda_controller.c
index 9087981cd1f7..ca2f2ecd1488 100644
--- a/sound/pci/hda/hda_controller.c
+++ b/sound/pci/hda/hda_controller.c
@@ -609,13 +609,6 @@ static int azx_pcm_open(struct snd_pcm_substream *substream)
 				     20,
 				     178000000);
 
-	/* by some reason, the playback stream stalls on PulseAudio with
-	 * tsched=1 when a capture stream triggers.  Until we figure out the
-	 * real cause, disable tsched mode by telling the PCM info flag.
-	 */
-	if (chip->driver_caps & AZX_DCAPS_AMD_WORKAROUND)
-		runtime->hw.info |= SNDRV_PCM_INFO_BATCH;
-
 	if (chip->align_buffer_size)
 		/* constrain buffer sizes to be multiple of 128
 		   bytes. This is more efficient in terms of memory
-- 
2.26.2