ALSA: hda: Drop the BATCH workaround for AMD controllers

BugLink: https://bugs.launchpad.net/bugs/1919492
commit 28e96c1693ec1cdc963807611f8b5ad400431e82 upstream.

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>
Link: https://lore.kernel.org/r/20210308160726.22930-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>

diff --git a/sound/pci/hda/hda_controller.c b/sound/pci/hda/hda_controller.c
index 80016b7b6849e987c9de3f53152fa809d64d3c09..b972d59eb1ec23a9eab333c07fa5d868294d1bd3 100644 (file)
--- 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