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ALSA: hda: Modify stream stripe mask only when needed

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commit e38e486d66e2a3b902768fd71c32dbf10f77e1cb upstream.

The recent commit in HD-audio stream management for changing the
stripe control seems causing a regression on some platforms.  The
stripe control is currently used only by HDMI codec, and applying the
stripe mask unconditionally may lead to scratchy and static noises as
seen on some MacBooks.

For addressing the regression, this patch changes the stream
management code to apply the stripe mask conditionally only when the
codec driver requested.

Fixes: 9b6f7e7a296e ("ALSA: hda: program stripe bits for controller")
BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=204477
Tested-by: Michael Pobega <mpobega@neverware.com>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20191202074947.1617-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Takashi Iwai 2019-12-02 08:49:47 +01:00 committed by Greg Kroah-Hartman
parent feebcef2fd
commit d050d28073
3 changed files with 18 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/sound/hdaudio.h
View File

@ -493,6 +493,7 @@ struct hdac_stream {
bool prepared:1;
bool no_period_wakeup:1;
bool locked:1;
bool stripe:1; /* apply stripe control */
/* timestamp */
unsigned long start_wallclk; /* start + minimum wallclk */

19
sound/hda/hdac_stream.c
View File

@ -96,12 +96,14 @@ void snd_hdac_stream_start(struct hdac_stream *azx_dev, bool fresh_start)
1 << azx_dev->index,
1 << azx_dev->index);
/* set stripe control */
if (azx_dev->substream)
stripe_ctl = snd_hdac_get_stream_stripe_ctl(bus, azx_dev->substream);
else
stripe_ctl = 0;
snd_hdac_stream_updateb(azx_dev, SD_CTL_3B, SD_CTL_STRIPE_MASK,
stripe_ctl);
if (azx_dev->stripe) {
if (azx_dev->substream)
stripe_ctl = snd_hdac_get_stream_stripe_ctl(bus, azx_dev->substream);
else
stripe_ctl = 0;
snd_hdac_stream_updateb(azx_dev, SD_CTL_3B, SD_CTL_STRIPE_MASK,
stripe_ctl);
}
/* set DMA start and interrupt mask */
snd_hdac_stream_updateb(azx_dev, SD_CTL,
0, SD_CTL_DMA_START | SD_INT_MASK);
@ -118,7 +120,10 @@ void snd_hdac_stream_clear(struct hdac_stream *azx_dev)
snd_hdac_stream_updateb(azx_dev, SD_CTL,
SD_CTL_DMA_START | SD_INT_MASK, 0);
snd_hdac_stream_writeb(azx_dev, SD_STS, SD_INT_MASK); /* to be sure */
snd_hdac_stream_updateb(azx_dev, SD_CTL_3B, SD_CTL_STRIPE_MASK, 0);
if (azx_dev->stripe) {
snd_hdac_stream_updateb(azx_dev, SD_CTL_3B, SD_CTL_STRIPE_MASK, 0);
azx_dev->stripe = 0;
}
azx_dev->running = false;
}
EXPORT_SYMBOL_GPL(snd_hdac_stream_clear);

5
sound/pci/hda/patch_hdmi.c
View File

@ -32,6 +32,7 @@
#include <sound/hda_codec.h>
#include "hda_local.h"
#include "hda_jack.h"
#include "hda_controller.h"
static bool static_hdmi_pcm;
module_param(static_hdmi_pcm, bool, 0644);
@ -1240,6 +1241,10 @@ static int hdmi_pcm_open(struct hda_pcm_stream *hinfo,
per_pin->cvt_nid = per_cvt->cvt_nid;
hinfo->nid = per_cvt->cvt_nid;
/* flip stripe flag for the assigned stream if supported */
if (get_wcaps(codec, per_cvt->cvt_nid) & AC_WCAP_STRIPE)
azx_stream(get_azx_dev(substream))->stripe = 1;
snd_hda_set_dev_select(codec, per_pin->pin_nid, per_pin->dev_id);
snd_hda_codec_write_cache(codec, per_pin->pin_nid, 0,
AC_VERB_SET_CONNECT_SEL,