This is a note to let you know that I've just added the patch titled
ALSA: hda - Add workaround for CMI8888 snoop behavior
to the 3.17-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
alsa-hda-add-workaround-for-cmi8888-snoop-behavior.patch
and it can be found in the queue-3.17 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 3b70bdba2fcb374a2235a56ab73334348d819579 Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai@xxxxxxx>
Date: Wed, 29 Oct 2014 16:13:05 +0100
Subject: ALSA: hda - Add workaround for CMI8888 snoop behavior
From: Takashi Iwai <tiwai@xxxxxxx>
commit 3b70bdba2fcb374a2235a56ab73334348d819579 upstream.
CMI8888 shows the stuttering playback when the snooping is disabled
on the audio buffer. Meanwhile, we've got reports that CORB/RIRB
doesn't work in the snooped mode. So, as a compromise, disable the
snoop only for CORB/RIRB and enable the snoop for the stream buffers.
The resultant patch became a bit ugly, unfortunately, but we still can
live with it.
Reported-and-tested-by: Geoffrey McRae <geoff@xxxxxxxxxxx>
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
sound/pci/hda/hda_intel.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -373,6 +373,8 @@ static void __mark_pages_wc(struct azx *
#ifdef CONFIG_SND_DMA_SGBUF
if (dmab->dev.type == SNDRV_DMA_TYPE_DEV_SG) {
struct snd_sg_buf *sgbuf = dmab->private_data;
+ if (chip->driver_type == AZX_DRIVER_CMEDIA)
+ return; /* deal with only CORB/RIRB buffers */
if (on)
set_pages_array_wc(sgbuf->page_table, sgbuf->pages);
else
@@ -1768,7 +1770,7 @@ static void pcm_mmap_prepare(struct snd_
#ifdef CONFIG_X86
struct azx_pcm *apcm = snd_pcm_substream_chip(substream);
struct azx *chip = apcm->chip;
- if (!azx_snoop(chip))
+ if (!azx_snoop(chip) && chip->driver_type != AZX_DRIVER_CMEDIA)
area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
#endif
}
Patches currently in stable-queue which might be from tiwai@xxxxxxx are
queue-3.17/alsa-pcm-zero-clear-reserved-fields-of-pcm-status-ioctl-in-compat-mode.patch
queue-3.17/alsa-hda-add-workaround-for-cmi8888-snoop-behavior.patch
queue-3.17/alsa-bebob-uninitialized-id-returned-by-saffirepro_both_clk_src_get.patch
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