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authorMengdong Lin <mengdong.lin@intel.com>2014-05-13 16:57:08 +0800
committerTakashi Iwai <tiwai@suse.de>2014-05-13 12:11:58 +0200
commit7189eb9b8f7962474956196c301676470542f253 (patch)
tree0fc40bb01dd753d2e4fb5014582276dd3e34250b /sound
parentec5fe98886b686f065ef29d8dee1b3ca66f5fd48 (diff)
downloadlinux-7189eb9b8f7962474956196c301676470542f253.tar.bz2
ALSA: hda - mask buggy stream DMA0 for Broadwell display controller
Broadwell display controller has 3 stream DMA engines. DMA0 cannot update DMA postion buffer properly while DMA1 and DMA2 can work well. So this patch masks the buggy DMA0 by keeping it as opened. This is a tentative workaround, so keep the change small as Takashi suggested. Signed-off-by: Mengdong Lin <mengdong.lin@intel.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound')
-rw-r--r--sound/pci/hda/hda_intel.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index b540ad71eb0d..2c54629d62d1 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -1367,6 +1367,12 @@ static int azx_first_init(struct azx *chip)
/* initialize streams */
azx_init_stream(chip);
+ /* workaround for Broadwell HDMI: the first stream is broken,
+ * so mask it by keeping it as if opened
+ */
+ if (pci->vendor == 0x8086 && pci->device == 0x160c)
+ chip->azx_dev[0].opened = 1;
+
/* initialize chip */
azx_init_pci(chip);
azx_init_chip(chip, (probe_only[dev] & 2) == 0);