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ALSA: hda - mask buggy stream DMA0 for Broadwell display controller

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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>
This commit is contained in:
Mengdong Lin 2014-05-13 16:57:08 +08:00 committed by Takashi Iwai
parent ec5fe98886
commit 7189eb9b8f
1 changed files with 6 additions and 0 deletions
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6
sound/pci/hda/hda_intel.c
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@ -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);