ALSA: hda - use LPIB for delay estimation

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DMA Position in Buffer (DPIB) should be used for
ring buffer management, while LPIB register provides
information on the number of samples transfered on
the link. The difference between the two pieces of
information corresponds to hardware/DMA buffering.

This patch reports this difference in runtime->delay, and
removes the use of the COMBO mode on recent Intel hardware.

Credits to Takashi Iwai for an initial patch.

[rebased to for-next branch and replaced snd_printk() with
 snd_printdd() by tiwai]

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

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This commit is contained in:

Pierre-Louis Bossart 2012-09-21 18:39:06 -05:00 • committed by Takashi Iwai

parent 172d3b2096

commit 90accc58a6

1 changed files with 29 additions and 7 deletions

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sound/pci/hda/hda_intel.c

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