From: Takashi Iwai <tiwai@suse.de>
Date: Fri, 16 May 2008 10:34:47 +0000 (+0200)
Subject: [ALSA] hda - Fix DMA position inaccuracy
X-Git-Tag: v2.6.27-rc1~1111^2~150
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9ad593f6d326e7a4664e3856520f6c042f82a37f;p=pandora-kernel.git

[ALSA] hda - Fix DMA position inaccuracy

Many HD-audio controllers seem inaccurate about the IRQ timing of
PCM period updates.  This has caused problems on audio quality; e.g.
JACK doesn't work with two periods.

This patch fixes the problem by checking the current DMA position
at IRQ handler and delays the period-update via a workq if it's
inaccurate.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
---

Reading git-diff-tree failed