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hda_intel suspend latency: shorten codec read 

not sleeping for every codec read/write but doing a short udelay and
a conditional reschedule has cut suspend+resume latency by about 1
second on my T60.

The patch also fixes the unexpected codec-connection errors that
happen more often in the new power-save mode:
    http://lkml.org/lkml/2007/11/8/255
    http://bugzilla.kernel.org/show_bug.cgi?id=9332

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ingo Molnar 2008-01-06 21:09:53 +01:00 committed by Linus Torvalds
parent 3fee37c1e2
commit 57a04513cb
1 changed files with 2 additions and 1 deletions
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3
sound/pci/hda/hda_intel.c
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@ -555,7 +555,8 @@ static unsigned int azx_rirb_get_response(struct hda_codec *codec)
}
if (!chip->rirb.cmds)
return chip->rirb.res; /* the last value */
schedule_timeout_uninterruptible(1);
udelay(10);
cond_resched();
} while (time_after_eq(timeout, jiffies));
if (chip->msi) {