From: Ingo Molnar <mingo@elte.hu>
Date: Fri, 16 Nov 2007 14:20:28 +0000 (+0100)
Subject: [ALSA] snd hda suspend latency: shorten codec read
X-Git-Tag: v2.6.25-rc1~1127^2~237
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=9b1fffddc80949fb4aa93fdcc57544bc2108ced3;p=platform%2Fkernel%2Flinux-3.10.git

[ALSA] snd hda 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.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
---

diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index 38c5916..41edf85 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -561,7 +561,8 @@ 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) {