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Message-ID: <20071116125824.GA28082@elte.hu>
Date: Fri, 16 Nov 2007 13:58:24 +0100
From: Ingo Molnar <mingo@...e.hu>
To: Mark Lord <lkml@....ca>, perex@...ex.cz,
Takashi Iwai <tiwai@...e.de>
Cc: Pavel Machek <pavel@....cz>, Mark Lord <liml@....ca>,
Thomas Gleixner <tglx@...utronix.de>, len.brown@...el.com,
Andrew Morton <akpm@...ux-foundation.org>,
linux-kernel@...r.kernel.org, linux-pm@...ts.linux-foundation.org,
rjw@...k.pl, Len Brown <lenb@...nel.org>
Subject: [patch] snd hda suspend latency: shorten codec read
snd hda suspend latency goes down a second via the patch below.
Ingo
------------->
Subject: snd hda suspend latency: shorten codec read
From: Ingo Molnar <mingo@...e.hu>
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@...e.hu>
---
sound/pci/hda/hda_intel.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
Index: linux/sound/pci/hda/hda_intel.c
===================================================================
--- linux.orig/sound/pci/hda/hda_intel.c
+++ linux/sound/pci/hda/hda_intel.c
@@ -555,7 +555,8 @@ static unsigned int azx_rirb_get_respons
}
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) {
-
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