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 <[email protected]> Acked-by: Takashi Iwai <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
chewitt · Jan 6, 2008 · 57a0451 · 57a0451
1 parent 3fee37c
commit 57a0451
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
@@ -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) {