[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 (file)
--- 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) {