From 57a04513cb35086d54bcb2cb92e6627fc8fa0fae Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Sun, 6 Jan 2008 21:09:53 +0100 Subject: [PATCH] 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 Acked-by: Takashi Iwai Signed-off-by: Linus Torvalds --- sound/pci/hda/hda_intel.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c index 3fa0f97..62b9fb3 100644 --- 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) { -- 2.7.4