From: Dave Airlie <airlied@redhat.com>
Date: Sat, 30 Jan 2010 21:07:14 +0000 (+1000)
Subject: drm/radeon/kms: use udelay for short delays
X-Git-Tag: firefly_0821_release~11625^2~9
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=2acc8d9f806fad17c81c91b3266775b78894f252;p=firefly-linux-kernel-4.4.55.git

drm/radeon/kms: use udelay for short delays

commit 01d4503968f471f876fb44335800d2cf8dc5a2ce upstream.

For usec delays use udelay instead of scheduling, this should
allow reclocking to happen faster. This also was the cause
of reported 33s delays at bootup on certain systems.

fixes: freedesktop.org bug 25506

Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/drivers/gpu/drm/radeon/atom.c b/drivers/gpu/drm/radeon/atom.c
index d67c42555ab9..fed2291139c1 100644
--- a/drivers/gpu/drm/radeon/atom.c
+++ b/drivers/gpu/drm/radeon/atom.c
@@ -607,7 +607,7 @@ static void atom_op_delay(atom_exec_context *ctx, int *ptr, int arg)
 	uint8_t count = U8((*ptr)++);
 	SDEBUG("   count: %d\n", count);
 	if (arg == ATOM_UNIT_MICROSEC)
-		schedule_timeout_uninterruptible(usecs_to_jiffies(count));
+		udelay(count);
 	else
 		schedule_timeout_uninterruptible(msecs_to_jiffies(count));
 }