drm/radeon/kms: use udelay for short delays

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

Cc: stable@kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/gpu/drm/radeon/atom.c b/drivers/gpu/drm/radeon/atom.c
index 2a3df5599ab4..7f152f66f196 100644
--- a/drivers/gpu/drm/radeon/atom.c
+++ b/drivers/gpu/drm/radeon/atom.c
@@ -643,7 +643,7 @@ 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));
 }