gma500: udelay(20000) it too long again

so replace it with mdelay(20).

Fixes build error:

  ERROR: "__bad_udelay" [drivers/staging/gma500/psb_gfx.ko] undefined!

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/staging/gma500/mrst_hdmi.c b/drivers/staging/gma500/mrst_hdmi.c
index d6a517971ba..e66607eb3d3 100644
--- a/drivers/staging/gma500/mrst_hdmi.c
+++ b/drivers/staging/gma500/mrst_hdmi.c
@@ -129,7 +129,7 @@ static void wait_for_vblank(struct drm_device *dev)
 {
         /* FIXME: Can we do this as a sleep ? */
         /* Wait for 20ms, i.e. one cycle at 50hz. */
-        udelay(20000);
+        mdelay(20);
 }
 
 static void scu_busy_loop(void *scu_base)