drm/radeon: replace udelay with mdelay for long timeouts

Some architectures require that delays longer than a few
miliseconds are called through mdelay. This was triggered
on ARM randconfig builds.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/radeon/r600_cp.c b/drivers/gpu/drm/radeon/r600_cp.c
index 84c5462..75ed17c 100644
--- a/drivers/gpu/drm/radeon/r600_cp.c
+++ b/drivers/gpu/drm/radeon/r600_cp.c
@@ -407,7 +407,7 @@
 
 	RADEON_WRITE(R600_GRBM_SOFT_RESET, R600_SOFT_RESET_CP);
 	RADEON_READ(R600_GRBM_SOFT_RESET);
-	DRM_UDELAY(15000);
+	mdelay(15);
 	RADEON_WRITE(R600_GRBM_SOFT_RESET, 0);
 
 	fw_data = (const __be32 *)dev_priv->me_fw->data;
@@ -500,7 +500,7 @@
 
 	RADEON_WRITE(R600_GRBM_SOFT_RESET, R600_SOFT_RESET_CP);
 	RADEON_READ(R600_GRBM_SOFT_RESET);
-	DRM_UDELAY(15000);
+	mdelay(15);
 	RADEON_WRITE(R600_GRBM_SOFT_RESET, 0);
 
 	fw_data = (const __be32 *)dev_priv->pfp_fw->data;
@@ -1797,7 +1797,7 @@
 
 	RADEON_WRITE(R600_GRBM_SOFT_RESET, R600_SOFT_RESET_CP);
 	RADEON_READ(R600_GRBM_SOFT_RESET);
-	DRM_UDELAY(15000);
+	mdelay(15);
 	RADEON_WRITE(R600_GRBM_SOFT_RESET, 0);