drm/vc4: Replace long HDMI udelay with usleep_range

Since we aren't in atomic context replace this long udelay with a
usleep_range.

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Eric Anholt <eric@anholt.net>
Link: https://patchwork.freedesktop.org/patch/msgid/1519475894-11701-1-git-send-email-stefan.wahren@i2se.com

diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index 984501e..1a6db29 100644 (file)
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -681,7 +681,7 @@ static void vc4_hdmi_encoder_enable(struct drm_encoder *encoder)
                           drift & ~VC4_HDMI_FIFO_CTL_RECENTER);
                HDMI_WRITE(VC4_HDMI_FIFO_CTL,
                           drift | VC4_HDMI_FIFO_CTL_RECENTER);
-               udelay(1000);
+               usleep_range(1000, 1100);
                HDMI_WRITE(VC4_HDMI_FIFO_CTL,
                           drift & ~VC4_HDMI_FIFO_CTL_RECENTER);
                HDMI_WRITE(VC4_HDMI_FIFO_CTL,