drm/bridge: tc358767: Simplify polling in tc_link_training()

Replace explicit polling in tc_link_training() with equivalent call to
tc_poll_timeout() for simplicity. No functional change intended (not
including slightly altered debug output).

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc: Andrzej Hajda <a.hajda@samsung.com>
Cc: Laurent Pinchart <Laurent.pinchart@ideasonboard.com>
Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc: Andrey Gusakov <andrey.gusakov@cogentembedded.com>
Cc: Philipp Zabel <p.zabel@pengutronix.de>
Cc: Cory Tusar <cory.tusar@zii.aero>
Cc: Chris Healy <cphealy@gmail.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: dri-devel@lists.freedesktop.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190619052716.16831-4-andrew.smirnov@gmail.com

diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
index 109085c..0270d18 100644 (file)
--- a/drivers/gpu/drm/bridge/tc358767.c
+++ b/drivers/gpu/drm/bridge/tc358767.c
@@ -739,22 +739,19 @@ err:
 
 static int tc_wait_link_training(struct tc_data *tc)
 {
-       u32 timeout = 1000;
        u32 value;
        int ret;
 
-       do {
-               udelay(1);
-               tc_read(DP0_LTSTAT, &value);
-       } while ((!(value & LT_LOOPDONE)) && (--timeout));
-
-       if (timeout == 0) {
+       ret = tc_poll_timeout(tc, DP0_LTSTAT, LT_LOOPDONE,
+                             LT_LOOPDONE, 1, 1000);
+       if (ret) {
                dev_err(tc->dev, "Link training timeout waiting for LT_LOOPDONE!\n");
-               return -ETIMEDOUT;
+               return ret;
        }
 
-       return (value >> 8) & 0x7;
+       tc_read(DP0_LTSTAT, &value);
 
+       return (value >> 8) & 0x7;
 err:
        return ret;
 }