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From:   Andrey Smirnov <andrew.smirnov@gmail.com>
To:     dri-devel@lists.freedesktop.org
Cc:     Andrey Smirnov <andrew.smirnov@gmail.com>,
        Andrzej Hajda <a.hajda@samsung.com>,
        Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
        Tomi Valkeinen <tomi.valkeinen@ti.com>,
        Andrey Gusakov <andrey.gusakov@cogentembedded.com>,
        Philipp Zabel <p.zabel@pengutronix.de>,
        Cory Tusar <cory.tusar@zii.aero>,
        Chris Healy <cphealy@gmail.com>,
        Lucas Stach <l.stach@pengutronix.de>,
        linux-kernel@vger.kernel.org
Subject: [PATCH v6 03/15] drm/bridge: tc358767: Simplify polling in tc_link_training()
Date:   Tue, 18 Jun 2019 22:27:04 -0700
Message-Id: <20190619052716.16831-4-andrew.smirnov@gmail.com>
In-Reply-To: <20190619052716.16831-1-andrew.smirnov@gmail.com>
References: <20190619052716.16831-1-andrew.smirnov@gmail.com>
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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>
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
---
 drivers/gpu/drm/bridge/tc358767.c | 15 ++++++---------
 1 file changed, 6 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
index f463ef6d4271..31f5045e7e42 100644
--- a/drivers/gpu/drm/bridge/tc358767.c
+++ b/drivers/gpu/drm/bridge/tc358767.c
@@ -748,22 +748,19 @@ static int tc_set_video_mode(struct tc_data *tc,
 
 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;
 }
-- 
2.21.0