linux-kernel - [PATCH v2 03/15] drm/bridge: tc358767: Simplify polling in tc_link

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Date:   Thu, 21 Mar 2019 20:28:49 -0700
From:   Andrey Smirnov <andrew.smirnov@...il.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     Andrey Smirnov <andrew.smirnov@...il.com>,
        Archit Taneja <architt@...eaurora.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        Andrey Gusakov <andrey.gusakov@...entembedded.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Chris Healy <cphealy@...il.com>,
        Lucas Stach <l.stach@...gutronix.de>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 03/15] 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@...il.com>
Cc: Archit Taneja <architt@...eaurora.org>
Cc: Andrzej Hajda <a.hajda@...sung.com>
Cc: Laurent Pinchart <Laurent.pinchart@...asonboard.com>
Cc: Tomi Valkeinen <tomi.valkeinen@...com>
Cc: Andrey Gusakov <andrey.gusakov@...entembedded.com>
Cc: Philipp Zabel <p.zabel@...gutronix.de>
Cc: Chris Healy <cphealy@...il.com>
Cc: Lucas Stach <l.stach@...gutronix.de>
Cc: dri-devel@...ts.freedesktop.org
Cc: linux-kernel@...r.kernel.org
---
 drivers/gpu/drm/bridge/tc358767.c | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
index 2531f4dadbf8..38d542f553cd 100644
--- a/drivers/gpu/drm/bridge/tc358767.c
+++ b/drivers/gpu/drm/bridge/tc358767.c
@@ -733,21 +733,18 @@ static int tc_set_video_mode(struct tc_data *tc, struct drm_display_mode *mode)
 
 static int tc_wait_link_training(struct tc_data *tc, u32 *error)
 {
-	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");
-		ret = -ETIMEDOUT;
 		goto err;
 	}
 
+	tc_read(DP0_LTSTAT, &value);
+
 	*error = (value >> 8) & 0x7;
 
 	return 0;
-- 
2.20.1