linux-kernel - [PATCH v2 02/15] drm/bridge: tc358767: Simplify polling in tc_main_link

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Date:   Thu, 21 Mar 2019 20:28:48 -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 02/15] drm/bridge: tc358767: Simplify polling in tc_main_link_setup()

Replace explicit polling loop with equivalent call to
tc_poll_timeout() for brevity. No functional change intended.

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 | 15 +++++----------
 1 file changed, 5 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
index 89a4392dfa35..2531f4dadbf8 100644
--- a/drivers/gpu/drm/bridge/tc358767.c
+++ b/drivers/gpu/drm/bridge/tc358767.c
@@ -761,7 +761,6 @@ static int tc_main_link_enable(struct tc_data *tc)
 	struct device *dev = tc->dev;
 	unsigned int rate;
 	u32 dp_phy_ctrl;
-	int timeout;
 	u32 value;
 	int ret;
 	u8 tmp[8];
@@ -817,15 +816,11 @@ static int tc_main_link_enable(struct tc_data *tc)
 	dp_phy_ctrl &= ~(DP_PHY_RST | PHY_M1_RST | PHY_M0_RST);
 	tc_write(DP_PHY_CTRL, dp_phy_ctrl);
 
-	timeout = 1000;
-	do {
-		tc_read(DP_PHY_CTRL, &value);
-		udelay(1);
-	} while ((!(value & PHY_RDY)) && (--timeout));
-
-	if (timeout == 0) {
-		dev_err(dev, "timeout waiting for phy become ready");
-		return -ETIMEDOUT;
+	ret = tc_poll_timeout(tc, DP_PHY_CTRL, PHY_RDY, PHY_RDY, 1, 1000);
+	if (ret) {
+		if (ret == -ETIMEDOUT)
+			dev_err(dev, "timeout waiting for phy become ready");
+		return ret;
 	}
 
 	/* Set misc: 8 bits per color */
-- 
2.20.1