linux-kernel - [PATCH v4 2/5] staging: hikey9xx: phy-hi3670-usb3: adjust retry logic

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Message-Id: <b653d7d6073de176598a5026c41b1a845f360c9e.1611052729.git.mchehab+huawei@kernel.org>
Date:   Tue, 19 Jan 2021 11:44:40 +0100
From:   Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
To:     Vinod Koul <vkoul@...nel.org>, Rob Herring <robh+dt@...nel.org>
Cc:     Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Alex Dewar <alex.dewar90@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Yu Chen <chenyu56@...wei.com>, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v4 2/5] staging: hikey9xx: phy-hi3670-usb3: adjust retry logic

Instead of running a loop up to 100k times, add a small
delay inside it, running it up to 10 times, waiting up
to 100-200 us.

It should be noticed that I don't have the datasheet for
this PHY. So, not sure if this time will cover all
situations.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
---
 drivers/staging/hikey9xx/phy-hi3670-usb3.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/hikey9xx/phy-hi3670-usb3.c b/drivers/staging/hikey9xx/phy-hi3670-usb3.c
index 722cabaa9bd9..cffe6c58dfd7 100644
--- a/drivers/staging/hikey9xx/phy-hi3670-usb3.c
+++ b/drivers/staging/hikey9xx/phy-hi3670-usb3.c
@@ -185,7 +185,7 @@ static int hi3670_phy_cr_start(struct regmap *usb31misc, int direction)
 static int hi3670_phy_cr_wait_ack(struct regmap *usb31misc)
 {
 	u32 reg;
-	int retry = 100000;
+	int retry = 10;
 	int ret;
 
 	while (retry-- > 0) {
@@ -198,6 +198,8 @@ static int hi3670_phy_cr_wait_ack(struct regmap *usb31misc)
 		ret = hi3670_phy_cr_clk(usb31misc);
 		if (ret)
 			return ret;
+
+		usleep_range(10, 20);
 	}
 
 	return -ETIMEDOUT;
-- 
2.29.2