linux-kernel - [PATCH V2 net-next 4/4] net: phy: realtek: add delay to fix RXC generation issue

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Message-Id: <20210608030034.3113-5-qiangqing.zhang@nxp.com>
Date:   Tue,  8 Jun 2021 11:00:34 +0800
From:   Joakim Zhang <qiangqing.zhang@....com>
To:     davem@...emloft.net, kuba@...nel.org, robh+dt@...nel.org,
        andrew@...n.ch, hkallweit1@...il.com, linux@...linux.org.uk,
        f.fainelli@...il.com, Jisheng.Zhang@...aptics.com
Cc:     linux-imx@....com, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH V2 net-next 4/4] net: phy: realtek: add delay to fix RXC generation issue

PHY will delay about 11.5ms to generate RXC clock when switching from
power down to normal operation. Read/write registers would also cause RXC
become unstable and stop for a while during this process. Realtek engineer
suggests 15ms or more delay can workaround this issue.

Signed-off-by: Joakim Zhang <qiangqing.zhang@....com>
---
 drivers/net/phy/realtek.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/net/phy/realtek.c b/drivers/net/phy/realtek.c
index 79dc55bb4091..1b844a06fe72 100644
--- a/drivers/net/phy/realtek.c
+++ b/drivers/net/phy/realtek.c
@@ -410,6 +410,19 @@ static int rtl8211f_config_init(struct phy_device *phydev)
 	return genphy_soft_reset(phydev);
 }
 
+static int rtl821x_resume(struct phy_device *phydev)
+{
+	int ret;
+
+	ret = genphy_resume(phydev);
+	if (ret < 0)
+		return ret;
+
+	msleep(20);
+
+	return 0;
+}
+
 static int rtl8211e_config_init(struct phy_device *phydev)
 {
 	int ret = 0, oldpage;
@@ -906,7 +919,7 @@ static struct phy_driver realtek_drvs[] = {
 		.config_intr	= &rtl8211f_config_intr,
 		.handle_interrupt = rtl8211f_handle_interrupt,
 		.suspend	= genphy_suspend,
-		.resume		= genphy_resume,
+		.resume		= rtl821x_resume,
 		.read_page	= rtl821x_read_page,
 		.write_page	= rtl821x_write_page,
 	}, {
-- 
2.17.1