linux-kernel - [PATCH v1] phy: starfive: jh7110-usb: Fix USB 2.0 host occasional detection failure

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Message-ID: <20250422101244.51686-1-hal.feng@starfivetech.com>
Date: Tue, 22 Apr 2025 18:12:44 +0800
From: Hal Feng <hal.feng@...rfivetech.com>
To: Vinod Koul <vkoul@...nel.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Minda Chen <minda.chen@...rfivetech.com>
Cc: Hal Feng <hal.feng@...rfivetech.com>,
	linux-phy@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v1] phy: starfive: jh7110-usb: Fix USB 2.0 host occasional detection failure

JH7110 USB 2.0 host fails to detect USB 2.0 devices occasionally. With a
long time of debugging and testing, we found that setting Rx clock gating
control signal to normal power consumption mode can solve this problem.

Signed-off-by: Hal Feng <hal.feng@...rfivetech.com>
---
 drivers/phy/starfive/phy-jh7110-usb.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/phy/starfive/phy-jh7110-usb.c b/drivers/phy/starfive/phy-jh7110-usb.c
index cb5454fbe2c8..b505d89860b4 100644
--- a/drivers/phy/starfive/phy-jh7110-usb.c
+++ b/drivers/phy/starfive/phy-jh7110-usb.c
@@ -18,6 +18,8 @@
 #include <linux/usb/of.h>
 
 #define USB_125M_CLK_RATE		125000000
+#define USB_CLK_MODE_OFF		0x0
+#define USB_CLK_MODE_RX_NORMAL_PWR	BIT(1)
 #define USB_LS_KEEPALIVE_OFF		0x4
 #define USB_LS_KEEPALIVE_ENABLE		BIT(4)
 
@@ -78,6 +80,7 @@ static int jh7110_usb2_phy_init(struct phy *_phy)
 {
 	struct jh7110_usb2_phy *phy = phy_get_drvdata(_phy);
 	int ret;
+	unsigned int val;
 
 	ret = clk_set_rate(phy->usb_125m_clk, USB_125M_CLK_RATE);
 	if (ret)
@@ -87,6 +90,10 @@ static int jh7110_usb2_phy_init(struct phy *_phy)
 	if (ret)
 		return ret;
 
+	val = readl(phy->regs + USB_CLK_MODE_OFF);
+	val |= USB_CLK_MODE_RX_NORMAL_PWR;
+	writel(val, phy->regs + USB_CLK_MODE_OFF);
+
 	return 0;
 }
 

base-commit: a33b5a08cbbdd7aadff95f40cbb45ab86841679e
-- 
2.43.2