linux-kernel - [PATCH AUTOSEL 6.6 07/11] phy: starfive: jh7110-usb: Fix USB 2.0 host occasional detection failure

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Message-Id: <20250519212237.1986368-7-sashal@kernel.org>
Date: Mon, 19 May 2025 17:22:33 -0400
From: Sasha Levin <sashal@...nel.org>
To: patches@...ts.linux.dev,
	stable@...r.kernel.org
Cc: Hal Feng <hal.feng@...rfivetech.com>,
	Vinod Koul <vkoul@...nel.org>,
	Sasha Levin <sashal@...nel.org>,
	kishon@...com,
	linux-kernel@...r.kernel.org
Subject: [PATCH AUTOSEL 6.6 07/11] phy: starfive: jh7110-usb: Fix USB 2.0 host occasional detection failure

From: Hal Feng <hal.feng@...rfivetech.com>

[ Upstream commit 3f097adb9b6c804636bcf8d01e0e7bc037bee0d3 ]

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>
Link: https://lore.kernel.org/r/20250422101244.51686-1-hal.feng@starfivetech.com
Signed-off-by: Vinod Koul <vkoul@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 633912f8a05d0..bf52b41110db8 100644
--- a/drivers/phy/starfive/phy-jh7110-usb.c
+++ b/drivers/phy/starfive/phy-jh7110-usb.c
@@ -16,6 +16,8 @@
 #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)
 
@@ -68,6 +70,7 @@ 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)
@@ -77,6 +80,10 @@ 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;
 }
 
-- 
2.39.5