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| author | Hal Feng <hal.feng@starfivetech.com> | 2025-04-22 18:12:44 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-06-04 14:45:10 +0200 |
| commit | 38ef594fe59770770506ec3cdbae07a2f36995c6 (patch) | |
| tree | 5b9ababea037a0434a1d6f1badc128e3349caecb | |
| parent | 4235aa3629dc1ea851fb02a1cdfb0f91738b98e3 (diff) | |
| download | linux-38ef594fe59770770506ec3cdbae07a2f36995c6.tar.gz linux-38ef594fe59770770506ec3cdbae07a2f36995c6.tar.bz2 linux-38ef594fe59770770506ec3cdbae07a2f36995c6.zip | |
phy: starfive: jh7110-usb: Fix USB 2.0 host occasional detection failure
[ 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@starfivetech.com>
Link: https://lore.kernel.org/r/20250422101244.51686-1-hal.feng@starfivetech.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/phy/starfive/phy-jh7110-usb.c | 7 |
1 files changed, 7 insertions, 0 deletions
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; } |