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From: Elson Serrao <elson.serrao@oss.qualcomm.com>
To: Vinod Koul <vkoul@kernel.org>,
	Konrad Dybcio <konradybcio@kernel.org>,
	Neil Armstrong <neil.armstrong@linaro.org>,
	Wesley Cheng <quic_wcheng@quicinc.com>,
	Johan Hovold <johan+linaro@kernel.org>,
	Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Cc: linux-arm-msm@vger.kernel.org, linux-phy@lists.infradead.org,
	linux-kernel@vger.kernel.org, stable@vger.kernel.org
Subject: [PATCH] phy: qcom: m31-eusb2: clear PLL_EN during init
Date: Tue, 17 Feb 2026 12:11:30 -0800	[thread overview]
Message-ID: <20260217201130.2804550-1-elson.serrao@oss.qualcomm.com> (raw)

The driver currently sets bit 0 of USB_PHY_CFG1 (PLL_EN) during PHY
initialization. According to the M31 EUSB2 PHY hardware documentation,
this bit is intended only for test/debug scenarios and does not control
mission mode operation. Keeping PLL_EN asserted causes the PHY to draw
additional current during USB bus suspend. Clearing this bit results in
lower suspend power consumption without affecting normal operation.

Update the driver to leave PLL_EN cleared as recommended by the hardware
documentation.

Fixes: 9c8504861cc4 ("phy: qcom: Add M31 based eUSB2 PHY driver")
Cc: stable@vger.kernel.org
Signed-off-by: Elson Serrao <elson.serrao@oss.qualcomm.com>
---
 drivers/phy/qualcomm/phy-qcom-m31-eusb2.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/phy/qualcomm/phy-qcom-m31-eusb2.c b/drivers/phy/qualcomm/phy-qcom-m31-eusb2.c
index 95cd3175926d..68f1ba8fec4a 100644
--- a/drivers/phy/qualcomm/phy-qcom-m31-eusb2.c
+++ b/drivers/phy/qualcomm/phy-qcom-m31-eusb2.c
@@ -83,7 +83,7 @@ static const struct m31_phy_tbl_entry m31_eusb2_setup_tbl[] = {
 	M31_EUSB_PHY_INIT_CFG(USB_PHY_CFG0, UTMI_PHY_CMN_CTRL_OVERRIDE_EN, 1),
 	M31_EUSB_PHY_INIT_CFG(USB_PHY_UTMI_CTRL5, POR, 1),
 	M31_EUSB_PHY_INIT_CFG(USB_PHY_HS_PHY_CTRL_COMMON0, PHY_ENABLE, 1),
-	M31_EUSB_PHY_INIT_CFG(USB_PHY_CFG1, PLL_EN, 1),
+	M31_EUSB_PHY_INIT_CFG(USB_PHY_CFG1, PLL_EN, 0),
 	M31_EUSB_PHY_INIT_CFG(USB_PHY_FSEL_SEL, FSEL_SEL, 1),
 };
 
-- 
2.34.1


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             reply	other threads:[~2026-02-17 20:11 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-02-17 20:11 Elson Serrao [this message]
2026-02-18 10:58 ` [PATCH] phy: qcom: m31-eusb2: clear PLL_EN during init Konrad Dybcio
2026-02-27 15:29 ` Vinod Koul

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