From c9d03933ea161a5543e15857ee519c60ec04fe9b Mon Sep 17 00:00:00 2001 From: Xu Yang Date: Fri, 19 Dec 2025 16:13:54 +0800 Subject: [PATCH] phy: fsl-imx8mq-usb: change ssc_range value for i.MX8MQ According to IC engineer suggestion, set ssc_range as -4003 ppm will have more tolerance for EMI, and suitable for more boards. Besides, it's confirmed that with this setting the TX SSC test will pass on one customer board. Signed-off-by: Li Jun Signed-off-by: Xu Yang Reviewed-by: Frank Li Link: https://patch.msgid.link/20251219081354.3806806-1-xu.yang_2@nxp.com Signed-off-by: Vinod Koul --- drivers/phy/freescale/phy-fsl-imx8mq-usb.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/phy/freescale/phy-fsl-imx8mq-usb.c b/drivers/phy/freescale/phy-fsl-imx8mq-usb.c index ad8a55012e42f..64efa49945e33 100644 --- a/drivers/phy/freescale/phy-fsl-imx8mq-usb.c +++ b/drivers/phy/freescale/phy-fsl-imx8mq-usb.c @@ -17,6 +17,10 @@ #define PHY_CTRL0_FSEL_MASK GENMASK(10, 5) #define PHY_CTRL0_FSEL_24M 0x2a #define PHY_CTRL0_FSEL_100M 0x27 +#define PHY_CTRL0_SSC_RANGE_MASK GENMASK(23, 21) +#define PHY_CTRL0_SSC_RANGE_4003PPM 0x2 +#define PHY_CTRL0_SSC_RANGE_4492PPM 0x1 +#define PHY_CTRL0_SSC_RANGE_4980PPM 0x0 #define PHY_CTRL1 0x4 #define PHY_CTRL1_RESET BIT(0) @@ -600,6 +604,9 @@ static int imx8mp_usb_phy_init(struct phy *phy) value = readl(imx_phy->base + PHY_CTRL0); value |= PHY_CTRL0_REF_SSP_EN; + value &= ~PHY_CTRL0_SSC_RANGE_MASK; + value |= FIELD_PREP(PHY_CTRL0_SSC_RANGE_MASK, + PHY_CTRL0_SSC_RANGE_4003PPM); writel(value, imx_phy->base + PHY_CTRL0); value = readl(imx_phy->base + PHY_CTRL2); -- 2.47.3