diff options
| author | Xu Yang <xu.yang_2@nxp.com> | 2025-12-19 16:13:54 +0800 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2025-12-23 23:11:03 +0530 |
| commit | c9d03933ea161a5543e15857ee519c60ec04fe9b (patch) | |
| tree | 5491f59871018504e5729f0e00f9efcb5d87e9e7 /drivers | |
| parent | caad07ae07e3fb173e804abdd53fb96aa7186830 (diff) | |
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 <jun.li@nxp.com>
Signed-off-by: Xu Yang <xu.yang_2@nxp.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20251219081354.3806806-1-xu.yang_2@nxp.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/phy/freescale/phy-fsl-imx8mq-usb.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/phy/freescale/phy-fsl-imx8mq-usb.c b/drivers/phy/freescale/phy-fsl-imx8mq-usb.c index ad8a55012e42..64efa49945e3 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); |