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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-phy" Errors-To: linux-phy-bounces+linux-phy=archiver.kernel.org@lists.infradead.org This is to resolve the problem of wakeup system by USB3 device insertion if HSIOMIX on, in that case, the USB3 device detects RX term on so the USB3 device doesn't downgrade to high-speed, we can't expect CONN wakeup (for USB3) happen because the 24MHz OSC is required ON to trigger it. Because the device works at Super-speed so DP/DM wakeup can't happen either. Then the entire systen can't be waken up by such device attach event. With this override bit we can force the RX term off when enters system suspend, and disable the override after system resume. Therefore, the USB3 device will always downgrade to High-speed, then DP/DM wakeup can always happen. It will correctly switch to Super-speed later when the host reset it after the system resume back. Signed-off-by: Li Jun Signed-off-by: Xu Yang --- Changes in v3: - remove CamelCase style in title Changes in v2: - rephase the message --- drivers/phy/freescale/phy-fsl-imx8mq-usb.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/drivers/phy/freescale/phy-fsl-imx8mq-usb.c b/drivers/phy/freescale/phy-fsl-imx8mq-usb.c index f33eef218db1..e9c113edd470 100644 --- a/drivers/phy/freescale/phy-fsl-imx8mq-usb.c +++ b/drivers/phy/freescale/phy-fsl-imx8mq-usb.c @@ -54,6 +54,7 @@ #define PHY_CTRL5_PCS_TX_SWING_FULL_MASK GENMASK(6, 0) #define PHY_CTRL6 0x18 +#define PHY_CTRL6_RXTERM_OVERRIDE_SEL BIT(29) #define PHY_CTRL6_ALT_CLK_EN BIT(1) #define PHY_CTRL6_ALT_CLK_SEL BIT(0) @@ -699,6 +700,7 @@ static int imx8mp_usb_phy_init(struct phy *phy) static int imx8mq_phy_power_on(struct phy *phy) { struct imx8mq_usb_phy *imx_phy = phy_get_drvdata(phy); + u32 value; int ret; ret = regulator_enable(imx_phy->vbus); @@ -715,12 +717,23 @@ static int imx8mq_phy_power_on(struct phy *phy) return ret; } - return ret; + /* Disable rx term override */ + value = readl(imx_phy->base + PHY_CTRL6); + value &= ~PHY_CTRL6_RXTERM_OVERRIDE_SEL; + writel(value, imx_phy->base + PHY_CTRL6); + + return 0; } static int imx8mq_phy_power_off(struct phy *phy) { struct imx8mq_usb_phy *imx_phy = phy_get_drvdata(phy); + u32 value; + + /* Override rx term to be 0 */ + value = readl(imx_phy->base + PHY_CTRL6); + value |= PHY_CTRL6_RXTERM_OVERRIDE_SEL; + writel(value, imx_phy->base + PHY_CTRL6); clk_disable_unprepare(imx_phy->alt_clk); clk_disable_unprepare(imx_phy->clk); -- 2.34.1 -- linux-phy mailing list linux-phy@lists.infradead.org https://lists.infradead.org/mailman/listinfo/linux-phy