On 05-05-23, 14:52, Frank Li wrote:
> Add usb2-disconnect-threshold-microvolt property to address fake USB
> disconnection issue during enumeration or suspend state for difference
> platform.
>
> Signed-off-by: Frank Li <Frank.Li@xxxxxxx>
> ---
> arch/arm64/boot/dts/freescale/imx8x-mek.dtsi | 1 +
> drivers/phy/cadence/phy-cadence-salvo.c | 30 +++++++++++++++++++-
> 2 files changed, 30 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm64/boot/dts/freescale/imx8x-mek.dtsi b/arch/arm64/boot/dts/freescale/imx8x-mek.dtsi
> index 2f8fe59fc131..6a396844c02d 100644
> --- a/arch/arm64/boot/dts/freescale/imx8x-mek.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8x-mek.dtsi
> @@ -1051,6 +1051,7 @@ &usbotg1 {
>
> &usb3_phy {
> status = "okay";
> + usb2-disconnect-threshold-microvolt = <645>;
> };
>
> &usbotg3 {
> diff --git a/drivers/phy/cadence/phy-cadence-salvo.c b/drivers/phy/cadence/phy-cadence-salvo.c
> index 23be27a747a9..06e705dbbc3c 100644
> --- a/drivers/phy/cadence/phy-cadence-salvo.c
> +++ b/drivers/phy/cadence/phy-cadence-salvo.c
> @@ -5,7 +5,7 @@
> *
> * Copyright (c) 2019-2020 NXP
> */
> -
why this change?
> +#include <linux/bitfield.h>
> #include <linux/clk.h>
> #include <linux/io.h>
> #include <linux/module.h>
> @@ -91,9 +91,19 @@
>
> /* USB2 PHY register definition */
> #define UTMI_REG15 0xaf
> +#define UTMI_AFE_RX_REG0 0x0d
> #define UTMI_AFE_RX_REG5 0x12
> #define UTMI_AFE_BC_REG4 0x29
>
> +/* Align UTMI_AFE_RX_REG0 bit[7:6] define */
> +enum usb2_disconn_threshold {
> + USB2_DISCONN_THRESHOLD_575 = 0x0,
> + USB2_DISCONN_THRESHOLD_610 = 0x1,
> + USB2_DISCONN_THRESHOLD_645 = 0x3,
> +};
> +
> +#define RX_USB2_DISCONN_MASK GENMASK(7, 6)
> +
> /* TB_ADDR_TX_RCVDETSC_CTRL */
> #define RXDET_IN_P3_32KHZ BIT(0)
> /*
> @@ -125,6 +135,7 @@ struct cdns_salvo_phy {
> struct clk *clk;
> void __iomem *base;
> struct cdns_salvo_data *data;
> + enum usb2_disconn_threshold usb2_disconn;
> };
>
> static const struct of_device_id cdns_salvo_phy_of_match[];
> @@ -261,6 +272,12 @@ static int cdns_salvo_phy_init(struct phy *phy)
>
> cdns_salvo_write(salvo_phy, USB2_PHY_OFFSET, UTMI_AFE_RX_REG5,
> 0x5);
> +
> + value = cdns_salvo_read(salvo_phy, USB2_PHY_OFFSET, UTMI_AFE_RX_REG0);
> + value &= ~RX_USB2_DISCONN_MASK;
> + value = FIELD_PREP(RX_USB2_DISCONN_MASK, salvo_phy->usb2_disconn);
> + cdns_salvo_write(salvo_phy, USB2_PHY_OFFSET, UTMI_AFE_RX_REG0, value);
> +
> udelay(10);
>
> clk_disable_unprepare(salvo_phy->clk);
> @@ -315,6 +332,7 @@ static int cdns_salvo_phy_probe(struct platform_device *pdev)
> struct device *dev = &pdev->dev;
> struct cdns_salvo_phy *salvo_phy;
> struct cdns_salvo_data *data;
> + u32 val;
>
> data = (struct cdns_salvo_data *)of_device_get_match_data(dev);
> salvo_phy = devm_kzalloc(dev, sizeof(*salvo_phy), GFP_KERNEL);
> @@ -326,6 +344,16 @@ static int cdns_salvo_phy_probe(struct platform_device *pdev)
> if (IS_ERR(salvo_phy->clk))
> return PTR_ERR(salvo_phy->clk);
>
> + if (of_property_read_u32(dev->of_node, "usb2-disconnect-threshold-microvolt", &val))
> + val = 575;
> +
> + if (val < 610)
> + salvo_phy->usb2_disconn = USB2_DISCONN_THRESHOLD_575;
> + else if (val < 645)
> + salvo_phy->usb2_disconn = USB2_DISCONN_THRESHOLD_610;
> + else
> + salvo_phy->usb2_disconn = USB2_DISCONN_THRESHOLD_645;
> +
> salvo_phy->base = devm_platform_ioremap_resource(pdev, 0);
> if (IS_ERR(salvo_phy->base))
> return PTR_ERR(salvo_phy->base);
> --
> 2.34.1
--
~Vinod
