Re: [PATCH v6 5/6] phy: realtek: usb2: add support for RTL9607C USB2 PHY

On Wed, May 20, 2026 at 10:57:27PM +0500, Rustam Adilov wrote:
> Add support for the usb2 phy of RTL9607C series based SoCs.
> Add the macros and phy config struct for rtl9607.
> 
> RTL9607C requires to clear a "force host disconnect" bit in the
> specific register (which is at an offset from reg_wrap_vstatus)
> before proceeding with phy parameter writes. Since it belongs into
> the vstatus register region, it requires the use of added read and
> write helper functions.
> 
> Add the bool variable to the driver data struct and hide this whole
> procedure under the if statement that checks this new variable.
> 
> Add the appropriate big endian read and write functions for rtl9607
> and assign them to its phy config struct.
> 
> Co-developed-by: Michael Zavertkin <[email protected]>
> Signed-off-by: Michael Zavertkin <[email protected]>
> Signed-off-by: Rustam Adilov <[email protected]>
> ---
>  drivers/phy/realtek/phy-rtk-usb2.c | 58 ++++++++++++++++++++++++++++++
>  1 file changed, 58 insertions(+)
> 
> diff --git a/drivers/phy/realtek/phy-rtk-usb2.c b/drivers/phy/realtek/phy-rtk-usb2.c
> index 16c5fc3191de..69f0f5279b5e 100644
> --- a/drivers/phy/realtek/phy-rtk-usb2.c
> +++ b/drivers/phy/realtek/phy-rtk-usb2.c
> @@ -26,6 +26,12 @@
>  #define PHY_VCTRL_SHIFT 8
>  #define PHY_REG_DATA_MASK 0xff
>  
> +#define PHY_9607_VSTS_BUSY BIT(17)
> +#define PHY_9607_NEW_REG_REQ BIT(13)
> +
> +#define PHY_9607_FORCE_DISCONNECT_REG 0x10
> +#define PHY_9607_FORCE_DISCONNECT_BIT BIT(5)
> +
>  #define GET_LOW_NIBBLE(addr) ((addr) & 0x0f)
>  #define GET_HIGH_NIBBLE(addr) (((addr) & 0xf0) >> 4)
>  
> @@ -109,6 +115,7 @@ struct phy_cfg {
>  
>  	u32 (*read)(void __iomem *reg);
>  	void (*write)(u32 val, void __iomem *reg);
> +	bool force_host_disconnect;
>  };
>  
>  struct phy_parameter {
> @@ -146,6 +153,16 @@ static void rtk_usb2phy_write(u32 val, void __iomem *reg)
>  	writel(val, reg);
>  }
>  
> +static u32 rtk_usb2phy_read_be(void __iomem *reg)
> +{
> +	return ioread32be(reg);
> +}
> +
> +static void rtk_usb2phy_write_be(u32 val, void __iomem *reg)
> +{
> +	iowrite32be(val, reg);
> +}
> +
>  /* mapping 0xE0 to 0 ... 0xE7 to 7, 0xF0 to 8 ,,, 0xF7 to 15 */
>  static inline int page_addr_to_array_index(u8 addr)
>  {
> @@ -600,6 +617,19 @@ static int do_rtk_phy_init(struct rtk_phy *rtk_phy, int index)
>  		goto do_toggle;
>  	}
>  
> +	if (phy_cfg->force_host_disconnect) {
> +		/* disable force-host-disconnect */
> +		void __iomem *vstatus = phy_reg->reg_wrap_vstatus;
> +		u32 temp;
> +
> +		temp = phy_reg->read(vstatus + PHY_9607_FORCE_DISCONNECT_REG);
> +
> +		temp &= ~PHY_9607_FORCE_DISCONNECT_BIT;
> +		phy_reg->write(temp, vstatus + PHY_9607_FORCE_DISCONNECT_REG);
> +
> +		usleep_range(10000, 11000);

If you really want to make sure the delay gets completed within this if()
condition, then add a read.

- Mani

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