[RFC/PATCH 2/2] phy: rockchip: usbdp: implement .set_mode

[Heiko Stuebner]

Hi John,

Am Donnerstag, 10. Juli 2025, 17:22:50 Mitteleuropäische Sommerzeit schrieb John Keeping:
> When the orientation of a type C cable changes, usbdp set the new
> configuration in its internal state but does not write this to the
> hardware.
> 
> Make use of phy_ops::set_mode to write this new state.  This should be
> called by the USB controller when it is notified of a role change
> (assuming it is acting as the role switch) and will be called at a point
> when the controller does not expect the phy to be operating normally.
> 
> Signed-off-by: John Keeping <jkeeping at inmusicbrands.com>

with the comments from Ondrej in [0] the whole thing seems to be
slightly more complex


[0] https://patchwork.kernel.org/project/linux-arm-kernel/patch/20250225184519.3586926-3-heiko@sntech.de/

> ---
>  drivers/phy/rockchip/phy-rockchip-usbdp.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/drivers/phy/rockchip/phy-rockchip-usbdp.c b/drivers/phy/rockchip/phy-rockchip-usbdp.c
> index c066cc0a7b4f1..00368fb09307a 100644
> --- a/drivers/phy/rockchip/phy-rockchip-usbdp.c
> +++ b/drivers/phy/rockchip/phy-rockchip-usbdp.c
> @@ -1335,9 +1335,23 @@ static int rk_udphy_usb3_phy_exit(struct phy *phy)
>  	return 0;
>  }
>  
> +static int rk_udphy_usb3_phy_set_mode(struct phy *phy, enum phy_mode mode, int submode)
> +{
> +	struct rk_udphy *udphy = phy_get_drvdata(phy);
> +	int ret = 0;
> +
> +	mutex_lock(&udphy->mutex);
> +	if (udphy->mode != UDPHY_MODE_NONE)
> +		ret = rk_udphy_init(udphy);
> +	mutex_unlock(&udphy->mutex);
> +
> +	return ret;
> +}
> +
>  static const struct phy_ops rk_udphy_usb3_phy_ops = {
>  	.init		= rk_udphy_usb3_phy_init,
>  	.exit		= rk_udphy_usb3_phy_exit,
> +	.set_mode	= rk_udphy_usb3_phy_set_mode,
>  	.owner		= THIS_MODULE,
>  };
>  
>