[PATCH] phy: sun4i-usb: Fix PHY0 routing and passby configuration for MUSB

[Jagan Teki]

On Wed, May 26, 2021 at 6:27 AM Andre Przywara <andre.przywara at arm.com> wrote:
>
> From: Paul Kocialkowski <paul.kocialkowski at bootlin.com>
>
> Recent Allwinner platforms (starting with the H3) only use the MUSB
> controller for peripheral mode and use HCI for host mode. As a result,
> extra steps need to be taken to properly route USB signals to one or
> the other. More precisely, the following is required:
> * Routing the pins to either HCI/MUSB (controlled by PHY);
> * Enabling USB PHY passby in HCI mode (controlled by PMU).
>
> The current code will enable passby for each PHY and reroute PHY0 to
> MUSB, which is inconsistent and results in broken USB host support
> for port 0.
>
> Passby on PHY0 must only be enabled when we want to use HCI. Since
> host/device mode detection is not available from the PHY code and
> because U-Boot does not support changing the mode dynamically anyway,
> we can just mux the controller to MUSB if it is enabled and mux it to
> HCI otherwise.
>
> This fixes USB host support for port 0 on platforms with PHY0 dual-route,
> especially on boards like Pine64 (with only USB-A host ports) and
> TV boxes without OTG ports.
>
> Signed-off-by: Paul Kocialkowski <paul.kocialkowski at bootlin.com>
> [Andre: tweak commit message, use IS_ENABLED()]
> Signed-off-by: Andre Przywara <andre.przywara at arm.com>
> ---
> Hi,
>
> for H6 boards to work this requires a DT update (to get the <&usbphy 0>
> links between HCI and PHY), which I will send later.
> Tested on Pine H64, Pine64-LTS, OrangePi Zero, OrangePi PC 2, BananaPi M64,
> BananaPi M1.
>
> Cheers,
> Andre
>
>  drivers/phy/allwinner/phy-sun4i-usb.c | 16 ++++++++++++++--
>  1 file changed, 14 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/phy/allwinner/phy-sun4i-usb.c b/drivers/phy/allwinner/phy-sun4i-usb.c
> index 5723c980323..e6ceafc7648 100644
> --- a/drivers/phy/allwinner/phy-sun4i-usb.c
> +++ b/drivers/phy/allwinner/phy-sun4i-usb.c
> @@ -313,9 +313,21 @@ static int sun4i_usb_phy_init(struct phy *phy)
>                                     data->cfg->disc_thresh, PHY_DISCON_TH_LEN);
>         }
>
> -       sun4i_usb_phy_passby(phy, true);
> +       if (IS_ENABLED(CONFIG_USB_MUSB_SUNXI)) {

I believe i did comment this before to use driver_data flag as this is
full dm driver instead of macro style.

Jagan.