[U-Boot] [PATCH 2/2] usb: phy: omap_usb_phy: implement usb_phy_power() for AM437x

[Michael Trimarchi]

Hi

Il 23/giu/2014 23:26 "Felipe Balbi" <balbi at ti.com> ha scritto:
>
> Newer AM437x silicon requires us to explicitly power up
> the USB2 PHY. By implementing usb_phy_power() we can
> achieve that.
>
> Signed-off-by: Felipe Balbi <balbi at ti.com>
> ---
>  drivers/usb/phy/omap_usb_phy.c | 17 ++++++++++++++++-
>  1 file changed, 16 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/usb/phy/omap_usb_phy.c
b/drivers/usb/phy/omap_usb_phy.c
> index af46db2..0ed3e70 100644
> --- a/drivers/usb/phy/omap_usb_phy.c
> +++ b/drivers/usb/phy/omap_usb_phy.c
> @@ -222,7 +222,22 @@ static void am437x_enable_usb2_phy2(struct omap_xhci
*omap)
>
>  void usb_phy_power(int on)
>  {
> -       return;
> +       u32 val;
> +
> +       /* USB1_CTRL */
> +       val = readl(0x44e10628);

Can you please describe 0x44e...

> +       if (on) {
> +               /*
> +                * these bits are re-used on AM437x to power up/down the
USB
> +                * CM and OTG PHYs, if we don't toggle them, USB will not
be
> +                * functional on newer silicon revisions
> +                */
> +               val &= ~0x3;
> +       } else {
> +               val |= 0x3;

ditto

> +       }
> +
> +       writel(val, 0x44e10628);

ditto

>  }
>  #endif /* CONFIG_AM437X_USB2PHY2_HOST */
>

Michael

> --
> 2.0.0.390.gcb682f8
>
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