On Tue, May 19, 2015 at 09:10:05PM -0500, Rob Herring wrote:
> The Marvell 28nm HSIC PHY requires the port to be forced to HS mode after
> the port power is applied. This is done using the test mode in the PORTSC
> register.
>
> As HSIC is always HS, this work-around should be safe to do with all HSIC
> PHYs. If not, a flag can also be added.
I think a flag is needed, not sure all vendors can work well with that.
>
> Signed-off-by: Rob Herring <robh@xxxxxxxxxx>
> Cc: Peter Chen <Peter.Chen@xxxxxxxxxxxxx>
> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> Cc: linux-usb@xxxxxxxxxxxxxxx
> ---
> drivers/usb/chipidea/host.c | 12 ++++++++++++
> 1 file changed, 12 insertions(+)
>
> diff --git a/drivers/usb/chipidea/host.c b/drivers/usb/chipidea/host.c
> index 21fe1a3..6cf87b8 100644
> --- a/drivers/usb/chipidea/host.c
> +++ b/drivers/usb/chipidea/host.c
> @@ -37,12 +37,14 @@ static int (*orig_bus_suspend)(struct usb_hcd *hcd);
>
> struct ehci_ci_priv {
> struct regulator *reg_vbus;
> + struct ci_hdrc *ci;
> };
>
> static int ehci_ci_portpower(struct usb_hcd *hcd, int portnum, bool enable)
> {
> struct ehci_hcd *ehci = hcd_to_ehci(hcd);
> struct ehci_ci_priv *priv = (struct ehci_ci_priv *)ehci->priv;
> + struct ci_hdrc *ci = priv->ci;
> struct device *dev = hcd->self.controller;
> int ret = 0;
> int port = HCS_N_PORTS(ehci->hcs_params);
> @@ -64,6 +66,15 @@ static int ehci_ci_portpower(struct usb_hcd *hcd, int portnum, bool enable)
> return ret;
> }
> }
> +
> + if (enable && (ci->platdata->phy_mode == USBPHY_INTERFACE_MODE_HSIC)) {
> + /*
> + * Marvell 28nm HSIC PHY requires forcing the port to HS mode.
> + * As HSIC is always HS, this should be safe for others.
> + */
> + hw_port_test_set(ci, 5);
> + hw_port_test_set(ci, 0);
> + }
> return 0;
> };
>
> @@ -112,6 +123,7 @@ static int host_start(struct ci_hdrc *ci)
>
> priv = (struct ehci_ci_priv *)ehci->priv;
> priv->reg_vbus = NULL;
> + priv->ci = ci;
>
> if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci)) {
> if (ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON) {
> --
> 2.1.0
>
--
Best Regards,
Peter Chen
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