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SubjectRe: [PATCH v3 6/6] usb: chipidea: add work-around for Marvell HSIC PHY startup
On Fri, May 29, 2015 at 11:38:46AM -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 and has been tested on i.MX6S.

tested on i.mx6sx

>
> Signed-off-by: Rob Herring <robh@kernel.org>
> Tested-by: Peter Chen <Peter.Chen@freescale.com>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: linux-usb@vger.kernel.org
> ---
> 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;

Forgot to comment last time, the ci is the private driver_data for
ci->dev, so you can get ci by calling dev_get_drvdata(dev), no need
to add an entry at struct ehci_ci_priv.

> 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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