On Tue, 22 Oct 2013, Peter Chen wrote:
> When the port goes to suspend or finishes resme, it needs to
> notify PHY, it is not a standard EHCI operation, so we add a
> quirk for it.
Actually, this _should_ be a standard EHCI operation. But we have to
figure out a way to do it that will work on all platforms.
Felipe, any ideas?
Alan Stern
>
> Signed-off-by: Peter Chen <peter.c...@freescale.com>
> ---
> drivers/usb/chipidea/host.c | 129
> ++++++++++++++++++++++++++++++++++++++++++
> include/linux/usb/chipidea.h | 1 +
> 2 files changed, 130 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/usb/chipidea/host.c b/drivers/usb/chipidea/host.c
> index 283b385..c1d05c4 100644
> --- a/drivers/usb/chipidea/host.c
> +++ b/drivers/usb/chipidea/host.c
> @@ -34,6 +34,10 @@
>
> static struct hc_driver __read_mostly ci_ehci_hc_driver;
> static int (*orig_bus_suspend)(struct usb_hcd *hcd);
> +static int (*orig_bus_resume)(struct usb_hcd *hcd);
> +static int (*orig_hub_control)(struct usb_hcd *hcd,
> + u16 typeReq, u16 wValue, u16 wIndex,
> + char *buf, u16 wLength);
>
> static int ci_ehci_bus_suspend(struct usb_hcd *hcd)
> {
> @@ -75,12 +79,131 @@ static int ci_ehci_bus_suspend(struct usb_hcd *hcd)
> */
> udelay(125);
> }
> + if (hcd->phy && test_bit(port, &ehci->bus_suspended)
> + && (ehci_port_speed(ehci, portsc) ==
> + USB_PORT_STAT_HIGH_SPEED))
> + /*
> + * notify the USB PHY, it is for global
> + * suspend case.
> + */
> + usb_phy_notify_suspend(hcd->phy,
> + USB_SPEED_HIGH);
> }
> }
>
> return 0;
> }
>
> +static int ci_imx_ehci_bus_resume(struct usb_hcd *hcd)
> +{
> + struct ehci_hcd *ehci = hcd_to_ehci(hcd);
> + int port;
> +
> + int ret = orig_bus_resume(hcd);
> +
> + if (ret)
> + return ret;
> +
> + port = HCS_N_PORTS(ehci->hcs_params);
> + while (port--) {
> + u32 __iomem *reg = &ehci->regs->port_status[port];
> + u32 portsc = ehci_readl(ehci, reg);
> + /*
> + * Notify PHY after resume signal has finished, it is
> + * for global suspend case.
> + */
> + if (hcd->phy
> + && test_bit(port, &ehci->bus_suspended)
> + && (portsc & PORT_CONNECT)
> + && (ehci_port_speed(ehci, portsc) ==
> + USB_PORT_STAT_HIGH_SPEED))
> + /* notify the USB PHY */
> + usb_phy_notify_resume(hcd->phy, USB_SPEED_HIGH);
> + }
> +
> + return 0;
> +}
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