On Mon, 22 Aug 2016, Wenyou Yang wrote:
> The usb controller does not manage correctly the suspend mode for
> the ehci. In echi mode, there is no way to suspend without any
> device connected to it. This is why this specific control is added
> to fix this issue. Since the suspend mode works in ohci mode, this
> specific control works by suspend the usb controller in ohci mode.
>
> This specific control is by setting the SUSPEND_A/B/C fields of
> SFR_OHCIICR(OHCI Interrupt Configuration Register) in the SFR
> while the OHCI USB suspend.
>
> This set operation must be done before the USB clock disabled,
> clear operation after the USB clock enabled.
>
> Signed-off-by: Wenyou Yang <wenyou.yang@xxxxxxxxx>
> Reviewed-by: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxxxxxxxxx>
> Acked-by: Nicolas Ferre <nicolas.ferre@xxxxxxxxx>
> ---
This is getting better...
> @@ -282,6 +301,28 @@ static int ohci_at91_hub_status_data(struct usb_hcd *hcd, char *buf)
> return length;
> }
>
> +static int ohci_at91_port_ctrl(struct regmap *regmap, u8 set)
How about calling this routine ohci_at91_port_suspend instead of
_port_control? After all, the only port feature that it affects is
the suspend feature.
> +{
> + u32 regval;
> + int ret;
> +
> + if (!regmap)
> + return 0;
> +
> + ret = regmap_read(regmap, AT91_SFR_OHCIICR, ®val);
> + if (ret)
> + return ret;
> +
> + if (set)
> + regval |= AT91_OHCIICR_USB_SUSPEND;
> + else
> + regval &= ~AT91_OHCIICR_USB_SUSPEND;
> +
> + regmap_write(regmap, AT91_SFR_OHCIICR, regval);
> +
> + return 0;
> +}
> +
> /*
> * Look at the control requests to the root hub and see if we need to override.
> */
> @@ -289,6 +330,7 @@ static int ohci_at91_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
> u16 wIndex, char *buf, u16 wLength)
> {
> struct at91_usbh_data *pdata = dev_get_platdata(hcd->self.controller);
> + struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd);
> struct usb_hub_descriptor *desc;
> int ret = -EINVAL;
> u32 *data = (u32 *)buf;
> @@ -301,7 +343,8 @@ static int ohci_at91_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
>
> switch (typeReq) {
> case SetPortFeature:
> - if (wValue == USB_PORT_FEAT_POWER) {
> + switch (wValue) {
> + case USB_PORT_FEAT_POWER:
> dev_dbg(hcd->self.controller, "SetPortFeat: POWER\n");
> if (valid_port(wIndex)) {
> ohci_at91_usb_set_power(pdata, wIndex, 1);
> @@ -309,6 +352,11 @@ static int ohci_at91_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
> }
>
> goto out;
> +
> + case USB_PORT_FEAT_SUSPEND:
> + dev_dbg(hcd->self.controller, "SetPortFeat: SUSPEND\n");
Don't you want to check valid_port(wIndex) here, like the
USB_PORT_FEAT_POWER case above?
> + ohci_at91_port_ctrl(ohci_at91->sfr_regmap, 1);
> + break;
> }
> break;
>
> @@ -342,6 +390,12 @@ static int ohci_at91_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
> ohci_at91_usb_set_power(pdata, wIndex, 0);
> return 0;
> }
> + break;
> +
> + case USB_PORT_FEAT_SUSPEND:
> + dev_dbg(hcd->self.controller, "ClearPortFeature: SUSPEND\n");
And here too?
> + ohci_at91_port_ctrl(ohci_at91->sfr_regmap, 0);
> + break;
> }
> break;
> }
> @@ -599,6 +653,9 @@ ohci_hcd_at91_drv_suspend(struct device *dev)
> if (ohci_at91->wakeup)
> enable_irq_wake(hcd->irq);
>
> + ohci_at91_hub_control(hcd, SetPortFeature,
> + USB_PORT_FEAT_SUSPEND, 1, NULL, 0);
> +
You really shouldn't call ohci_at91_hub_control here. Instead, you
can call ohci_at91_port_ctrl (or ohci_at91_port_suspend, if you
change the function's name).
> ret = ohci_suspend(hcd, ohci_at91->wakeup);
> if (ret) {
> if (ohci_at91->wakeup)
> @@ -638,6 +695,10 @@ ohci_hcd_at91_drv_resume(struct device *dev)
> at91_start_clock(ohci_at91);
>
> ohci_resume(hcd, false);
> +
> + ohci_at91_hub_control(hcd, ClearPortFeature,
> + USB_PORT_FEAT_SUSPEND, 1, NULL, 0);
Same here.
> +
> return 0;
> }
Alan Stern
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