Hi Kever,
2014-10-31 15:02 GMT+01:00 Kever Yang <kever.yang@xxxxxxxxxxxxxx>:
> This patch adds suspend/resume for dwc2 hcd controller.
>
Could you add a more explicit and detailed message ? It is redundant
with the commit subject and explains almost the same thing.
> Signed-off-by: Kever Yang <kever.yang@xxxxxxxxxxxxxx>
> ---
>
> drivers/usb/dwc2/hcd.c | 74 ++++++++++++++++++++++++++++++++++++++++++--------
> 1 file changed, 63 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
> index fa49c72..df68449 100644
> --- a/drivers/usb/dwc2/hcd.c
> +++ b/drivers/usb/dwc2/hcd.c
> @@ -1473,6 +1473,29 @@ static void dwc2_port_suspend(struct dwc2_hsotg *hsotg, u16 windex)
> }
> }
>
> +static void dwc2_port_resume(struct dwc2_hsotg *hsotg)
> +{
> + u32 hprt0;
> +
> + /* After clear the Stop PHY clock bit, we should wait for a moment
> + * for PLL work stable with clock output.
> + */
> + writel(0, hsotg->regs + PCGCTL);
> + usleep_range(2000, 4000);
> +
> + hprt0 = dwc2_read_hprt0(hsotg);
> + hprt0 |= HPRT0_RES;
> + writel(hprt0, hsotg->regs + HPRT0);
> + hprt0 &= ~HPRT0_SUSP;
> + /* according to USB2.0 Spec 7.1.7.7, the host most send the resume
> + * signal for at least 20ms
> + */
Typo here, most => must .
> + usleep_range(20000, 25000);
> +
> + hprt0 &= ~HPRT0_RES;
> + writel(hprt0, hsotg->regs + HPRT0);
> +}
> +
> /* Handles hub class-specific requests */
> static int dwc2_hcd_hub_control(struct dwc2_hsotg *hsotg, u16 typereq,
> u16 wvalue, u16 windex, char *buf, u16 wlength)
> @@ -1518,17 +1541,7 @@ static int dwc2_hcd_hub_control(struct dwc2_hsotg *hsotg, u16 typereq,
> case USB_PORT_FEAT_SUSPEND:
> dev_dbg(hsotg->dev,
> "ClearPortFeature USB_PORT_FEAT_SUSPEND\n");
> - writel(0, hsotg->regs + PCGCTL);
> - usleep_range(20000, 40000);
> -
> - hprt0 = dwc2_read_hprt0(hsotg);
> - hprt0 |= HPRT0_RES;
> - writel(hprt0, hsotg->regs + HPRT0);
> - hprt0 &= ~HPRT0_SUSP;
> - usleep_range(100000, 150000);
> -
> - hprt0 &= ~HPRT0_RES;
> - writel(hprt0, hsotg->regs + HPRT0);
> + dwc2_port_resume(hsotg);
> break;
>
> case USB_PORT_FEAT_POWER:
> @@ -2301,6 +2314,42 @@ static void _dwc2_hcd_stop(struct usb_hcd *hcd)
> usleep_range(1000, 3000);
> }
>
> +static int _dwc2_hcd_suspend(struct usb_hcd *hcd)
> +{
> + struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
> + u32 hprt0;
> +
> + if (hsotg->op_state != OTG_STATE_B_HOST)
> + return 0;
> +
> + if (hsotg->lx_state != DWC2_L0)
> + return 0;
> +
> + hprt0 = dwc2_read_hprt0(hsotg);
> + if (hprt0 & HPRT0_CONNSTS)
> + dwc2_port_suspend(hsotg, 1);
> +
> + return 0;
> +}
> +
> +static int _dwc2_hcd_resume(struct usb_hcd *hcd)
> +{
> + struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
> + u32 hprt0;
> +
> + if (hsotg->op_state != OTG_STATE_B_HOST)
> + return 0;
> +
> + if (hsotg->lx_state != DWC2_L2)
> + return 0;
> +
> + hprt0 = dwc2_read_hprt0(hsotg);
> + if ((hprt0 | HPRT0_CONNSTS) && (hprt0 | HPRT0_SUSP))
> + dwc2_port_resume(hsotg);
> +
> + return 0;
> +}
> +
> /* Returns the current frame number */
> static int _dwc2_hcd_get_frame_number(struct usb_hcd *hcd)
> {
> @@ -2671,6 +2720,9 @@ static struct hc_driver dwc2_hc_driver = {
> .hub_status_data = _dwc2_hcd_hub_status_data,
> .hub_control = _dwc2_hcd_hub_control,
> .clear_tt_buffer_complete = _dwc2_hcd_clear_tt_buffer_complete,
> +
> + .bus_suspend = _dwc2_hcd_suspend,
> + .bus_resume = _dwc2_hcd_resume,
These functions should be defined and registered conditionnally under
#ifdef CONFIG_PM.
Romain
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