On 4/8/2021 1:45 PM, Artur Petrosyan wrote:
> Added flow of exiting Partial Power Down in
> "dwc2_port_resume()" function when core receives resume.
>
> NOTE: Switch case statement is used for hibernation partial
> power down and clock gating mode determination. In this patch
> only Partial Power Down is implemented the Hibernation and
> clock gating implementations are planned to be added.
>
> Signed-off-by: Artur Petrosyan <arthur.petros...@synopsys.com>
Acked-by: Minas Harutyunyan <minas.harutyun...@synopsys.com>
> ---
> Changes in v3:
> - None
> Changes in v2:
> - None
>
> drivers/usb/dwc2/core.h | 5 ++--
> drivers/usb/dwc2/hcd.c | 61 ++++++++++++++++++++++++++---------------
> 2 files changed, 42 insertions(+), 24 deletions(-)
>
> diff --git a/drivers/usb/dwc2/core.h b/drivers/usb/dwc2/core.h
> index 76807abd753b..5a7850482e57 100644
> --- a/drivers/usb/dwc2/core.h
> +++ b/drivers/usb/dwc2/core.h
> @@ -1471,7 +1471,7 @@ void dwc2_hcd_disconnect(struct dwc2_hsotg *hsotg, bool
> force);
> void dwc2_hcd_start(struct dwc2_hsotg *hsotg);
> int dwc2_core_init(struct dwc2_hsotg *hsotg, bool initial_setup);
> int dwc2_port_suspend(struct dwc2_hsotg *hsotg, u16 windex);
> -void dwc2_port_resume(struct dwc2_hsotg *hsotg);
> +int dwc2_port_resume(struct dwc2_hsotg *hsotg);
> int dwc2_backup_host_registers(struct dwc2_hsotg *hsotg);
> int dwc2_restore_host_registers(struct dwc2_hsotg *hsotg);
> int dwc2_host_enter_hibernation(struct dwc2_hsotg *hsotg);
> @@ -1497,7 +1497,8 @@ static inline int dwc2_core_init(struct dwc2_hsotg
> *hsotg, bool initial_setup)
> { return 0; }
> static inline int dwc2_port_suspend(struct dwc2_hsotg *hsotg, u16 windex)
> { return 0; }
> -static inline void dwc2_port_resume(struct dwc2_hsotg *hsotg) {}
> +static inline int dwc2_port_resume(struct dwc2_hsotg *hsotg)
> +{ return 0; }
> static inline int dwc2_hcd_init(struct dwc2_hsotg *hsotg)
> { return 0; }
> static inline int dwc2_backup_host_registers(struct dwc2_hsotg *hsotg)
> diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
> index e7fb0d5940bc..720354df014b 100644
> --- a/drivers/usb/dwc2/hcd.c
> +++ b/drivers/usb/dwc2/hcd.c
> @@ -3353,44 +3353,61 @@ int dwc2_port_suspend(struct dwc2_hsotg *hsotg, u16
> windex)
> *
> * @hsotg: Programming view of the DWC_otg controller
> *
> + * Return: non-zero if failed to exit suspend mode for host.
> + *
> * This function is for exiting Host mode suspend.
> * Must NOT be called with interrupt disabled or spinlock held.
> */
> -void dwc2_port_resume(struct dwc2_hsotg *hsotg)
> +int dwc2_port_resume(struct dwc2_hsotg *hsotg)
> {
> unsigned long flags;
> u32 hprt0;
> u32 pcgctl;
> + int ret = 0;
>
> spin_lock_irqsave(&hsotg->lock, flags);
>
> - /*
> - * If power_down is supported, Phy clock is already resumed
> - * after registers restore.
> - */
> - if (!hsotg->params.power_down) {
> - pcgctl = dwc2_readl(hsotg, PCGCTL);
> - pcgctl &= ~PCGCTL_STOPPCLK;
> - dwc2_writel(hsotg, pcgctl, PCGCTL);
> + switch (hsotg->params.power_down) {
> + case DWC2_POWER_DOWN_PARAM_PARTIAL:
> + ret = dwc2_exit_partial_power_down(hsotg, 0, true);
> + if (ret)
> + dev_err(hsotg->dev,
> + "exit partial_power_down failed.\n");
> + break;
> + case DWC2_POWER_DOWN_PARAM_HIBERNATION:
> + case DWC2_POWER_DOWN_PARAM_NONE:
> + default:
> + /*
> + * If power_down is supported, Phy clock is already resumed
> + * after registers restore.
> + */
> + if (!hsotg->params.power_down) {
> + pcgctl = dwc2_readl(hsotg, PCGCTL);
> + pcgctl &= ~PCGCTL_STOPPCLK;
> + dwc2_writel(hsotg, pcgctl, PCGCTL);
> + spin_unlock_irqrestore(&hsotg->lock, flags);
> + msleep(20);
> + spin_lock_irqsave(&hsotg->lock, flags);
> + }
> +
> + hprt0 = dwc2_read_hprt0(hsotg);
> + hprt0 |= HPRT0_RES;
> + hprt0 &= ~HPRT0_SUSP;
> + dwc2_writel(hsotg, hprt0, HPRT0);
> spin_unlock_irqrestore(&hsotg->lock, flags);
> - msleep(20);
> +
> + msleep(USB_RESUME_TIMEOUT);
> +
> spin_lock_irqsave(&hsotg->lock, flags);
> + hprt0 = dwc2_read_hprt0(hsotg);
> + hprt0 &= ~(HPRT0_RES | HPRT0_SUSP);
> + dwc2_writel(hsotg, hprt0, HPRT0);
> + hsotg->bus_suspended = false;
> }
>
> - hprt0 = dwc2_read_hprt0(hsotg);
> - hprt0 |= HPRT0_RES;
> - hprt0 &= ~HPRT0_SUSP;
> - dwc2_writel(hsotg, hprt0, HPRT0);
> spin_unlock_irqrestore(&hsotg->lock, flags);
>
> - msleep(USB_RESUME_TIMEOUT);
> -
> - spin_lock_irqsave(&hsotg->lock, flags);
> - hprt0 = dwc2_read_hprt0(hsotg);
> - hprt0 &= ~(HPRT0_RES | HPRT0_SUSP);
> - dwc2_writel(hsotg, hprt0, HPRT0);
> - hsotg->bus_suspended = false;
> - spin_unlock_irqrestore(&hsotg->lock, flags);
> + return ret;
> }
>
> /* Handles hub class-specific requests */
>
