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Date: Thu, 8 Dec 2016 15:05:43 +0800
From: Baolin Wang <baolin.wang@...aro.org>
To: mathias.nyman@...el.com, Felipe Balbi <balbi@...nel.org>
Cc: Greg KH <gregkh@...uxfoundation.org>,
Mark Brown <broonie@...nel.org>,
USB <linux-usb@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>,
Baolin Wang <baolin.wang@...aro.org>
Subject: Re: [PATCH v4 2/2] usb: dwc3: core: Support the dwc3 host suspend/resume
Hi Felipe,
On 28 November 2016 at 14:43, Baolin Wang <baolin.wang@...aro.org> wrote:
> For some mobile devices with strict power management, we also want to suspend
> the host when the slave is detached for power saving. Thus we add the host
> suspend/resume functions to support this requirement.
>
> Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
> ---
> Changes since v3:
> - No updates.
>
> Changes since v2:
> - Remove pm_children_suspended() and other unused macros.
>
> Changes since v1:
> - Add pm_runtime.h head file to avoid kbuild error.
> ---
> drivers/usb/dwc3/Kconfig | 7 +++++++
> drivers/usb/dwc3/core.c | 26 +++++++++++++++++++++++++-
> drivers/usb/dwc3/core.h | 15 +++++++++++++++
> drivers/usb/dwc3/host.c | 37 +++++++++++++++++++++++++++++++++++++
> 4 files changed, 84 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/usb/dwc3/Kconfig b/drivers/usb/dwc3/Kconfig
> index a45b4f1..47bb2f3 100644
> --- a/drivers/usb/dwc3/Kconfig
> +++ b/drivers/usb/dwc3/Kconfig
> @@ -47,6 +47,13 @@ config USB_DWC3_DUAL_ROLE
>
> endchoice
>
> +config USB_DWC3_HOST_SUSPEND
> + bool "Choose if the DWC3 host (xhci) can be suspend/resume"
> + depends on USB_DWC3_HOST=y || USB_DWC3_DUAL_ROLE=y
> + help
> + We can suspend the host when the slave is detached for power saving,
> + and resume the host when one slave is attached.
> +
> comment "Platform Glue Driver Support"
>
> config USB_DWC3_OMAP
> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> index 9a4a5e4..7ad4bc3 100644
> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -1091,6 +1091,7 @@ static int dwc3_probe(struct platform_device *pdev)
> pm_runtime_use_autosuspend(dev);
> pm_runtime_set_autosuspend_delay(dev, DWC3_DEFAULT_AUTOSUSPEND_DELAY);
> pm_runtime_enable(dev);
> + pm_suspend_ignore_children(dev, true);
> ret = pm_runtime_get_sync(dev);
> if (ret < 0)
> goto err1;
> @@ -1215,15 +1216,27 @@ static int dwc3_remove(struct platform_device *pdev)
> static int dwc3_suspend_common(struct dwc3 *dwc)
> {
> unsigned long flags;
> + int ret;
>
> switch (dwc->dr_mode) {
> case USB_DR_MODE_PERIPHERAL:
> + spin_lock_irqsave(&dwc->lock, flags);
> + dwc3_gadget_suspend(dwc);
> + spin_unlock_irqrestore(&dwc->lock, flags);
> + break;
> case USB_DR_MODE_OTG:
> + ret = dwc3_host_suspend(dwc);
> + if (ret)
> + return ret;
> +
> spin_lock_irqsave(&dwc->lock, flags);
> dwc3_gadget_suspend(dwc);
> spin_unlock_irqrestore(&dwc->lock, flags);
> break;
> case USB_DR_MODE_HOST:
> + ret = dwc3_host_suspend(dwc);
> + if (ret)
> + return ret;
> default:
> /* do nothing */
> break;
> @@ -1245,12 +1258,23 @@ static int dwc3_resume_common(struct dwc3 *dwc)
>
> switch (dwc->dr_mode) {
> case USB_DR_MODE_PERIPHERAL:
> + spin_lock_irqsave(&dwc->lock, flags);
> + dwc3_gadget_resume(dwc);
> + spin_unlock_irqrestore(&dwc->lock, flags);
> + break;
> case USB_DR_MODE_OTG:
> + ret = dwc3_host_resume(dwc);
> + if (ret)
> + return ret;
> +
> spin_lock_irqsave(&dwc->lock, flags);
> dwc3_gadget_resume(dwc);
> spin_unlock_irqrestore(&dwc->lock, flags);
> - /* FALLTHROUGH */
> + break;
> case USB_DR_MODE_HOST:
> + ret = dwc3_host_resume(dwc);
> + if (ret)
> + return ret;
> default:
> /* do nothing */
> break;
> diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
> index b585a30..db41908 100644
> --- a/drivers/usb/dwc3/core.h
> +++ b/drivers/usb/dwc3/core.h
> @@ -1226,4 +1226,19 @@ static inline void dwc3_ulpi_exit(struct dwc3 *dwc)
> { }
> #endif
>
> +#if IS_ENABLED(CONFIG_USB_DWC3_HOST_SUSPEND)
> +int dwc3_host_suspend(struct dwc3 *dwc);
> +int dwc3_host_resume(struct dwc3 *dwc);
> +#else
> +static inline int dwc3_host_suspend(struct dwc3 *dwc)
> +{
> + return 0;
> +}
> +
> +static inline int dwc3_host_resume(struct dwc3 *dwc)
> +{
> + return 0;
> +}
> +#endif
> +
> #endif /* __DRIVERS_USB_DWC3_CORE_H */
> diff --git a/drivers/usb/dwc3/host.c b/drivers/usb/dwc3/host.c
> index ed82464..8e5309d6 100644
> --- a/drivers/usb/dwc3/host.c
> +++ b/drivers/usb/dwc3/host.c
> @@ -16,6 +16,7 @@
> */
>
> #include <linux/platform_device.h>
> +#include <linux/pm_runtime.h>
>
> #include "core.h"
>
> @@ -130,3 +131,39 @@ void dwc3_host_exit(struct dwc3 *dwc)
> dev_name(&dwc->xhci->dev));
> platform_device_unregister(dwc->xhci);
> }
> +
> +#ifdef CONFIG_USB_DWC3_HOST_SUSPEND
> +int dwc3_host_suspend(struct dwc3 *dwc)
> +{
> + struct device *xhci = &dwc->xhci->dev;
> + int ret;
> +
> + /*
> + * Note: if we get the -EBUSY, which means the xHCI children devices are
> + * not in suspend state yet, the glue layer need to wait for a while and
> + * try to suspend xHCI device again.
> + */
> + ret = pm_runtime_put_sync(xhci);
> + if (ret) {
> + dev_err(xhci, "failed to suspend xHCI device\n");
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +int dwc3_host_resume(struct dwc3 *dwc)
> +{
> + struct device *xhci = &dwc->xhci->dev;
> + int ret;
> +
> + /* Resume the xHCI device synchronously. */
> + ret = pm_runtime_get_sync(xhci);
> + if (ret) {
> + dev_err(xhci, "failed to resume xHCI device\n");
> + return ret;
> + }
> +
> + return 0;
> +}
> +#endif
> --
> 1.7.9.5
>
How do you think this patch and do you have any suggestion? Thanks.
--
Baolin.wang
Best Regards
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