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Message-ID: <CAMz4kuJ26hXL_KD+TVYRziOCNx=xrUjLSc4eW2Z-6x1FMzmFnQ@mail.gmail.com>
Date: Mon, 16 Jan 2017 18:53:28 +0800
From: Baolin Wang <baolin.wang@...aro.org>
To: Felipe Balbi <balbi@...nel.org>
Cc: Mathias Nyman <mathias.nyman@...el.com>,
Greg KH <gregkh@...uxfoundation.org>,
Mark Brown <broonie@...nel.org>,
USB <linux-usb@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 2/2] usb: dwc3: core: Support the dwc3 host suspend/resume
Hi,
On 16 January 2017 at 18:28, Felipe Balbi <balbi@...nel.org> wrote:
>
> Hi,
>
> Baolin Wang <baolin.wang@...aro.org> writes:
>> 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 v4:
>> - Remove Kconfig and just enable host suspend/resume.
>> - Simplify the dwc3_host_suspend/resume() function.
>>
>> 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/core.c | 26 +++++++++++++++++++++++++-
>> drivers/usb/dwc3/core.h | 7 +++++++
>> drivers/usb/dwc3/host.c | 21 +++++++++++++++++++++
>> 3 files changed, 53 insertions(+), 1 deletion(-)
>>
>> 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..1099168 100644
>> --- a/drivers/usb/dwc3/core.h
>> +++ b/drivers/usb/dwc3/core.h
>> @@ -1158,11 +1158,18 @@ static inline bool dwc3_is_usb31(struct dwc3 *dwc)
>> #if IS_ENABLED(CONFIG_USB_DWC3_HOST) || IS_ENABLED(CONFIG_USB_DWC3_DUAL_ROLE)
>> int dwc3_host_init(struct dwc3 *dwc);
>> void dwc3_host_exit(struct dwc3 *dwc);
>> +int dwc3_host_suspend(struct dwc3 *dwc);
>> +int dwc3_host_resume(struct dwc3 *dwc);
>> #else
>> static inline int dwc3_host_init(struct dwc3 *dwc)
>> { return 0; }
>> static inline void dwc3_host_exit(struct dwc3 *dwc)
>> { }
>> +
>> +static inline int dwc3_host_suspend(struct dwc3 *dwc)
>> +{ return 0; }
>> +static inline int dwc3_host_resume(struct dwc3 *dwc)
>> +{ return 0; }
>> #endif
>>
>> #if IS_ENABLED(CONFIG_USB_DWC3_GADGET) || IS_ENABLED(CONFIG_USB_DWC3_DUAL_ROLE)
>> diff --git a/drivers/usb/dwc3/host.c b/drivers/usb/dwc3/host.c
>> index ed82464..7959ef0 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 +131,23 @@ void dwc3_host_exit(struct dwc3 *dwc)
>> dev_name(&dwc->xhci->dev));
>> platform_device_unregister(dwc->xhci);
>> }
>> +
>> +int dwc3_host_suspend(struct dwc3 *dwc)
>> +{
>> + struct device *xhci = &dwc->xhci->dev;
>> +
>> + /*
>> + * 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.
>> + */
>> + return pm_runtime_put_sync(xhci);
>> +}
>> +
>> +int dwc3_host_resume(struct dwc3 *dwc)
>> +{
>> + struct device *xhci = &dwc->xhci->dev;
>> +
>> + /* Resume the xHCI device synchronously. */
>> + return pm_runtime_get_sync(xhci);
>> +}
>> --
>> 1.7.9.5
>
> I can't take this without Mathias taking xhci side of things.
Okay, I will wait for Mathias' comments. Thanks.
--
Baolin.wang
Best Regards
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