Re: [PATCH/RFC 2/2] usb: host: ehci-platform: fix usb 1.1 device is not connected in system resume

[Peter Chen <hzpeterchen-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

On Mon, Feb 20, 2017 at 04:35:11PM +0900, Yoshihiro Shimoda wrote:
> This patch fixes an issue that a usb 1.1 device is not connected in
> system resume and then the following message appeared if debug messages
> are enabled:
> 	usb 2-1: Waited 2000ms for CONNECT
> 
> To resolve this issue, the EHCI controller must be resumed after its
> companion controllers. So, this patch adds such code on the driver.
> 
> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh-zM6kxYcvzFBBDgjK7y7TUQ@public.gmane.org>
> ---
>  drivers/usb/host/ehci-platform.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/drivers/usb/host/ehci-platform.c b/drivers/usb/host/ehci-platform.c
> index a268d9e..65a7725 100644
> --- a/drivers/usb/host/ehci-platform.c
> +++ b/drivers/usb/host/ehci-platform.c
> @@ -34,6 +34,7 @@
>  #include <linux/usb.h>
>  #include <linux/usb/hcd.h>
>  #include <linux/usb/ehci_pdriver.h>
> +#include <linux/usb/of.h>
>  
>  #include "ehci.h"
>  
> @@ -297,6 +298,8 @@ static int ehci_platform_probe(struct platform_device *dev)
>  		goto err_power;
>  
>  	device_wakeup_enable(hcd->self.controller);
> +	if (usb_of_has_companion(hcd->self.controller))

According to Alan's comments, all USB ehci platform device can be async
device, so this API can be skipped.

> +		device_enable_async_suspend(hcd->self.controller);
>  	platform_set_drvdata(dev, hcd);
>  
>  	return err;
> @@ -370,6 +373,7 @@ static int ehci_platform_resume(struct device *dev)
>  	struct usb_ehci_pdata *pdata = dev_get_platdata(dev);
>  	struct platform_device *pdev = to_platform_device(dev);
>  	struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
> +	struct device *companion_dev;
>  
>  	if (pdata->power_on) {
>  		int err = pdata->power_on(pdev);
> @@ -377,6 +381,10 @@ static int ehci_platform_resume(struct device *dev)
>  			return err;
>  	}
>  
> +	companion_dev = usb_of_get_companion_dev(hcd->self.controller);

Maybe other EHCI controller has companion controller too, so it is ok
for you to let it as a common API.

> +	if (companion_dev)
> +		device_pm_wait_for_dev(hcd->self.controller, companion_dev);
> +
>  	ehci_resume(hcd, priv->reset_on_resume);
>  	return 0;
>  }

You can send formal patch next time.

-- 

Best Regards,
Peter Chen
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