linux-kernel - Re: [PATCH 3/8][v3]usb:fsl:otg: Add support to add/remove usb host driver

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Date:	Thu, 13 Aug 2015 14:47:28 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Ramneek Mehresh <ramneek.mehresh@...escale.com>
cc:	linux-kernel@...r.kernel.org, <balbi@...com>,
	<gregkh@...uxfoundation.org>, <linux-usb@...r.kernel.org>,
	Li Yang <leoli@...escale.com>
Subject: Re: [PATCH 3/8][v3]usb:fsl:otg: Add support to add/remove usb host
 driver

On Thu, 13 Aug 2015, Ramneek Mehresh wrote:

> Add workqueue to add/remove host driver (outside
> interrupt context) upon each id change.
> 
> Signed-off-by: Li Yang <leoli@...escale.com>
> Signed-off-by: Ramneek Mehresh <ramneek.mehresh@...escale.com>
> ---
> Changes for v3:
>         - removed CONFIG_FSL_USB2_OTG and CONFIG_FSL_USB2_OTG_MODULE
>           macros
>         - removed call to usb_hcd_resume_root_hub(hcd) from
>           ehci_fsl_drv_resume()
> 
>  drivers/usb/host/ehci-fsl.c | 71 ++++++++++++++++++++++++++++++++-------------
>  drivers/usb/host/ehci-fsl.h | 18 ++++++++++++
>  2 files changed, 69 insertions(+), 20 deletions(-)


>  static int ehci_fsl_drv_suspend(struct device *dev)
>  {
>  	struct usb_hcd *hcd = dev_get_drvdata(dev);
> -	struct ehci_fsl *ehci_fsl = hcd_to_ehci_fsl(hcd);
>  	void __iomem *non_ehci = hcd->regs;
> +	struct ehci_fsl *ehci_fsl = hcd_to_ehci_fsl(hcd);
> +	struct usb_bus host = hcd->self;

I just noticed this line.  It does not look right at all; it does a 
structure copy instead of copying a pointer.

>  
>  	if (of_device_is_compatible(dev->parent->of_node,
>  				    "fsl,mpc5121-usb2-dr")) {
>  		return ehci_fsl_mpc512x_drv_suspend(dev);
>  	}
>  
> +	if (host.is_otg) {
> +		/* remove hcd */
> +		ehci_fsl->hcd_add = 0;
> +		schedule_work(&ehci_fsl->change_hcd_work);
> +		host.is_otg = 0;

And here you turn off the flag in the local copy of the structure, 
which accomplishes nothing.

> +		return 0;
> +	}
> +
>  	ehci_prepare_ports_for_controller_suspend(hcd_to_ehci(hcd),
>  			device_may_wakeup(dev));
>  	if (!fsl_deep_sleep())
> @@ -557,15 +579,24 @@ static int ehci_fsl_drv_suspend(struct device *dev)
>  static int ehci_fsl_drv_resume(struct device *dev)
>  {
>  	struct usb_hcd *hcd = dev_get_drvdata(dev);
> -	struct ehci_fsl *ehci_fsl = hcd_to_ehci_fsl(hcd);
>  	struct ehci_hcd *ehci = hcd_to_ehci(hcd);
>  	void __iomem *non_ehci = hcd->regs;
> +	struct ehci_fsl *ehci_fsl = hcd_to_ehci_fsl(hcd);
> +	struct usb_bus host = hcd->self;

Same here.

> --- a/drivers/usb/host/ehci-fsl.h
> +++ b/drivers/usb/host/ehci-fsl.h
> @@ -63,4 +63,22 @@
>  #define UTMI_PHY_EN             (1<<9)
>  #define ULPI_PHY_CLK_SEL        (1<<10)
>  #define PHY_CLK_VALID		(1<<17)
> +
> +struct ehci_fsl {
> +#ifdef CONFIG_PM
> +	/* Saved USB PHY settings, need to restore after deep sleep. */
> +	u32 usb_ctrl;
> +#endif

Do you need this #ifdef?

Alan Stern

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