linux-kernel - Re: [PATCH v4 4/5] usb: host: add some to xhci overrides for xhci-exynos

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Date:   Tue, 26 Apr 2022 12:23:30 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Daehwan Jung <dh10.jung@...sung.com>
Cc:     Mathias Nyman <mathias.nyman@...el.com>,
        "open list:USB XHCI DRIVER" <linux-usb@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Howard Yen <howardyen@...gle.com>,
        Jack Pham <jackp@...eaurora.org>,
        Puma Hsu <pumahsu@...gle.com>,
        "J . Avila" <elavila@...gle.com>, sc.suh@...sung.com,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
Subject: Re: [PATCH v4 4/5] usb: host: add some to xhci overrides for
 xhci-exynos

On Tue, Apr 26, 2022 at 06:18:47PM +0900, Daehwan Jung wrote:
> Co-processor needs some information about connected usb device.
> It's proper to pass information after usb device gets address when
> getting "Set Address" command. It supports vendors to implement it
> using xhci overrides. There're several power scenarios depending
> on vendors. It gives vendors flexibilty to meet their power requirement.
> They can override suspend and resume of root hub.
> 
> Signed-off-by: Daehwan Jung <dh10.jung@...sung.com>
> ---
>  drivers/usb/host/xhci.c | 6 ++++++
>  drivers/usb/host/xhci.h | 4 ++++
>  2 files changed, 10 insertions(+)
> 
> diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
> index 5ccf1bbe8732..8b3df1302650 100644
> --- a/drivers/usb/host/xhci.c
> +++ b/drivers/usb/host/xhci.c
> @@ -5555,6 +5555,12 @@ void xhci_init_driver(struct hc_driver *drv,
>  			drv->check_bandwidth = over->check_bandwidth;
>  		if (over->reset_bandwidth)
>  			drv->reset_bandwidth = over->reset_bandwidth;
> +		if (over->address_device)
> +			drv->address_device = over->address_device;
> +		if (over->bus_suspend)
> +			drv->bus_suspend = over->bus_suspend;
> +		if (over->bus_resume)
> +			drv->bus_resume = over->bus_resume;
>  	}
>  }
>  EXPORT_SYMBOL_GPL(xhci_init_driver);
> diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
> index 3a414a2f41f0..5bc621e77762 100644
> --- a/drivers/usb/host/xhci.h
> +++ b/drivers/usb/host/xhci.h
> @@ -1947,6 +1947,9 @@ struct xhci_driver_overrides {
>  			     struct usb_host_endpoint *ep);
>  	int (*check_bandwidth)(struct usb_hcd *, struct usb_device *);
>  	void (*reset_bandwidth)(struct usb_hcd *, struct usb_device *);
> +	int (*address_device)(struct usb_hcd *hcd, struct usb_device *udev);
> +	int (*bus_suspend)(struct usb_hcd *hcd);
> +	int (*bus_resume)(struct usb_hcd *hcd);
>  };
>  
>  #define	XHCI_CFC_DELAY		10
> @@ -2103,6 +2106,7 @@ int xhci_drop_endpoint(struct usb_hcd *hcd, struct usb_device *udev,
>  		       struct usb_host_endpoint *ep);
>  int xhci_check_bandwidth(struct usb_hcd *hcd, struct usb_device *udev);
>  void xhci_reset_bandwidth(struct usb_hcd *hcd, struct usb_device *udev);
> +int xhci_address_device(struct usb_hcd *hcd, struct usb_device *udev);

You do not use this function in this change, why include it in here?

Please reorganize your patch series to only include what you need for
each step, as-is it's kind of out-of-order and might not build at each
step along the way (or it might, it's hard to determine...)

thanks,

greg k-h