Re: [PATCH v12 6/9] usb: xhci: use bus->sysdev for DMA configuration

[Peter Chen]

On Thu, Feb 09, 2017 at 05:40:50PM +0530, Vivek Gautam wrote:
> On Thu, Feb 9, 2017 at 5:24 PM, Roger Quadros <rogerq@xxxxxx> wrote:
> >
> >
> > On 09/02/17 13:53, Roger Quadros wrote:
> >>
> >>
> >> On 08/02/17 22:43, Jack Pham wrote:
> >>> Hi Peter, Sriram, Arnd,
> >>>
> >>> On Mon, Feb 06, 2017 at 05:13:38PM +0800, Peter Chen wrote:
> >>>> From: Arnd Bergmann <arnd@xxxxxxxx>
> >>>>
> >>>> For xhci-hcd platform device, all the DMA parameters are not
> >>>> configured properly, notably dma ops for dwc3 devices. So, set
> >>>> the dma for xhci from sysdev. sysdev is pointing to device that
> >>>> is known to the system firmware or hardware.
> >>>>
> >>>> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
> >>>> Signed-off-by: Sriram Dash <sriram.dash@xxxxxxx>
> >>>> Tested-by: Baolin Wang <baolin.wang@xxxxxxxxxx>
> >>>> Tested-by: Vivek Gautam <vivek.gautam@xxxxxxxxxxxxxx>
> >>>> Tested-by: Alexander Sverdlin <alexander.sverdlin@xxxxxxxxx>
> >>>> Signed-off-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
> >>>> ---
> >>>> diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
> >>>> index 6d33b42..7a9c860 100644
> >>>> --- a/drivers/usb/host/xhci-plat.c
> >>>> +++ b/drivers/usb/host/xhci-plat.c
> >>>
> >>>> -   hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
> >>>> +   hcd = __usb_create_hcd(driver, sysdev, &pdev->dev,
> >>>> +                          dev_name(&pdev->dev), NULL);
> >>>
> >>> As mentioned already in [1], usb_create_shared_hcd() is called to create
> >>> the second bus, however it also needs to be converted.
> >>>
> >>> Not exactly as Roger's suggestion but this worked for me:
> >>>
> >>> -       xhci->shared_hcd = usb_create_shared_hcd(driver, &pdev->dev,
> >>> +       xhci->shared_hcd = __usb_create_hcd(driver, sysdev, &pdev->dev,
> >>>                         dev_name(&pdev->dev), hcd);
> >>
> >> But we're creating a shared_hcd and there is an API for that so why not use it
> >> instead of calling __usb_create_hcd()?
> >>
> >
> > Just realized after I pressed send that there is no sysdev parameter
> > for create_shared_hcd().

Roger, does this change also work for you? If it is, please add a
tested-by tag for my v13 patch set.

-- 

Best Regards,
Peter Chen