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

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Date:   Thu, 9 Feb 2017 17:40:50 +0530
From:   Vivek Gautam <vivek.gautam@...eaurora.org>
To:     Roger Quadros <rogerq@...com>
Cc:     Jack Pham <jackp@...eaurora.org>, Peter Chen <peter.chen@....com>,
        Greg KH <gregkh@...uxfoundation.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Ulf Hansson <ulf.hansson@...aro.org>, broonie@...nel.org,
        sre@...nel.org, "robh+dt" <robh+dt@...nel.org>,
        shawnguo@...nel.org, rjw@...ysocki.net,
        Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
        Heiko Stübner <heiko@...ech.de>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>, p.zabel@...gutronix.de,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Pawel Moll <pawel.moll@....com>,
        Mark Rutland <mark.rutland@....com>,
        Linux USB Mailing List <linux-usb@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>, s.hauer@...gutronix.de,
        mail@...iej.szmigiero.name, troy.kisky@...ndarydevices.com,
        Fabio Estevam <festevam@...il.com>, oscar@...andei.net,
        Stephen Boyd <stephen.boyd@...aro.org>,
        linux-pm@...r.kernel.org,
        Joshua Clayton <stillcompiling@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        mka@...omium.org, Vaibhav Hiremath <vaibhav.hiremath@...aro.org>,
        Gary Bisson <gary.bisson@...ndarydevices.com>,
        Hans Verkuil <hverkuil@...all.nl>, krzk@...nel.org,
        Sriram Dash <sriram.dash@....com>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>
Subject: Re: [PATCH v12 6/9] usb: xhci: use bus->sysdev for DMA configuration

On Thu, Feb 9, 2017 at 5:24 PM, Roger Quadros <rogerq@...com> 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@...db.de>
>>>>
>>>> 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@...db.de>
>>>> Signed-off-by: Sriram Dash <sriram.dash@....com>
>>>> Tested-by: Baolin Wang <baolin.wang@...aro.org>
>>>> Tested-by: Vivek Gautam <vivek.gautam@...eaurora.org>
>>>> Tested-by: Alexander Sverdlin <alexander.sverdlin@...ia.com>
>>>> Signed-off-by: Mathias Nyman <mathias.nyman@...ux.intel.com>
>>>> ---
>>>> 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().

That's right. The create_shared_hcd() makes use of only pdev->dev,
and we need to configure dma for shared_hcd as well though sysdev.

Sorry my mail client didn't show this mail in time. Please ignore my
earlier comment.

>
>>>         if (!xhci->shared_hcd) {
>>>                 ret = -ENOMEM;
>>>
>>> Without this, SuperSpeed devices fail to enumerate:
>>>
>>>  usb 2-1: new SuperSpeed USB device number 2 using xhci-hcd
>>>  usb 2-1: device descriptor read/8, error -11
>>>  usb 2-1: new SuperSpeed USB device number 2 using xhci-hcd
>>>  usb 2-1: device descriptor read/8, error -11
>>>  usb 2-1: new SuperSpeed USB device number 3 using xhci-hcd
>>>  usb 2-1: device descriptor read/8, error -11
>>>  usb 2-1: new SuperSpeed USB device number 3 using xhci-hcd
>>>  usb 2-1: device descriptor read/8, error -11
>>>  <and continues...>
>>>
>>> Thanks,
>>> Jack
>>>
>>> [1] https://lkml.org/lkml/2016/12/9/240
>>>
>>
>
> --
> cheers,
> -roger
> --
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