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

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Date:   Thu, 9 Feb 2017 09:41:13 +0800
From:   Peter Chen <hzpeterchen@...il.com>
To:     Jack Pham <jackp@...eaurora.org>
Cc:     Peter Chen <peter.chen@....com>, gregkh@...uxfoundation.org,
        stern@...land.harvard.edu, ulf.hansson@...aro.org,
        broonie@...nel.org, sre@...nel.org, robh+dt@...nel.org,
        shawnguo@...nel.org, rjw@...ysocki.net, dbaryshkov@...il.com,
        heiko@...ech.de, linux-arm-kernel@...ts.infradead.org,
        p.zabel@...gutronix.de, devicetree@...r.kernel.org,
        pawel.moll@....com, mark.rutland@....com,
        linux-usb@...r.kernel.org, arnd@...db.de, s.hauer@...gutronix.de,
        mail@...iej.szmigiero.name, troy.kisky@...ndarydevices.com,
        festevam@...il.com, oscar@...andei.net, stephen.boyd@...aro.org,
        linux-pm@...r.kernel.org, stillcompiling@...il.com,
        linux-kernel@...r.kernel.org, mka@...omium.org,
        vaibhav.hiremath@...aro.org, gary.bisson@...ndarydevices.com,
        hverkuil@...all.nl, krzk@...nel.org,
        Sriram Dash <sriram.dash@....com>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>,
        Roger Quadros <rogerq@...com>
Subject: Re: [PATCH v12 6/9] usb: xhci: use bus->sysdev for DMA configuration

On Wed, Feb 08, 2017 at 12:43:00PM -0800, 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);
>         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
> 

Do you work at same platform with Vivek Gautam? I see his tested-by
tag in this patch.

I have no dwc3 platform to test, I only got patches from [1], and rebase to
Greg's usb-next, the rebase has a conflict, and I made a 
change which is similar to revert below patch, but it is definitely
not your problem.

commit 488dc164914ff5ce5e913abd32048d28fc0d06b8
Author: Mathias Nyman <mathias.nyman@...ux.intel.com>
Date:   Fri Jan 20 15:38:24 2017 +0200

    xhci: remove WARN_ON if dma mask is not set for platform devices


[1] http://www.spinics.net/lists/linux-usb/msg152375.html

-- 

Best Regards,
Peter Chen