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

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Date:   Wed, 8 Feb 2017 17:27:31 +0530
From:   Vivek Gautam <vivek.gautam@...eaurora.org>
To:     Peter Chen <peter.chen@....com>
Cc:     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, 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,
        festevam@...il.com, oscar@...andei.net,
        Stephen Boyd <stephen.boyd@...aro.org>,
        linux-pm@...r.kernel.org, stillcompiling@...il.com,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        mka@...omium.org, vaibhav.hiremath@...aro.org,
        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

Hi,


On Mon, Feb 6, 2017 at 2:43 PM, Peter Chen <peter.chen@....com> 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>
> ---

This patch doesn't work for me anymore on db820c target [1].
While the same kernel with reverts of patches [2] [3] and an older
patch [4] by Grygorii Strashko works [5].

[1] https://github.com/vivekgautam1/linux/tree/linux-v4.10-rc7-usb-db820c-nonworking
[2] 8c9f2de459c7 usb: dwc3: Do not set dma coherent mask
[3] d64ff406e51e usb: dwc3: use bus->sysdev for DMA configuration
[4] https://lkml.org/lkml/2016/4/25/813
[5] https://github.com/vivekgautam1/linux/tree/linux-v4.10-rc7-usb-db820c


regards
Vivek

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