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From:   Anurag Kumar Vulisha <anuragku@xilinx.com>
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>
CC:     Mathias Nyman <mathias.nyman@intel.com>,
        "linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: RE: [PATCH] usb: host: xhci-plat: Iterate over parent nodes for
 finding quirks
Thread-Topic: [PATCH] usb: host: xhci-plat: Iterate over parent nodes for
 finding quirks
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Date:   Tue, 12 Jun 2018 07:03:39 +0000
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Hi Greg,

Please let me know if you have any comments on this patch.=20

Thanks,
Anurag Kumar Vulisha

>-----Original Message-----
>From: Anurag Kumar Vulisha
>Sent: Wednesday, June 06, 2018 12:11 AM
>To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
>Cc: Mathias Nyman <mathias.nyman@intel.com>; linux-usb@vger.kernel.org; li=
nux-
>kernel@vger.kernel.org
>Subject: RE: [PATCH] usb: host: xhci-plat: Iterate over parent nodes for f=
inding quirks
>
>Hi Greg,
>
>>-----Original Message-----
>>From: Greg Kroah-Hartman [mailto:gregkh@linuxfoundation.org]
>>Sent: Tuesday, June 05, 2018 8:55 PM
>>To: Anurag Kumar Vulisha <anuragku@xilinx.com>
>>Cc: Mathias Nyman <mathias.nyman@intel.com>; linux-usb@vger.kernel.org;
>>linux- kernel@vger.kernel.org
>>Subject: Re: [PATCH] usb: host: xhci-plat: Iterate over parent nodes
>>for finding quirks
>>
>>On Tue, Jun 05, 2018 at 08:50:56PM +0530, Anurag Kumar Vulisha wrote:
>>> In xhci_plat_probe() both sysdev and pdev->dev are being used for
>>> finding quirks. There are some drivers(like dwc3 host.c) which adds
>>> quirks(like usb3-lpm-capable) into pdev and the logic present in
>>> xhci_plat_probe() checks for quirks in either sysdev or pdev for
>>> finding the quirks. Because of this logic, some of the quirks are
>>> getting missed(usb3-lpm-capable quirk added by dwc3 host.c driver is
>>> getting missed).This patch fixes this by iterating over all the
>>> available parents for finding the quirks. In this way all the quirks
>>> which are present in child or parent are correctly updated.
>>>
>>> Signed-off-by: Anurag Kumar Vulisha <anurag.kumar.vulisha@xilinx.com>
>>
>>So this is a bugfix?  If so, how far back in the kernel releases should i=
t go to?
>>
>I feel this is as a bugfix. This problem started with this patch
>"usb: xhci: use bus->sysdev for DMA configuration (4c39d4b949d36faf)"
>where pdev->dev is replaced with sysdev. If I am not wrong this bug is pre=
sent since
>4.12 kernel release.
>
>Thanks,
>Anurag kumar Vulisha
>
>>thanks,
>>
>>greg k-h