linux-kernel - Re: [PATCH v5 0/4] usb: xhci: Add support for Renesas USB controllers

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Date:   Wed, 8 Jan 2020 18:00:48 +0200
From:   Mathias Nyman <mathias.nyman@...ux.intel.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Vinod Koul <vkoul@...nel.org>
Cc:     John Stultz <john.stultz@...aro.org>,
        Mathias Nyman <mathias.nyman@...el.com>,
        linux-arm-msm@...r.kernel.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Christian Lamparter <chunkeey@...glemail.com>,
        linux-usb@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Todd Kjos <tkjos@...gle.com>,
        Alistair Delva <adelva@...gle.com>
Subject: Re: [PATCH v5 0/4] usb: xhci: Add support for Renesas USB controllers

On 8.1.2020 8.24, Greg Kroah-Hartman wrote:
> On Wed, Jan 08, 2020 at 09:37:07AM +0530, Vinod Koul wrote:
>> Hi John,
>>
>> On 07-01-20, 11:51, John Stultz wrote:
>>> On Wed, Nov 6, 2019 at 12:40 AM Vinod Koul <vkoul@...nel.org> wrote:
>>>>
>>>> This series add support for Renesas USB controllers uPD720201 and uPD720202.
>>>> These require firmware to be loaded and in case devices have ROM those can
>>>> also be programmed if empty. If ROM is programmed, it runs from ROM as well.
>>>>
>>>> This includes two patches from Christian which supported these controllers
>>>> w/o ROM and later my patches for ROM support and multiple firmware versions.
>>>>
>>>
>>> Hey Vinod!
>>>     In pushing this series to one of the Android trees for the db845c,
>>> there was some concern raised that this series is adding a lot of
>>> renesas specific logic to the more generic xhci-pci driver. There was
>>> some question if instead that logic should be added to its own
>>> file/module? Do you have any thoughts on this?
>>
>> TBH I have not thought about that and in previous post neither Greg or
>> Mathias gave a feedback that this was not acceptable...
>>
>> We can think about splitting but apart from firmware load there is not
>> much extra functionality that we need to add, the controller behaviour
>> as a standard xhci-pci. So i am not sure if we gain much by splitting.
>>
>>> Also, It seems there hasn't been much feedback on this for a few
>>> months now. Is there a newer version of the patchset I should sync
>>> with? Do you have plans to resubmit soon?
>>
>> Well am still waiting for feedback :( I dont have any update on top of
>> this, I can repost but I dont think that really serves a purpose.
>>
>> I would really like to hear from Greg if this series is acceptable and
>> if not what would he like to see changed.
> 
> Greg is not the xhci maintainer :)
> 

Reviewing this always got bumped down on my todo list as other urgent issues
came up.

I think the concern about adding this amount of renesas specific code to
xhci-pci.c is valid. This series adds over 900 lines of Renesas FW loading
code to a 600 line xhci-pci.c
  
-Mathias