Re: [PATCH V2 00/22] mmc: Add Command Queue support

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On 20/06/17 11:01, Bough Chen wrote:
>> -----Original Message-----
>> From: linux-mmc-owner@xxxxxxxxxxxxxxx [mailto:linux-mmc-
>> owner@xxxxxxxxxxxxxxx] On Behalf Of Bough Chen
>> Sent: Thursday, June 15, 2017 7:50 PM
>> To: Adrian Hunter <adrian.hunter@xxxxxxxxx>; Linus Walleij
>> <linus.walleij@xxxxxxxxxx>
>> Cc: Ulf Hansson <ulf.hansson@xxxxxxxxxx>; linux-mmc <linux-
>> mmc@xxxxxxxxxxxxxxx>; Alex Lemberg <alex.lemberg@xxxxxxxxxxx>; Mateusz
>> Nowak <mateusz.nowak@xxxxxxxxx>; Yuliy Izrailov
>> <Yuliy.Izrailov@xxxxxxxxxxx>; Jaehoon Chung <jh80.chung@xxxxxxxxxxx>;
>> Dong Aisheng <dongas86@xxxxxxxxx>; Das Asutosh
>> <asutoshd@xxxxxxxxxxxxxx>; Zhangfei Gao <zhangfei.gao@xxxxxxxxx>;
>> Dorfman Konstantin <kdorfman@xxxxxxxxxxxxxx>; David Griego
>> <david.griego@xxxxxxxxxx>; Sahitya Tummala <stummala@xxxxxxxxxxxxxx>;
>> Harjani Ritesh <riteshh@xxxxxxxxxxxxxx>; Venu Byravarasu
>> <vbyravarasu@xxxxxxxxxx>; Shawn Lin <shawn.lin@xxxxxxxxxxxxxx>
>> Subject: RE: [PATCH V2 00/22] mmc: Add Command Queue support
>>
>>> -----Original Message-----
>>> From: Adrian Hunter [mailto:adrian.hunter@xxxxxxxxx]
>>> Sent: Thursday, June 15, 2017 7:38 PM
>>> To: Bough Chen <haibo.chen@xxxxxxx>; Linus Walleij
>>> <linus.walleij@xxxxxxxxxx>
>>> Cc: Ulf Hansson <ulf.hansson@xxxxxxxxxx>; linux-mmc <linux-
>>> mmc@xxxxxxxxxxxxxxx>; Alex Lemberg <alex.lemberg@xxxxxxxxxxx>;
>> Mateusz
>>> Nowak <mateusz.nowak@xxxxxxxxx>; Yuliy Izrailov
>>> <Yuliy.Izrailov@xxxxxxxxxxx>; Jaehoon Chung <jh80.chung@xxxxxxxxxxx>;
>>> Dong Aisheng <dongas86@xxxxxxxxx>; Das Asutosh
>>> <asutoshd@xxxxxxxxxxxxxx>; Zhangfei Gao <zhangfei.gao@xxxxxxxxx>;
>>> Dorfman Konstantin <kdorfman@xxxxxxxxxxxxxx>; David Griego
>>> <david.griego@xxxxxxxxxx>; Sahitya Tummala <stummala@xxxxxxxxxxxxxx>;
>>> Harjani Ritesh <riteshh@xxxxxxxxxxxxxx>; Venu Byravarasu
>>> <vbyravarasu@xxxxxxxxxx>; Shawn Lin <shawn.lin@xxxxxxxxxxxxxx>
>>> Subject: Re: [PATCH V2 00/22] mmc: Add Command Queue support
>>>
>>> On 24/04/17 12:14, Bough Chen wrote:
>>>>> -----Original Message-----
>>>>> From: linux-mmc-owner@xxxxxxxxxxxxxxx [mailto:linux-mmc-
>>>>> owner@xxxxxxxxxxxxxxx] On Behalf Of Linus Walleij
>>>>> Sent: Monday, April 24, 2017 4:13 PM
>>>>> To: Adrian Hunter <adrian.hunter@xxxxxxxxx>
>>>>> Cc: Ulf Hansson <ulf.hansson@xxxxxxxxxx>; linux-mmc <linux-
>>>>> mmc@xxxxxxxxxxxxxxx>; Alex Lemberg <alex.lemberg@xxxxxxxxxxx>;
>>>>> Mateusz Nowak <mateusz.nowak@xxxxxxxxx>; Yuliy Izrailov
>>>>> <Yuliy.Izrailov@xxxxxxxxxxx>; Jaehoon Chung
>>>>> <jh80.chung@xxxxxxxxxxx>; Dong Aisheng <dongas86@xxxxxxxxx>; Das
>>>>> Asutosh <asutoshd@xxxxxxxxxxxxxx>; Zhangfei Gao
>>>>> <zhangfei.gao@xxxxxxxxx>; Dorfman Konstantin
>>>>> <kdorfman@xxxxxxxxxxxxxx>; David Griego <david.griego@xxxxxxxxxx>;
>>>>> Sahitya Tummala <stummala@xxxxxxxxxxxxxx>; Harjani Ritesh
>>>>> <riteshh@xxxxxxxxxxxxxx>; Venu Byravarasu <vbyravarasu@xxxxxxxxxx>;
>>>>> Shawn Lin <shawn.lin@xxxxxxxxxxxxxx>
>>>>> Subject: Re: [PATCH V2 00/22] mmc: Add Command Queue support
>>>>>
>>>>> On Sat, Apr 22, 2017 at 9:45 AM, Adrian Hunter
>>>>> <adrian.hunter@xxxxxxxxx>
>>>>> wrote:
>>>>>
>>>>>> Ulf and Linus have been doing a great job of keeping this moving,
>>>>>> but it would be nice to see some others taking more interest.  The
>>>>>> first command queue patches were posted in February 2014, over 3
>>>>>> years
>>> ago!
>>>>>
>>>>> I agree.
>>>>>
>>>>> I think both me & Ulf would also be doing more work if we had
>>>>> easily accessible hardware with upstream host controller support
>>>>> for native
>>> command queueing.
>>>>> (Hm, was just reading in libata about NCQ ...
>>>>> déja vu ... https://en.wikipedia.org/wiki/Native_Command_Queuing)
>>>>>
>>>>> Do we have some hardware with host-backed command queueing out
>>> there
>>>>> that is easily obtained and has upstream support for the basic system?
>>>>>
>>>>
>>>> The coming i.MX8 support hardware CMDQ, I will have a try when I get
>>>> one
>>> on May or June.
>>>
>>> I have sent updated patches.  Will you have a chance to test hardware CMDQ?
>>
>> Yes, I will try to apply these patches on our local 4.9 branch.  Will give you the
>> test result.
>>
> 
> Hi Adrian,
> 
> i.MX8 still not upstream, and just work on our local 4.9 branch, to test your branch, I need to cherry pick
> some mmc patches and block layer patches, I'm doing this now, but need some time.

Thanks for the update.  I realize backporting anything related to mmc block
is now a big task.

> 
> 
>> Best Regards,
>> Haibo Chen
>>   칻 & ~ &   +-  ݶ  w  ˛   m b  f ȧ   ܨ}   Ơz &j:+v        zZ+  +zf   h   ~    i   z  w   ?
>> & )ߢf

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