linux-kernel - Re: [PATCH v6 2/2] mtd: rawnand: meson: add support for Amlogic NAND flash controller

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Message-ID: <7e36bf4c-69a1-a570-f086-75f8ad53d518@amlogic.com>
Date:   Fri, 16 Nov 2018 16:29:07 +0800
From:   Liang Yang <liang.yang@...ogic.com>
To:     Boris Brezillon <boris.brezillon@...tlin.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>
CC:     Rob Herring <robh@...nel.org>, Hanjie Lin <hanjie.lin@...ogic.com>,
        Victor Wan <victor.wan@...ogic.com>,
        Jianxin Pan <jianxin.pan@...ogic.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Richard Weinberger <richard@....at>,
        Yixun Lan <yixun.lan@...ogic.com>,
        <linux-kernel@...r.kernel.org>,
        Marek Vasut <marek.vasut@...il.com>,
        Jian Hu <jian.hu@...ogic.com>, <linux-mtd@...ts.infradead.org>,
        Kevin Hilman <khilman@...libre.com>,
        Carlo Caione <carlo@...one.org>,
        <linux-amlogic@...ts.infradead.org>,
        Brian Norris <computersforpeace@...il.com>,
        David Woodhouse <dwmw2@...radead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Jerome Brunet <jbrunet@...libre.com>,
        Wolfram Sang <wsa@...-dreams.de>
Subject: Re: [PATCH v6 2/2] mtd: rawnand: meson: add support for Amlogic NAND
 flash controller

Hi Boris and Miquel,

understand. i will move helpers into nfc driver to avoid some errors 
when sending the patch.

On 2018/11/15 21:09, Boris Brezillon wrote:
> On Thu, 15 Nov 2018 14:04:00 +0100
> Miquel Raynal <miquel.raynal@...tlin.com> wrote:
> 
>> Hi Liang,
>>
>> Liang Yang <liang.yang@...ogic.com> wrote on Thu, 15 Nov 2018 19:25:07
>> +0800:
>>
>>> Hi Boris,
>>>
>>> I have implemented dma access base on these helpers you provided below.
>>> we prepare to send v7 version now, so when will these helpers be pushed?
>>
>> Thanks for your work. You can send the v7 so we will have a look at the
>> overall driver; but since we raised the DMA buffers issue we had a
>> discussion with Boris about how to handle them and I think we are going
>> to adopt the same solution as Wolfram in the I2C subsystem: manual
>> flagging. Sadly, this is probably the best we can do to ensure proper
>> DMA support.
>>
>> There is nothing set is stone yet but I started a small rework to
>> handle MTD operations differently (and add a DMA_SAFE flag), you can
>> have a look there [1]. Don't base your work on it for now as it is just
>> a preliminary version, subject to big changes.
> 
> In order to not block the driver, I'd suggest that you move the helper
> I proposed directly into your driver and prefix them with 'meson_'.
> 
> .
>