linux-kernel - Re: [PATCH 3/3] mtd: nand: pxa3xx-nand: fix readid without keep

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Message-ID: <CAAEAJfC_QM=fZOZ1guThuY7hXbAbr7O7U6p3aewqOzVaAsbuMQ@mail.gmail.com>
Date:	Mon, 17 Aug 2015 14:31:34 -0300
From:	Ezequiel Garcia <ezequiel@...guardiasur.com.ar>
To:	Robert Jarzmik <robert.jarzmik@...e.fr>
Cc:	Brian Norris <computersforpeace@...il.com>,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	David Woodhouse <dwmw2@...radead.org>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Antoine Tenart <antoine.tenart@...e-electrons.com>
Subject: Re: [PATCH 3/3] mtd: nand: pxa3xx-nand: fix readid without keep_config

On 16 August 2015 at 19:22, Robert Jarzmik <robert.jarzmik@...e.fr> wrote:
> Ezequiel Garcia <ezequiel@...guardiasur.com.ar> writes:
>
>> On 11 Aug 09:57 PM, Robert Jarzmik wrote:
>>> The cases of READID detection are broken on pxa3xx. The reason is that
>>> in the early stages of nand probing, ie. at pxa3xx_nand_scan(), we
>>> always have :
>>>  - info->use_dma = 0 (regardless of dma support yet)
>>>  - info->chunk_size = 0 (not yet detected)
>>>
>>> The READID issued by pxa3xx_nand_scan() will therefore end up in
>>> handle_data_pio(), and do_bytes will be 0, leading to not reading the
>>> nand id, and blocking detection.
>>>
>>> This doesn't happen if "keep_config" is used, which is probably the most
>>> tested case.
>>>
>>> Signed-off-by: Robert Jarzmik <robert.jarzmik@...e.fr>
>>> Fixes: 70ed85232a93 ("mtd: nand: pxa3xx: Introduce multiple page I/O
>>> support")
>>
>> To be fair, Antoine submitted this a while ago:
>>
>> http://lists.infradead.org/pipermail/linux-mtd/2015-April/058739.html
>>
>> Not sure which one takes precedence in such a case (and yours
>> has a proper Fixes tag).
> His has precedence. How is it that a fix patch is not yet merge since April ?
> Is it because it's part of a still in review serie ?
>

Exactly. And because I thought it was needed for Berlin support,
so it wasn't a regression.

-- 
Ezequiel García, VanguardiaSur
www.vanguardiasur.com.ar
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