linux-kernel - Re: [PATCH v5 05/12] mtd: pxa3xx_nand: rework flash detection and timing setup

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Date:	Sat, 16 May 2015 18:23:23 -0300
From:	Ezequiel Garcia <ezequiel@...guardiasur.com.ar>
To:	Antoine Tenart <antoine.tenart@...e-electrons.com>
CC:	sebastian.hesselbarth@...il.com, dwmw2@...radead.org,
	computersforpeace@...il.com, boris.brezillon@...e-electrons.com,
	zmxu@...vell.com, jszhang@...vell.com,
	linux-arm-kernel@...ts.infradead.org,
	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 05/12] mtd: pxa3xx_nand: rework flash detection and
 timing setup



On 05/12/2015 11:39 AM, Antoine Tenart wrote:
> Ezequiel,
> 
> On Mon, May 11, 2015 at 07:10:56PM -0300, Ezequiel Garcia wrote:
>>
>> On 05/11/2015 11:58 AM, Antoine Tenart wrote:
>> [..]
>>> -
>>> -	/* calculate flash information */
>>> -	host->read_id_bytes = (f->page_size == 2048) ? 4 : 2;
>>> -
>>
>> [..]
>>> @@ -1732,6 +1669,7 @@ static int alloc_nand_resource(struct platform_device *pdev)
>>>  		host->mtd = mtd;
>>>  		host->cs = cs;
>>>  		host->info_data = info;
>>> +		host->read_id_bytes = 4;
>>
>> Are you sure this is correct? The value is set according to the page
>> size before this patch.
> 
> Before reading the ID, the pxa3xx driver uses a default configuration,
> builtin_flash_types[0], which defines a page size of 2048 leading to set
> host->read_id_bytes to 4.
> 
> I'm using this default value here.
> 
> There might be an issue, as host->read_id_bytes isn't updated after
> reading the ID (and getting the actual page size). I don't know if this
> can be a problem. I can modify pxa3xx_nand_config_flash() to update
> host->read_id_bytes if needed. What do you think?
> 

Well, once the device is detected, READ_ID shouldn't be used, so I'm not
sure what's the point of that.

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