linux-kernel - Re: [PATCH V4 5/9] mtd: replace the hardcode with the onfi

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Message-ID: <51820127.5060003@freescale.com>
Date:	Thu, 2 May 2013 14:01:11 +0800
From:	Huang Shijie <b32955@...escale.com>
To:	"Gupta, Pekon" <pekon@...com>
CC:	"computersforpeace@...il.com" <computersforpeace@...il.com>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"dedekind1@...il.com" <dedekind1@...il.com>,
	"dwmw2@...radead.org" <dwmw2@...radead.org>
Subject: Re: [PATCH V4 5/9] mtd: replace the hardcode with the onfi_feature()

于 2013年05月02日 13:42, Gupta, Pekon 写道:
>>>> -	*busw = 0;
>>>> -	if (le16_to_cpu(p->features)&   1)
>>>> -		*busw = NAND_BUSWIDTH_16;
>>>> +
>>>> +	*busw = (onfi_feature(chip)&   ONFI_FEATURE_16_BIT_BUS) ?
>>>> +			NAND_BUSWIDTH_16 : 0;
>>> Is this really needed ? you have already checked the 'onfi_version'
>> above in
>>> nand_flash_detect_onfi() ..
>>> 	if (!chip->onfi_version) {
>>> 		pr_info("%s: unsupported ONFI version: %d\n",
>> __func__, val);
>>> 		return 0;
>>> 	}
>>>
>>>
>> I think checking the onfi_version has no relationship with this patch. :)
>> This patch is just replace the hardcode for 16-bit onfi nand check.
>>
> [Pekon]: [Patch 3/9]: add a helper to get the supported features
> I mean, do you really need this helper function ?
> +static inline int onfi_feature(struct nand_chip *chip)
> +{
> +       return chip->onfi_version ? le16_to_cpu(chip->onfi_params.features) : 0;
> + }
>
> Following change should have been enough..
> *busw = (le16_to_cpu(p->features)&   ONFI_FEATURE_16_BIT_BUS) ?
> 			NAND_BUSWIDTH_16 : 0;
yes. for this function, it's enough.

But we may use the onfi_feature() in other places, such as some drivers. That's reason why i added this helper.



thanks
Huang Shijie










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