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

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Date:	Thu, 2 May 2013 05:42:19 +0000
From:	"Gupta, Pekon" <pekon@...com>
To:	Huang Shijie <b32955@...escale.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()

> >> -	*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;


with regards, pekon