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Date:   Mon, 28 May 2018 11:46:47 +0530
From:   Abhishek Sahu <absahu@codeaurora.org>
To:     Miquel Raynal <miquel.raynal@bootlin.com>
Cc:     Boris Brezillon <boris.brezillon@bootlin.com>,
        David Woodhouse <dwmw2@infradead.org>,
        Brian Norris <computersforpeace@gmail.com>,
        Marek Vasut <marek.vasut@gmail.com>,
        Richard Weinberger <richard@nod.at>,
        Cyrille Pitchen <cyrille.pitchen@wedev4u.fr>,
        linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-mtd@lists.infradead.org, Andy Gross <andy.gross@linaro.org>,
        Archit Taneja <architt@codeaurora.org>
Subject: Re: [PATCH v3 13/16] mtd: rawnand: qcom: minor code reorganization
 for bad block check
In-Reply-To: <20180526104900.139dd19b@xps13>
References: <1527250904-21988-1-git-send-email-absahu@codeaurora.org>
 <1527250904-21988-14-git-send-email-absahu@codeaurora.org>
 <20180526104900.139dd19b@xps13>
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On 2018-05-26 14:28, Miquel Raynal wrote:
> Hi Abhishek,
> 
> 
>> @@ -2141,12 +2127,10 @@ static int qcom_nandc_block_bad(struct 
>> mtd_info *mtd, loff_t ofs)
>>  		goto err;
>>  	}
>> 
>> -	bbpos = mtd->writesize - host->cw_size * (ecc->steps - 1);
>> -
>> -	bad = nandc->data_buffer[bbpos] != 0xff;
>> +	bad = bbm_bytes_buf[0] != 0xff;
> 
> BTW, as there are host->bbm_size bytes that can inform on the block
> state, don't we need to check all of them?
> 

  We are checking all of them.
  host->bbm_size will be either 1 (for NAND_BUSWIDTH_8) or
  2 (for NAND_BUSWIDTH_16).

  
https://elixir.bootlin.com/linux/v4.17-rc7/source/drivers/mtd/nand/raw/qcom_nandc.c#L2347

  Thanks,
  Abhishek

>> 
>>  	if (chip->options & NAND_BUSWIDTH_16)
>> -		bad = bad || (nandc->data_buffer[bbpos + 1] != 0xff);
>> +		bad = bad || (bbm_bytes_buf[1] != 0xff);
>>  err:
>>  	return bad;
>>  }
> 
> Thanks,
> Miquèl