linux-kernel - Re: [PATCH v3 13/16] mtd: rawnand: qcom: minor code reorganization for bad block check

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Date:   Mon, 28 May 2018 11:46:47 +0530
From:   Abhishek Sahu <absahu@...eaurora.org>
To:     Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     Boris Brezillon <boris.brezillon@...tlin.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mtd@...ts.infradead.org, Andy Gross <andy.gross@...aro.org>,
        Archit Taneja <architt@...eaurora.org>
Subject: Re: [PATCH v3 13/16] mtd: rawnand: qcom: minor code reorganization
 for bad block check

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