linux-kernel - Re: [PATCH V3] mtd: rawnand: qcom: Update code word value for raw read

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Message-ID: <b6473b7de57aa10682a5ca1651f6e620@codeaurora.org>
Date:   Thu, 02 Sep 2021 11:23:43 +0530
From:   mdalam@...eaurora.org
To:     Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     mani@...nel.org, linux-mtd@...ts.infradead.org,
        linux-kernel@...r.kernel.org, sricharan@...eaurora.org,
        stable@...nel.org
Subject: Re: [PATCH V3] mtd: rawnand: qcom: Update code word value for raw
 read

On 2021-09-01 20:06, Miquel Raynal wrote:
> Md Sadre Alam <mdalam@...eaurora.org> wrote on Wed,  1 Sep 2021
> 16:23:33 +0530:
> 
>> Fixes: 503ee5aa ("mtd: rawnand: qcom: update last code word register")
>> Cc: stable@...nel.org
>> Signed-off-by: Md Sadre Alam <mdalam@...eaurora.org>
>> ---
>> [V3]
>>  * Added Fixes tag
>>  * Removed change log from commit message.
>> 
>>     From QPIC V2 onwards there is a separate register to read
>>     last code word "QPIC_NAND_READ_LOCATION_LAST_CW_n".
>> 
>>     qcom_nandc_read_cw_raw() is used to read only one code word
>>     at a time. If we will configure number of code words to 1 in
>>     in QPIC_NAND_DEV0_CFG0 register then QPIC controller thinks
>>     its reading the last code word, since from QPIC V2 onwards
>>     we are having separate register to read the last code word,
>>     we have to configure "QPIC_NAND_READ_LOCATION_LAST_CW_n"
>>     register to fetch data from controller buffer to system
>>     memory.
> 
> Really?
> 
> It's not your first contribution, you know what a changelog is and what
> a commit message is, right? So please, keep the commit message
> ("why" your change is needed) where it was and only put
> the changelog (the differences between two versions) below the three
> dashes '---'.
> 
   Sorry for misinterpreting your comments.

   I have addressed your comment in patch V4

>> 
>>  drivers/mtd/nand/raw/qcom_nandc.c | 8 ++++++--
>>  1 file changed, 6 insertions(+), 2 deletions(-)
>> 
>> diff --git a/drivers/mtd/nand/raw/qcom_nandc.c 
>> b/drivers/mtd/nand/raw/qcom_nandc.c
>> index ef0bade..04e6f7b 100644
>> --- a/drivers/mtd/nand/raw/qcom_nandc.c
>> +++ b/drivers/mtd/nand/raw/qcom_nandc.c
>> @@ -1676,13 +1676,17 @@ qcom_nandc_read_cw_raw(struct mtd_info *mtd, 
>> struct nand_chip *chip,
>>  	struct nand_ecc_ctrl *ecc = &chip->ecc;
>>  	int data_size1, data_size2, oob_size1, oob_size2;
>>  	int ret, reg_off = FLASH_BUF_ACC, read_loc = 0;
>> +	int raw_cw = cw;
>> 
>>  	nand_read_page_op(chip, page, 0, NULL, 0);
>>  	host->use_ecc = false;
>> 
>> +	if (nandc->props->qpic_v2)
>> +		raw_cw = ecc->steps - 1;
>> +
>>  	clear_bam_transaction(nandc);
>>  	set_address(host, host->cw_size * cw, page);
>> -	update_rw_regs(host, 1, true, cw);
>> +	update_rw_regs(host, 1, true, raw_cw);
>>  	config_nand_page_read(chip);
>> 
>>  	data_size1 = mtd->writesize - host->cw_size * (ecc->steps - 1);
>> @@ -1711,7 +1715,7 @@ qcom_nandc_read_cw_raw(struct mtd_info *mtd, 
>> struct nand_chip *chip,
>>  		nandc_set_read_loc(chip, cw, 3, read_loc, oob_size2, 1);
>>  	}
>> 
>> -	config_nand_cw_read(chip, false, cw);
>> +	config_nand_cw_read(chip, false, raw_cw);
>> 
>>  	read_data_dma(nandc, reg_off, data_buf, data_size1, 0);
>>  	reg_off += data_size1;