Re: [PATCH V2] mtd: rawnand: qcom: Update code word value for raw read

[mdalam]

On 2021-08-31 17:12, Miquel Raynal wrote:
> Hi Md,
>
> Md Sadre Alam <mdalam@xxxxxxxxxxxxxx> wrote on Tue, 31 Aug 2021
> 14:26:40 +0530:
>
> > 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.
> >
> > Cc: stable@xxxxxxxxxx
>
> You miss the Fixes tag which is certainly the most important.

  Updated in V3 patch.
> > Signed-off-by: Md Sadre Alam <mdalam@xxxxxxxxxxxxxx>
> >
> > [V2]
> >  * Added stable tags
>
> The changelog should not be part of the commit message.
> You should put it...
  Updated in V3 patch.

> > ---
>
> ...here.
>
> >  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;
>
> Thanks,
> Miquèl