[PATCH V5] mtd: rawnand: qcom: Update code word value for raw read
mdalam at codeaurora.org
mdalam at codeaurora.org
Tue Sep 7 00:07:14 PDT 2021
On 2021-09-07 12:18, Miquel Raynal wrote:
> mdalam at codeaurora.org wrote on Tue, 7 Sep 2021 12:09:31 +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.
>>
>> Fixes: 503ee5aad43054a26cfd5cc592a31270c05539cd ("mtd: rawnand: qcom:
>> update last code word register")
>
> Still wrong. It's 12 digits, as reported by Manivannan.
Updated in patch V6.
>
>> Cc: stable at kernel.org
>> Signed-off-by: Md Sadre Alam <mdalam at codeaurora.org>
>> ---
>> Changes in V5:
>>
>> * Incorporated "hash commit" comment from Mani.
>> * Updated commit hash
>>
>> Changes in V4:
>>
>> * Incorporated "Change log" comment from Miquèl
>> * Updated change log
>>
>> Changes in V3:
>>
>> * Incorporated "Fixes tags are missing" comment from Miquèl
>> * Added Fixes tag Fixes:503ee5aa ("mtd: rawnand: qcom: update last
>> code word register")
>>
>>
>> Changes in V2:
>>
>> * Incorporated "stable tags are missing" comment from Miquèl
>> * Added stable tags Cc:stable at kernel.org
>>
>>
>>
>> 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
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