Messages in this thread Patch in this message | | | From | Md Sadre Alam <> | Subject | [PATCH V4] mtd: rawnand: qcom: Update code word value for raw read | Date | Thu, 2 Sep 2021 11:19:23 +0530 |
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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: 503ee5aa ("mtd: rawnand: qcom: update last code word register") Cc: stable@kernel.org Signed-off-by: Md Sadre Alam <mdalam@codeaurora.org> --- [V4] * Added commit message * Added changelog
In commit 503ee5aa added QPIC V2 support. Since QPIC V2 onwards there is separate register to get last CW data. If total number of CW configred is 1 then , QPIC controller treat this as last CW and software shhould copy data to memory via QPIC_NAND_READ_LOCATION_LAST_CW_n register instead of QPIC_NAND_READ_LOCATION_n. Since in raw read we are configuring total number of CW 1, this change fixes this if total number of CW 1 then make this as last CW. raw_cw = ecc->steps - 1; since ecc->steps holds total number of CWs.
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; -- 2.7.4
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