Commit f60f5741 authored by Md Sadre Alam's avatar Md Sadre Alam Committed by Miquel Raynal
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mtd: rawnand: qcom: Update code word value for raw read 



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: default avatarMd Sadre Alam <mdalam@codeaurora.org>
Signed-off-by: default avatarMiquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/1630998357-1359-1-git-send-email-mdalam@codeaurora.org
parent 6880fa6c

drivers/mtd/nand/raw/qcom_nandc.c

+6 −2
Original line number Diff line number Diff line
@@ -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;