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

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Message-Id: <1630493613-8158-1-git-send-email-mdalam@codeaurora.org>
Date:   Wed,  1 Sep 2021 16:23:33 +0530
From:   Md Sadre Alam <mdalam@...eaurora.org>
To:     miquel.raynal@...tlin.com, mani@...nel.org,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     mdalam@...eaurora.org, sricharan@...eaurora.org, stable@...nel.org
Subject: [PATCH V3] mtd: rawnand: qcom: Update code word value for raw read

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.
 
 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