LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
* [PATCH V2] mtd: rawnand: qcom: Update code word value for raw read
@ 2021-08-31  8:56 Md Sadre Alam
  2021-08-31 11:42 ` Miquel Raynal
  0 siblings, 1 reply; 3+ messages in thread
From: Md Sadre Alam @ 2021-08-31  8:56 UTC (permalink / raw)
  To: miquel.raynal, mani, boris.brezillon, linux-mtd, linux-kernel
  Cc: mdalam, sricharan, stable

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@kernel.org
Signed-off-by: Md Sadre Alam <mdalam@codeaurora.org>

[V2]
 * Added stable tags
---
 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


^ permalink raw reply	[flat|nested] 3+ messages in thread

end of thread, other threads:[~2021-09-01 10:55 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-08-31  8:56 [PATCH V2] mtd: rawnand: qcom: Update code word value for raw read Md Sadre Alam
2021-08-31 11:42 ` Miquel Raynal
2021-09-01 10:55   ` mdalam

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).