linux-kernel - [PATCH v2 1/2] mtd: rawnand: qcom: Fix broken erase in misc_cmd_type in exec

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Date: Mon, 25 Mar 2024 11:30:47 +0100
From: Christian Marangi <ansuelsmth@...il.com>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	Miquel Raynal <miquel.raynal@...tlin.com>,
	Richard Weinberger <richard@....at>,
	Vignesh Raghavendra <vigneshr@...com>,
	Md Sadre Alam <quic_mdalam@...cinc.com>,
	Sricharan Ramabadhran <quic_srichara@...cinc.com>,
	linux-mtd@...ts.infradead.org,
	linux-arm-msm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Christian Marangi <ansuelsmth@...il.com>,
	stable@...r.kernel.org
Subject: [PATCH v2 1/2] mtd: rawnand: qcom: Fix broken erase in misc_cmd_type in exec_op

misc_cmd_type in exec_op have multiple problems. With commit a82990c8a409
("mtd: rawnand: qcom: Add read/read_start ops in exec_op path") it was
reworked and generalized but actually broke the handling of the
ERASE_BLOCK command.

Additional logic was added to the erase command cycle without clear
explaination causing the erase command to be broken on testing it on
a ipq806x nandc.

Fix the erase command by reverting the additional logic and only adding
the NAND_DEV0_CFG0 additional call (required for erase command).

Fixes: a82990c8a409 ("mtd: rawnand: qcom: Add read/read_start ops in exec_op path")
Cc: stable@...r.kernel.org
Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
---
Changes v2:
- Split this and rework commit description and title

 drivers/mtd/nand/raw/qcom_nandc.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/mtd/nand/raw/qcom_nandc.c b/drivers/mtd/nand/raw/qcom_nandc.c
index b079605c84d3..19d76e345a49 100644
--- a/drivers/mtd/nand/raw/qcom_nandc.c
+++ b/drivers/mtd/nand/raw/qcom_nandc.c
@@ -2830,9 +2830,8 @@ static int qcom_misc_cmd_type_exec(struct nand_chip *chip, const struct nand_sub
 	nandc_set_reg(chip, NAND_EXEC_CMD, 1);
 
 	write_reg_dma(nandc, NAND_FLASH_CMD, instrs, NAND_BAM_NEXT_SGL);
-	(q_op.cmd_reg == OP_BLOCK_ERASE) ? write_reg_dma(nandc, NAND_DEV0_CFG0,
-	2, NAND_BAM_NEXT_SGL) : read_reg_dma(nandc,
-	NAND_FLASH_STATUS, 1, NAND_BAM_NEXT_SGL);
+	if (q_op.cmd_reg == OP_BLOCK_ERASE)
+		write_reg_dma(nandc, NAND_DEV0_CFG0, 2, NAND_BAM_NEXT_SGL);
 
 	write_reg_dma(nandc, NAND_EXEC_CMD, 1, NAND_BAM_NEXT_SGL);
 	read_reg_dma(nandc, NAND_FLASH_STATUS, 1, NAND_BAM_NEXT_SGL);
-- 
2.43.0