linux-kernel - [PATCH v3] mtd: rawnand: qcom: Fix broken misc_cmd_type in exec

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Date: Tue,  2 Apr 2024 23:41:34 +0200
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>,
	Sricharan Ramabadhran <quic_srichara@...cinc.com>,
	Md Sadre Alam <quic_mdalam@...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 v3] mtd: rawnand: qcom: Fix broken 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 dropped the handling of the
OP_RESET_DEVICE command.

The rework itself was correct with supporting case where a single misc
command is handled, but became problematic by the addition of exiting
early if we didn't had an OP_BLOCK_ERASE or an OP_PROGRAM_PAGE operation.

Also additional logic was added without clear explaination causing the
OP_RESET_DEVICE command to be broken on testing it on a ipq806x nandc.

Add some additional logic to restore OP_RESET_DEVICE command handling
restoring original functionality.

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 v3:
- Merge patches
- Rework commit description
Changes v2:
- Split patches

 drivers/mtd/nand/raw/qcom_nandc.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/mtd/nand/raw/qcom_nandc.c b/drivers/mtd/nand/raw/qcom_nandc.c
index b079605c84d3..b8cff9240b28 100644
--- a/drivers/mtd/nand/raw/qcom_nandc.c
+++ b/drivers/mtd/nand/raw/qcom_nandc.c
@@ -2815,7 +2815,7 @@ static int qcom_misc_cmd_type_exec(struct nand_chip *chip, const struct nand_sub
 			      host->cfg0_raw & ~(7 << CW_PER_PAGE));
 		nandc_set_reg(chip, NAND_DEV0_CFG1, host->cfg1_raw);
 		instrs = 3;
-	} else {
+	} else if (q_op.cmd_reg != OP_RESET_DEVICE) {
 		return 0;
 	}
 
@@ -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