linux-kernel - [PATCH V2] mtd: rawnand: qcom: avoid writing to obsolete register

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Date:   Mon, 10 May 2021 16:26:46 +0530
From:   Md Sadre Alam <mdalam@...eaurora.org>
To:     miquel.raynal@...tlin.com, mani@...nel.org,
        boris.brezillon@...labora.com, linux-mtd@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Cc:     mdalam@...eaurora.org, sricharan@...eaurora.org
Subject: [PATCH V2] mtd: rawnand: qcom: avoid writing to obsolete register

QPIC_EBI2_ECC_BUF_CFG register got obsolete from QPIC V2.0 onwards.
Avoid writing this register if QPIC version is V2.0 or newer.

Signed-off-by: Md Sadre Alam <mdalam@...eaurora.org>
---
[V2]
 * Updated commit message
 drivers/mtd/nand/raw/qcom_nandc.c | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/mtd/nand/raw/qcom_nandc.c b/drivers/mtd/nand/raw/qcom_nandc.c
index a64fb6c..32f4641 100644
--- a/drivers/mtd/nand/raw/qcom_nandc.c
+++ b/drivers/mtd/nand/raw/qcom_nandc.c
@@ -762,7 +762,8 @@ static void update_rw_regs(struct qcom_nand_host *host, int num_cw, bool read, i
 	nandc_set_reg(chip, NAND_DEV0_CFG0, cfg0);
 	nandc_set_reg(chip, NAND_DEV0_CFG1, cfg1);
 	nandc_set_reg(chip, NAND_DEV0_ECC_CFG, ecc_bch_cfg);
-	nandc_set_reg(chip, NAND_EBI2_ECC_BUF_CFG, host->ecc_buf_cfg);
+	if (!nandc->props->qpic_v2)
+		nandc_set_reg(chip, NAND_EBI2_ECC_BUF_CFG, host->ecc_buf_cfg);
 	nandc_set_reg(chip, NAND_FLASH_STATUS, host->clrflashstatus);
 	nandc_set_reg(chip, NAND_READ_STATUS, host->clrreadstatus);
 	nandc_set_reg(chip, NAND_EXEC_CMD, 1);
@@ -1133,7 +1134,8 @@ static void config_nand_page_read(struct nand_chip *chip)
 
 	write_reg_dma(nandc, NAND_ADDR0, 2, 0);
 	write_reg_dma(nandc, NAND_DEV0_CFG0, 3, 0);
-	write_reg_dma(nandc, NAND_EBI2_ECC_BUF_CFG, 1, 0);
+	if (!nandc->props->qpic_v2)
+		write_reg_dma(nandc, NAND_EBI2_ECC_BUF_CFG, 1, 0);
 	write_reg_dma(nandc, NAND_ERASED_CW_DETECT_CFG, 1, 0);
 	write_reg_dma(nandc, NAND_ERASED_CW_DETECT_CFG, 1,
 		      NAND_ERASED_CW_SET | NAND_BAM_NEXT_SGL);
@@ -1191,8 +1193,9 @@ static void config_nand_page_write(struct nand_chip *chip)
 
 	write_reg_dma(nandc, NAND_ADDR0, 2, 0);
 	write_reg_dma(nandc, NAND_DEV0_CFG0, 3, 0);
-	write_reg_dma(nandc, NAND_EBI2_ECC_BUF_CFG, 1,
-		      NAND_BAM_NEXT_SGL);
+	if (!nandc->props->qpic_v2)
+		write_reg_dma(nandc, NAND_EBI2_ECC_BUF_CFG, 1,
+			      NAND_BAM_NEXT_SGL);
 }
 
 /*
@@ -1248,7 +1251,8 @@ static int nandc_param(struct qcom_nand_host *host)
 					| 2 << WR_RD_BSY_GAP
 					| 0 << WIDE_FLASH
 					| 1 << DEV0_CFG1_ECC_DISABLE);
-	nandc_set_reg(chip, NAND_EBI2_ECC_BUF_CFG, 1 << ECC_CFG_ECC_DISABLE);
+	if (!nandc->props->qpic_v2)
+		nandc_set_reg(chip, NAND_EBI2_ECC_BUF_CFG, 1 << ECC_CFG_ECC_DISABLE);
 
 	/* configure CMD1 and VLD for ONFI param probing in QPIC v1 */
 	if (!nandc->props->qpic_v2) {
@@ -2689,7 +2693,8 @@ static int qcom_nand_attach_chip(struct nand_chip *chip)
 				| ecc_mode << ECC_MODE
 				| host->ecc_bytes_hw << ECC_PARITY_SIZE_BYTES_BCH;
 
-	host->ecc_buf_cfg = 0x203 << NUM_STEPS;
+	if (!nandc->props->qpic_v2)
+		host->ecc_buf_cfg = 0x203 << NUM_STEPS;
 
 	host->clrflashstatus = FS_READY_BSY_N;
 	host->clrreadstatus = 0xc0;
-- 
2.7.4