spi: spi-qpic-snand: enable 8 bits ECC strength

Merge series from Gabor Juhos <j4g8y7@gmail.com>:

This small patch set adds support for 8 bits ECC strength, which widens
the range of the usable SPI NAND chips with the driver.

The first one is a preparatory patch which adds some defines which
allows to avoid using magic values, and the second patch implements
the actual support.

The series should be integrated via the SPI tree, as that contains
prerequisite changes.

3 files changed, 21 insertions, 8 deletions

diff --git a/drivers/mtd/nand/raw/qcom_nandc.c b/drivers/mtd/nand/raw/qcom_nandc.c
index 1003cf118c01..4dd6f1a4e797 100644
--- a/drivers/mtd/nand/raw/qcom_nandc.c
+++ b/drivers/mtd/nand/raw/qcom_nandc.c
@@ -1379,7 +1379,7 @@ static int qcom_nand_attach_chip(struct nand_chip *chip)
 	struct qcom_nand_controller *nandc = get_qcom_nand_controller(chip);
 	int cwperpage, bad_block_byte, ret;
 	bool wide_bus;
-	int ecc_mode = 1;
+	int ecc_mode = ECC_MODE_8BIT;
 
 	/* controller only supports 512 bytes data steps */
 	ecc->size = NANDC_STEP_SIZE;
@@ -1400,7 +1400,7 @@ static int qcom_nand_attach_chip(struct nand_chip *chip)
 	if (ecc->strength >= 8) {
 		/* 8 bit ECC defaults to BCH ECC on all platforms */
 		host->bch_enabled = true;
-		ecc_mode = 1;
+		ecc_mode = ECC_MODE_8BIT;
 
 		if (wide_bus) {
 			host->ecc_bytes_hw = 14;
@@ -1420,7 +1420,7 @@ static int qcom_nand_attach_chip(struct nand_chip *chip)
 		if (nandc->props->ecc_modes & ECC_BCH_4BIT) {
 			/* BCH */
 			host->bch_enabled = true;
-			ecc_mode = 0;
+			ecc_mode = ECC_MODE_4BIT;
 
 			if (wide_bus) {
 				host->ecc_bytes_hw = 8;
diff --git a/drivers/spi/spi-qpic-snand.c b/drivers/spi/spi-qpic-snand.c
index ca55f9bcd17b..b711c8be42c1 100644
--- a/drivers/spi/spi-qpic-snand.c
+++ b/drivers/spi/spi-qpic-snand.c
@@ -277,9 +277,22 @@ static int qcom_spi_ecc_init_ctx_pipelined(struct nand_device *nand)
 		goto err_free_ecc_cfg;
 	}
 
-	if (ecc_cfg->strength != 4) {
+	switch (ecc_cfg->strength) {
+	case 4:
+		ecc_cfg->ecc_mode = ECC_MODE_4BIT;
+		ecc_cfg->ecc_bytes_hw = 7;
+		ecc_cfg->spare_bytes = 4;
+		break;
+
+	case 8:
+		ecc_cfg->ecc_mode = ECC_MODE_8BIT;
+		ecc_cfg->ecc_bytes_hw = 13;
+		ecc_cfg->spare_bytes = 2;
+		break;
+
+	default:
 		dev_err(snandc->dev,
-			"only 4 bits ECC strength is supported\n");
+			"only 4 or 8 bits ECC strength is supported\n");
 		ret = -EOPNOTSUPP;
 		goto err_free_ecc_cfg;
 	}
@@ -296,8 +309,6 @@ static int qcom_spi_ecc_init_ctx_pipelined(struct nand_device *nand)
 	nand->ecc.ctx.priv = ecc_cfg;
 	snandc->qspi->mtd = mtd;
 
-	ecc_cfg->ecc_bytes_hw = 7;
-	ecc_cfg->spare_bytes = 4;
 	ecc_cfg->bbm_size = 1;
 	ecc_cfg->bch_enabled = true;
 	ecc_cfg->bytes = ecc_cfg->ecc_bytes_hw + ecc_cfg->spare_bytes + ecc_cfg->bbm_size;
@@ -343,7 +354,7 @@ static int qcom_spi_ecc_init_ctx_pipelined(struct nand_device *nand)
 			       FIELD_PREP(ECC_SW_RESET, 0) |
 			       FIELD_PREP(ECC_NUM_DATA_BYTES_MASK, ecc_cfg->cw_data) |
 			       FIELD_PREP(ECC_FORCE_CLK_OPEN, 1) |
-			       FIELD_PREP(ECC_MODE_MASK, 0) |
+			       FIELD_PREP(ECC_MODE_MASK, ecc_cfg->ecc_mode) |
 			       FIELD_PREP(ECC_PARITY_SIZE_BYTES_BCH_MASK, ecc_cfg->ecc_bytes_hw);
 
 	ecc_cfg->ecc_buf_cfg = FIELD_PREP(NUM_STEPS_MASK, 0x203);
diff --git a/include/linux/mtd/nand-qpic-common.h b/include/linux/mtd/nand-qpic-common.h
index e8462deda6db..0d944db363cd 100644
--- a/include/linux/mtd/nand-qpic-common.h
+++ b/include/linux/mtd/nand-qpic-common.h
@@ -101,6 +101,8 @@
 #define	ECC_SW_RESET			BIT(1)
 #define	ECC_MODE			4
 #define	ECC_MODE_MASK			GENMASK(5, 4)
+#define	ECC_MODE_4BIT			0
+#define	ECC_MODE_8BIT			1
 #define	ECC_PARITY_SIZE_BYTES_BCH	8
 #define	ECC_PARITY_SIZE_BYTES_BCH_MASK	GENMASK(12, 8)
 #define	ECC_NUM_DATA_BYTES		16