linux-kernel - [RFC PATCH 02/10] mtd: nand: omap: Always use chip->ecc.steps for BCH sector count

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Date:	Wed, 9 Jul 2014 15:37:22 +0300
From:	Roger Quadros <rogerq@...com>
To:	<tony@...mide.com>, <computersforpeace@...il.com>
CC:	<javier@...hile0.org>, <pekon@...com>,
	<ezequiel.garcia@...e-electrons.com>, <dwmw2@...radead.org>,
	<jg1.han@...sung.com>, <nsekhar@...com>,
	<linux-mtd@...ts.infradead.org>, <linux-omap@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Roger Quadros <rogerq@...com>
Subject: [RFC PATCH 02/10] mtd: nand: omap: Always use chip->ecc.steps for BCH sector count

Instead of hardcoding use the pre-calculated chip->ecc.steps for
configuring number of sectors to process with the BCH algorithm.

This also avoids unnecessary access to the ECC_CONFIG register in
omap_calculate_ecc_bch().

Signed-off-by: Roger Quadros <rogerq@...com>
---
 drivers/mtd/nand/omap2.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index 5b8739c..6f3d7cd 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -1066,10 +1066,10 @@ static void __maybe_unused omap_enable_hwecc_bch(struct mtd_info *mtd, int mode)
 	unsigned int ecc_size1, ecc_size0;
 
 	/* GPMC configurations for calculating ECC */
+	nsectors = chip->ecc.steps;
 	switch (ecc_opt) {
 	case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
 		bch_type = 0;
-		nsectors = 1;
 		if (mode == NAND_ECC_READ) {
 			wr_mode	  = BCH_WRAPMODE_6;
 			ecc_size0 = BCH_ECC_SIZE0;
@@ -1082,7 +1082,6 @@ static void __maybe_unused omap_enable_hwecc_bch(struct mtd_info *mtd, int mode)
 		break;
 	case OMAP_ECC_BCH4_CODE_HW:
 		bch_type = 0;
-		nsectors = chip->ecc.steps;
 		if (mode == NAND_ECC_READ) {
 			wr_mode	  = BCH_WRAPMODE_1;
 			ecc_size0 = BCH4R_ECC_SIZE0;
@@ -1095,7 +1094,6 @@ static void __maybe_unused omap_enable_hwecc_bch(struct mtd_info *mtd, int mode)
 		break;
 	case OMAP_ECC_BCH8_CODE_HW_DETECTION_SW:
 		bch_type = 1;
-		nsectors = 1;
 		if (mode == NAND_ECC_READ) {
 			wr_mode	  = BCH_WRAPMODE_6;
 			ecc_size0 = BCH_ECC_SIZE0;
@@ -1108,7 +1106,6 @@ static void __maybe_unused omap_enable_hwecc_bch(struct mtd_info *mtd, int mode)
 		break;
 	case OMAP_ECC_BCH8_CODE_HW:
 		bch_type = 1;
-		nsectors = chip->ecc.steps;
 		if (mode == NAND_ECC_READ) {
 			wr_mode	  = BCH_WRAPMODE_1;
 			ecc_size0 = BCH8R_ECC_SIZE0;
@@ -1121,7 +1118,6 @@ static void __maybe_unused omap_enable_hwecc_bch(struct mtd_info *mtd, int mode)
 		break;
 	case OMAP_ECC_BCH16_CODE_HW:
 		bch_type = 0x2;
-		nsectors = chip->ecc.steps;
 		if (mode == NAND_ECC_READ) {
 			wr_mode	  = 0x01;
 			ecc_size0 = 52; /* ECC bits in nibbles per sector */
@@ -1176,6 +1172,7 @@ static int __maybe_unused omap_calculate_ecc_bch(struct mtd_info *mtd,
 {
 	struct omap_nand_info *info = container_of(mtd, struct omap_nand_info,
 						   mtd);
+	struct nand_chip *chip = mtd->priv;
 	int eccbytes	= info->nand.ecc.bytes;
 	struct gpmc_nand_regs	*gpmc_regs = &info->reg;
 	u8 *ecc_code;
@@ -1183,7 +1180,7 @@ static int __maybe_unused omap_calculate_ecc_bch(struct mtd_info *mtd,
 	u32 val;
 	int i, j;
 
-	nsectors = ((readl(info->reg.gpmc_ecc_config) >> 4) & 0x7) + 1;
+	nsectors = chip->ecc.steps;
 	for (i = 0; i < nsectors; i++) {
 		ecc_code = ecc_calc;
 		switch (info->ecc_opt) {
-- 
1.8.3.2

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