mtd: nand: omap: ecc.hwctl: clean omap_enable_hwecc_bch for redundant ECC configs

This patch
 - refactors GPMC configurations based on ecc-scheme
 - removed dependency on is_elm_present() flag, which is implicitely
   taken care by selecting appropriate ecc-scheme
Signed-off-by: NPekon Gupta <pekon@ti.com>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

drivers/mtd/nand/omap2.c

@@ -1053,7 +1053,7 @@ static int omap_dev_ready(struct mtd_info *mtd)
  */
 static void __maybe_unused omap_enable_hwecc_bch(struct mtd_info *mtd, int mode)
 {
-	int nerrors;
+	unsigned int bch_type;
 	unsigned int dev_width, nsectors;
 	struct omap_nand_info *info = container_of(mtd, struct omap_nand_info,
 						   mtd);
@@ -1062,20 +1062,11 @@ static void __maybe_unused omap_enable_hwecc_bch(struct mtd_info *mtd, int mode)
 	u32 val, wr_mode;
 	unsigned int ecc_size1, ecc_size0;
 
-	/* Perform ecc calculation on 512-byte sector */
-	nsectors = 1;
-
-	/* Update number of error correction */
-	nerrors = info->nand.ecc.strength;
-
-	/* Multi sector reading/writing for NAND flash with page size < 4096 */
-	if (info->is_elm_used && (mtd->writesize <= 4096)) {
-		/* Perform ecc calculation for one page (< 4096) */
-		nsectors = info->nand.ecc.steps;
-	}
 	/* GPMC configurations for calculating ECC */
 	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;
@@ -1087,6 +1078,8 @@ 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;
@@ -1098,6 +1091,8 @@ 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;
@@ -1109,6 +1104,8 @@ 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;
@@ -1133,7 +1130,7 @@ static void __maybe_unused omap_enable_hwecc_bch(struct mtd_info *mtd, int mode)
 
 	/* BCH configuration */
 	val = ((1                        << 16) | /* enable BCH */
-	       (((nerrors == 8) ? 1 : 0) << 12) | /* 8 or 4 bits */
+	       (bch_type		 << 12) | /* BCH4/BCH8/BCH16 */
 	       (wr_mode                  <<  8) | /* wrap mode */
 	       (dev_width                <<  7) | /* bus width */
 	       (((nsectors-1) & 0x7)     <<  4) | /* number of sectors */