From 6652ef88c4a7036e8f5e900f47a4daf2a9ba30c8 Mon Sep 17 00:00:00 2001 From: Masahiro Yamada Date: Thu, 23 Mar 2017 05:07:23 +0900 Subject: [PATCH] mtd: nand: denali: remove meaningless writes to read-only registers The write accesses to LOGICAL_PAGE_{DATA,SPARE}_SIZE have no effect because the Denali User's Guide says these registers are read-only. The hardware automatically multiplies the main/spare size by the number of devices and update LOGICAL_PAGE_{DATA,SPARE}_SIZE. Signed-off-by: Masahiro Yamada Signed-off-by: Boris Brezillon --- drivers/mtd/nand/denali.c | 16 ---------------- 1 file changed, 16 deletions(-) diff --git a/drivers/mtd/nand/denali.c b/drivers/mtd/nand/denali.c index b442a3ed9f0f..1a2e0638affc 100644 --- a/drivers/mtd/nand/denali.c +++ b/drivers/mtd/nand/denali.c @@ -342,8 +342,6 @@ static void get_samsung_nand_para(struct denali_nand_info *denali, static void get_toshiba_nand_para(struct denali_nand_info *denali) { - uint32_t tmp; - /* * Workaround to fix a controller bug which reports a wrong * spare area size for some kind of Toshiba NAND device @@ -351,10 +349,6 @@ static void get_toshiba_nand_para(struct denali_nand_info *denali) if ((ioread32(denali->flash_reg + DEVICE_MAIN_AREA_SIZE) == 4096) && (ioread32(denali->flash_reg + DEVICE_SPARE_AREA_SIZE) == 64)) { iowrite32(216, denali->flash_reg + DEVICE_SPARE_AREA_SIZE); - tmp = ioread32(denali->flash_reg + DEVICES_CONNECTED) * - ioread32(denali->flash_reg + DEVICE_SPARE_AREA_SIZE); - iowrite32(tmp, - denali->flash_reg + LOGICAL_PAGE_SPARE_SIZE); #if SUPPORT_15BITECC iowrite32(15, denali->flash_reg + ECC_CORRECTION); #elif SUPPORT_8BITECC @@ -366,22 +360,12 @@ static void get_toshiba_nand_para(struct denali_nand_info *denali) static void get_hynix_nand_para(struct denali_nand_info *denali, uint8_t device_id) { - uint32_t main_size, spare_size; - switch (device_id) { case 0xD5: /* Hynix H27UAG8T2A, H27UBG8U5A or H27UCG8VFA */ case 0xD7: /* Hynix H27UDG8VEM, H27UCG8UDM or H27UCG8V5A */ iowrite32(128, denali->flash_reg + PAGES_PER_BLOCK); iowrite32(4096, denali->flash_reg + DEVICE_MAIN_AREA_SIZE); iowrite32(224, denali->flash_reg + DEVICE_SPARE_AREA_SIZE); - main_size = 4096 * - ioread32(denali->flash_reg + DEVICES_CONNECTED); - spare_size = 224 * - ioread32(denali->flash_reg + DEVICES_CONNECTED); - iowrite32(main_size, - denali->flash_reg + LOGICAL_PAGE_DATA_SIZE); - iowrite32(spare_size, - denali->flash_reg + LOGICAL_PAGE_SPARE_SIZE); iowrite32(0, denali->flash_reg + DEVICE_WIDTH); #if SUPPORT_15BITECC iowrite32(15, denali->flash_reg + ECC_CORRECTION); -- 2.20.1