mtd: nand: denali: remove meaningless writes to read-only registers

[Linux-MTD Mailing List]

Gitweb:     http://git.infradead.org/?p=mtd-2.6.git;a=commit;h=6652ef88c4a7036e8f5e900f47a4daf2a9ba30c8
Commit:     6652ef88c4a7036e8f5e900f47a4daf2a9ba30c8
Parent:     cc5d8031f8c7b11c325a37118f9aa6133f0b28a0
Author:     Masahiro Yamada <yamada.masahiro at socionext.com>
AuthorDate: Thu Mar 23 05:07:23 2017 +0900
Committer:  Boris Brezillon <boris.brezillon at free-electrons.com>
CommitDate: Tue Mar 28 14:24:44 2017 +0200

    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 <yamada.masahiro at socionext.com>
    Signed-off-by: Boris Brezillon <boris.brezillon at free-electrons.com>
---
 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 b442a3e..1a2e063 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);