From df4e813b72bf07d9026b00455f5e7dffd694ae48 Mon Sep 17 00:00:00 2001
From: Stefan Roese <sr@denx.de>
Date: Mon, 25 Oct 2010 18:31:29 +0200
Subject: [PATCH] cfi_flash: Fix problems with status/id read mode
This patch adds some calls to set the flash chip in the read-status-
register- or read-id-mode before the corresponding register is
read back. This problem was detected while porting the common CFI
driver to support the Xilinx DS617 flash chips.
Signed-off-by: Stefan Roese <sr@denx.de>
---
drivers/mtd/cfi_flash.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/drivers/mtd/cfi_flash.c b/drivers/mtd/cfi_flash.c
index 39c235ebc26..643cd877314 100644
--- a/drivers/mtd/cfi_flash.c
+++ b/drivers/mtd/cfi_flash.c
@@ -1426,6 +1426,11 @@ int flash_real_protect (flash_info_t * info, long sector, int prot)
#endif
};
+ /*
+ * Flash needs to be in status register read mode for
+ * flash_full_status_check() to work correctly
+ */
+ flash_write_cmd(info, sector, 0, FLASH_CMD_READ_STATUS);
if ((retcode =
flash_full_status_check (info, sector, info->erase_blk_tout,
prot ? "protect" : "unprotect")) == 0) {
@@ -1975,6 +1980,13 @@ ulong flash_get_size (phys_addr_t base, int banknum)
case CFI_CMDSET_INTEL_PROG_REGIONS:
case CFI_CMDSET_INTEL_EXTENDED:
case CFI_CMDSET_INTEL_STANDARD:
+ /*
+ * Set flash to read-id mode. Otherwise
+ * reading protected status is not
+ * guaranteed.
+ */
+ flash_write_cmd(info, sect_cnt, 0,
+ FLASH_CMD_READ_ID);
info->protect[sect_cnt] =
flash_isset (info, sect_cnt,
FLASH_OFFSET_PROTECT,
--
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