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>
diff --git a/drivers/mtd/cfi_flash.c b/drivers/mtd/cfi_flash.c
index 39c235e..643cd87 100644
--- a/drivers/mtd/cfi_flash.c
+++ b/drivers/mtd/cfi_flash.c
@@ -1426,6 +1426,11 @@
#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 @@
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,