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Commit 4a589486 authored by Guillaume LECERF's avatar Guillaume LECERF Committed by David Woodhouse
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mtd: add support for switching old SST chips into QRY mode 



SST 39VF160x/39VF320x and some old SST chips need a special command
sequence to enter CFI QueRY mode [1].
This patch adds the relevant sequence to cfi_qry_mode_on().
Tested with 39VF3201.

Signed-off-by: default avatarGuillaume LECERF <glecerf@gmail.com>
Signed-off-by: default avatarDavid Woodhouse <David.Woodhouse@intel.com>
parent db5432db

drivers/mtd/chips/cfi_util.c

+7 −0
Original line number Diff line number Diff line
@@ -69,6 +69,13 @@ int __xipram cfi_qry_mode_on(uint32_t base, struct map_info *map, 
	/* ST M29DW chips */

	cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);

	cfi_send_gen_cmd(0x98, 0x555, base, map, cfi, cfi->device_type, NULL);

	if (cfi_qry_present(map, base, cfi))

		return 1;

	/* some old SST chips, e.g. 39VF160x/39VF320x */

	cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);

	cfi_send_gen_cmd(0xAA, 0x5555, base, map, cfi, cfi->device_type, NULL);

	cfi_send_gen_cmd(0x55, 0x2AAA, base, map, cfi, cfi->device_type, NULL);

	cfi_send_gen_cmd(0x98, 0x5555, base, map, cfi, cfi->device_type, NULL);

	if (cfi_qry_present(map, base, cfi))

		return 1;

	/* QRY not found */