From 4a58948669702639db7acecfa2105c3172d85c93 Mon Sep 17 00:00:00 2001 From: Guillaume LECERF Date: Mon, 23 Nov 2009 02:10:49 +0100 Subject: [PATCH] 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: Guillaume LECERF Signed-off-by: David Woodhouse --- drivers/mtd/chips/cfi_util.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/mtd/chips/cfi_util.c b/drivers/mtd/chips/cfi_util.c index c5a84fda5410..ca584d0380b4 100755 --- a/drivers/mtd/chips/cfi_util.c +++ b/drivers/mtd/chips/cfi_util.c @@ -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 */ -- 2.20.1