a93dfb0d18850776ae490de1df0831270c93100e
[openwrt/openwrt.git] / target / linux / bcm53xx / patches-4.4 / 405-mtd-spi-nor-detect-JEDEC-incompatible-w25q128-using-.patch
1 From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
2 Subject: [PATCH] mtd: spi-nor: detect JEDEC incompatible w25q128 using 0x90
3 command
4 MIME-Version: 1.0
5 Content-Type: text/plain; charset=UTF-8
6 Content-Transfer-Encoding: 8bit
7
8 Some w25q128 chipsets don't support RDID (0x9f) command, they reply with
9 0xff-s only. To suppose such flashes fallback to the 0x90 command.
10
11 Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
12 ---
13
14 --- a/drivers/mtd/spi-nor/spi-nor.c
15 +++ b/drivers/mtd/spi-nor/spi-nor.c
16 @@ -874,6 +874,18 @@ static const struct flash_info *spi_nor_
17 }
18 dev_err(nor->dev, "unrecognized JEDEC id bytes: %02x, %2x, %2x\n",
19 id[0], id[1], id[2]);
20 +
21 + tmp = nor->read_reg(nor, 0x90, id, SPI_NOR_MAX_ID_LEN);
22 + if (tmp < 0) {
23 + dev_dbg(nor->dev, " error %d reading JEDEC ID\n", tmp);
24 + return ERR_PTR(tmp);
25 + }
26 + dev_info(nor->dev, "using Read Manufacturer / Device ID command (0x%02x) returned %02x %02x\n",
27 + 0x90, id[0x03], id[0x04]);
28 + if (id[0x03] == 0xef && id[0x04] == 0x17) {
29 + return spi_nor_match_id("w25q128");
30 + }
31 +
32 return ERR_PTR(-ENODEV);
33 }
34