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 @@ -869,6 +869,18 @@ static const struct flash_info *spi_nor_read_id(struct spi_nor *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