bcm53xx: support JEDEC incompatible w25q128 in spi-nor

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>

SVN-Revision: 49259

target/linux/bcm53xx/patches-4.4/405-mtd-spi-nor-detect-JEDEC-incompatible-w25q128-using-.patch

@@ -0,0 +1,34 @@
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
+Subject: [PATCH] mtd: spi-nor: detect JEDEC incompatible w25q128 using 0x90
+ command
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Some w25q128 chipsets don't support RDID (0x9f) command, they reply with
+0xff-s only. To suppose such flashes fallback to the 0x90 command.
+
+Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
+---
+
+--- a/drivers/mtd/spi-nor/spi-nor.c
++++ b/drivers/mtd/spi-nor/spi-nor.c
+@@ -869,6 +869,18 @@ static const struct flash_info *spi_nor_read_id(struct spi_nor *nor)
+ 	}
+ 	dev_err(nor->dev, "unrecognized JEDEC id bytes: %02x, %2x, %2x\n",
+ 		id[0], id[1], id[2]);
++
++	tmp = nor->read_reg(nor, 0x90, id, SPI_NOR_MAX_ID_LEN);
++	if (tmp < 0) {
++		dev_dbg(nor->dev, " error %d reading JEDEC ID\n", tmp);
++		return ERR_PTR(tmp);
++	}
++	dev_info(nor->dev, "using Read Manufacturer / Device ID command (0x%02x) returned %02x %02x\n",
++		 0x90, id[0x03], id[0x04]);
++	if (id[0x03] == 0xef && id[0x04] == 0x17) {
++		return spi_nor_match_id("w25q128");
++	}
++
+ 	return ERR_PTR(-ENODEV);
+ }
+