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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);
}
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