[PATCH v3 11/12] mtd: spinand: micron: Fix read failure in Micron M70A flashes

Shivamurthy Shastri (sshivamurthy) sshivamurthy at micron.com
Mon Jun 3 05:43:42 PDT 2019


M70A series flashes by default enable continuous read feature (BIT0 in
configuration register). This feature will not expose the ECC to host
and causing read failure.

Signed-off-by: Shivamurthy Shastri <sshivamurthy at micron.com>
---
 drivers/mtd/nand/spi/micron.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/mtd/nand/spi/micron.c b/drivers/mtd/nand/spi/micron.c
index 6fde93ec23a1..1e28ea3d1362 100644
--- a/drivers/mtd/nand/spi/micron.c
+++ b/drivers/mtd/nand/spi/micron.c
@@ -127,6 +127,15 @@ static int micron_spinand_detect(struct spinand_device *spinand)
 	return 1;
 }
 
+static int micron_spinand_init(struct spinand_device *spinand)
+{
+	/*
+	 * Some of the Micron flashes enable this BIT by default,
+	 * and there is a chance of read failure due to this.
+	 */
+	return spinand_upd_cfg(spinand, CFG_QUAD_ENABLE, 0);
+}
+
 static void micron_fixup_param_page(struct spinand_device *spinand,
 				    struct nand_onfi_params *p)
 {
@@ -150,6 +159,7 @@ static void micron_fixup_param_page(struct spinand_device *spinand,
 
 static const struct spinand_manufacturer_ops micron_spinand_manuf_ops = {
 	.detect = micron_spinand_detect,
+	.init = micron_spinand_init,
 	.fixup_param_page = micron_fixup_param_page,
 };
 
-- 
2.17.1




More information about the linux-mtd mailing list