diff mbox series

[v3,05/12] mtd: spi-nor: default to address width of 3 for configurable widths

Message ID 20200313154645.29293-6-p.yadav@ti.com
State Superseded
Delegated to: Ambarus Tudor
Headers show
Series mtd: spi-nor: add xSPI Octal DTR support | expand

Commit Message

Pratyush Yadav March 13, 2020, 3:46 p.m. UTC 
JESD216D.01 says that when the address width can be 3 or 4, it defaults
to 3 and enters 4-byte mode when given the appropriate command. So, when
we see a configurable width, default to 3 and let flash that default to
4 change it in a post-bfpt fixup.

This fixes SMPT parsing for flashes with configurable address width. If
the SMPT descriptor advertises variable address width, we use
nor->addr_width as the address width. But since it was not set to any
value from the SFDP table, the read command uses an address width of 0,
resulting in an incorrect read being issued.

Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
---
 drivers/mtd/spi-nor/spi-nor.c | 1 +
 1 file changed, 1 insertion(+)
diff mbox series

Patch

diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index 9e0724f2a825..9335692e9bcb 100644
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -3772,6 +3772,7 @@  static int spi_nor_parse_bfpt(struct spi_nor *nor,
 	/* Number of address bytes. */
 	switch (bfpt.dwords[BFPT_DWORD(1)] & BFPT_DWORD1_ADDRESS_BYTES_MASK) {
 	case BFPT_DWORD1_ADDRESS_BYTES_3_ONLY:
+	case BFPT_DWORD1_ADDRESS_BYTES_3_OR_4:
 		nor->addr_width = 3;
 		break;