Linux-mtd Archive on lore.kernel.org
 help / color / Atom feed
* [RESEND PATCH v2] mtd: spi-nor: Fix address width on flash chips > 16MB
@ 2020-10-06 13:23 Bert Vermeulen
  2020-10-06 15:18 ` Pratyush Yadav
                   ` (2 more replies)
  0 siblings, 3 replies; 6+ messages in thread
From: Bert Vermeulen @ 2020-10-06 13:23 UTC (permalink / raw)
  To: tudor.ambarus, miquel.raynal, richard, vigneshr, linux-mtd,
	linux-kernel, stable
  Cc: Bert Vermeulen

If a flash chip has more than 16MB capacity but its BFPT reports
BFPT_DWORD1_ADDRESS_BYTES_3_OR_4, the spi-nor framework defaults to 3.

The check in spi_nor_set_addr_width() doesn't catch it because addr_width
did get set. This fixes that check.

Fixes: f9acd7fa80be ("mtd: spi-nor: sfdp: default to addr_width of 3 for configurable widths")
Signed-off-by: Bert Vermeulen <bert@biot.com>
Reviewed-by: Tudor Ambarus <tudor.ambarus@microchip.com>
---
 drivers/mtd/spi-nor/core.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
index 0369d98b2d12..a2c35ad9645c 100644
--- a/drivers/mtd/spi-nor/core.c
+++ b/drivers/mtd/spi-nor/core.c
@@ -3009,13 +3009,15 @@ static int spi_nor_set_addr_width(struct spi_nor *nor)
 		/* already configured from SFDP */
 	} else if (nor->info->addr_width) {
 		nor->addr_width = nor->info->addr_width;
-	} else if (nor->mtd.size > 0x1000000) {
-		/* enable 4-byte addressing if the device exceeds 16MiB */
-		nor->addr_width = 4;
 	} else {
 		nor->addr_width = 3;
 	}
 
+	if (nor->addr_width == 3 && nor->mtd.size > 0x1000000) {
+		/* enable 4-byte addressing if the device exceeds 16MiB */
+		nor->addr_width = 4;
+	}
+
 	if (nor->addr_width > SPI_NOR_MAX_ADDR_WIDTH) {
 		dev_dbg(nor->dev, "address width is too large: %u\n",
 			nor->addr_width);
-- 
2.17.1


______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/

^ permalink raw reply	[flat|nested] 6+ messages in thread

end of thread, back to index

Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-10-06 13:23 [RESEND PATCH v2] mtd: spi-nor: Fix address width on flash chips > 16MB Bert Vermeulen
2020-10-06 15:18 ` Pratyush Yadav
2020-10-07  7:29   ` Vignesh Raghavendra
2020-10-07  7:48     ` Pratyush Yadav
2020-10-06 15:33 ` Greg KH
2020-10-29  4:46 ` Vignesh Raghavendra

Linux-mtd Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-mtd/0 linux-mtd/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-mtd linux-mtd/ https://lore.kernel.org/linux-mtd \
		linux-mtd@lists.infradead.org
	public-inbox-index linux-mtd

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.infradead.lists.linux-mtd


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git