mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-20 22:23:27 +00:00
37 lines
1019 B
Diff
37 lines
1019 B
Diff
From: Felix Fietkau <nbd@nbd.name>
|
|
Date: Fri, 23 Feb 2018 17:12:16 +0100
|
|
Subject: [PATCH] mtd: m25p80: allow fallback from spi_flash_read to regular
|
|
SPI transfer
|
|
|
|
Some flash controllers, e.g. on the ath79 platform can support a fast
|
|
flash read via memory mapping, but only if the flash chip is in
|
|
3-byte address mode.
|
|
|
|
Since spi_flash_read_supported does not have access to the same data as
|
|
spi_flash_read, the driver can't detect an unsupported call until m25p80
|
|
has decided to use spi_flash_read.
|
|
|
|
Allow the driver to indicate a fallback to a regular SPI transfer by
|
|
returning -EOPNOTSUPP
|
|
|
|
Signed-off-by: Felix Fietkau <nbd@nbd.name>
|
|
---
|
|
|
|
--- a/drivers/mtd/devices/m25p80.c
|
|
+++ b/drivers/mtd/devices/m25p80.c
|
|
@@ -170,9 +170,11 @@ static ssize_t m25p80_read(struct spi_no
|
|
msg.data_nbits = data_nbits;
|
|
|
|
ret = spi_flash_read(spi, &msg);
|
|
- if (ret < 0)
|
|
- return ret;
|
|
- return msg.retlen;
|
|
+ if (ret != -EOPNOTSUPP) {
|
|
+ if (ret < 0)
|
|
+ return ret;
|
|
+ return msg.retlen;
|
|
+ }
|
|
}
|
|
|
|
spi_message_init(&m);
|