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authorFelix Fietkau <nbd@nbd.name>2018-02-23 17:33:21 +0100
committerFelix Fietkau <nbd@nbd.name>2018-02-26 19:20:06 +0100
commita49f6565b34c7defbe66cd03c2cb04752ec4dbe6 (patch)
tree5f9c2c58638362ad0408b732c565bd3a3cc8fb21 /target/linux/generic/pending-4.14
parent25aaff9100065dba881be71b9dcab1e9cc8a7b5f (diff)
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kernel: m25p80: allow fallback from spi_flash_read to regular SPI transfer
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Diffstat (limited to 'target/linux/generic/pending-4.14')
-rw-r--r--target/linux/generic/pending-4.14/450-mtd-m25p80-allow-fallback-from-spi_flash_read-to-reg.patch36
1 files changed, 36 insertions, 0 deletions
diff --git a/target/linux/generic/pending-4.14/450-mtd-m25p80-allow-fallback-from-spi_flash_read-to-reg.patch b/target/linux/generic/pending-4.14/450-mtd-m25p80-allow-fallback-from-spi_flash_read-to-reg.patch
new file mode 100644
index 0000000000..accd63df58
--- /dev/null
+++ b/target/linux/generic/pending-4.14/450-mtd-m25p80-allow-fallback-from-spi_flash_read-to-reg.patch
@@ -0,0 +1,36 @@
+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);