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kernel: m25p80: allow fallback from spi_flash_read to regular SPI transfer

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Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau 2018-02-23 17:33:21 +01:00
parent 25aaff9100
commit a49f6565b3
6 changed files with 79 additions and 7 deletions
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4
target/linux/ar71xx/patches-4.9/407-mtd-m25p80-allow-to-pass-probe-types-via-platform-data.patch
View file

@ -1,6 +1,6 @@
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -192,6 +192,7 @@ static ssize_t m25p80_read(struct spi_no
@@ -194,6 +194,7 @@ static ssize_t m25p80_read(struct spi_no
*/
static int m25p_probe(struct spi_device *spi)
{
@ -8,7 +8,7 @@
struct flash_platform_data *data;
struct m25p *flash;
struct spi_nor *nor;
@@ -244,8 +245,11 @@ static int m25p_probe(struct spi_device
@@ -246,8 +247,11 @@ static int m25p_probe(struct spi_device
if (ret)
return ret;

2
target/linux/brcm63xx/patches-4.9/001-4.11-01-mtd-m25p80-consider-max-message-size-in-m25p80_read.patch
View file

@ -18,7 +18,7 @@ Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -172,7 +172,8 @@ static ssize_t m25p80_read(struct spi_no
@@ -174,7 +174,8 @@ static ssize_t m25p80_read(struct spi_no
t[1].rx_buf = buf;
t[1].rx_nbits = m25p80_rx_nbits(nor);

36
target/linux/generic/pending-4.14/450-mtd-m25p80-allow-fallback-from-spi_flash_read-to-reg.patch Normal file
View file

@ -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);

36
target/linux/generic/pending-4.9/450-mtd-m25p80-allow-fallback-from-spi_flash_read-to-reg.patch Normal file
View file

@ -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
@@ -155,9 +155,11 @@ static ssize_t m25p80_read(struct spi_no
msg.data_nbits = m25p80_rx_nbits(nor);
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);

4
target/linux/lantiq/patches-4.14/0022-MTD-m25p80-allow-loading-mtd-name-from-OF.patch
View file

@ -22,7 +22,7 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
@@ -243,6 +244,10 @@ static int m25p_probe(struct spi_device
@@ -245,6 +246,10 @@ static int m25p_probe(struct spi_device
};
char *flash_name;
int ret;
@ -33,7 +33,7 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
data = dev_get_platdata(&spi->dev);
@@ -281,6 +286,8 @@ static int m25p_probe(struct spi_device
@@ -283,6 +288,8 @@ static int m25p_probe(struct spi_device
if (data && data->name)
nor->mtd.name = data->name;

4
target/linux/lantiq/patches-4.9/0022-MTD-m25p80-allow-loading-mtd-name-from-OF.patch
View file

@ -22,7 +22,7 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
@@ -198,6 +199,10 @@ static int m25p_probe(struct spi_device
@@ -200,6 +201,10 @@ static int m25p_probe(struct spi_device
enum read_mode mode = SPI_NOR_NORMAL;
char *flash_name;
int ret;
@ -33,7 +33,7 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
data = dev_get_platdata(&spi->dev);
@@ -227,6 +232,8 @@ static int m25p_probe(struct spi_device
@@ -229,6 +234,8 @@ static int m25p_probe(struct spi_device
if (data && data->name)
nor->mtd.name = data->name;