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authorFelix Fietkau <nbd@nbd.name>2016-12-30 14:57:22 +0100
committerFelix Fietkau <nbd@nbd.name>2017-01-05 11:09:13 +0100
commit5f9e36712799e7737695384e3c82278af3ddf368 (patch)
tree63b3b10199cfc7940fd4f2a0ed7777245e17607e /target/linux
parentaf79fdbe4af32a287798b579141204bda056b8aa (diff)
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kernel: spi: allow setting chipselect gpio to sleep
Fixes issues on some ar71xx MikroTik RouterBoard devices Signed-off-by: Felix Fietkau <nbd@nbd.name>
Diffstat (limited to 'target/linux')
-rw-r--r--target/linux/generic/patches-4.4/106-spi-use-gpio_set_value_cansleep-for-setting-chipsele.patch21
1 files changed, 21 insertions, 0 deletions
diff --git a/target/linux/generic/patches-4.4/106-spi-use-gpio_set_value_cansleep-for-setting-chipsele.patch b/target/linux/generic/patches-4.4/106-spi-use-gpio_set_value_cansleep-for-setting-chipsele.patch
new file mode 100644
index 0000000000..57c9475359
--- /dev/null
+++ b/target/linux/generic/patches-4.4/106-spi-use-gpio_set_value_cansleep-for-setting-chipsele.patch
@@ -0,0 +1,21 @@
+From: Felix Fietkau <nbd@nbd.name>
+Date: Fri, 30 Dec 2016 14:53:45 +0100
+Subject: [PATCH] spi: use gpio_set_value_cansleep for setting chipselect GPIO
+
+Sleeping is safe inside spi_transfer_one_message, and some GPIO chips
+need to sleep for setting values
+
+Signed-off-by: Felix Fietkau <nbd@nbd.name>
+---
+
+--- a/drivers/spi/spi.c
++++ b/drivers/spi/spi.c
+@@ -674,7 +674,7 @@ static void spi_set_cs(struct spi_device
+ enable = !enable;
+
+ if (gpio_is_valid(spi->cs_gpio))
+- gpio_set_value(spi->cs_gpio, !enable);
++ gpio_set_value_cansleep(spi->cs_gpio, !enable);
+ else if (spi->master->set_cs)
+ spi->master->set_cs(spi, !enable);
+ }