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kernel: spi: allow setting chipselect gpio to sleep

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Fixes issues on some ar71xx MikroTik RouterBoard devices

Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau 2016-12-30 14:57:22 +01:00
parent af79fdbe4a
commit 5f9e367127
1 changed files with 21 additions and 0 deletions
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21
target/linux/generic/patches-4.4/106-spi-use-gpio_set_value_cansleep-for-setting-chipsele.patch Normal file
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@ -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);
}