From: Felix Fietkau <nbd@nbd.name>
Date: Wed, 11 Jan 2017 09:42:04 +0000 (+0100)
Subject: ar71xx: fix RB4xx CPLD SPI device mode setup
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=889272d92db689fd9c910243635e44c9d8323095;p=openwrt%2Fstaging%2Fluka.git

ar71xx: fix RB4xx CPLD SPI device mode setup

Commit af79fdbe4af3 changed the code to use tx_nbits for dual SPI tx
transfers, however the SPI stack only allows this when the device mode
includes the relevant bit as well

Signed-off-by: Felix Fietkau <nbd@nbd.name>
---

diff --git a/target/linux/ar71xx/files/drivers/spi/spi-rb4xx-cpld.c b/target/linux/ar71xx/files/drivers/spi/spi-rb4xx-cpld.c
index f6ec350525..0534c7c374 100644
--- a/target/linux/ar71xx/files/drivers/spi/spi-rb4xx-cpld.c
+++ b/target/linux/ar71xx/files/drivers/spi/spi-rb4xx-cpld.c
@@ -279,7 +279,7 @@ static int rb4xx_cpld_probe(struct spi_device *spi)
 	cpld->spi = spi_dev_get(spi);
 	dev_set_drvdata(&spi->dev, cpld);
 
-	spi->mode = SPI_MODE_0;
+	spi->mode = SPI_MODE_0 | SPI_TX_DUAL;
 	spi->bits_per_word = 8;
 	err = spi_setup(spi);
 	if (err) {