From: Gabor Juhos <juhosg@openwrt.org>
Date: Thu, 27 Dec 2012 09:42:25 +0000 (+0100)
Subject: spi/ath79: add missing HIGH->LOW SCK transition
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=72611db0eef21f4456d79ba302af4b34ea384f30;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

spi/ath79: add missing HIGH->LOW SCK transition

The 'ath79_spi_txrx_mode0' function does not
set the SCK signal to LOW at the end of a word
transfer. This causes communications errors with
certain devices (e.g. the PCF2123 RTC chip).

The patch ensures that the SCK signal will be LOW.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
---

diff --git a/drivers/spi/spi-ath79.c b/drivers/spi/spi-ath79.c
index e02528244451..d4b8e1236612 100644
--- a/drivers/spi/spi-ath79.c
+++ b/drivers/spi/spi-ath79.c
@@ -200,6 +200,8 @@ static u32 ath79_spi_txrx_mode0(struct spi_device *spi, unsigned nsecs,
 		ath79_spi_delay(sp, nsecs);
 		ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, out | AR71XX_SPI_IOC_CLK);
 		ath79_spi_delay(sp, nsecs);
+		if (bits == 1)
+			ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, out);
 
 		word <<= 1;
 	}