31 lines
1 KiB
Diff
31 lines
1 KiB
Diff
From c7c943b1e3813ff5764ee6417a14530cb7cd6f57 Mon Sep 17 00:00:00 2001
|
|
From: Gabor Juhos <juhosg@openwrt.org>
|
|
Date: Thu, 27 Dec 2012 10:42:25 +0100
|
|
Subject: [PATCH] spi/ath79: add missing HIGH->LOW SCK transition
|
|
|
|
commit 72611db0eef21f4456d79ba302af4b34ea384f30 upstream.
|
|
|
|
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>
|
|
---
|
|
drivers/spi/spi-ath79.c | 2 ++
|
|
1 file changed, 2 insertions(+)
|
|
|
|
--- a/drivers/spi/spi-ath79.c
|
|
+++ b/drivers/spi/spi-ath79.c
|
|
@@ -200,6 +200,8 @@ static u32 ath79_spi_txrx_mode0(struct s
|
|
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;
|
|
}
|