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| author | Gabor Juhos <juhosg@openwrt.org> | 2012-12-27 10:42:25 +0100 |
|---|---|---|
| committer | Grant Likely <grant.likely@secretlab.ca> | 2013-02-05 12:57:45 +0000 |
| commit | 72611db0eef21f4456d79ba302af4b34ea384f30 (patch) | |
| tree | b391e700ca1b409bf3b55384d0d105a931c7c730 /drivers/spi | |
| parent | 440114fdb13cbc53ea734bcc05b86bcf5b1e430c (diff) | |
| download | lwn-72611db0eef21f4456d79ba302af4b34ea384f30.tar.gz lwn-72611db0eef21f4456d79ba302af4b34ea384f30.zip | |
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>
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/spi-ath79.c | 2 |
1 files changed, 2 insertions, 0 deletions
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; } |