32 lines
1.0 KiB
Diff
32 lines
1.0 KiB
Diff
From c7c943b1e3813ff5764ee6417a14530cb7cd6f57 Mon Sep 17 00:00:00 2001
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From: Gabor Juhos <juhosg@openwrt.org>
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Date: Thu, 27 Dec 2012 10:42:25 +0100
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Subject: [PATCH] spi/ath79: add missing HIGH->LOW SCK transition
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commit 72611db0eef21f4456d79ba302af4b34ea384f30 upstream.
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The 'ath79_spi_txrx_mode0' function does not
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set the SCK signal to LOW at the end of a word
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transfer. This causes communications errors with
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certain devices (e.g. the PCF2123 RTC chip).
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The patch ensures that the SCK signal will be LOW.
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Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
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Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
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---
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drivers/spi/spi-ath79.c | 2 ++
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1 file changed, 2 insertions(+)
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--- a/drivers/spi/spi-ath79.c
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+++ b/drivers/spi/spi-ath79.c
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@@ -200,6 +200,8 @@ static u32 ath79_spi_txrx_mode0(struct s
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ath79_spi_delay(sp, nsecs);
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ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, out | AR71XX_SPI_IOC_CLK);
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ath79_spi_delay(sp, nsecs);
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+ if (bits == 1)
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+ ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, out);
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word <<= 1;
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}
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