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| author | Louis Yung-Chieh Lo <yjlou@chromium.org> | 2013-11-26 12:21:57 -0800 |
|---|---|---|
| committer | chrome-internal-fetch <chrome-internal-fetch@google.com> | 2014-03-11 05:54:04 +0000 |
| commit | 6258f1f3551b2088beea5f368c0365aaf2a85b21 (patch) | |
| tree | 0c47afd59bd860a664e45bf39d26c02f99874ff5 | |
| parent | 2476ae11fce6cd549dcfe6c39aab7c126c23c234 (diff) | |
| download | chrome-ec-6258f1f3551b2088beea5f368c0365aaf2a85b21.tar.gz | |
stm32: flush write buffer before start DMA transfer.
BUG=chrome-os-partner:22849
TEST=Tested on peach-pit FAFT. No "checksum invalid" from cpu_uart.txt
BRANCH=pit,nyan
Change-Id: I64f4b636943158fab48892020980f784ca551e4f
Signed-off-by: Louis Yung-Chieh Lo <yjlou@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/178087
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
| -rw-r--r-- | chip/stm32/dma.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/chip/stm32/dma.c b/chip/stm32/dma.c index 71fa4e22f1..e648b7418e 100644 --- a/chip/stm32/dma.c +++ b/chip/stm32/dma.c @@ -79,6 +79,9 @@ static void prepare_channel(stm32_dma_chan_t *chan, unsigned count, void dma_go(stm32_dma_chan_t *chan) { + /* Flush data in write buffer so that DMA can get the lastest data */ + asm volatile("dsb;"); + /* Fire it up */ chan->ccr |= STM32_DMA_CCR_EN; } |