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mec1322: Disable auto read after a SPI transaction

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The auto mode keeps the read buffer full and thus interfere with the
next transaction. We need to disable it when we are done with the
current transaction.

BUG=chrome-os-partner:29805
TEST=Read from SPI flash multiple times
BRANCH=None

Change-Id: I624299aae29fecde03e41228a694550f1deafd2a
Signed-off-by: Vic Yang <victoryang@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/205799
Reviewed-by: Randall Spangler <rspangler@chromium.org>
This commit is contained in:
Vic Yang
2014-06-26 17:33:03 -07:00
committed by chrome-internal-fetch
parent d7c19b0236
commit f1ddcab82d
1 changed files with 9 additions and 0 deletions
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9
chip/mec1322/spi.c
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@@ -83,9 +83,18 @@ int spi_transaction_async(const uint8_t *txdata, int txlen,
int spi_transaction_flush(void)
{
int ret = dma_wait(SPI_DMA_CHANNEL);
uint8_t dummy __attribute__((unused)) = 0;
/* Disable auto read */
MEC1322_SPI_CR(CONFIG_SPI_PORT) &= ~(1 << 5);
gpio_set_level(CONFIG_SPI_CS_GPIO, 1);
dma_disable(SPI_DMA_CHANNEL);
dma_clear_isr(SPI_DMA_CHANNEL);
if (MEC1322_SPI_SR(CONFIG_SPI_PORT) & 0x2)
dummy = MEC1322_SPI_RD(CONFIG_SPI_PORT);
return ret;
}