[PATCH 5/8] spi: sirf: add fifo reset/start for cmd transfer

[Barry Song]

From: Qipan Li <Qipan.Li at csr.com>

for command mode spi transfer, HW spec requires to do fifo reset work to
clear FIFO status.

Signed-off-by: Qipan Li <Qipan.Li at csr.com>
Signed-off-by: Barry Song <Baohua.Song at csr.com>
---
 drivers/spi/spi-sirf.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/spi/spi-sirf.c b/drivers/spi/spi-sirf.c
index 93376a2..7499076 100644
--- a/drivers/spi/spi-sirf.c
+++ b/drivers/spi/spi-sirf.c
@@ -311,6 +311,8 @@ static void spi_sirfsoc_cmd_transfer(struct spi_device *spi,
 	u32 cmd;
 
 	sspi = spi_master_get_devdata(spi->master);
+	writel(SIRFSOC_SPI_FIFO_RESET, sspi->base + SIRFSOC_SPI_TXFIFO_OP);
+	writel(SIRFSOC_SPI_FIFO_START, sspi->base + SIRFSOC_SPI_TXFIFO_OP);
 	memcpy(&cmd, sspi->tx, t->len);
 	if (sspi->word_width == 1 && !(spi->mode & SPI_LSB_FIRST))
 		cmd = cpu_to_be32(cmd) >>
-- 
2.1.0



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