From: Qipan Li <Qipan.Li@csr.com>
Date: Tue, 2 Sep 2014 09:02:34 +0000 (+0800)
Subject: spi: sirf: add fifo reset/start for cmd transfer
X-Git-Tag: v3.17-rc6~18^2^7
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=810a58b0256b24f194dda5ca1e705204ca703f7b;p=profile%2Fcommon%2Fplatform%2Fkernel%2Flinux-artik7.git

spi: sirf: add fifo reset/start for cmd transfer

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

Signed-off-by: Qipan Li <Qipan.Li@csr.com>
Signed-off-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
---

diff --git a/drivers/spi/spi-sirf.c b/drivers/spi/spi-sirf.c
index 1a51613..6f0602f 100644
--- a/drivers/spi/spi-sirf.c
+++ b/drivers/spi/spi-sirf.c
@@ -312,6 +312,8 @@ static int 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) >>