spi: Change FIFO flush operation and spi channel off

Setting SW_RST does TX/RX FIFO flush.
After FIFO flush, SW_RST should be cleared.
The above setting and clearing SW_RST operation should be done after spi channel off.

Signed-off-by: Kyoungil Kim <ki0351.kim@samsung.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
index 88c3f5e..ad93231 100644 (file)
--- a/drivers/spi/spi-s3c64xx.c
+++ b/drivers/spi/spi-s3c64xx.c
@@ -215,6 +215,10 @@ static void flush_fifo(struct s3c64xx_spi_driver_data *sdd)
        writel(0, regs + S3C64XX_SPI_PACKET_CNT);
 
        val = readl(regs + S3C64XX_SPI_CH_CFG);
+       val &= ~(S3C64XX_SPI_CH_RXCH_ON | S3C64XX_SPI_CH_TXCH_ON);
+       writel(val, regs + S3C64XX_SPI_CH_CFG);
+
+       val = readl(regs + S3C64XX_SPI_CH_CFG);
        val |= S3C64XX_SPI_CH_SW_RST;
        val &= ~S3C64XX_SPI_CH_HS_EN;
        writel(val, regs + S3C64XX_SPI_CH_CFG);
@@ -248,10 +252,6 @@ static void flush_fifo(struct s3c64xx_spi_driver_data *sdd)
        val = readl(regs + S3C64XX_SPI_MODE_CFG);
        val &= ~(S3C64XX_SPI_MODE_TXDMA_ON | S3C64XX_SPI_MODE_RXDMA_ON);
        writel(val, regs + S3C64XX_SPI_MODE_CFG);
-
-       val = readl(regs + S3C64XX_SPI_CH_CFG);
-       val &= ~(S3C64XX_SPI_CH_RXCH_ON | S3C64XX_SPI_CH_TXCH_ON);
-       writel(val, regs + S3C64XX_SPI_CH_CFG);
 }
 
 static void s3c64xx_spi_dmacb(void *data)