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authorKyoungil Kim <ki0351.kim@samsung.com>2012-05-23 16:29:51 +0400
committerGrant Likely <grant.likely@secretlab.ca>2012-12-15 04:49:34 +0400
commit7d859ff4937a22aabc0d3f352d1f515fb8b38528 (patch)
tree7786b4b67765ba0dbd62527013d15024e7aad451 /drivers/spi
parent6f38010d54a9dfd4b9c9e49a7184f84cc2281605 (diff)
downloadlinux-7d859ff4937a22aabc0d3f352d1f515fb8b38528.tar.xz
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>
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/spi-s3c64xx.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
index 88c3f5e51c36..ad93231a8038 100644
--- 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)