synquacer_cs_set() function does not wait the chip select is deasserted when the driver sets the DMSTOP to deselect the slave. This commit checks the Slave Select Released(SRS) bit to wait until the slave is deselected.
Signed-off-by: Masahisa Kojima masahisa.kojima@linaro.org Signed-off-by: Satoru Okamoto okamoto.satoru@socionext.com --- drivers/spi/spi-synquacer.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/drivers/spi/spi-synquacer.c b/drivers/spi/spi-synquacer.c index 62f85f0335..f1422cf893 100644 --- a/drivers/spi/spi-synquacer.c +++ b/drivers/spi/spi-synquacer.c @@ -46,7 +46,9 @@ #define RXE 0x24 #define RXC 0x28 #define TFLETE 4 +#define TSSRS 6 #define RFMTE 5 +#define RSSRS 6
#define FAULTF 0x2c #define FAULTC 0x30 @@ -170,6 +172,11 @@ static void synquacer_cs_set(struct synquacer_spi_priv *priv, bool active) priv->rx_words = 16; read_fifo(priv); } + + /* wait until slave is deselected */ + while (!(readl(priv->base + TXF) & BIT(TSSRS)) || + !(readl(priv->base + RXF) & BIT(RSSRS))) + ; } }