From: Cliff Cai cliff.cai@analog.com
Some SPI devices like to see high idle values rather than low.
Signed-off-by: Cliff Cai cliff.cai@analog.com Signed-off-by: Mike Frysinger vapier@gentoo.org --- drivers/spi/bfin_spi.c | 6 +++++- 1 files changed, 5 insertions(+), 1 deletions(-)
diff --git a/drivers/spi/bfin_spi.c b/drivers/spi/bfin_spi.c index 2a72f99..093166e 100644 --- a/drivers/spi/bfin_spi.c +++ b/drivers/spi/bfin_spi.c @@ -314,6 +314,10 @@ void spi_release_bus(struct spi_slave *slave) SSYNC(); }
+#ifndef CONFIG_BFIN_SPI_IDLE_VAL +# define CONFIG_BFIN_SPI_IDLE_VAL 0xff +#endif + int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout, void *din, unsigned long flags) { @@ -340,7 +344,7 @@ int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
/* todo: take advantage of hardware fifos and setup RX dma */ while (bytes--) { - u8 value = (tx ? *tx++ : 0); + u8 value = (tx ? *tx++ : CONFIG_BFIN_SPI_IDLE_VAL); debug("%s: tx:%x ", __func__, value); write_SPI_TDBR(bss, value); SSYNC();