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bfin: discard invalid data and clear RXS in bf5xx spi driver

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There may be dirty data in RDBR, so we should discard invalid data.
This operation also clears RXS bit in STAT register.

Signed-off-by: Scott Jiang <scott.jiang.linux@gmail.com>
Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
This commit is contained in:
Scott Jiang 2011-12-07 14:53:30 -05:00 committed by Sonic Zhang
parent e76276df74
commit d4d4f90377
1 changed files with 2 additions and 0 deletions
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2
drivers/spi/bfin_spi.c
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@ -248,6 +248,8 @@ void spi_release_bus(struct spi_slave *slave)
static int spi_pio_xfer(struct bfin_spi_slave *bss, const u8 *tx, u8 *rx,
uint bytes)
{
/* discard invalid data and clear RXS */
read_SPI_RDBR(bss);
/* todo: take advantage of hardware fifos */
while (bytes--) {
u8 value = (tx ? *tx++ : CONFIG_BFIN_SPI_IDLE_VAL);