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AT91/AVR32: atmel_spi.c: flush RDR before next SPI transaction

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Signed-off-by: Reinhard Meyer <u-boot@emk-elektronik.de>
This commit is contained in:
Reinhard Meyer 2010-08-09 13:37:59 +02:00
parent e0cd44c3c1
commit f09d3b2896
1 changed files with 11 additions and 2 deletions
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13
drivers/spi/atmel_spi.c
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@ -43,7 +43,7 @@ struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
u32 csrx; u32 csrx;
void *regs; void *regs;
if (cs > 3 || !spi_cs_is_valid(bus, cs)) if (!spi_cs_is_valid(bus, cs))
return NULL; return NULL;
switch (bus) { switch (bus) {
@ -168,8 +168,17 @@ int spi_xfer(struct spi_slave *slave, unsigned int bitlen,
* somewhat quirky, and it doesn't really buy us much anyway * somewhat quirky, and it doesn't really buy us much anyway
* in the context of U-Boot. * in the context of U-Boot.
*/ */
if (flags & SPI_XFER_BEGIN) if (flags & SPI_XFER_BEGIN) {
spi_cs_activate(slave); spi_cs_activate(slave);
/*
* sometimes the RDR is not empty when we get here,
* in theory that should not happen, but it DOES happen.
* Read it here to be on the safe side.
* That also clears the OVRES flag. Required if the
* following loop exits due to OVRES!
*/
spi_readl(as, RDR);
}
for (len_tx = 0, len_rx = 0; len_rx < len; ) { for (len_tx = 0, len_rx = 0; len_rx < len; ) {
status = spi_readl(as, SR); status = spi_readl(as, SR);