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spi: atmel: add WDRBT bit to avoid receive overrun

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The atmel at91sam9x5 series spi has feature to avoid receive overren

Using the patch to enable it

Signed-off-by: Bo Shen <voice.shen@atmel.com>
Acked-by: Andreas Bießmann <andreas.devel@googlemail.com>
Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>
This commit is contained in:
Bo Shen 2012-08-19 20:32:22 +00:00 committed by Albert ARIBAUD
parent 9bfc236872
commit 65c575506d
2 changed files with 4 additions and 0 deletions
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3
drivers/spi/atmel_spi.c
View File

@ -92,6 +92,9 @@ struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
as->slave.cs = cs;
as->regs = regs;
as->mr = ATMEL_SPI_MR_MSTR | ATMEL_SPI_MR_MODFDIS
#if defined(CONFIG_AT91SAM9X5)
| ATMEL_SPI_MR_WDRBT
#endif
| ATMEL_SPI_MR_PCS(~(1 << cs) & 0xf);
spi_writel(as, CSR(cs), csrx);

1
drivers/spi/atmel_spi.h
View File

@ -26,6 +26,7 @@
#define ATMEL_SPI_MR_PCSDEC (1 << 2)
#define ATMEL_SPI_MR_FDIV (1 << 3)
#define ATMEL_SPI_MR_MODFDIS (1 << 4)
#define ATMEL_SPI_MR_WDRBT (1 << 5)
#define ATMEL_SPI_MR_LLB (1 << 7)
#define ATMEL_SPI_MR_PCS(x) (((x) & 15) << 16)
#define ATMEL_SPI_MR_DLYBCS(x) ((x) << 24)