diff options
Diffstat (limited to 'drivers/spi/atmel_spi.c')
| -rw-r--r-- | drivers/spi/atmel_spi.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/spi/atmel_spi.c b/drivers/spi/atmel_spi.c index ff10808183a3..b09d33678dd8 100644 --- a/drivers/spi/atmel_spi.c +++ b/drivers/spi/atmel_spi.c @@ -490,9 +490,14 @@ static int atmel_spi_setup(struct spi_device *spi) if (!(spi->mode & SPI_CPHA)) csr |= SPI_BIT(NCPHA); - /* TODO: DLYBS and DLYBCT */ - csr |= SPI_BF(DLYBS, 10); - csr |= SPI_BF(DLYBCT, 10); + /* DLYBS is mostly irrelevant since we manage chipselect using GPIOs. + * + * DLYBCT would add delays between words, slowing down transfers. + * It could potentially be useful to cope with DMA bottlenecks, but + * in those cases it's probably best to just use a lower bitrate. + */ + csr |= SPI_BF(DLYBS, 0); + csr |= SPI_BF(DLYBCT, 0); /* chipselect must have been muxed as GPIO (e.g. in board setup) */ npcs_pin = (unsigned int)spi->controller_data; |