Messages in this thread Patch in this message | | | From | Bryan Wu <> | Subject | [PATCH 2/5] Blackfin SPI Driver: add comment about full duplex dma according to David Brownell | Date | Thu, 5 Feb 2009 18:07:30 +0800 |
| |
From: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <cooloney@kernel.org> --- drivers/spi/spi_bfin5xx.c | 7 ++++--- 1 files changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/spi/spi_bfin5xx.c b/drivers/spi/spi_bfin5xx.c index 74c5bb9..ce24d5e 100644 --- a/drivers/spi/spi_bfin5xx.c +++ b/drivers/spi/spi_bfin5xx.c @@ -766,9 +766,10 @@ static void bfin_spi_pump_transfers(unsigned long data) width, transfer->len); /* - * Try to map dma buffer and do a dma transfer if - * successful use different way to r/w according to - * drv_data->cur_chip->enable_dma + * Try to map dma buffer and do a dma transfer. If successful use, + * different way to r/w according to the enable_dma settings and if + * we are not doing a full duplex transfer (since the hardware does + * not support full duplex DMA transfers). */ if (!full_duplex && drv_data->cur_chip->enable_dma && drv_data->len > 6) { -- 1.5.6.3
| |