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authorLudovic Desroches <ludovic.desroches@atmel.com>2015-04-16 16:58:12 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-04-28 14:27:38 +0200
commita8d4e01637902311c5643b69a5c80e2805f04054 (patch)
tree4b3dc957ec98a3d4b93c7d0474a15c30c6e38d9e
parent6befa9d883385c580369a2cc9e53fbf329771f6d (diff)
tty/serial: at91: maxburst was missing for dma transfers
Maxburst was not set when doing the dma slave configuration. This value is checked by the recently introduced xdmac. It causes an error when doing the slave configuration and so prevents from using dma. Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com> Cc: <stable@vger.kernel.org> # 3.12 and later Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/tty/serial/atmel_serial.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index d58fe4763d9e..27dade29646b 100644
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -880,6 +880,7 @@ static int atmel_prepare_tx_dma(struct uart_port *port)
config.direction = DMA_MEM_TO_DEV;
config.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
config.dst_addr = port->mapbase + ATMEL_US_THR;
+ config.dst_maxburst = 1;
ret = dmaengine_slave_config(atmel_port->chan_tx,
&config);
@@ -1059,6 +1060,7 @@ static int atmel_prepare_rx_dma(struct uart_port *port)
config.direction = DMA_DEV_TO_MEM;
config.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
config.src_addr = port->mapbase + ATMEL_US_RHR;
+ config.src_maxburst = 1;
ret = dmaengine_slave_config(atmel_port->chan_rx,
&config);