tty/serial: at91: maxburst was missing for dma transfers

commit a8d4e01637902311c5643b69a5c80e2805f04054 upstream.

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>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index 4e959c4..6afce7e 100644 (file)
--- 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);