[PATCH 3.14 10/25] tty/serial: at91: maxburst was missing for dma transfers

Greg Kroah-Hartman
2015-05-11T18:49:34Z

From: Ludovic Desroches <ludovic.desroches@atmel.com>

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>

---
drivers/tty/serial/atmel_serial.c | 2 ++
1 file changed, 2 insertions(+)

--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -757,6 +757,7 @@ static int atmel_prepare_tx_dma(struct u
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_device_control(atmel_port->chan_tx,
DMA_SLAVE_CONFIG,
@@ -921,6 +922,7 @@ static int atmel_prepare_rx_dma(struct u
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_device_control(atmel_port->chan_rx,
DMA_SLAVE_CONFIG,