Commit 5286f7e3 authored Apr 16, 2015 by Ludovic Desroches Committed by Sasha Levin May 17, 2015

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



[ Upstream commit a8d4e01637902311c5643b69a5c80e2805f04054 ]

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>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>

parent ed923770

drivers/tty/serial/atmel_serial.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -861,6 +861,7 @@ 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_device_control(atmel_port->chan_tx,
		DMA_SLAVE_CONFIG,
		@@ -1025,6 +1026,7 @@ 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_device_control(atmel_port->chan_rx,
		DMA_SLAVE_CONFIG,