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

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commit a8d4e01637 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>
This commit is contained in:
Ludovic Desroches
2015-04-16 16:58:12 +02:00
committed by Greg Kroah-Hartman
parent bc9b5647bb
commit 8aff8de536
1 changed files with 2 additions and 0 deletions
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2
drivers/tty/serial/atmel_serial.c
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@@ -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);