linux-kernel - [PATCH 3.12 093/142] tty/serial: at91: maxburst was missing for dma transfers

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Message-Id: <7a90b15c3bb64b4d59badac51d5dda9a735087e3.1431761807.git.jslaby@suse.cz>
Date:	Sat, 16 May 2015 09:37:33 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Ludovic Desroches <ludovic.desroches@...el.com>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 093/142] tty/serial: at91: maxburst was missing for dma transfers

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

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

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@...el.com>
Acked-by: Nicolas Ferre <nicolas.ferre@...el.com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/tty/serial/atmel_serial.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index ebdc00f184a1..ab2e22bf54fd 100644
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -756,6 +756,7 @@ 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,
@@ -920,6 +921,7 @@ 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,
-- 
2.3.7

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