This is a note to let you know that I've just added the patch titled
tty/serial: at91: maxburst was missing for dma transfers
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
tty-serial-at91-maxburst-was-missing-for-dma-transfers.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From a8d4e01637902311c5643b69a5c80e2805f04054 Mon Sep 17 00:00:00 2001
From: Ludovic Desroches <[email protected]>
Date: Thu, 16 Apr 2015 16:58:12 +0200
Subject: tty/serial: at91: maxburst was missing for dma transfers
From: Ludovic Desroches <[email protected]>
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 <[email protected]>
Acked-by: Nicolas Ferre <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
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,
Patches currently in stable-queue which might be from
[email protected] are
queue-3.14/tty-serial-at91-maxburst-was-missing-for-dma-transfers.patch
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