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serial: pl011: Allocate TX DMA buffer from DMA capable memory 

Allocating with __GFP_DMA avoids the need for bounce buffers

Signed-off-by: Andrew Jackson <Andrew.Jackson@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
hifive-unleashed-5.1
Andrew Jackson 2014-11-07 14:14:35 +00:00 committed by Greg Kroah-Hartman
parent 144c29ed5f
commit 4c0be45b18
1 changed files with 1 additions and 1 deletions
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2
drivers/tty/serial/amba-pl011.c
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@ -988,7 +988,7 @@ static void pl011_dma_startup(struct uart_amba_port *uap)
if (!uap->dmatx.chan)
return;
uap->dmatx.buf = kmalloc(PL011_DMA_BUFFER_SIZE, GFP_KERNEL);
uap->dmatx.buf = kmalloc(PL011_DMA_BUFFER_SIZE, GFP_KERNEL | __GFP_DMA);
if (!uap->dmatx.buf) {
dev_err(uap->port.dev, "no memory for DMA TX buffer\n");
uap->port.fifosize = uap->fifosize;