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authorPeter Hurley <peter@hurleysoftware.com>2016-04-09 22:14:34 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-04-30 09:26:55 -0700
commited183ee689058775b24021272c3a01d356fe8e2e (patch)
tree5860a95febd7abfd59668ca55747d6a1c75658f9 /drivers/tty
parentddedfd82bc61c8d8d4d0eb754a9bcebb2e84de75 (diff)
downloadop-kernel-dev-ed183ee689058775b24021272c3a01d356fe8e2e.zip
op-kernel-dev-ed183ee689058775b24021272c3a01d356fe8e2e.tar.gz
serial: omap8250: Drop rx buffer sync
commit 27c310c5c312 ("serial: 8250_dma: no need to sync RX buffer") notes the RX DMA buffer is allocated from DMA coherent memory, and thus does not need sync'd for each transaction. The same is true for OMAP RX DMA. Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/serial/8250/8250_omap.c6
1 files changed, 0 insertions, 6 deletions
diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c
index abeaf5e..ca2a850 100644
--- a/drivers/tty/serial/8250/8250_omap.c
+++ b/drivers/tty/serial/8250/8250_omap.c
@@ -754,9 +754,6 @@ static void __dma_rx_do_complete(struct uart_8250_port *p, bool error)
unsigned long flags;
int ret;
- dma_sync_single_for_cpu(dma->rxchan->device->dev, dma->rx_addr,
- dma->rx_size, DMA_FROM_DEVICE);
-
spin_lock_irqsave(&priv->rx_dma_lock, flags);
if (!dma->rx_running)
@@ -868,9 +865,6 @@ static int omap_8250_rx_dma(struct uart_8250_port *p, unsigned int iir)
dma->rx_cookie = dmaengine_submit(desc);
- dma_sync_single_for_device(dma->rxchan->device->dev, dma->rx_addr,
- dma->rx_size, DMA_FROM_DEVICE);
-
dma_async_issue_pending(dma->rxchan);
out:
spin_unlock_irqrestore(&priv->rx_dma_lock, flags);
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