redonkable/alistair23-linux
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serial: omap8250: Drop rx buffer sync

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commit 27c310c5c3 ("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>
This commit is contained in:
Peter Hurley 2016-04-09 22:14:34 -07:00 committed by Greg Kroah-Hartman
parent ddedfd82bc
commit ed183ee689
1 changed files with 0 additions and 6 deletions
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6
drivers/tty/serial/8250/8250_omap.c
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@ -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);