linux-kernel - [PATCH 2/2] dma: calculate the data tranferred by 8250

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Message-Id: <1381527738-9339-3-git-send-email-youquan.song@intel.com>
Date:	Fri, 11 Oct 2013 17:42:18 -0400
From:	Youquan Song <youquan.song@...el.com>
To:	dan.j.williams@...el.com, vinod.koul@...el.com,
	gregkh@...uxfoundation.org
Cc:	andriy.shevchenko@...el.com, mika.westerberg@...el.com,
	linux-kernel@...r.kernel.org,
	Youquan Song <youquan.song@...ux.intel.com>,
	Youquan Song <youquan.song@...el.com>
Subject: [PATCH 2/2] dma: calculate the data tranferred by 8250

When using UART transfers data by DMA mode, but it always shows 0 at 
/sys/class/dma/dma0chan*/bytes_transferred.

Call the new function to calculate how many the data has been transferred
 after doing it by DMA mode. 

Signed-off-by: Youquan Song <youquan.song@...el.com>
---
 drivers/tty/serial/8250/8250_dma.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_dma.c b/drivers/tty/serial/8250/8250_dma.c
index 7046769..b22ef80 100644
--- a/drivers/tty/serial/8250/8250_dma.c
+++ b/drivers/tty/serial/8250/8250_dma.c
@@ -83,7 +83,7 @@ int serial8250_tx_dma(struct uart_8250_port *p)
 	desc->callback = __dma_tx_complete;
 	desc->callback_param = p;
 
-	dma->tx_cookie = dmaengine_submit(desc);
+	dma->tx_cookie = dma_tx_submit_cal(desc, dma->txchan, dma->tx_size);
 
 	dma_sync_single_for_device(dma->txchan->device->dev, dma->tx_addr,
 				   UART_XMIT_SIZE, DMA_TO_DEVICE);
-- 
1.7.7.4

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