From: Frank Mori Hess <fmhess@speakeasy.net>
Date: Sat, 4 Nov 2006 02:39:46 +0000 (+0000)
Subject: Do 32 bit dma transfers for analog output.
X-Git-Tag: r0_7_74~163
X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=46d8712cf118b07fe02c2abae942ec8701cf57ff;p=comedi.git

Do 32 bit dma transfers for analog output.
---

diff --git a/comedi/drivers/ni_mio_common.c b/comedi/drivers/ni_mio_common.c
index 08e16860..4d8678b6 100644
--- a/comedi/drivers/ni_mio_common.c
+++ b/comedi/drivers/ni_mio_common.c
@@ -1215,10 +1215,14 @@ static void ni_ao_setup_MITE_dma(comedi_device *dev,comedi_cmd *cmd)
 	mite_chan->current_link = 0;
 	mite_chan->dir = COMEDI_OUTPUT;
 	if(boardtype.reg_type & (ni_reg_611x | ni_reg_6713))
+	{
 		mite_prep_dma(mite, AO_DMA_CHAN, 32, 32);
-	else
-		mite_prep_dma(mite, AO_DMA_CHAN, 16, 16);
-
+	}else
+	{
+		/* doing 32 instead of 16 bit wide transfers from memory 
+		 makes the mite do 32 bit pci transfers, doubling pci bandwidth. */
+		mite_prep_dma(mite, AO_DMA_CHAN, 16, 32);
+	}
 	/*start the MITE*/
 	mite_dma_arm(mite, AO_DMA_CHAN);
 }