I still get DMA errors using the new drivers. Using PIO mode in 0.9.2,
while keeping my processor humming at 50%, works consistently. FYI, the
DMA errors look like this in 0.10.0:
Feb 17 15:13:50 algae-srv ivtv0 warning: ENC DMA ERROR b
Feb 17 15:13:50 algae-srv ivtv0 warning: ENC DMA ERROR b
Feb 17 15:13:52 algae-srv ivtv0 warning: encoder MPEG: offset 128 -> 88
Feb 17 15:14:45 algae-srv ivtv0 warning: ENC DMA ERROR b
Feb 17 15:14:45 algae-srv ivtv0 warning: ENC DMA ERROR b
Feb 17 15:14:45 algae-srv ivtv0 warning: encoder MPEG: offset 128 -> 0
Feb 17 15:15:15 algae-srv ivtv0 warning: ENC DMA ERROR b
Feb 17 15:15:15 algae-srv ivtv0 warning: ENC DMA ERROR b
Feb 17 15:15:16 algae-srv ivtv0 warning: encoder MPEG: offset 128 -> 0
Feb 17 15:15:28 algae-srv ivtv0 warning: ENC DMA ERROR b
Feb 17 15:15:28 algae-srv ivtv0 warning: encoder MPEG: offset 128 -> 0
Feb 17 15:15:30 algae-srv ivtv0 warning: ENC DMA ERROR b
Feb 17 15:15:31 algae-srv ivtv0 warning: encoder MPEG: offset 128 -> 0
Feb 17 15:15:54 algae-srv ivtv0 warning: ENC DMA ERROR b
Feb 17 15:15:55 algae-srv ivtv0: DMA TIMEOUT 00000001 0
I changed line 80 in ivtv-streams.c to:
PCI_DMA_FROMDEVICE, 1, V4L2_BUF_TYPE_VIDEO_CAPTURE
This does not give me any data on /dev/video0.
On Sun, 2007-02-18 at 02:46 +0100, Hans Verkuil wrote:
> On Saturday 17 February 2007 21:24, Larry Bernstone wrote:
> > Is there any way to force PIO mode in ivtv-0.10.0?
>
> Theoretically you could set the pio field in the ivtv_stream_info
> array
> in ivtv-streams.c to 1. But that's never been tested.
>
> Why?
>
> Regards,
>
> Hans
>
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