Hi,
Am Freitag, den 20.03.2009, 14:24 -0600 schrieb Gordon Smith:
> Hello -
>
> I'm unable to read or stream compressed data from saa7134/saa6752hs.
>
> I have a RTD Technologies VFG7350 (saa7134 based, two channel,
> hardware encoder per channel, no tuner) running current v4l-dvb in
> debian 2.6.26-1.
>
> MPEG2-TS data is normally available on /dev/video2 and /dev/video3.
>
> Previously there were parameters for the saa6752hs module named
> "force" and "ignore" to modify i2c addresses. The current module
> appears to lack those parameters and may be using incorrect i2c addresses.
>
> Current dmesg:
>
> [ 13.388944] saa6752hs 3-0020: chip found @ 0x40 (saa7133[0])
> [ 13.588458] saa6752hs 4-0020: chip found @ 0x40 (saa7133[1])
>
> Prior dmesg (~2.6.25-gentoo-r7 + v4l-dvb ???):
>
> saa6752hs 1-0021: saa6752hs: chip found @ 0x42
> saa6752hs 1-0021: saa6752hs: chip found @ 0x42
>
> Prior modprobe.conf entry:
> options saa6752hs force=0x1,0x21,0x2,0x21 ignore=0x0,0x20,0x1,0x20,0x2,0x20
>
>
> $ v4l2-dbg --device /dev/video2 --info
> Driver info:
> Driver name : saa7134
> Card type : RTD Embedded Technologies VFG73
> Bus info : PCI:0000:02:08.0
> Driver version: 526
> Capabilities : 0x05000001
> Video Capture
> Read/Write
> Streaming
>
> Streaming is a listed capability but the capture example at
> http://v4l2spec.bytesex.org/spec/capture-example.html fails
> during request for buffers.
>
> $ v4l2-capture --device /dev/video2 --mmap
> /dev/video2 does not support memory mapping
>
> v4l2-capture.c:
> req.count = 4;
> req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
> req.memory = V4L2_MEMORY_MMAP;
>
> if (-1 == xioctl (fd, VIDIOC_REQBUFS, &req)) {
> if (EINVAL == errno) {
> fprintf (stderr, "%s does not support "
> "memory mapping\n", dev_name);
>
>
> A read() results in EIO error:
>
> $ v4l2-capture --device /dev/video0 --read
> read error 5, Input/output error
>
> v4l2-capture.c:
> if (-1 == read (fd, buffers[0].start, buffers[0].length)) {
> switch (errno) {
> ...
> default:
> errno_exit ("read");
>
>
> This behavior does not change if the saa6752hs module is not loaded.
>
> Is there still a way to modify the i2c address(es) for the saa6752hs module?
>
> Any pointers are appreciated.
>
> Gordon
>
thanks for the report.
It was probably forgotten that the prior insmod option had a reason.
Try to change it to 0x21 in saa7134-i2c.c
static char *i2c_devs[128] = {
[ 0x20 ] = "mpeg encoder (saa6752hs)",
[ 0xa0 >> 1 ] = "eeprom",
[ 0xc0 >> 1 ] = "tuner (analog)",
[ 0x86 >> 1 ] = "tda9887",
[ 0x5a >> 1 ] = "remote control",
};
and report if your cards a usable again.
Seems we need the chip address per card without that insmod option and
reliable probing.
Cheers,
Hermann
--
To unsubscribe from this list: send the line "unsubscribe linux-media" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
