| Message ID | 1522699141-11464-1-git-send-email-brad@nextdimension.cc (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Am 02.04.2018 um 21:59 schrieb Brad Love: > The cx231xx USB bridge has issue streaming QAM256 DVB-C channels. > QAM64 channels were fine, but QAM256 channels produced corrupted > transport streams. > > cx231xx alt mode 4 does not provide enough bandwidth to acommodate > QAM256 DVB-C channels, most likely DVB-T2 channels would break up > as well. Alt mode 5 increases bridge bandwidth to 90Mbps, and > fixes QAM256 DVB-C streaming. > Hi Brad, I read through the media commits applied in the last weeks. This patch looks so simple and yet resolves the (for me) unexplainable behaviour of the Hauppauge WinTV-HVR-930C-HD. DVB-C reception did only produce garbage, but the the same demod driver (si2165) does work perfectly in a PCI device. Thank you for fixing this issue. Regards Matthias
Hi Matthias, On 2018-06-05 13:04, Matthias Schwarzott wrote: > Am 02.04.2018 um 21:59 schrieb Brad Love: >> The cx231xx USB bridge has issue streaming QAM256 DVB-C channels. >> QAM64 channels were fine, but QAM256 channels produced corrupted >> transport streams. >> >> cx231xx alt mode 4 does not provide enough bandwidth to acommodate >> QAM256 DVB-C channels, most likely DVB-T2 channels would break up >> as well. Alt mode 5 increases bridge bandwidth to 90Mbps, and >> fixes QAM256 DVB-C streaming. >> > Hi Brad, > > I read through the media commits applied in the last weeks. > > This patch looks so simple and yet resolves the (for me) unexplainable > behaviour of the Hauppauge WinTV-HVR-930C-HD. DVB-C reception did only > produce garbage, but the the same demod driver (si2165) does work > perfectly in a PCI device. > > Thank you for fixing this issue. > > Regards > Matthias Happy to get this fixed for you :) If you know of any other outstanding issues with Hauppauge hardware, feel free to point me at them. Cheers, Brad
diff --git a/drivers/media/usb/cx231xx/cx231xx-dvb.c b/drivers/media/usb/cx231xx/cx231xx-dvb.c index 7130294..67ed667 100644 --- a/drivers/media/usb/cx231xx/cx231xx-dvb.c +++ b/drivers/media/usb/cx231xx/cx231xx-dvb.c @@ -276,7 +276,7 @@ static int start_streaming(struct cx231xx_dvb *dvb) if (dev->USE_ISO) { dev_dbg(dev->dev, "DVB transfer mode is ISO.\n"); - cx231xx_set_alt_setting(dev, INDEX_TS1, 4); + cx231xx_set_alt_setting(dev, INDEX_TS1, 5); rc = cx231xx_set_mode(dev, CX231XX_DIGITAL_MODE); if (rc < 0) return rc;
The cx231xx USB bridge has issue streaming QAM256 DVB-C channels. QAM64 channels were fine, but QAM256 channels produced corrupted transport streams. cx231xx alt mode 4 does not provide enough bandwidth to acommodate QAM256 DVB-C channels, most likely DVB-T2 channels would break up as well. Alt mode 5 increases bridge bandwidth to 90Mbps, and fixes QAM256 DVB-C streaming. Signed-off-by: Brad Love <brad@nextdimension.cc> --- drivers/media/usb/cx231xx/cx231xx-dvb.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)