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Subject: media: cx231xx: Increase USB bridge bandwidth
Author:  Brad Love <>
Date:    Mon Apr 2 15:59:01 2018 -0400

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 <>
Signed-off-by: Mauro Carvalho Chehab <>

 drivers/media/usb/cx231xx/cx231xx-dvb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)


diff --git a/drivers/media/usb/cx231xx/cx231xx-dvb.c 
index 713029420fcf..67ed66712d05 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;

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