From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from fep27.mx.upcmail.net ([62.179.121.47]:51711 "EHLO fep27.mx.upcmail.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753123AbbFDRgw (ORCPT ); Thu, 4 Jun 2015 13:36:52 -0400 Message-ID: <55708CB2.8090502@chello.at> Date: Thu, 04 Jun 2015 19:36:50 +0200 From: Hurda MIME-Version: 1.0 To: Antti Palosaari , linux-media@vger.kernel.org Subject: Re: si2168/dvbsky - blind-scan for DVB-T2 with PLP fails References: <556644C7.8040701@chello.at> <5566A70A.1090805@iki.fi> In-Reply-To: <5566A70A.1090805@iki.fi> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-media-owner@vger.kernel.org List-ID: How can I enable debug-output to get the log-messages like http://git.linuxtv.org/cgit.cgi/media_tree.git/tree/drivers/media/dvb-frontends/si2168.c#n164 ? Am 28.05.2015 07:26, schrieb Antti Palosaari: > On 05/28/2015 01:27 AM, Hurda wrote: >> Hello. >> >> I think I came across a bug in either of the drivers si2168 and dvbsky >> regarding >> blind-scanning DVB-T2-frequencies. >> >> HW: Technotrend CT2-4400v2 (afaik based on or the same as DVBSky T330) >> demod: Si2168-B40 >> tuner: Si2158-A20 >> OS: Ubuntu 15.04 (kernel 3.19) >> >> In Austria, the DVB-T2-service "SimpliTV" is currently airing up to four >> muxes, next to one or two DVB-T-muxes. >> In my region, the frequencies are 490MHz, 546MHz, 690MHz, 714MHz for >> DVB-T2, >> and 498MHz for DVB-T. >> These numbers might be of interest when reading the logs. >> >> The peculiar aspect of these T2-muxes is that they're aired on PLP 1 >> without >> there being a PLP 0. I think this is also the root of my problem. > > dvbv5-scan is working, but w_scan not? > > Could you hack si2168.c file and test? > > if (c->delivery_system == SYS_DVBT2) { > /* select PLP */ > cmd.args[0] = 0x52; > cmd.args[1] = c->stream_id & 0xff; > // cmd.args[2] = c->stream_id == NO_STREAM_ID_FILTER ? 0 : 1; > cmd.args[2] = 0; > cmd.wlen = 3; > cmd.rlen = 1; > ret = si2168_cmd_execute(client, &cmd); > if (ret) > goto err; > } > > Antti > >> >> >> When doing a blind-scan using w_scan 20140727 on Ubuntu 15.04 (kernel >> 3.19), >> w_scan does not find any of these four DVB-T2-muxes. >> It just finds the DVB-T-mux. >> >> Logs: >> media-tree_dmesg_lsusb.txt http://pastebin.com/0ixFPMSA >> media-tree_w_scan.txt http://pastebin.com/yyG3jSwj >> >> The found transponder: >> initial_v3_media_build_trunk.conf http://pastebin.com/LmFQavpy >> initial_v5.conf http://pastebin.com/Jx6kymVt >> >> I also tried a fresh checkout from git.linuxtv.org as of last weekend >> and the >> most recent w_scan version (20141122). >> >> As you can see, w_scan tries to tune(?) the DVB-T2-frequencies, but >> ultimately doesn't find anything on them. >> >> >> Then I tried the DVBSky-linux-driver[1] >> (media_build-bst-20150322.tar.gz)[2] >> from their site, which is using a binary called sit2 for this card. >> Using this driver, w_scan found all four DVB-T2-muxes and the DVB-T-mux. >> Additionally, it found the DVB-T2-muxes during the DVB-T-scan. >> >> Logs: >> media_build-bst_dmesg_lsusb.txt http://pastebin.com/vJeDMxtu >> media_build-bst_w_scan.txt http://pastebin.com/yhwAYjen >> >> Found transponders: >> initial_v3_bst.conf http://pastebin.com/ECKQvRWX >> initial_v5_bst.conf http://pastebin.com/CbhY6Hpz >> >> Of course, doing a channel-scan using dvbv5-scan on these transponders >> worked >> too: >> >> dvbv5_sit2.conf http://pastebin.com/3W52bbhv >> dvbv5_sit2.log http://pastebin.com/nc66PTkt >> >> Afterwards, I tried to do a channel-scan with the same initial tuning-file >> using the opensource-driver, which also worked: >> >> dvbv5_si2168.conf http://pastebin.com/A6FbqUL1 >> dvbv5_si2168.log http://pastebin.com/ewyVPJR2 >> >> This should verify that tuning PLP 1 without there being PLP 0 is not >> the issue. >> >> >> Additionally, if you compare the two channel-lists, you find interesting >> differences: >> >> The scan with si2168 has AUTO for "MODULATION" and "INVERSION" for >> DVB-T2-channels, and for "CODE_RATE_LP" and "INVERSION" for DVB-T-channels. >> >> The scan with sit2 has the respective values in the channel-list. >> >> The dvbv5-scan-logs also differ, as using sit2 also displays the signal >> quality >> during tuning. >> >> >> I know that there were changes regarding DVB-T2-scanning[3], but as the >> blog- >> article specifically mentions si2168 and w_scan to be fully dvbv5-compliant >> and good for using with DVB-T2, I thought you should know about this >> particular problem. >> >> >> In the attachment I've packed the previously linked logs, for archival >> reasons. >> >> >> Thank you for your attention. >> >> [1] http://www.dvbsky.net/Support_linux.html >> [2] http://www.dvbsky.net/download/linux/media_build-bst-150322.tar.gz >> [3] http://blog.palosaari.fi/2014/09/linux-dvb-t2-tuning-problems.html >> >> PS: Interesting comments regarding auto-detection for si2168: >> http://blog.palosaari.fi/2014/09/linux-dvb-t2-tuning-problems.html?showComment=1427233615765#c8591459871945922951 >> >> >> http://blog.palosaari.fi/2014/09/linux-dvb-t2-tuning-problems.html?showComment=1427234034259#c6500661729983566638 >> >> >