From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mx1.redhat.com ([209.132.183.28]:28308 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755357Ab1LGNMf (ORCPT ); Wed, 7 Dec 2011 08:12:35 -0500 Message-ID: <4EDF6640.801@redhat.com> Date: Wed, 07 Dec 2011 11:12:32 -0200 From: Mauro Carvalho Chehab MIME-Version: 1.0 To: gennarone@gmail.com CC: linux-media@vger.kernel.org Subject: Re: [PATCH 0/1] xc3028: force reload of DTV7 firmware in VHF band with Zarlink demodulator References: <4EDE27A0.8060406@gmail.com> In-Reply-To: <4EDE27A0.8060406@gmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-media-owner@vger.kernel.org List-ID: On 06-12-2011 12:33, Gianluca Gennari wrote: > Hi All, > > I have a Terratec Cinergy Hybrid T USB XS stick (USB 0ccd:0042). > This device is made of the following components: > - Empiatech em2880 USB bridge; > - Zarlink zl10353 demodulator; > - Xceive XC3028 tuner; > > For this device, the ZARLINK456 define is set to true so it is using the > firmwares with type D2633 for the XC3028 tuner. > > I found out that: > 1) the DTV7 firmware works fine in VHF band (bw=7MHz); > 2) the DTV8 firmware works fine in UHF band (bw=8MHz); > 3) the DTV78 firmware works fine in UHF band (bw=8MHz) but it doesn not > work at all in VHF band (bw=7MHz); > > In fact, when the DTV78 firmware is loaded and I try to tune a VHF > channel, the frequency lock is ciclically acquired for a second and > immediately lost. > So the proposed patch forces a reload of the DTV7 firmware every time a > 7MHz channel is requested. > The only drawback is that channel change from VHF to UHF or viceversa is > slightly slower. > Devices using the D2620 firmwares are unaffected. Hi Gianluca, The issues with firmware DTV78 x DTV7/DTV8 are old. No matter what we do, we end by having troubles, as the issue is Country-dependent. For example, Australia requires a different firmware than Germany, due to the differences on the VHF/UHF bands. I prefer if you could work into a patch that would add some modprobe parameter to disable the current "autodetection" way, allowing to override the firmware used for VHF and UHF. Thanks, Mauro