From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mxweb5.versatel.de ([82.140.32.141]:33511 "EHLO mxweb5.versatel.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757362Ab2AXShg (ORCPT ); Tue, 24 Jan 2012 13:37:36 -0500 Received: from cinnamon-sage.de (i577A8E19.versanet.de [87.122.142.25]) (authenticated bits=0) by ens28fl.versatel.de (8.12.11.20060308/8.12.11) with SMTP id q0OIbXg3008376 for ; Tue, 24 Jan 2012 19:37:33 +0100 Received: from 192.168.23.2:49482 by cinnamon-sage.de for ,,, ; 24.01.2012 19:37:33 Message-ID: <4F1EFA6E.50704@flensrocker.de> Date: Tue, 24 Jan 2012 19:37:34 +0100 From: Lars Hanisch MIME-Version: 1.0 To: Devin Heitmueller CC: Antti Palosaari , "Hawes, Mark" , linux-media@vger.kernel.org Subject: Re: HVR 4000 hybrid card still producing multiple frontends for single adapter References: <44895934A66CD441A02DCF15DD759BA0011CAE69@SYDEXCHTMP2.au.fjanz.com> <4F1E9A78.7020203@iki.fi> <4F1EC725.7090204@iki.fi> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-media-owner@vger.kernel.org List-ID: Hi, Am 24.01.2012 16:16, schrieb Devin Heitmueller: > On Tue, Jan 24, 2012 at 9:58 AM, Antti Palosaari wrote: >> So what was the actual benefit then just introduce one way more to implement >> same thing. As I sometime understood from Manu's talk there will not be >> difference if my device is based of DVB-T + DVB-C demod combination or just >> single chip that does same. Now there is devices that have same >> characteristics but different interface. > > For one thing, you cannot use DVB-T and DVB-C at the same time if > they're on the same demod. With many of the devices that have S/S2 > and DVB-T, you can be using them both in parallel. Having multiple > frontends actually makes sense since you don't want two applications > talking to the same frontend at the same time but operating on > different tuners/streams. The two frontends of the HVR 4000 can only be open mutually exclusive so I think the recent changes are for those devices, aren't they? Sure you can connect DVB-T and DVB-S at the same time to the HVR 4000, but you can't use it in parallel. Lars. > > That said, there could be opportunities for consolidation if the > demods could not be used in parallel, but I believe that would require > a nontrivial restructuring of the core code and API. In my opinion > the entry point for the kernel ABI should *never* have been the > demodulator but rather the bridge driver (where you can exercise > greater control over what can be used in parallel). > > Devin >