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Thu, 2 Jul 2020 03:48:06 +0000 Subject: Re: [PATCH v4 15/23] ASoC: soc-core: Identify 'no_pcm' DAI links for DPCM To: Kuninori Morimoto References: <1593233625-14961-1-git-send-email-spujar@nvidia.com> <1593233625-14961-16-git-send-email-spujar@nvidia.com> <87h7utytlx.wl-kuninori.morimoto.gx@renesas.com> <9c7871ae-6649-7b0d-4780-c8389c299b04@nvidia.com> <87d05ezqlc.wl-kuninori.morimoto.gx@renesas.com> From: Sameer Pujar Message-ID: <49bac9c1-093c-d353-cef3-c9c3391cc00d@nvidia.com> Date: Thu, 2 Jul 2020 09:18:02 +0530 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.9.0 MIME-Version: 1.0 In-Reply-To: <87d05ezqlc.wl-kuninori.morimoto.gx@renesas.com> X-Originating-IP: [10.124.1.5] X-ClientProxiedBy: HQMAIL105.nvidia.com (172.20.187.12) To HQMAIL107.nvidia.com (172.20.187.13) Content-Type: text/plain; charset="utf-8"; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-GB DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1593661645; bh=Oqf1zdTjnVv4xMqY49vlWn2YQFtjEyzUTTviPf0shsg=; h=X-PGP-Universal:CC:Subject:To:References:From:Message-ID:Date: User-Agent:MIME-Version:In-Reply-To:X-Originating-IP: X-ClientProxiedBy:Content-Type:Content-Transfer-Encoding: Content-Language; b=dgbcAyxkORD4uUkBD9tIkxdAENIWG1QJUhYTAarenLayi6aUtMJzOtPwxqdlX11aH zadPx+3Ks3QUFs89mSsFyx1sNuPJfCReUFPP75q6vJW+qOBg+QxZx48aixd5xqJ0HP NrkRa8ZYVniq52jGPIBJf2+vku+uQc6ZtJp6wxrt6PxWDpw4jns5sINzrMTwUDXZMj gJjX98OC4AmkOxBoWSRJT3mXDfeVcg5WcrP6EKxnJAGNzNN1N3aFZ9EBzgAMEw0qs7 2Pyu7ezIf8iHbyz21lsLDl66vCsP4Dpz0pdQMBC5ZVA21HgkbGGP6J6NOihWIsP+3b YW8wiHW+MBBMg== Cc: jonathanh@nvidia.com, nicoleotsuka@gmail.com, alsa-devel@alsa-project.org, atalambedu@nvidia.com, swarren@nvidia.com, linux-kernel@vger.kernel.org, spujar@nvidia.com, nwartikar@nvidia.com, lgirdwood@gmail.com, robh+dt@kernel.org, tiwai@suse.com, viswanathl@nvidia.com, sharadg@nvidia.com, broonie@kernel.org, thierry.reding@gmail.com, linux-tegra@vger.kernel.org, digetx@gmail.com, rlokhande@nvidia.com, mkumard@nvidia.com, dramesh@nvidia.com X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: "Alsa-devel" On 7/2/2020 6:22 AM, Kuninori Morimoto wrote: > External email: Use caution opening links or attachments > > > Hi Sameer > >>> At least my CPU driver doesn't use component:pcm_construct >>> but is using DAI:pcm_new for some reasons. >>> I'm not sure checking DAI:pcm here is enough, or not... >> OK. If adding DAI:pcm_new above here is not sufficient, then a flag >> can be used to describe FE component? or is there a better >> alternative? > soc_component_is_pcm() is called from simple_dai_link_of_dpcm :: "FE" side. Yes I had to use this on "FE" side only because I wanted to find a real "FE" in FE<->BE and BE<->BE links. Please have a look at patch [23/23] for the sound DT binding I am using. Basically I want to connect multiple components in a chained fashion (FE <-> BE1 <-> BE2 ... ). Some of these BEs can be SoC components like resampler/mixer/mux/de-mux etc., the HW I am using has a cross bar which allows me to select/connect BEs in any order and I am trying to have the same flexibility here. Hence I only want to create PCM devices for real "FE" and trying to use simple-card as much as possible. More details about the HW and problems were discussed in [0]. [0] https://lkml.org/lkml/2020/4/30/519 > I wonder component->driver->non_legacy_dai_naming can't work for you ? I see currently in simple-card driver that, BE<->BE link would be treated as CODEC<->CODEC link if 'non_legacy_dai_naming' flag is set at both ends of BE. Do we need to set this flag for all BE? However I am not sure how this will work out for a BE<->BE DPCM DAI link considering the fact that I want to use chain of components and I guess routing map would get complicated. Also going by the flag name it was not meant to differentiate between a FE and BE? > Thank you for your help !! > > Best regards > --- > Kuninori Morimoto