From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id 5959F723 for ; Wed, 28 Jun 2017 20:27:25 +0000 (UTC) Received: from atrey.karlin.mff.cuni.cz (atrey.karlin.mff.cuni.cz [195.113.26.193]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id C1CCB271 for ; Wed, 28 Jun 2017 20:27:24 +0000 (UTC) Date: Wed, 28 Jun 2017 22:27:22 +0200 From: Pavel Machek To: Sebastian Reichel Message-ID: <20170628202722.GC18101@amd> References: <20170626064947.GF23064@atomide.com> <20170626111207.GA11688@amd> <20170626114931.GG23064@atomide.com> <20170626131401.GA11980@amd> <20170626134904.GH23064@atomide.com> <20170626204932.GA19396@amd> <20170627071835.GJ23064@atomide.com> <20170627121455.tljtekx6bmzlezxa@earth> <20170627215727.GA5250@amd> <20170628160112.ip2ambkzlkkoz2ww@earth> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="Bu8it7iiRSEf40bY" Content-Disposition: inline In-Reply-To: <20170628160112.ip2ambkzlkkoz2ww@earth> Cc: ksummit-discuss@lists.linuxfoundation.org Subject: Re: [Ksummit-discuss] [TECH TOPIC] mobile phones List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , --Bu8it7iiRSEf40bY Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hi! > > Oh, another major piece is DSP coprocessor that is there. Unlike > > graphics, we don't even know how support for it should like. >=20 > https://www.kernel.org/doc/Documentation/remoteproc.txt >=20 > config OMAP_REMOTEPROC > tristate "OMAP remoteproc support" > [...] > help > Say y here to support OMAP's remote processors (dual M3 > and DSP on OMAP4) via the remote processor framework. >=20 > Currently only supported on OMAP4. >=20 > Usually you want to say Y here, in order to enable multimedia > use-cases to run on your platform (multimedia codecs are > offloaded to remote DSP processors using this framework). >=20 > It's safe to say N here if you're not interested in multimedia > offloading or just want a bare minimum kernel. >=20 > I have been told by some Nokia people (I do not remember who it > was, possibly Sakari), that the DSP is not that powerful and any > calculation should also be possible on CPU (wasting a bit of > energy). Ok, we probably don't care about DSP, but lets say we had really fast DSP or really cared about power. We'd need remoteproc. Sure. But that has no interface for userland, right? So we'd need to introduce interface for userland... fine. And then we'd need cross-compilers for the DSP used. Ok. And then we'd need to split mpg123 to CPU and DSP parts, and modify it so that it can run the DSP parts using remoteproc, when available? That starts to be ... complex, with changes all over the system :-(. Pavel --=20 (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blo= g.html --Bu8it7iiRSEf40bY Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iEYEARECAAYFAllUESoACgkQMOfwapXb+vI+/QCcDKtO2dKKTCt9UPNEzn+jR+0N bCMAoLORV4S/wEEh+KRT0w0FGFazZwxc =ZSSU -----END PGP SIGNATURE----- --Bu8it7iiRSEf40bY--