From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752124AbdBULHk (ORCPT ); Tue, 21 Feb 2017 06:07:40 -0500 Received: from atrey.karlin.mff.cuni.cz ([195.113.26.193]:36583 "EHLO atrey.karlin.mff.cuni.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752068AbdBULHP (ORCPT ); Tue, 21 Feb 2017 06:07:15 -0500 Date: Tue, 21 Feb 2017 12:07:12 +0100 From: Pavel Machek To: Geert Uytterhoeven Cc: Lorenzo Pieralisi , Mark Rutland , Sudeep Holla , Lina Iyer , John Stultz , Thomas Gleixner , "Rafael J . Wysocki" , Len Brown , Rob Herring , Magnus Damm , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-renesas-soc@vger.kernel.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH/RFC 3/6] drivers: firmware: psci: Implement shallow suspend mode Message-ID: <20170221110712.GB5021@amd> References: <1487622809-25127-1-git-send-email-geert+renesas@glider.be> <1487622809-25127-4-git-send-email-geert+renesas@glider.be> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="i9LlY+UWpKt15+FH" Content-Disposition: inline In-Reply-To: <1487622809-25127-4-git-send-email-geert+renesas@glider.be> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --i9LlY+UWpKt15+FH Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hi! > Enable support for "shallow" suspend mode, also known as "Standby" or > "Power-On Suspend". >=20 > As secondary CPU cores are taken offline, "shallow" suspend mode saves > slightly more power than "s2idle", but less than "deep" suspend mode. > However, unlike "deep" suspend mode, "shallow" suspend mode can be used > regardless of the presence of support for PSCI_SYSTEM_SUSPEND, which is > an optional API in PSCI v1.0. If system supports "shallow" suspend, why does not PSCI implement it? In the past, I was told PSCI will not turn into ACPI-like mess, and that we'll be able to fix PSCI and will not have to work around its problems in kernel :-(. Not your fault, Mark made those promises. Pavel =09 --=20 (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blo= g.html --i9LlY+UWpKt15+FH Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iEYEARECAAYFAlisH2AACgkQMOfwapXb+vL47QCeMEtnQeR77gPJgALoVZZgYNzi N7MAnjSylRHLAOXHzQ4x8iQfRP9DAR32 =hO/e -----END PGP SIGNATURE----- --i9LlY+UWpKt15+FH-- From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pavel Machek Subject: Re: [PATCH/RFC 3/6] drivers: firmware: psci: Implement shallow suspend mode Date: Tue, 21 Feb 2017 12:07:12 +0100 Message-ID: <20170221110712.GB5021@amd> References: <1487622809-25127-1-git-send-email-geert+renesas@glider.be> <1487622809-25127-4-git-send-email-geert+renesas@glider.be> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="i9LlY+UWpKt15+FH" Return-path: Content-Disposition: inline In-Reply-To: <1487622809-25127-4-git-send-email-geert+renesas-gXvu3+zWzMSzQB+pC5nmwQ@public.gmane.org> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Geert Uytterhoeven Cc: Lorenzo Pieralisi , Mark Rutland , Sudeep Holla , Lina Iyer , John Stultz , Thomas Gleixner , "Rafael J . Wysocki" , Len Brown , Rob Herring , Magnus Damm , devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, linux-renesas-soc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-pm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: devicetree@vger.kernel.org --i9LlY+UWpKt15+FH Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hi! > Enable support for "shallow" suspend mode, also known as "Standby" or > "Power-On Suspend". >=20 > As secondary CPU cores are taken offline, "shallow" suspend mode saves > slightly more power than "s2idle", but less than "deep" suspend mode. > However, unlike "deep" suspend mode, "shallow" suspend mode can be used > regardless of the presence of support for PSCI_SYSTEM_SUSPEND, which is > an optional API in PSCI v1.0. If system supports "shallow" suspend, why does not PSCI implement it? In the past, I was told PSCI will not turn into ACPI-like mess, and that we'll be able to fix PSCI and will not have to work around its problems in kernel :-(. Not your fault, Mark made those promises. Pavel =09 --=20 (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blo= g.html --i9LlY+UWpKt15+FH Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iEYEARECAAYFAlisH2AACgkQMOfwapXb+vL47QCeMEtnQeR77gPJgALoVZZgYNzi N7MAnjSylRHLAOXHzQ4x8iQfRP9DAR32 =hO/e -----END PGP SIGNATURE----- --i9LlY+UWpKt15+FH-- -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html From mboxrd@z Thu Jan 1 00:00:00 1970 From: pavel@ucw.cz (Pavel Machek) Date: Tue, 21 Feb 2017 12:07:12 +0100 Subject: [PATCH/RFC 3/6] drivers: firmware: psci: Implement shallow suspend mode In-Reply-To: <1487622809-25127-4-git-send-email-geert+renesas@glider.be> References: <1487622809-25127-1-git-send-email-geert+renesas@glider.be> <1487622809-25127-4-git-send-email-geert+renesas@glider.be> Message-ID: <20170221110712.GB5021@amd> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Hi! > Enable support for "shallow" suspend mode, also known as "Standby" or > "Power-On Suspend". > > As secondary CPU cores are taken offline, "shallow" suspend mode saves > slightly more power than "s2idle", but less than "deep" suspend mode. > However, unlike "deep" suspend mode, "shallow" suspend mode can be used > regardless of the presence of support for PSCI_SYSTEM_SUSPEND, which is > an optional API in PSCI v1.0. If system supports "shallow" suspend, why does not PSCI implement it? In the past, I was told PSCI will not turn into ACPI-like mess, and that we'll be able to fix PSCI and will not have to work around its problems in kernel :-(. Not your fault, Mark made those promises. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 181 bytes Desc: Digital signature URL: