From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933095AbdBPTFW (ORCPT ); Thu, 16 Feb 2017 14:05:22 -0500 Received: from mezzanine.sirena.org.uk ([106.187.55.193]:35574 "EHLO mezzanine.sirena.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755209AbdBPTFT (ORCPT ); Thu, 16 Feb 2017 14:05:19 -0500 From: Mark Brown To: Javier Martinez Canillas Cc: Mark Brown , linux-kernel@vger.kernel.org, Mauro Carvalho Chehab , Andi Shyti , Mark Brown , Shuah Khan , Inki Dae , Jon Hunter , Liam Girdwood , linux-kernel@vger.kernel.org In-Reply-To: <20170216173002.28142-1-javier@osg.samsung.com> Message-Id: Date: Thu, 16 Feb 2017 19:05:03 +0000 X-SA-Exim-Connect-IP: 2001:470:1f1d:6b5::3 X-SA-Exim-Mail-From: broonie@sirena.org.uk Subject: Applied "regulator: core: Resolve supplies before disabling unused regulators" to the regulator tree X-SA-Exim-Version: 4.2.1 (built Mon, 26 Dec 2011 16:24:06 +0000) X-SA-Exim-Scanned: No (on mezzanine.sirena.org.uk); Unknown failure Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The patch regulator: core: Resolve supplies before disabling unused regulators has been applied to the regulator tree at git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator.git All being well this means that it will be integrated into the linux-next tree (usually sometime in the next 24 hours) and sent to Linus during the next merge window (or sooner if it is a bug fix), however if problems are discovered then the patch may be dropped or reverted. You may get further e-mails resulting from automated or manual testing and review of the tree, please engage with people reporting problems and send followup patches addressing any issues that are reported if needed. If any updates are required or you are submitting further changes they should be sent as incremental updates against current git, existing patches will not be replaced. Please add any relevant lists and maintainers to the CCs when replying to this mail. Thanks, Mark >>From 3827b64dba27ebadb4faf51f2c91143e01ba1f6d Mon Sep 17 00:00:00 2001 From: Javier Martinez Canillas Date: Thu, 16 Feb 2017 14:30:02 -0300 Subject: [PATCH] regulator: core: Resolve supplies before disabling unused regulators After commit 66d228a2bf03 ("regulator: core: Don't use regulators as supplies until the parent is bound"), input supplies aren't resolved if the input supplies parent device has not been bound. This prevent regulators to hold an invalid reference if its supply parent device driver probe is deferred. But this causes issues on some boards where a PMIC's regulator use as input supply a regulator from another PMIC whose driver is registered after the driver for the former. In this case the regulators for the first PMIC will fail to resolve input supplies on regulators registration (since the other PMIC wasn't probed yet). And when the core attempts to resolve again latter when the other PMIC registers its own regulators, it will fail again since the parent device isn't bound yet. This will cause some parent supplies to never be resolved and wrongly be disabled on boot due taking them as unused. To solve this problem, also attempt to resolve the pending regulators input supplies before disabling the unused regulators. Signed-off-by: Javier Martinez Canillas Signed-off-by: Mark Brown --- drivers/regulator/core.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index 04baac9a165b..8028835d3967 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -4540,6 +4540,16 @@ static int __init regulator_init_complete(void) if (of_have_populated_dt()) has_full_constraints = true; + /* + * Regulators may had failed to resolve their input supplies + * when were registered, either because the input supply was + * not registered yet or because its parent device was not + * bound yet. So attempt to resolve the input supplies for + * pending regulators before trying to disable unused ones. + */ + class_for_each_device(®ulator_class, NULL, NULL, + regulator_register_resolve_supply); + /* If we have a full configuration then disable any regulators * we have permission to change the status for and which are * not in use or always_on. This is effectively the default -- 2.11.0