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Thu, 17 Oct 2019 10:28:43 +0000 (GMT) Received: from eusmgms2.samsung.com (unknown [182.198.249.180]) by eusmtrp2.samsung.com (KnoxPortal) with ESMTP id 20191017102843eusmtrp2d58a7d10f4a48b53240821211d2f0e9c~OaGnXm8t71361913619eusmtrp2K; Thu, 17 Oct 2019 10:28:43 +0000 (GMT) X-AuditID: cbfec7f5-4f7ff70000001116-1a-5da8425c3687 Received: from eusmtip2.samsung.com ( [203.254.199.222]) by eusmgms2.samsung.com (EUCPMTA) with SMTP id 75.49.04117.B5248AD5; Thu, 17 Oct 2019 11:28:43 +0100 (BST) Received: from AMDC2765.digital.local (unknown [106.120.51.73]) by eusmtip2.samsung.com (KnoxPortal) with ESMTPA id 20191017102843eusmtip2154fff2e728f839a3ab68c2c7c7c59b3~OaGm3D8PH0361203612eusmtip2R; Thu, 17 Oct 2019 10:28:43 +0000 (GMT) From: Marek Szyprowski To: linux-pm@vger.kernel.org, linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Marek Szyprowski , Viresh Kumar , Nishanth Menon , Stephen Boyd , Mark Brown , Dmitry Osipenko , Bartlomiej Zolnierkiewicz , Kamil Konieczny , Krzysztof Kozlowski Subject: [PATCH] opp: core: Revert "add regulators enable and disable" Date: Thu, 17 Oct 2019 12:27:58 +0200 Message-Id: <20191017102758.8104-1-m.szyprowski@samsung.com> X-Mailer: git-send-email 2.17.1 X-Brightmail-Tracker: H4sIAAAAAAAAA0VSa0hTYRj229k5Ow6nx03yw8RyUZDiTLI4pISG5X4E9UOEyqEzDzp0Uzav XcDNTDetlmQtExWTpvM+RVPcKBNnic1LlgijaV4gEtJpmIq1ebT+Pe9zeZ+PjxdHuCWoHy6R ZVNymTiDj7GZPcO/rSEJFxpFp3498iI7de0oWTm3gJHNq98AWbemQ0mrtYNFTvVXY6TjwRAg dVYzg2wdsrHIH5tjDHL3cyeT7LIPY1Eewr4qG0toNKgx4cNuAxBaZnoZQocx4Cp6nR2ZQmVI cil56Pkkdprukx1kqb3ze1fWkEJQ7akB7jgkwqHVNoBpABvnEo0AjlRtM10Cl1gHcHnOnxYc ADqGOpgHidmBSSYt6AFcrKxH6MGZUJumMJcLI8KgZkXjxDjuQyTC9o1zLg9CLDHgY1M36uJ5 xCVo3LzisjOJ43Bh0bQX5RCRsMX2E6PLjsDmjjd7+yGxjcGlmi5ACzGwqKwcpTEPfrd0s2js D//01TLoQBGAcx9bWfRQDuCUSrefjoDvLBN7r0CIk7C9P5Smo2GbdgRx0ZDwhDMr3i4accKK nmf7NAeW3ufS7hOwytL2r/bt+CRCYyEcXdsC9C+KoNrWhGlBQNX/rjoADMCXylFIUynFaRmV J1CIpYocWargZqbUCJznMbpr2XgNzDvJg4DAAd+Do53Xi7ioOFdRIB0EEEf4Ppzaew0iLidF XHCLkmcmynMyKMUgOIwz+b6c2272G1wiVZxNpVNUFiU/UBm4u18h4NUnFZPrxWZlgl3y1WaI VCl3DNrn6i2UnfWl5kleCVBNBIOLZXERAgwTSA/FKk3zsbKj0dMt+mQsyEsPYu7a03VRi5dV XXNPz7o5QvIb3nOaX77aKh2/VtFUHl8pQYLHbOYXy3f6JwJXZ3c+KNHpitJAnk9ZY3j8mbhj BXymIk0cFoTIFeK/ti3q0hoDAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrLLMWRmVeSWpSXmKPExsVy+t/xe7rRTitiDZ4u0LfYOGM9q8XUh0/Y LFZ/fMxoseDTDFaL8+c3sFtc3jWHzeJz7xFGixnn9zFZrD1yl93izY+zTBb/rm1ksdj84Bib A4/Hzll32T02repk8+jbsorR4/iN7UwenzfJBbBG6dkU5ZeWpCpk5BeX2CpFG1oY6RlaWugZ mVjqGRqbx1oZmSrp29mkpOZklqUW6dsl6GXMuPKAsaBTsGL720/MDYxz+LoYOTkkBEwkbu25 xNLFyMUhJLCUUWLOm+lsEAkZiZPTGlghbGGJP9e6wOJCAp8YJV72BoLYbAKGEl1vIeIiAokS D3qes4MMYhZ4wyRx6NEjoAQHh7CAm8SmH/4gNSwCqhJPnu4Fq+cVsJFYc/cD1C55idUbDjBP YORZwMiwilEktbQ4Nz232EivODG3uDQvXS85P3cTIzBotx37uWUHY9e74EOMAhyMSjy8L5iX xwqxJpYVV+YeYpTgYFYS4Z3fsiRWiDclsbIqtSg/vqg0J7X4EKMp0PKJzFKiyfnAiMoriTc0 NTS3sDQ0NzY3NrNQEuftEDgYIySQnliSmp2aWpBaBNPHxMEp1cC439in8vI6hZDl5/45P9kv /utM8qUFUrcaahzvGd0rfHjFweLVxDCDxu+vpLcb7Nv6vT9AYO3HN8dfn37dY3+a1TXz2GaH A5wTI/ZFJ87pLvxtLtkts3XdWc3IHdkb23+w/f385uL0XEc9q1W3noT8EF2YJbhi48NbBWvz VKN2X2GQrxWYkjClRomlOCPRUIu5qDgRAFRkTDxwAgAA X-CMS-MailID: 20191017102843eucas1p164993b3644d006481fb041e36175eebe X-Msg-Generator: CA X-RootMTR: 20191017102843eucas1p164993b3644d006481fb041e36175eebe X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20191017102843eucas1p164993b3644d006481fb041e36175eebe References: Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org All the drivers, which use the OPP framework control regulators, which are already enabled. Typically those regulators are also system critical, due to providing power to CPU core or system buses. It turned out that there are cases, where calling regulator_enable() on such boot-enabled regulator has side-effects and might change its initial voltage due to performing initial voltage balancing without all restrictions from the consumers. Until this issue becomes finally solved in regulator core, avoid calling regulator_enable()/disable() from the OPP framework. This reverts commit 7f93ff73f7c8c8bfa6be33bcc16470b0b44682aa. Signed-off-by: Marek Szyprowski --- This is a follow-up from the following discussion: https://lkml.org/lkml/2019/10/9/541 --- drivers/opp/core.c | 16 +++------------- 1 file changed, 3 insertions(+), 13 deletions(-) -- 2.17.1 diff --git a/drivers/opp/core.c b/drivers/opp/core.c index 3b7ffd0234e9..9ff0538ee83a 100644 --- a/drivers/opp/core.c +++ b/drivers/opp/core.c @@ -1626,12 +1626,6 @@ struct opp_table *dev_pm_opp_set_regulators(struct device *dev, goto free_regulators; } - ret = regulator_enable(reg); - if (ret < 0) { - regulator_put(reg); - goto free_regulators; - } - opp_table->regulators[i] = reg; } @@ -1645,10 +1639,8 @@ struct opp_table *dev_pm_opp_set_regulators(struct device *dev, return opp_table; free_regulators: - while (i--) { - regulator_disable(opp_table->regulators[i]); - regulator_put(opp_table->regulators[i]); - } + while (i != 0) + regulator_put(opp_table->regulators[--i]); kfree(opp_table->regulators); opp_table->regulators = NULL; @@ -1674,10 +1666,8 @@ void dev_pm_opp_put_regulators(struct opp_table *opp_table) /* Make sure there are no concurrent readers while updating opp_table */ WARN_ON(!list_empty(&opp_table->opp_list)); - for (i = opp_table->regulator_count - 1; i >= 0; i--) { - regulator_disable(opp_table->regulators[i]); + for (i = opp_table->regulator_count - 1; i >= 0; i--) regulator_put(opp_table->regulators[i]); - } _free_set_opp_data(opp_table);