linux-kernel - [PATCH 5.4 311/434] regulator: core: Let boot-on regulators be powered off

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Date:   Sun, 29 Dec 2019 18:26:04 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Pascal Paillet <p.paillet@...com>,
        Mark Brown <broonie@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 311/434] regulator: core: Let boot-on regulators be powered off

From: Pascal Paillet <p.paillet@...com>

[ Upstream commit 089b3f61ecfc43ca4ea26d595e1d31ead6de3f7b ]

Boot-on regulators are always kept on because their use_count value
is now incremented at boot time and never cleaned.

Only increment count value for alway-on regulators.
regulator_late_cleanup() is now able to power off boot-on regulators
when unused.

Fixes: 05f224ca6693 ("regulator: core: Clean enabling always-on regulators + their supplies")
Signed-off-by: Pascal Paillet <p.paillet@...com>
Link: https://lore.kernel.org/r/20191113102737.27831-1-p.paillet@st.com
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/regulator/core.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 51ce280c1ce1..87bc06b386a0 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1403,7 +1403,9 @@ static int set_machine_constraints(struct regulator_dev *rdev,
 			rdev_err(rdev, "failed to enable\n");
 			return ret;
 		}
-		rdev->use_count++;
+
+		if (rdev->constraints->always_on)
+			rdev->use_count++;
 	}
 
 	print_constraints(rdev);
-- 
2.20.1