From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Kamil Konieczny <k.konieczny@partner.samsung.com>,
Chanwoo Choi <cw00.choi@samsung.com>,
MyungJoo Ham <myungjoo.ham@samsung.com>,
Sasha Levin <sashal@kernel.org>,
linux-pm@vger.kernel.org, linux-samsung-soc@vger.kernel.org
Subject: [PATCH AUTOSEL 4.19 076/128] PM / devfreq: exynos-bus: Correct clock enable sequence
Date: Sun, 22 Sep 2019 14:53:26 -0400 [thread overview]
Message-ID: <20190922185418.2158-76-sashal@kernel.org> (raw)
In-Reply-To: <20190922185418.2158-1-sashal@kernel.org>
From: Kamil Konieczny <k.konieczny@partner.samsung.com>
[ Upstream commit 2c2b20e0da89c76759ee28c6824413ab2fa3bfc6 ]
Regulators should be enabled before clocks to avoid h/w hang. This
require change in exynos_bus_probe() to move exynos_bus_parse_of()
after exynos_bus_parent_parse_of() and change in error handling.
Similar change is needed in exynos_bus_exit() where clock should be
disabled before regulators.
Signed-off-by: Kamil Konieczny <k.konieczny@partner.samsung.com>
Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/devfreq/exynos-bus.c | 31 +++++++++++++++++--------------
1 file changed, 17 insertions(+), 14 deletions(-)
diff --git a/drivers/devfreq/exynos-bus.c b/drivers/devfreq/exynos-bus.c
index c25658b265988..24a9658348d78 100644
--- a/drivers/devfreq/exynos-bus.c
+++ b/drivers/devfreq/exynos-bus.c
@@ -194,11 +194,10 @@ static void exynos_bus_exit(struct device *dev)
if (ret < 0)
dev_warn(dev, "failed to disable the devfreq-event devices\n");
- if (bus->regulator)
- regulator_disable(bus->regulator);
-
dev_pm_opp_of_remove_table(dev);
clk_disable_unprepare(bus->clk);
+ if (bus->regulator)
+ regulator_disable(bus->regulator);
}
/*
@@ -386,6 +385,7 @@ static int exynos_bus_probe(struct platform_device *pdev)
struct exynos_bus *bus;
int ret, max_state;
unsigned long min_freq, max_freq;
+ bool passive = false;
if (!np) {
dev_err(dev, "failed to find devicetree node\n");
@@ -399,27 +399,27 @@ static int exynos_bus_probe(struct platform_device *pdev)
bus->dev = &pdev->dev;
platform_set_drvdata(pdev, bus);
- /* Parse the device-tree to get the resource information */
- ret = exynos_bus_parse_of(np, bus);
- if (ret < 0)
- return ret;
-
profile = devm_kzalloc(dev, sizeof(*profile), GFP_KERNEL);
- if (!profile) {
- ret = -ENOMEM;
- goto err;
- }
+ if (!profile)
+ return -ENOMEM;
node = of_parse_phandle(dev->of_node, "devfreq", 0);
if (node) {
of_node_put(node);
- goto passive;
+ passive = true;
} else {
ret = exynos_bus_parent_parse_of(np, bus);
+ if (ret < 0)
+ return ret;
}
+ /* Parse the device-tree to get the resource information */
+ ret = exynos_bus_parse_of(np, bus);
if (ret < 0)
- goto err;
+ goto err_reg;
+
+ if (passive)
+ goto passive;
/* Initialize the struct profile and governor data for parent device */
profile->polling_ms = 50;
@@ -510,6 +510,9 @@ static int exynos_bus_probe(struct platform_device *pdev)
err:
dev_pm_opp_of_remove_table(dev);
clk_disable_unprepare(bus->clk);
+err_reg:
+ if (!passive)
+ regulator_disable(bus->regulator);
return ret;
}
--
2.20.1
prev parent reply other threads:[~2019-09-22 19:16 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20190922185418.2158-1-sashal@kernel.org>
2019-09-22 18:53 ` [PATCH AUTOSEL 4.19 075/128] PM / devfreq: passive: Use non-devm notifiers Sasha Levin
2019-09-23 20:38 ` Leonard Crestez
2019-10-01 16:12 ` Sasha Levin
2019-09-22 18:53 ` Sasha Levin [this message]
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