linux-kernel - [PATCH 1/3] phy: core: Invoke pm_runtime_get_*/pm_runtime_put

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Date:   Mon, 21 Jan 2019 12:18:11 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Kishon Vijay Abraham I <kishon@...com>,
        Rob Herring <robh+dt@...nel.org>
CC:     Sekhar Nori <nsekhar@...com>, Roger Quadros <rogerq@...com>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: [PATCH 1/3] phy: core: Invoke pm_runtime_get_*/pm_runtime_put_* before invoking reset callback

PHY drivers may try to access PHY registers in the ->reset() callback.
Invoke phy_pm_runtime_get_sync() before invoking the ->reset() callback
so that the PHY drivers don't have to enable clocks by themselves before
accessing PHY registers.

Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
---
 drivers/phy/phy-core.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
index 19b05e824ee4..bf3a1fc18117 100644
--- a/drivers/phy/phy-core.c
+++ b/drivers/phy/phy-core.c
@@ -384,10 +384,16 @@ int phy_reset(struct phy *phy)
 	if (!phy || !phy->ops->reset)
 		return 0;
 
+	ret = phy_pm_runtime_get_sync(phy);
+	if (ret < 0 && ret != -ENOTSUPP)
+		return ret;
+
 	mutex_lock(&phy->mutex);
 	ret = phy->ops->reset(phy);
 	mutex_unlock(&phy->mutex);
 
+	phy_pm_runtime_put(phy);
+
 	return ret;
 }
 EXPORT_SYMBOL_GPL(phy_reset);
-- 
2.17.1