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From: Jernej Skrabec <jernej.skrabec@gmail.com>
To: mripard@kernel.org, wens@csie.org
Cc: samuel@sholland.org, linux-arm-kernel@lists.infradead.org,
	linux-sunxi@lists.linux.dev, linux-kernel@vger.kernel.org,
	Jernej Skrabec <jernej.skrabec@gmail.com>
Subject: [PATCH] bus: sunxi-rsb: Fix shutdown
Date: Sun, 21 Nov 2021 09:35:37 +0100	[thread overview]
Message-ID: <20211121083537.612473-1-jernej.skrabec@gmail.com> (raw)

Function sunxi_rsb_hw_exit() is sometimes called with pm runtime
disabled, so in such cases pm_runtime_resume() will fail with -EACCES.

Instead of doing whole dance of enabling pm runtime and thus clock just
to disable it again immediately, just check if disabling clock is
needed. That way calling pm_runtime_resume() is not needed at all.

Fixes: 4a0dbc12e618 ("bus: sunxi-rsb: Implement runtime power management")
Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>
---
 drivers/bus/sunxi-rsb.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/bus/sunxi-rsb.c b/drivers/bus/sunxi-rsb.c
index 6f225dddc74f..4566e730ef2b 100644
--- a/drivers/bus/sunxi-rsb.c
+++ b/drivers/bus/sunxi-rsb.c
@@ -687,11 +687,11 @@ static int sunxi_rsb_hw_init(struct sunxi_rsb *rsb)
 
 static void sunxi_rsb_hw_exit(struct sunxi_rsb *rsb)
 {
-	/* Keep the clock and PM reference counts consistent. */
-	if (pm_runtime_status_suspended(rsb->dev))
-		pm_runtime_resume(rsb->dev);
 	reset_control_assert(rsb->rstc);
-	clk_disable_unprepare(rsb->clk);
+
+	/* Keep the clock and PM reference counts consistent. */
+	if (!pm_runtime_status_suspended(rsb->dev))
+		clk_disable_unprepare(rsb->clk);
 }
 
 static int __maybe_unused sunxi_rsb_runtime_suspend(struct device *dev)
-- 
2.34.0


WARNING: multiple messages have this Message-ID (diff)
From: Jernej Skrabec <jernej.skrabec@gmail.com>
To: mripard@kernel.org, wens@csie.org
Cc: samuel@sholland.org, linux-arm-kernel@lists.infradead.org,
	linux-sunxi@lists.linux.dev, linux-kernel@vger.kernel.org,
	Jernej Skrabec <jernej.skrabec@gmail.com>
Subject: [PATCH] bus: sunxi-rsb: Fix shutdown
Date: Sun, 21 Nov 2021 09:35:37 +0100	[thread overview]
Message-ID: <20211121083537.612473-1-jernej.skrabec@gmail.com> (raw)

Function sunxi_rsb_hw_exit() is sometimes called with pm runtime
disabled, so in such cases pm_runtime_resume() will fail with -EACCES.

Instead of doing whole dance of enabling pm runtime and thus clock just
to disable it again immediately, just check if disabling clock is
needed. That way calling pm_runtime_resume() is not needed at all.

Fixes: 4a0dbc12e618 ("bus: sunxi-rsb: Implement runtime power management")
Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>
---
 drivers/bus/sunxi-rsb.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/bus/sunxi-rsb.c b/drivers/bus/sunxi-rsb.c
index 6f225dddc74f..4566e730ef2b 100644
--- a/drivers/bus/sunxi-rsb.c
+++ b/drivers/bus/sunxi-rsb.c
@@ -687,11 +687,11 @@ static int sunxi_rsb_hw_init(struct sunxi_rsb *rsb)
 
 static void sunxi_rsb_hw_exit(struct sunxi_rsb *rsb)
 {
-	/* Keep the clock and PM reference counts consistent. */
-	if (pm_runtime_status_suspended(rsb->dev))
-		pm_runtime_resume(rsb->dev);
 	reset_control_assert(rsb->rstc);
-	clk_disable_unprepare(rsb->clk);
+
+	/* Keep the clock and PM reference counts consistent. */
+	if (!pm_runtime_status_suspended(rsb->dev))
+		clk_disable_unprepare(rsb->clk);
 }
 
 static int __maybe_unused sunxi_rsb_runtime_suspend(struct device *dev)
-- 
2.34.0


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             reply	other threads:[~2021-11-21  8:35 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-21  8:35 Jernej Skrabec [this message]
2021-11-21  8:35 ` [PATCH] bus: sunxi-rsb: Fix shutdown Jernej Skrabec
2021-11-22  9:07 ` Maxime Ripard
2021-11-22  9:07   ` Maxime Ripard

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