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Message-ID: <20251012091000.1160751-1-niklas.soderlund+renesas@ragnatech.se>
Date: Sun, 12 Oct 2025 11:10:00 +0200
From: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>
To: Daniel Lezcano <daniel.lezcano@...aro.org>,
Thomas Gleixner <tglx@...utronix.de>,
Geert Uytterhoeven <geert@...ux-m68k.org>,
linux-kernel@...r.kernel.org,
linux-renesas-soc@...r.kernel.org
Cc: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>
Subject: [RFC] clocksource/drivers/sh_cmt: Always leave device running after probe
The CMT device can be used as both a clocksource and a clockevent
provider. The driver tries to be smart and power itself on and off, as
well as enabling and disabling its clock when it's not in operation.
This behavior is slightly altered if the CMT is used as an early
platform device in which case the device is left powered on after probe,
but the clock is still enabled and disabled at runtime.
This have worked for a long time, but recent improvements in PREEMPT_RT
and PROVE_LOCKING have highlighted an issue. As the CMT register itself
as a clockevent provided, clockevents_register_device(), it needs to use
raw spinlocks internally as this is the context of which the clockevent
framework interacts with the CMT driver. However in the context of
holding a raw spinlock the CMT driver can't really manage its power
state or clock with calls to pm_runtime_*() and clk_*() as these calls
end up in other platform drivers using regular spinlocks to control
power and clocks.
This mix of spinlock contexts trips a lockdep warning.
=============================
[ BUG: Invalid wait context ]
6.17.0-rc3-arm64-renesas-03071-gb3c4f4122b28-dirty #21 Not tainted
-----------------------------
swapper/1/0 is trying to lock:
ffff00000898d180 (&dev->power.lock){-...}-{3:3}, at: __pm_runtime_resume+0x38/0x88
ccree e6601000.crypto: ARM CryptoCell 630P Driver: HW version 0xAF400001/0xDCC63000, Driver version 5.0
other info that might help us debug this:
ccree e6601000.crypto: ARM ccree device initialized
context-{5:5}
2 locks held by swapper/1/0:
#0: ffff80008173c298 (tick_broadcast_lock){-...}-{2:2}, at: __tick_broadcast_oneshot_control+0xa4/0x3a8
#1: ffff0000089a5858 (&ch->lock){....}-{2:2}
usbcore: registered new interface driver usbhid
, at: sh_cmt_start+0x30/0x364
stack backtrace:
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted 6.17.0-rc3-arm64-renesas-03071-gb3c4f4122b28-dirty #21 PREEMPT
Hardware name: Renesas Salvator-X 2nd version board based on r8a77965 (DT)
Call trace:
show_stack+0x14/0x1c (C)
dump_stack_lvl+0x6c/0x90
dump_stack+0x14/0x1c
__lock_acquire+0x904/0x1584
lock_acquire+0x220/0x34c
_raw_spin_lock_irqsave+0x58/0x80
__pm_runtime_resume+0x38/0x88
sh_cmt_start+0x54/0x364
sh_cmt_clock_event_set_oneshot+0x64/0xb8
clockevents_switch_state+0xfc/0x13c
tick_broadcast_set_event+0x30/0xa4
__tick_broadcast_oneshot_control+0x1e0/0x3a8
tick_broadcast_oneshot_control+0x30/0x40
cpuidle_enter_state+0x40c/0x680
cpuidle_enter+0x30/0x40
do_idle+0x1f4/0x26c
cpu_startup_entry+0x34/0x40
secondary_start_kernel+0x11c/0x13c
__secondary_switched+0x74/0x78
For non-PREEMPT_RT builds this is not really an issue, but for
PREEMPT_RT builds where normal spinlocks can sleep this might be an
issue. Be cautious and always leave the power and clock running after
probe.
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>
---
---
drivers/clocksource/sh_cmt.c | 29 +----------------------------
1 file changed, 1 insertion(+), 28 deletions(-)
diff --git a/drivers/clocksource/sh_cmt.c b/drivers/clocksource/sh_cmt.c
index 385eb94bbe7c..f4d4a8f7c6aa 100644
--- a/drivers/clocksource/sh_cmt.c
+++ b/drivers/clocksource/sh_cmt.c
@@ -355,14 +355,6 @@ static int sh_cmt_enable(struct sh_cmt_channel *ch)
dev_pm_syscore_device(&ch->cmt->pdev->dev, true);
- /* enable clock */
- ret = clk_enable(ch->cmt->clk);
- if (ret) {
- dev_err(&ch->cmt->pdev->dev, "ch%u: cannot enable clock\n",
- ch->index);
- goto err0;
- }
-
/* make sure channel is disabled */
sh_cmt_start_stop_ch(ch, 0);
@@ -385,18 +377,12 @@ static int sh_cmt_enable(struct sh_cmt_channel *ch)
dev_err(&ch->cmt->pdev->dev, "ch%u: cannot clear CMCNT\n",
ch->index);
ret = -ETIMEDOUT;
- goto err1;
+ return ret;
}
/* enable channel */
sh_cmt_start_stop_ch(ch, 1);
return 0;
- err1:
- /* stop clock */
- clk_disable(ch->cmt->clk);
-
- err0:
- return ret;
}
static void sh_cmt_disable(struct sh_cmt_channel *ch)
@@ -407,9 +393,6 @@ static void sh_cmt_disable(struct sh_cmt_channel *ch)
/* disable interrupts in CMT block */
sh_cmt_write_cmcsr(ch, 0);
- /* stop clock */
- clk_disable(ch->cmt->clk);
-
dev_pm_syscore_device(&ch->cmt->pdev->dev, false);
}
@@ -583,8 +566,6 @@ static int sh_cmt_start_clocksource(struct sh_cmt_channel *ch)
int ret = 0;
unsigned long flags;
- pm_runtime_get_sync(&ch->cmt->pdev->dev);
-
raw_spin_lock_irqsave(&ch->lock, flags);
if (!(ch->flags & (FLAG_CLOCKEVENT | FLAG_CLOCKSOURCE)))
@@ -619,8 +600,6 @@ static void sh_cmt_stop_clocksource(struct sh_cmt_channel *ch)
sh_cmt_disable(ch);
raw_spin_unlock_irqrestore(&ch->lock, flags);
-
- pm_runtime_put(&ch->cmt->pdev->dev);
}
static int sh_cmt_start_clockevent(struct sh_cmt_channel *ch)
@@ -631,7 +610,6 @@ static int sh_cmt_start_clockevent(struct sh_cmt_channel *ch)
raw_spin_lock_irqsave(&ch->lock, flags);
if (!(ch->flags & (FLAG_CLOCKEVENT | FLAG_CLOCKSOURCE))) {
- pm_runtime_get_sync(&ch->cmt->pdev->dev);
ret = sh_cmt_enable(ch);
}
@@ -658,7 +636,6 @@ static void sh_cmt_stop_clockevent(struct sh_cmt_channel *ch)
if (f && !(ch->flags & (FLAG_CLOCKEVENT | FLAG_CLOCKSOURCE))) {
sh_cmt_disable(ch);
- pm_runtime_put(&ch->cmt->pdev->dev);
}
/* adjust the timeout to maximum if only clocksource left */
@@ -1134,8 +1111,6 @@ static int sh_cmt_setup(struct sh_cmt_device *cmt, struct platform_device *pdev)
mask &= ~(1 << hwidx);
}
- clk_disable(cmt->clk);
-
platform_set_drvdata(pdev, cmt);
return 0;
@@ -1183,8 +1158,6 @@ static int sh_cmt_probe(struct platform_device *pdev)
out:
if (cmt->has_clockevent || cmt->has_clocksource)
pm_runtime_irq_safe(&pdev->dev);
- else
- pm_runtime_idle(&pdev->dev);
return 0;
}
--
2.51.0
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