From: stefan.wahren@i2se•com (Stefan Wahren)
To: linux-arm-kernel@lists•infradead.org
Subject: MX28: leds/pwm: Using pwm driven led as heartbeat leads to kernel warning
Date: Thu, 27 Mar 2014 18:14:59 +0100 [thread overview]
Message-ID: <53345C93.9040005@i2se.com> (raw)
Hello,
i'm using a i.MX28 custom board with two leds and Kernel 3.14-rc5.
Here is the relevant dts part:
pwmleds {
compatible = "pwm-leds";
pinctrl-names = "default";
pinctrl-0 = <&pwm0_pins_b>; /* MX28_PAD_AUART1_RX__PWM_0 */
led0 {
label = "duckbill:red";
pwms = <&pwm 0 7812500>;
max-brightness = <127>;
linux,default-trigger = "none";
};
};
gpioleds {
compatible = "gpio-leds";
pinctrl-names = "default";
pinctrl-0 = <&led_pins>;
led1 {
label = "duckbill:green";
gpios = <&gpio3 5 0>;
linux,default-trigger = "heartbeat";
};
};
The gpio driven led works perfect as heartbeat. But if i change the
trigger of the pwm
driven led from none to heartbeat, it results always in a kernel warning
and the pwm led
keeps on:
[ 248.916168] WARNING: CPU: 0 PID: 0 at kernel/locking/mutex.c:856
mutex_trylock+0x184/0x1a4()
[ 248.924745] DEBUG_LOCKS_WARN_ON(in_interrupt())
[ 248.929136] Modules linked in:
[ 248.932517] CPU: 0 PID: 0 Comm: swapper Not tainted 3.14.0-rc5 #18
[ 248.938781] [<c0015420>] (unwind_backtrace) from [<c0012cb0>]
(show_stack+0x10/0x14)
[ 248.946672] [<c0012cb0>] (show_stack) from [<c001daf8>]
(warn_slowpath_common+0x6c/0x8c)
[ 248.954902] [<c001daf8>] (warn_slowpath_common) from [<c001dbac>]
(warn_slowpath_fmt+0x30/0x40)
[ 248.963742] [<c001dbac>] (warn_slowpath_fmt) from [<c045df74>]
(mutex_trylock+0x184/0x1a4)
[ 248.972147] [<c045df74>] (mutex_trylock) from [<c0360950>]
(clk_prepare_lock+0xc/0xec)
[ 248.980132] [<c0360950>] (clk_prepare_lock) from [<c0362020>]
(clk_get_rate+0xc/0x68)
[ 248.988105] [<c0362020>] (clk_get_rate) from [<c028d07c>]
(mxs_pwm_config+0x20/0x198)
[ 248.996098] [<c028d07c>] (mxs_pwm_config) from [<c028bde8>]
(pwm_config+0x60/0x70)
[ 249.003824] [<c028bde8>] (pwm_config) from [<c034b61c>]
(__led_pwm_set+0x1c/0x3c)
[ 249.011442] [<c034b61c>] (__led_pwm_set) from [<c034bc3c>]
(led_heartbeat_function+0x70/0x110)
[ 249.020114] [<c034bc3c>] (led_heartbeat_function) from [<c00292f0>]
(call_timer_fn+0x7c/0x164)
[ 249.028856] [<c00292f0>] (call_timer_fn) from [<c00295c8>]
(run_timer_softirq+0x1f0/0x260)
[ 249.037267] [<c00295c8>] (run_timer_softirq) from [<c002255c>]
(__do_softirq+0xc4/0x2f0)
[ 249.045507] [<c002255c>] (__do_softirq) from [<c0022890>]
(irq_exit+0xa4/0x10c)
[ 249.052966] [<c0022890>] (irq_exit) from [<c0010240>]
(handle_IRQ+0x34/0x84)
[ 249.060079] [<c0010240>] (handle_IRQ) from [<c0013524>]
(__irq_svc+0x44/0x54)
[ 249.067358] [<c0013524>] (__irq_svc) from [<c00107f8>]
(arch_cpu_idle+0x40/0x48)
[ 249.074916] [<c00107f8>] (arch_cpu_idle) from [<c005deb8>]
(cpu_startup_entry+0x70/0x198)
[ 249.083258] [<c005deb8>] (cpu_startup_entry) from [<c060aac8>]
(start_kernel+0x2a8/0x2f8)
Best regards
Stefan Wahren
next reply other threads:[~2014-03-27 17:14 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-27 17:14 Stefan Wahren [this message]
2014-04-04 13:54 ` MX28: leds/pwm: Using pwm driven led as heartbeat leads to kernel warning Stefan Wahren
2014-04-04 14:26 ` Shawn Guo
2014-04-04 15:25 ` Stefan Wahren
2014-04-04 16:44 ` Alexandre Belloni
2014-04-08 7:34 ` Shawn Guo
2014-04-08 7:59 ` Alexandre Belloni
2014-04-08 8:18 ` Shawn Guo
2014-04-08 8:41 ` Alexandre Belloni
2014-04-08 8:49 ` Shawn Guo
2014-04-08 9:04 ` Alexandre Belloni
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