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Date: Mon, 12 Oct 2020 21:57:23 +0800 From: Greentime Hu <greentime.hu@...ive.com> To: greentime.hu@...ive.com, tglx@...utronix.de, jason@...edaemon.net, maz@...nel.org, palmer@...belt.com, paul.walmsley@...ive.com, linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org Subject: [PATCH 1/2] irqchip/sifive-plic: Enable or disable interrupt based on its previous setting It will always enable the interrupt after calling plic_set_affinity() however it should set to its previous setting. Staying disabled or enabled. This patch can also fix this pwm hang issue in Unleashed board. [ 919.015783] rcu: INFO: rcu_sched detected stalls on CPUs/tasks: [ 919.020922] rcu: 0-...0: (0 ticks this GP) idle=7d2/1/0x4000000000000002 softirq=1424/1424 fqs=105807 [ 919.030295] (detected by 1, t=225825 jiffies, g=1561, q=3496) [ 919.036109] Task dump for CPU 0: [ 919.039321] kworker/0:1 R running task 0 30 2 0x00000008 [ 919.046359] Workqueue: events set_brightness_delayed [ 919.051302] Call Trace: [ 919.053738] [<ffffffe000930d92>] __schedule+0x194/0x4de [ 982.035783] rcu: INFO: rcu_sched detected stalls on CPUs/tasks: [ 982.040923] rcu: 0-...0: (0 ticks this GP) idle=7d2/1/0x4000000000000002 softirq=1424/1424 fqs=113325 [ 982.050294] (detected by 1, t=241580 jiffies, g=1561, q=3509) [ 982.056108] Task dump for CPU 0: [ 982.059321] kworker/0:1 R running task 0 30 2 0x00000008 [ 982.066359] Workqueue: events set_brightness_delayed [ 982.071302] Call Trace: [ 982.073739] [<ffffffe000930d92>] __schedule+0x194/0x4de [..] Fixes: bb0fed1c60cc ("irqchip/sifive-plic: Switch to fasteoi flow") Signed-off-by: Greentime Hu <greentime.hu@...ive.com> --- drivers/irqchip/irq-sifive-plic.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/irqchip/irq-sifive-plic.c b/drivers/irqchip/irq-sifive-plic.c index eaa3e9fe54e9..4cc8a2657a6d 100644 --- a/drivers/irqchip/irq-sifive-plic.c +++ b/drivers/irqchip/irq-sifive-plic.c @@ -137,6 +137,7 @@ static int plic_set_affinity(struct irq_data *d, const struct cpumask *mask_val, bool force) { unsigned int cpu; + bool enable; struct cpumask amask; struct plic_priv *priv = irq_get_chip_data(d->irq); @@ -150,8 +151,10 @@ static int plic_set_affinity(struct irq_data *d, if (cpu >= nr_cpu_ids) return -EINVAL; + enable = !irqd_irq_disabled(d); plic_irq_toggle(&priv->lmask, d, 0); - plic_irq_toggle(cpumask_of(cpu), d, 1); + /* Keep its original setting. */ + plic_irq_toggle(cpumask_of(cpu), d, enable); irq_data_update_effective_affinity(d, cpumask_of(cpu)); -- 2.28.0
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