Question :
When you see the log "Flags mismatch irq ............", maybe you use the same irq number to register different interrupt handler .
irq number ---> handler_1
|
|--> handler_2
|
|--> handler_3
|
|--> handler_4
log
01-01 00:00:17.887 I/SMBCHG ( 0): ovp_handler_init: chip->cd_ac_acok_n_gpio_irq = 101
01-01 00:00:17.893 E/genirq ( 0): Flags mismatch irq 101. 00002003 (cd_ac_acok_n) vs. 00002003 (cd_acok_n_irq_1)
01-01 00:00:17.902 I/SMBCHG ( 0): ovp_handler_init: request irq cd_ac_acok_nerror.void xxx_init(void)
{
...
...
chip->cd_ac_acok_n_gpio_irq = gpio_to_irq(chip->cd_ac_acok_n_gpio_number);
pr_err("chip->cd_ac_acok_n_gpio_irq = %d\n", chip->cd_ac_acok_n_gpio_irq);
rc = request_irq(chip->cd_ac_acok_n_gpio_irq,
cd_ac_acok_n_gpio_isr,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
"cd_acok_n_irq_1",
chip);
...
...
}void yyy_init(void)
{
...
...
rc = request_irq(chip->cd_ac_acok_n_gpio_irq
handler_name,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
"cd_ac_acok_n",
chip);
...
...
}...
...
/*
* Can't share interrupts unless both agree to and are
* the same type (level, edge, polarity). So both flag
* fields must have IRQF_SHARED set and the bits which
* set the trigger type must match. Also all must
* agree on ONESHOT.
*/
if (!((old->flags & new->flags) & IRQF_SHARED) ||
((old->flags ^ new->flags) & IRQF_TRIGGER_MASK) ||
((old->flags ^ new->flags) & IRQF_ONESHOT))
goto mismatch;
...
...
mismatch:
if (!(new->flags & IRQF_PROBE_SHARED)) {
pr_err("Flags mismatch irq %d. %08x (%s) vs. %08x (%s)\n",
irq, new->flags, new->name, old->flags, old->name);
#ifdef CONFIG_DEBUG_SHIRQ
dump_stack();
#endif
}
...
...android/kernel/msm-3.18/kernel/irq/manage.c
Solve :
If you want to use the same irq number to register different interrupt handler, please use IRQ_SHARED flags.
void xxx_init(void)
{
...
...
chip->cd_ac_acok_n_gpio_irq = gpio_to_irq(chip->cd_ac_acok_n_gpio_number);
pr_err("chip->cd_ac_acok_n_gpio_irq = %d\n", chip->cd_ac_acok_n_gpio_irq);
rc = request_irq(chip->cd_ac_acok_n_gpio_irq, cd_ac_acok_n_gpio_isr,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT | IRQF_SHARED ,
"cd_acok_n_irq_1",
chip);
...
...
}void yyy_init(void)
{
...
...
rc = request_irq(chip->cd_ac_acok_n_gpio_irq
handler_name,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT | IRQF_SHARED,
"cd_ac_acok_n",
chip);
...
...
}Extension 1 :
If you register isr successful, the system has related information in /proc/interrupts
adb root
adb shell
cat /proc/interrupts
The first column is irq number.
The second ~ fifth column is the number of some cpu that execute isr.
The sixth ~ 7th is the source of hardware.
The 8th is isr or handler name.
The below code respond to the last row of the above picture
irq_number = gpio_to_irq(48);
rc = request_irq(irq_number, // 55
isr_1,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT | IRQ_SHARED,
"cd_acok_n_irq",
chip);
rc = request_irq(irq_number, // 55
isr_2,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT | IRQ_SHARED,
"cd_acok_n",
chip);