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pinctrl: amd: print debounce filter info in debugfs 

Print the status of debounce filter as follows,

$ cat /sys/kernel/debug/gpio
pin129 interrupt is disabled | interrupt is masked |
  disable wakeup in S0i3 state | disable wakeup in S3 state |
  disable wakeup in S4/S5 state| input is high | pull-up is disabled |
  Pull-down is disabled | output is disabled |
  debouncing filter disabled | 0x50000

pin130 interrupt is disabled | interrupt is masked |
  disable wakeup in S0i3 state | disable wakeup in S3 state |
  disable wakeup in S4/S5 state | input is high | pull-up is disabled |
  Pull-down is disabled | output is disabled |
  debouncing filter (high) enabled |
  debouncing timeout is 124800 (us)| 0x503c8

Signed-off-by: Coiby Xu <coiby.xu@gmail.com>
Link: https://lore.kernel.org/r/20201105231912.69527-4-coiby.xu@gmail.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Coiby Xu 2020-11-06 07:19:11 +08:00 committed by Linus Walleij
parent 016e054d69
commit 39cc1d3397
1 changed files with 41 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

43
drivers/pinctrl/pinctrl-amd.c
View File

@ -197,10 +197,16 @@ static int amd_gpio_set_config(struct gpio_chip *gc, unsigned offset,
static void amd_gpio_dbg_show(struct seq_file *s, struct gpio_chip *gc)
{
u32 pin_reg;
u32 db_cntrl;
unsigned long flags;
unsigned int bank, i, pin_num;
struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
bool tmr_out_unit;
unsigned int time;
unsigned int unit;
bool tmr_large;
char *level_trig;
char *active_level;
char *interrupt_enable;
@ -214,6 +220,8 @@ static void amd_gpio_dbg_show(struct seq_file *s, struct gpio_chip *gc)
char *pull_down_enable;
char *output_value;
char *output_enable;
char debounce_value[40];
char *debounce_enable;
for (bank = 0; bank < gpio_dev->hwbank_num; bank++) {
seq_printf(s, "GPIO bank%d\t", bank);
@ -327,13 +335,44 @@ static void amd_gpio_dbg_show(struct seq_file *s, struct gpio_chip *gc)
pin_sts = "input is low|";
}
db_cntrl = (DB_CNTRl_MASK << DB_CNTRL_OFF) & pin_reg;
if (db_cntrl) {
tmr_out_unit = pin_reg & BIT(DB_TMR_OUT_UNIT_OFF);
tmr_large = pin_reg & BIT(DB_TMR_LARGE_OFF);
time = pin_reg & DB_TMR_OUT_MASK;
if (tmr_large) {
if (tmr_out_unit)
unit = 62500;
else
unit = 15625;
} else {
if (tmr_out_unit)
unit = 244;
else
unit = 61;
}
if ((DB_TYPE_REMOVE_GLITCH << DB_CNTRL_OFF) == db_cntrl)
debounce_enable = "debouncing filter (high and low) enabled|";
else if ((DB_TYPE_PRESERVE_LOW_GLITCH << DB_CNTRL_OFF) == db_cntrl)
debounce_enable = "debouncing filter (low) enabled|";
else
debounce_enable = "debouncing filter (high) enabled|";
snprintf(debounce_value, sizeof(debounce_value),
"debouncing timeout is %u (us)|", time * unit);
} else {
debounce_enable = "debouncing filter disabled|";
snprintf(debounce_value, sizeof(debounce_value), " ");
}
seq_printf(s, "%s %s %s %s %s %s\n"
" %s %s %s %s %s %s %s 0x%x\n",
" %s %s %s %s %s %s %s %s %s 0x%x\n",
level_trig, active_level, interrupt_enable,
interrupt_mask, wake_cntrl0, wake_cntrl1,
wake_cntrl2, pin_sts, pull_up_sel,
pull_up_enable, pull_down_enable,
output_value, output_enable, pin_reg);
output_value, output_enable,
debounce_enable, debounce_value, pin_reg);
}
}
}