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pinctrl/amd: fix gpio irq level in debugfs

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According to the AMD BKDG, the GPIO ActiveLevel bits (10:9) map to:
 00 Active High
 01 Active Low
 10 Active on both edges iff LevelTrig (bit 8) == 0
 11 Reserved

The current code has a bug where it interprets 00 => Active Low, and
01 => Active High.

Fix the bug, restrict "Active on both" to just the edge trigger case, and
refactor a bit to make the logic more readable.

Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Daniel Kurtz 2018-07-16 19:07:41 -06:00 committed by Linus Walleij
parent 2e25a9cbdf
commit 1766e4b704
2 changed files with 11 additions and 7 deletions
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14
drivers/pinctrl/pinctrl-amd.c
View File

@ -247,16 +247,16 @@ static void amd_gpio_dbg_show(struct seq_file *s, struct gpio_chip *gc)
raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
if (pin_reg & BIT(INTERRUPT_ENABLE_OFF)) {
u8 level = (pin_reg >> ACTIVE_LEVEL_OFF) &
ACTIVE_LEVEL_MASK;
interrupt_enable = "interrupt is enabled|";
if (!(pin_reg & BIT(ACTIVE_LEVEL_OFF)) &&
!(pin_reg & BIT(ACTIVE_LEVEL_OFF + 1)))
active_level = "Active low|";
else if (pin_reg & BIT(ACTIVE_LEVEL_OFF) &&
!(pin_reg & BIT(ACTIVE_LEVEL_OFF + 1)))
if (level == ACTIVE_LEVEL_HIGH)
active_level = "Active high|";
else if (!(pin_reg & BIT(ACTIVE_LEVEL_OFF)) &&
pin_reg & BIT(ACTIVE_LEVEL_OFF + 1))
else if (level == ACTIVE_LEVEL_LOW)
active_level = "Active low|";
else if (!(pin_reg & BIT(LEVEL_TRIG_OFF)) &&
level == ACTIVE_LEVEL_BOTH)
active_level = "Active on both|";
else
active_level = "Unknown Active level|";

4
drivers/pinctrl/pinctrl-amd.h
View File

@ -54,6 +54,10 @@
#define ACTIVE_LEVEL_MASK 0x3UL
#define DRV_STRENGTH_SEL_MASK 0x3UL
#define ACTIVE_LEVEL_HIGH 0x0UL
#define ACTIVE_LEVEL_LOW 0x1UL
#define ACTIVE_LEVEL_BOTH 0x2UL
#define DB_TYPE_NO_DEBOUNCE 0x0UL
#define DB_TYPE_PRESERVE_LOW_GLITCH 0x1UL
#define DB_TYPE_PRESERVE_HIGH_GLITCH 0x2UL