From 1766e4b7047acf44cdd15aaeb1d63ed76ee78492 Mon Sep 17 00:00:00 2001
From: Daniel Kurtz <djkurtz@chromium.org>
Date: Mon, 16 Jul 2018 19:07:41 -0600
Subject: [PATCH] pinctrl/amd: fix gpio irq level in debugfs
Git-commit: 1766e4b7047acf44cdd15aaeb1d63ed76ee78492
Patch-mainline: v4.19-rc1
References: bsc#1140463
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>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/pinctrl/pinctrl-amd.c | 14 +++++++-------
drivers/pinctrl/pinctrl-amd.h | 4 ++++
2 files changed, 11 insertions(+), 7 deletions(-)
diff --git a/drivers/pinctrl/pinctrl-amd.c b/drivers/pinctrl/pinctrl-amd.c
index 04ae139671c8..5df5e8d64c57 100644
--- a/drivers/pinctrl/pinctrl-amd.c
+++ b/drivers/pinctrl/pinctrl-amd.c
@@ -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|";
diff --git a/drivers/pinctrl/pinctrl-amd.h b/drivers/pinctrl/pinctrl-amd.h
index 8fa453a59da5..22af7edfdb38 100644
--- a/drivers/pinctrl/pinctrl-amd.h
+++ b/drivers/pinctrl/pinctrl-amd.h
@@ -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
--
2.16.4