linux-kernel - [PATCH v2] mfd: axp20x: fix order of pek rise and fall events

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Message-Id: <20221208220225.635414-1-aren@peacevolution.org>
Date:   Thu,  8 Dec 2022 17:02:26 -0500
From:   Aren Moynihan <aren@...cevolution.org>
To:     Lee Jones <lee@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        linux-kernel@...r.kernel.org
Cc:     Ondrej Jirman <megi@....cz>, Samuel Holland <samuel@...lland.org>,
        Aren Moynihan <aren@...cevolution.org>
Subject: [PATCH v2] mfd: axp20x: fix order of pek rise and fall events

The power button can get "stuck" if the rising edge and falling edge irq
are read in the same pass. This can often be triggered when resuming
from suspend if the power button is released before the kernel handles
the interrupt.

Swapping the order of the rise and fall events makes sure that the press
event is handled first, which prevents this situation.

Signed-off-by: Aren Moynihan <aren@...cevolution.org>
---
changes in v2:
  - add comments describing the reason these are out of bit order

previous version:
https://lore.kernel.org/lkml/20221123230741.2430813-1-aren@peacevolution.org/T/

 include/linux/mfd/axp20x.h | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/include/linux/mfd/axp20x.h b/include/linux/mfd/axp20x.h
index 9ab0e2fca7ea..2058194807bd 100644
--- a/include/linux/mfd/axp20x.h
+++ b/include/linux/mfd/axp20x.h
@@ -432,8 +432,9 @@ enum {
 	AXP152_IRQ_PEK_SHORT,
 	AXP152_IRQ_PEK_LONG,
 	AXP152_IRQ_TIMER,
-	AXP152_IRQ_PEK_RIS_EDGE,
+	/* out of bit order to make sure the press event is handled first */
 	AXP152_IRQ_PEK_FAL_EDGE,
+	AXP152_IRQ_PEK_RIS_EDGE,
 	AXP152_IRQ_GPIO3_INPUT,
 	AXP152_IRQ_GPIO2_INPUT,
 	AXP152_IRQ_GPIO1_INPUT,
@@ -472,8 +473,9 @@ enum {
 	AXP20X_IRQ_LOW_PWR_LVL1,
 	AXP20X_IRQ_LOW_PWR_LVL2,
 	AXP20X_IRQ_TIMER,
-	AXP20X_IRQ_PEK_RIS_EDGE,
+	/* out of bit order to make sure the press event is handled first */
 	AXP20X_IRQ_PEK_FAL_EDGE,
+	AXP20X_IRQ_PEK_RIS_EDGE,
 	AXP20X_IRQ_GPIO3_INPUT,
 	AXP20X_IRQ_GPIO2_INPUT,
 	AXP20X_IRQ_GPIO1_INPUT,
@@ -502,8 +504,9 @@ enum axp22x_irqs {
 	AXP22X_IRQ_LOW_PWR_LVL1,
 	AXP22X_IRQ_LOW_PWR_LVL2,
 	AXP22X_IRQ_TIMER,
-	AXP22X_IRQ_PEK_RIS_EDGE,
+	/* out of bit order to make sure the press event is handled first */
 	AXP22X_IRQ_PEK_FAL_EDGE,
+	AXP22X_IRQ_PEK_RIS_EDGE,
 	AXP22X_IRQ_GPIO1_INPUT,
 	AXP22X_IRQ_GPIO0_INPUT,
 };
@@ -571,8 +574,9 @@ enum axp803_irqs {
 	AXP803_IRQ_LOW_PWR_LVL1,
 	AXP803_IRQ_LOW_PWR_LVL2,
 	AXP803_IRQ_TIMER,
-	AXP803_IRQ_PEK_RIS_EDGE,
+	/* out of bit order to make sure the press event is handled first */
 	AXP803_IRQ_PEK_FAL_EDGE,
+	AXP803_IRQ_PEK_RIS_EDGE,
 	AXP803_IRQ_PEK_SHORT,
 	AXP803_IRQ_PEK_LONG,
 	AXP803_IRQ_PEK_OVER_OFF,
@@ -623,8 +627,9 @@ enum axp809_irqs {
 	AXP809_IRQ_LOW_PWR_LVL1,
 	AXP809_IRQ_LOW_PWR_LVL2,
 	AXP809_IRQ_TIMER,
-	AXP809_IRQ_PEK_RIS_EDGE,
+	/* out of bit order to make sure the press event is handled first */
 	AXP809_IRQ_PEK_FAL_EDGE,
+	AXP809_IRQ_PEK_RIS_EDGE,
 	AXP809_IRQ_PEK_SHORT,
 	AXP809_IRQ_PEK_LONG,
 	AXP809_IRQ_PEK_OVER_OFF,
-- 
2.38.1