linux-kernel - [PATCH 3/3] pinctrl: amd: Add a quirk for Lenovo Ideapad 5

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Date:   Tue, 29 Aug 2023 11:56:27 -0500
From:   Mario Limonciello <mario.limonciello@....com>
To:     <linus.walleij@...aro.org>
CC:     <Shyam-sundar.S-k@....com>, <Basavaraj.Natikar@....com>,
        <linux-gpio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <regressions@...ts.linux.dev>, <lucapgl2001@...il.com>,
        Mario Limonciello <mario.limonciello@....com>
Subject: [PATCH 3/3] pinctrl: amd: Add a quirk for Lenovo Ideapad 5

Lenovo ideapad 5 doesn't use interrupts for GPIO 0, and so internally
debouncing with WinBlue debounce behavior means that the GPIO doesn't
clear until a separate GPIO is used (such as touchpad).

Prefer to use legacy debouncing to avoid problems.

Reported-by: Luca Pigliacampo <lucapgl2001@...il.com>
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=217833
Signed-off-by: Mario Limonciello <mario.limonciello@....com>
---
 drivers/pinctrl/pinctrl-amd.c | 34 ++++++++++++++++++++++++++++++++--
 1 file changed, 32 insertions(+), 2 deletions(-)

diff --git a/drivers/pinctrl/pinctrl-amd.c b/drivers/pinctrl/pinctrl-amd.c
index a2468a988be3..2e1721a9249a 100644
--- a/drivers/pinctrl/pinctrl-amd.c
+++ b/drivers/pinctrl/pinctrl-amd.c
@@ -8,6 +8,7 @@
  *
  */
 
+#include <linux/dmi.h>
 #include <linux/err.h>
 #include <linux/bug.h>
 #include <linux/kernel.h>
@@ -41,6 +42,27 @@ module_param(powerbtn, int, 0444);
 MODULE_PARM_DESC(powerbtn,
 		 "Power button debouncing: 0=traditional, 1=windows, -1=auto");
 
+struct pinctrl_amd_dmi_quirk {
+	int powerbtn;
+};
+
+static const struct dmi_system_id pinctrl_amd_dmi_quirks[] __initconst = {
+	{
+		/*
+		 * Lenovo Ideapad 5
+		 * Power button GPIO not cleared until touchpad movement
+		 * https://bugzilla.kernel.org/show_bug.cgi?id=217833
+		 */
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "82LM"),
+		},
+		.driver_data = &(struct pinctrl_amd_dmi_quirk) {
+			.powerbtn = 0,
+		},
+	}
+};
+
 static int amd_gpio_get_direction(struct gpio_chip *gc, unsigned offset)
 {
 	unsigned long flags;
@@ -1084,8 +1106,16 @@ static void handle_powerbtn(struct amd_gpio *gpio_dev)
 {
 	u32 pin_reg;
 
-	if (powerbtn == -1)
-		return;
+	if (powerbtn == -1) {
+		const struct pinctrl_amd_dmi_quirk *quirk = NULL;
+		const struct dmi_system_id *id;
+
+		id = dmi_first_match(pinctrl_amd_dmi_quirks);
+		if (!id)
+			return;
+		quirk = id->driver_data;
+		powerbtn = quirk->powerbtn;
+	}
 
 	pin_reg = readl(gpio_dev->base + WAKE_INT_MASTER_REG);
 	switch (powerbtn) {
-- 
2.34.1