linux-kernel - [PATCH 4/4] pinctrl: amd: Use amd_pinconf

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Fri, 30 Jun 2023 14:47:16 -0500
From:   Mario Limonciello <mario.limonciello@....com>
To:     <Basavaraj.Natikar@....com>, <Shyam-sundar.S-k@....com>,
        <linus.walleij@...aro.org>
CC:     <npliashechnikov@...il.com>, <nmschulte@...il.com>,
        <friedrich.vock@....de>, <dridri85@...il.com>,
        <linux-gpio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Mario Limonciello <mario.limonciello@....com>
Subject: [PATCH 4/4] pinctrl: amd: Use amd_pinconf_set() for all config options

On ASUS TUF A16 it is reported that the ITE5570 ACPI device connected to
GPIO 7 is causing an interrupt storm.  This issue doesn't happen on
Windows.

Comparing the GPIO register configuration between Windows and Linux
bit 20 has been configured as a pull up on Windows, but not on Linux.
Checking GPIO declaration from the firmware it is clear it *should* have
been a pull up on Linux as well.

```
                    GpioInt (Level, ActiveLow, Exclusive, PullUp, 0x0000,
                        "\\_SB.GPIO", 0x00, ResourceConsumer, ,
                        )
                        {   // Pin list
                            0x0007
                        }
```

On Linux amd_gpio_set_config() is currently only used for programming
the debounce. Actually the GPIO core calls it with all the arguments
that are supported by a GPIO, pinctrl-amd just responds `-ENOTSUPP`.

To solve this issue expand amd_gpio_set_config() to support the other
arguments amd_pinconf_set() supports, namely `PIN_CONFIG_BIAS_PULL_DOWN`,
`PIN_CONFIG_BIAS_PULL_UP`, and `PIN_CONFIG_DRIVE_STRENGTH`.

Reported-by: Nik P <npliashechnikov@...il.com>
Reported-by: Nathan Schulte <nmschulte@...il.com>
Reported-by: Friedrich Vock <friedrich.vock@....de>
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=217336
Reported-by: dridri85@...il.com
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=217493
Link: https://lore.kernel.org/linux-input/20230530154058.17594-1-friedrich.vock@gmx.de/
Fixes: 2956b5d94a76b ("pinctrl / gpio: Introduce .set_config() callback for GPIO chips")
Signed-off-by: Mario Limonciello <mario.limonciello@....com>
---
 drivers/pinctrl/pinctrl-amd.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/pinctrl/pinctrl-amd.c b/drivers/pinctrl/pinctrl-amd.c
index a22e02e2f5d35..76fabf4404a6c 100644
--- a/drivers/pinctrl/pinctrl-amd.c
+++ b/drivers/pinctrl/pinctrl-amd.c
@@ -852,9 +852,6 @@ static int amd_gpio_set_config(struct gpio_chip *gc, unsigned pin,
 {
 	struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
 
-	if (pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE)
-		return -ENOTSUPP;
-
 	return amd_pinconf_set(gpio_dev->pctrl, pin, &config, 1);
 }
 
-- 
2.34.1