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pinctrl-amd: enable IRQ for WACF2200 touchscreen on Lenovo Yoga 7 14AGP11

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On Lenovo Yoga 7 14AGP11 (83TD), the WACF2200 touchscreen controller
is wired via I2C2 (AMDI0010:02) with its interrupt on GPIO pin 157
(confirmed via ACPI _CRS GpioInt decode). After amd_gpio_irq_init()
clears all GPIO interrupts at boot, pin 157 is never re-enabled,
preventing the touchscreen from signalling the driver.

Windows keeps GPIO 157 INTERRUPT_ENABLE (bit 11) and INTERRUPT_MASK
(bit 12) set after initialisation. Add a DMI quirk to restore these
bits after amd_gpio_irq_init() on this hardware.

Assisted-by: Claude:claude-sonnet-4-6
Assisted-by: GPT-Codex:gpt-5.2-codex
Signed-off-by: Hardik Prakash <hardikprakash.official@gmail.com>
Acked-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: Linus Walleij <linusw@kernel.org>
This commit is contained in:
Hardik Prakash 2026-05-12 13:01:38 +05:30 committed by Linus Walleij
parent 63d2059cd6
commit 3812a9e842
1 changed files with 35 additions and 0 deletions
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35
drivers/pinctrl/pinctrl-amd.c
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@ -26,6 +26,7 @@
#include <linux/interrupt.h>
#include <linux/bitops.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/dmi.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/string_choices.h>
@ -39,6 +40,39 @@
static struct amd_gpio *pinctrl_dev;
#endif
static const struct dmi_system_id amd_gpio_quirk_yoga7_14agp11[] = {
{
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
DMI_MATCH(DMI_PRODUCT_NAME, "83TD"),
DMI_MATCH(DMI_BOARD_NAME, "LNVNB161216"),
},
},
{ }
};
static void amd_gpio_apply_quirks(struct amd_gpio *gpio_dev)
{
const unsigned int pin = 157; /* WACF2200 GpioInt per ACPI _CRS */
unsigned long flags;
u32 reg;
if (!dmi_check_system(amd_gpio_quirk_yoga7_14agp11))
return;
if (pin >= gpio_dev->gc.ngpio)
return;
raw_spin_lock_irqsave(&gpio_dev->lock, flags);
reg = readl(gpio_dev->base + pin * 4);
reg |= BIT(INTERRUPT_ENABLE_OFF) | BIT(INTERRUPT_MASK_OFF);
writel(reg, gpio_dev->base + pin * 4);
raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
dev_info(&gpio_dev->pdev->dev,
"Enabled IRQ for GPIO %u (Yoga 7 14AGP11 touchscreen)\n",
pin);
}
static int amd_gpio_get_direction(struct gpio_chip *gc, unsigned offset)
{
unsigned long flags;
@ -1219,6 +1253,7 @@ static int amd_gpio_probe(struct platform_device *pdev)
/* Disable and mask interrupts */
amd_gpio_irq_init(gpio_dev);
amd_gpio_apply_quirks(gpio_dev);
girq = &gpio_dev->gc.irq;
gpio_irq_chip_set_chip(girq, &amd_gpio_irqchip);