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Tue, 12 May 2026 00:32:29 -0700 (PDT) From: Hardik Prakash To: linux-gpio@vger.kernel.org, linux-i2c@vger.kernel.org Cc: linus.walleij@linaro.org, wsa@kernel.org, Hardik Prakash Subject: [PATCH 1/2] pinctrl-amd: enable IRQ for WACF2200 touchscreen on Lenovo Yoga 7 14AGP11 Date: Tue, 12 May 2026 13:01:38 +0530 Message-ID: <20260512073139.16343-2-hardikprakash.official@gmail.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260512073139.16343-1-hardikprakash.official@gmail.com> References: <20260512073139.16343-1-hardikprakash.official@gmail.com> Precedence: bulk X-Mailing-List: linux-i2c@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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. Signed-off-by: Hardik Prakash --- drivers/pinctrl/pinctrl-amd.c | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) diff --git a/drivers/pinctrl/pinctrl-amd.c b/drivers/pinctrl/pinctrl-amd.c index e3128b0045d22..64315b0edf2a6 100644 --- a/drivers/pinctrl/pinctrl-amd.c +++ b/drivers/pinctrl/pinctrl-amd.c @@ -26,6 +26,7 @@ #include #include #include +#include #include #include #include @@ -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); -- 2.54.0