[PATCH 5.16 20/28] Input: goodix - workaround Cherry Trail devices with a bogus ACPI Interrupt() resource

Greg Kroah-Hartman
2022-03-17T12:58:03Z

From: Hans de Goede <hdegoede@redhat.com>

[ Upstream commit d982992669733dd75520000c6057d8ee0725a363 ]

ACPI/x86 devices with a Cherry Trail SoC should have a GpioInt + a regular
GPIO ACPI resource in their ACPI tables.

Some CHT devices have a bug, where the also is bogus interrupt resource
(likely copied from a previous Bay Trail based generation of the device).

The i2c-core-acpi code will assign the bogus, non-working, interrupt
resource to client->irq. Add a workaround to fix this up.

BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=2043960
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20220228111613.363336-1-hdegoede@redhat.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/input/touchscreen/goodix.c | 16 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/input/touchscreen/goodix.c b/drivers/input/touchscreen/goodix.c
index e053aadea3c9..d3136842b717 100644
--- a/drivers/input/touchscreen/goodix.c
+++ b/drivers/input/touchscreen/goodix.c
@@ -745,7 +745,7 @@ static int goodix_add_acpi_gpio_mappings(struct goodix_ts_data *ts)
const struct acpi_gpio_mapping *gpio_mapping = NULL;
struct device *dev = &ts->client->dev;
LIST_HEAD(resources);
- int ret;
+ int irq, ret;

ts->gpio_count = 0;
ts->gpio_int_idx = -1;
@@ -758,6 +758,20 @@ static int goodix_add_acpi_gpio_mappings(struct goodix_ts_data *ts)

acpi_dev_free_resource_list(&resources);

+ /*
+ * CHT devices should have a GpioInt + a regular GPIO ACPI resource.
+ * Some CHT devices have a bug (where the also is bogus Interrupt
+ * resource copied from a previous BYT based generation). i2c-core-acpi
+ * will use the non-working Interrupt resource, fix this up.
+ */
+ if (soc_intel_is_cht() && ts->gpio_count == 2 && ts->gpio_int_idx != -1) {
+ irq = acpi_dev_gpio_irq_get(ACPI_COMPANION(dev), 0);
+ if (irq > 0 && irq != ts->client->irq) {
+ dev_warn(dev, "Overriding IRQ %d -> %d\n", ts->client->irq, irq);
+ ts->client->irq = irq;
+ }
+ }
+
if (ts->gpio_count == 2 && ts->gpio_int_idx == 0) {
ts->irq_pin_access_method = IRQ_PIN_ACCESS_ACPI_GPIO;
gpio_mapping = acpi_goodix_int_first_gpios;
--
2.34.1