[PATCH] platform/arm64: qcom-hamoa-ec: Disable the SCI IRQ during suspend

[Abel Vesa]

EC SCI events require I2C transfers to retrieve the event information.
During system resume, an SCI interrupt can be delivered before the I2C
controller is ready to handle transfers, resulting in failed event reads:

  geni_i2c a84000.i2c: error turning SE resources:-13
  qcom-hamoa-ec 3-0076: Failed to read EC SCI Event: -13

Keep SCI interrupt handling disabled across system sleep so that EC
events are processed only while the I2C controller is available. This
prevents event reads from racing with the controller's suspend and
resume transitions.

Fixes: 5c44f48e91de ("platform: arm64: Add driver for EC found on Qualcomm reference devices")
Signed-off-by: Abel Vesa <abel.vesa@xxxxxxxxxxxxxxxx>
---
 drivers/platform/arm64/qcom-hamoa-ec.c | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/drivers/platform/arm64/qcom-hamoa-ec.c b/drivers/platform/arm64/qcom-hamoa-ec.c
index 4d2ad042a7f8..d34afd901324 100644
--- a/drivers/platform/arm64/qcom-hamoa-ec.c
+++ b/drivers/platform/arm64/qcom-hamoa-ec.c
@@ -331,17 +331,28 @@ static const struct thermal_cooling_device_ops qcom_ec_thermal_ops = {
 static int qcom_ec_resume(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
+	int ret;
 
-	return i2c_smbus_write_byte_data(client, EC_MODERN_STANDBY_CMD,
-					 EC_MODERN_STANDBY_EXIT);
+	ret = i2c_smbus_write_byte_data(client, EC_MODERN_STANDBY_CMD,
+				      EC_MODERN_STANDBY_EXIT);
+	enable_irq(client->irq);
+
+	return ret;
 }
 
 static int qcom_ec_suspend(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
+	int ret;
 
-	return i2c_smbus_write_byte_data(client, EC_MODERN_STANDBY_CMD,
-					 EC_MODERN_STANDBY_ENTER);
+	/* Keep SCI reads from racing the I2C controller's system sleep. */
+	disable_irq(client->irq);
+	ret = i2c_smbus_write_byte_data(client, EC_MODERN_STANDBY_CMD,
+				      EC_MODERN_STANDBY_ENTER);
+	if (ret)
+		enable_irq(client->irq);
+
+	return ret;
 }
 
 static int qcom_ec_probe(struct i2c_client *client)

---
base-commit: 6c2cb8b8b843d216ab549b678a0d8831c43153e0
change-id: 20260930-qcom-hamoa-ec-suspend-irq-464201cadb6c

Best regards,
--  
Abel Vesa <abel.vesa@xxxxxxxxxxxxxxxx>