HID: amd_sfh: Add interrupt handler to process interrupts

On newer AMD platforms with SFH, it is observed that random interrupts
get generated on the SFH hardware and until this is cleared the firmware
sensor processing is stalled, resulting in no data been received to
driver side.

Add routines to handle these interrupts, so that firmware operations are
not stalled.
Signed-off-by: Basavaraj Natikar <Basavaraj.Natikar@amd.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/hid/amd-sfh-hid/amd_sfh_pcie.c

@@ -106,6 +106,30 @@ static void amd_sfh_clear_intr(struct amd_mp2_dev *privdata)
 		privdata->mp2_ops->clear_intr(privdata);
 }
 
+static irqreturn_t amd_sfh_irq_handler(int irq, void *data)
+{
+	amd_sfh_clear_intr(data);
+
+	return IRQ_HANDLED;
+}
+
+static int amd_sfh_irq_init_v2(struct amd_mp2_dev *privdata)
+{
+	int rc;
+
+	pci_intx(privdata->pdev, true);
+
+	rc = devm_request_irq(&privdata->pdev->dev, privdata->pdev->irq,
+			      amd_sfh_irq_handler, 0, DRIVER_NAME, privdata);
+	if (rc) {
+		dev_err(&privdata->pdev->dev, "failed to request irq %d err=%d\n",
+			privdata->pdev->irq, rc);
+		return rc;
+	}
+
+	return 0;
+}
+
 void amd_start_sensor(struct amd_mp2_dev *privdata, struct amd_mp2_sensor_info info)
 {
 	union sfh_cmd_param cmd_param;
@@ -210,6 +234,7 @@ static void amd_mp2_pci_remove(void *privdata)
 	struct amd_mp2_dev *mp2 = privdata;
 	amd_sfh_hid_client_deinit(privdata);
 	mp2->mp2_ops->stop_all(mp2);
+	pci_intx(mp2->pdev, false);
 	amd_sfh_clear_intr(mp2);
 }
 
@@ -219,6 +244,7 @@ static const struct amd_mp2_ops amd_sfh_ops_v2 = {
 	.stop_all = amd_stop_all_sensor_v2,
 	.response = amd_sfh_wait_response_v2,
 	.clear_intr = amd_sfh_clear_intr_v2,
+	.init_intr = amd_sfh_irq_init_v2,
 };
 
 static const struct amd_mp2_ops amd_sfh_ops = {
@@ -244,6 +270,14 @@ static void mp2_select_ops(struct amd_mp2_dev *privdata)
 	}
 }
 
+static int amd_sfh_irq_init(struct amd_mp2_dev *privdata)
+{
+	if (privdata->mp2_ops->init_intr)
+		return privdata->mp2_ops->init_intr(privdata);
+
+	return 0;
+}
+
 static int amd_mp2_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 {
 	struct amd_mp2_dev *privdata;
@@ -280,6 +314,12 @@ static int amd_mp2_pci_probe(struct pci_dev *pdev, const struct pci_device_id *i
 
 	mp2_select_ops(privdata);
 
+	rc = amd_sfh_irq_init(privdata);
+	if (rc) {
+		dev_err(&pdev->dev, "amd_sfh_irq_init failed\n");
+		return rc;
+	}
+
 	rc = amd_sfh_hid_client_init(privdata);
 	if (rc) {
 		amd_sfh_clear_intr(privdata);

drivers/hid/amd-sfh-hid/amd_sfh_pcie.h

@@ -142,5 +142,6 @@ struct amd_mp2_ops {
 	 void (*stop_all)(struct amd_mp2_dev *privdata);
 	 int (*response)(struct amd_mp2_dev *mp2, u8 sid, u32 sensor_sts);
 	 void (*clear_intr)(struct amd_mp2_dev *privdata);
+	 int (*init_intr)(struct amd_mp2_dev *privdata);
 };
 #endif