gpu: host1x: Request syncpoint IRQs only during probe

Syncpoint IRQs are currently requested in a code path that runs
during resume. Due to this, we get multiple overlapping registered
interrupt handlers as host1x is suspended and resumed.

Rearrange interrupt code to only request IRQs during initialization.

Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240531070719.2138-1-cyndis@kapsi.fi

Author: cyndis

drivers/gpu/host1x/dev.h

@@ -9,6 +9,7 @@
 #include <linux/device.h>
 #include <linux/iommu.h>
 #include <linux/iova.h>
+#include <linux/irqreturn.h>
 #include <linux/platform_device.h>
 #include <linux/reset.h>
 
@@ -81,6 +82,7 @@ struct host1x_intr_ops {
 	void (*disable_syncpt_intr)(struct host1x *host, unsigned int id);
 	void (*disable_all_syncpt_intrs)(struct host1x *host);
 	int (*free_syncpt_irq)(struct host1x *host);
+	irqreturn_t (*isr)(int irq, void *dev_id);
 };
 
 struct host1x_sid_entry {

drivers/gpu/host1x/hw/intr_hw.c

@@ -6,18 +6,11 @@
  * Copyright (c) 2010-2013, NVIDIA Corporation.
  */
 
-#include <linux/interrupt.h>
-#include <linux/irq.h>
 #include <linux/io.h>
 
 #include "../intr.h"
 #include "../dev.h"
 
-struct host1x_intr_irq_data {
-	struct host1x *host;
-	u32 offset;
-};
-
 static irqreturn_t syncpt_thresh_isr(int irq, void *dev_id)
 {
 	struct host1x_intr_irq_data *irq_data = dev_id;
@@ -54,7 +47,8 @@ static void host1x_intr_disable_all_syncpt_intrs(struct host1x *host)
 	}
 }
 
-static void intr_hw_init(struct host1x *host, u32 cpm)
+static int
+host1x_intr_init_host_sync(struct host1x *host, u32 cpm)
 {
 #if HOST1X_HW < 6
 	/* disable the ip_busy_timeout. this prevents write drops */
@@ -85,32 +79,6 @@ static void intr_hw_init(struct host1x *host, u32 cpm)
 		host1x_sync_writel(host, irq_index, HOST1X_SYNC_SYNCPT_INTR_DEST(id));
 	}
 #endif
-}
-
-static int
-host1x_intr_init_host_sync(struct host1x *host, u32 cpm)
-{
-	int err, i;
-	struct host1x_intr_irq_data *irq_data;
-
-	irq_data = devm_kcalloc(host->dev, host->num_syncpt_irqs, sizeof(irq_data[0]), GFP_KERNEL);
-	if (!irq_data)
-		return -ENOMEM;
-
-	host1x_hw_intr_disable_all_syncpt_intrs(host);
-
-	for (i = 0; i < host->num_syncpt_irqs; i++) {
-		irq_data[i].host = host;
-		irq_data[i].offset = i;
-
-		err = devm_request_irq(host->dev, host->syncpt_irqs[i],
-				       syncpt_thresh_isr, IRQF_SHARED,
-				       "host1x_syncpt", &irq_data[i]);
-		if (err < 0)
-			return err;
-	}
-
-	intr_hw_init(host, cpm);
 
 	return 0;
 }
@@ -144,4 +112,5 @@ static const struct host1x_intr_ops host1x_intr_ops = {
 	.enable_syncpt_intr = host1x_intr_enable_syncpt_intr,
 	.disable_syncpt_intr = host1x_intr_disable_syncpt_intr,
 	.disable_all_syncpt_intrs = host1x_intr_disable_all_syncpt_intrs,
+	.isr = syncpt_thresh_isr,
 };

drivers/gpu/host1x/intr.c

@@ -6,7 +6,7 @@
  */
 
 #include <linux/clk.h>
-
+#include <linux/interrupt.h>
 #include "dev.h"
 #include "fence.h"
 #include "intr.h"
@@ -100,7 +100,9 @@ void host1x_intr_handle_interrupt(struct host1x *host, unsigned int id)
 
 int host1x_intr_init(struct host1x *host)
 {
+	struct host1x_intr_irq_data *irq_data;
 	unsigned int id;
+	int i, err;
 
 	mutex_init(&host->intr_mutex);
 
@@ -111,6 +113,23 @@ int host1x_intr_init(struct host1x *host)
 		INIT_LIST_HEAD(&syncpt->fences.list);
 	}
 
+	irq_data = devm_kcalloc(host->dev, host->num_syncpt_irqs, sizeof(irq_data[0]), GFP_KERNEL);
+	if (!irq_data)
+		return -ENOMEM;
+
+	host1x_hw_intr_disable_all_syncpt_intrs(host);
+
+	for (i = 0; i < host->num_syncpt_irqs; i++) {
+		irq_data[i].host = host;
+		irq_data[i].offset = i;
+
+		err = devm_request_irq(host->dev, host->syncpt_irqs[i],
+				       host->intr_op->isr, IRQF_SHARED,
+				       "host1x_syncpt", &irq_data[i]);
+		if (err < 0)
+			return err;
+	}
+
 	return 0;
 }
 

drivers/gpu/host1x/intr.h

@@ -11,6 +11,11 @@
 struct host1x;
 struct host1x_syncpt_fence;
 
+struct host1x_intr_irq_data {
+	struct host1x *host;
+	u32 offset;
+};
+
 /* Initialize host1x sync point interrupt */
 int host1x_intr_init(struct host1x *host);