drm/panfrost: Make re-enabling job interrupts at device reset optional

Rather than remasking interrupts after a device reset in the main reset
path, allow selecting whether to do this with an additional bool parameter.

To this end, split reenabling job interrupts into two functions, one that
clears the interrupts and another one which unmasks them conditionally.

Reviewed-by: Steven Price <steven.price@arm.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Adrián Larumbe <adrian.larumbe@collabora.com>
Link: https://lore.kernel.org/r/20251019145225.3621989-9-adrian.larumbe@collabora.com
Signed-off-by: Steven Price <steven.price@arm.com>

Author: larunbe

drivers/gpu/drm/panfrost/panfrost_device.c

@@ -400,13 +400,16 @@ bool panfrost_exception_needs_reset(const struct panfrost_device *pfdev,
 	return false;
 }
 
-void panfrost_device_reset(struct panfrost_device *pfdev)
+void panfrost_device_reset(struct panfrost_device *pfdev, bool enable_job_int)
 {
 	panfrost_gpu_soft_reset(pfdev);
 
 	panfrost_gpu_power_on(pfdev);
 	panfrost_mmu_reset(pfdev);
-	panfrost_job_enable_interrupts(pfdev);
+
+	panfrost_job_reset_interrupts(pfdev);
+	if (enable_job_int)
+		panfrost_job_enable_interrupts(pfdev);
 }
 
 static int panfrost_device_runtime_resume(struct device *dev)
@@ -430,7 +433,7 @@ static int panfrost_device_runtime_resume(struct device *dev)
 		}
 	}
 
-	panfrost_device_reset(pfdev);
+	panfrost_device_reset(pfdev, true);
 	panfrost_devfreq_resume(pfdev);
 
 	return 0;

drivers/gpu/drm/panfrost/panfrost_device.h

@@ -250,7 +250,7 @@ int panfrost_unstable_ioctl_check(void);
 
 int panfrost_device_init(struct panfrost_device *pfdev);
 void panfrost_device_fini(struct panfrost_device *pfdev);
-void panfrost_device_reset(struct panfrost_device *pfdev);
+void panfrost_device_reset(struct panfrost_device *pfdev, bool enable_job_int);
 
 extern const struct dev_pm_ops panfrost_pm_ops;
 

drivers/gpu/drm/panfrost/panfrost_job.c

@@ -430,11 +430,14 @@ static struct dma_fence *panfrost_job_run(struct drm_sched_job *sched_job)
 	return fence;
 }
 
+void panfrost_job_reset_interrupts(struct panfrost_device *pfdev)
+{
+	job_write(pfdev, JOB_INT_CLEAR, ALL_JS_INT_MASK);
+}
+
 void panfrost_job_enable_interrupts(struct panfrost_device *pfdev)
 {
 	clear_bit(PANFROST_COMP_BIT_JOB, pfdev->is_suspended);
-
-	job_write(pfdev, JOB_INT_CLEAR, ALL_JS_INT_MASK);
 	job_write(pfdev, JOB_INT_MASK, ALL_JS_INT_MASK);
 }
 
@@ -727,12 +730,7 @@ panfrost_reset(struct panfrost_device *pfdev,
 	spin_unlock(&pfdev->js->job_lock);
 
 	/* Proceed with reset now. */
-	panfrost_device_reset(pfdev);
-
-	/* panfrost_device_reset() unmasks job interrupts, but we want to
-	 * keep them masked a bit longer.
-	 */
-	job_write(pfdev, JOB_INT_MASK, 0);
+	panfrost_device_reset(pfdev, false);
 
 	/* GPU has been reset, we can clear the reset pending bit. */
 	atomic_set(&pfdev->reset.pending, 0);
@@ -754,7 +752,7 @@ panfrost_reset(struct panfrost_device *pfdev,
 		drm_sched_start(&pfdev->js->queue[i].sched, 0);
 
 	/* Re-enable job interrupts now that everything has been restarted. */
-	job_write(pfdev, JOB_INT_MASK, ALL_JS_INT_MASK);
+	panfrost_job_enable_interrupts(pfdev);
 
 	dma_fence_end_signalling(cookie);
 }
@@ -907,6 +905,7 @@ int panfrost_job_init(struct panfrost_device *pfdev)
 		}
 	}
 
+	panfrost_job_reset_interrupts(pfdev);
 	panfrost_job_enable_interrupts(pfdev);
 
 	return 0;

drivers/gpu/drm/panfrost/panfrost_job.h

@@ -69,6 +69,7 @@ void panfrost_job_close(struct drm_file *file);
 int panfrost_job_get_slot(struct panfrost_job *job);
 int panfrost_job_push(struct panfrost_job *job);
 void panfrost_job_put(struct panfrost_job *job);
+void panfrost_job_reset_interrupts(struct panfrost_device *pfdev);
 void panfrost_job_enable_interrupts(struct panfrost_device *pfdev);
 void panfrost_job_suspend_irq(struct panfrost_device *pfdev);
 int panfrost_job_is_idle(struct panfrost_device *pfdev);