linux-kernel - [PATCH 6/9] drm/panfrost: Avoid re-enabling job interrupts in the reset path

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Message-ID: <20241014233758.994861-6-adrian.larumbe@collabora.com>
Date: Tue, 15 Oct 2024 00:31:41 +0100
From: Adrián Larumbe <adrian.larumbe@...labora.com>
To: Boris Brezillon <boris.brezillon@...labora.com>,
	Rob Herring <robh@...nel.org>,
	Steven Price <steven.price@....com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Philipp Zabel <p.zabel@...gutronix.de>
Cc: kernel@...labora.com,
	Adrián Larumbe <adrian.larumbe@...labora.com>,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 6/9] drm/panfrost: Avoid re-enabling job interrupts in the reset path

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

Signed-off-by: Adrián Larumbe <adrian.larumbe@...labora.com>
---
 drivers/gpu/drm/panfrost/panfrost_device.c |  6 +++---
 drivers/gpu/drm/panfrost/panfrost_device.h |  2 +-
 drivers/gpu/drm/panfrost/panfrost_job.c    | 14 +++++---------
 drivers/gpu/drm/panfrost/panfrost_job.h    |  2 +-
 4 files changed, 10 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/panfrost/panfrost_device.c b/drivers/gpu/drm/panfrost/panfrost_device.c
index 4fe29286bbe3..a2a58501cbd9 100644
--- a/drivers/gpu/drm/panfrost/panfrost_device.c
+++ b/drivers/gpu/drm/panfrost/panfrost_device.c
@@ -395,20 +395,20 @@ 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_enable_interrupts(pfdev, enable_job_int);
 }
 
 static int panfrost_device_runtime_resume(struct device *dev)
 {
 	struct panfrost_device *pfdev = dev_get_drvdata(dev);
 
-	panfrost_device_reset(pfdev);
+	panfrost_device_reset(pfdev, true);
 	panfrost_devfreq_resume(pfdev);
 
 	return 0;
diff --git a/drivers/gpu/drm/panfrost/panfrost_device.h b/drivers/gpu/drm/panfrost/panfrost_device.h
index d9aea2c2cbe5..fc83d5e104a3 100644
--- a/drivers/gpu/drm/panfrost/panfrost_device.h
+++ b/drivers/gpu/drm/panfrost/panfrost_device.h
@@ -205,7 +205,7 @@ 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;
 
diff --git a/drivers/gpu/drm/panfrost/panfrost_job.c b/drivers/gpu/drm/panfrost/panfrost_job.c
index 52ec9dc2397c..68be555c6c52 100644
--- a/drivers/gpu/drm/panfrost/panfrost_job.c
+++ b/drivers/gpu/drm/panfrost/panfrost_job.c
@@ -414,7 +414,7 @@ static struct dma_fence *panfrost_job_run(struct drm_sched_job *sched_job)
 	return fence;
 }
 
-void panfrost_job_enable_interrupts(struct panfrost_device *pfdev)
+void panfrost_job_enable_interrupts(struct panfrost_device *pfdev, bool enable_job_int)
 {
 	int j;
 	u32 irq_mask = 0;
@@ -426,7 +426,8 @@ void panfrost_job_enable_interrupts(struct panfrost_device *pfdev)
 	}
 
 	job_write(pfdev, JOB_INT_CLEAR, irq_mask);
-	job_write(pfdev, JOB_INT_MASK, irq_mask);
+	if (enable_job_int)
+		job_write(pfdev, JOB_INT_MASK, irq_mask);
 }
 
 void panfrost_job_suspend_irq(struct panfrost_device *pfdev)
@@ -718,12 +719,7 @@ 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);
@@ -898,7 +894,7 @@ int panfrost_job_init(struct panfrost_device *pfdev)
 		}
 	}
 
-	panfrost_job_enable_interrupts(pfdev);
+	panfrost_job_enable_interrupts(pfdev, true);
 
 	return 0;
 
diff --git a/drivers/gpu/drm/panfrost/panfrost_job.h b/drivers/gpu/drm/panfrost/panfrost_job.h
index ec581b97852b..3b8b712c1722 100644
--- a/drivers/gpu/drm/panfrost/panfrost_job.h
+++ b/drivers/gpu/drm/panfrost/panfrost_job.h
@@ -46,7 +46,7 @@ void panfrost_job_close(struct panfrost_file_priv *panfrost_priv);
 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_enable_interrupts(struct panfrost_device *pfdev);
+void panfrost_job_enable_interrupts(struct panfrost_device *pfdev, bool enable_job_int);
 void panfrost_job_suspend_irq(struct panfrost_device *pfdev);
 int panfrost_job_is_idle(struct panfrost_device *pfdev);
 
-- 
2.46.2