linux-kernel - [PATCH v4 06/10] drm/panfrost: Don't rework job IRQ enable mask in the enable path

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Message-ID: <20251001022039.1215976-7-adrian.larumbe@collabora.com>
Date: Wed,  1 Oct 2025 03:20:27 +0100
From: Adrián Larumbe <adrian.larumbe@...labora.com>
To: linux-kernel@...r.kernel.org
Cc: dri-devel@...ts.freedesktop.org,
	Steven Price <steven.price@....com>,
	Boris Brezillon <boris.brezillon@...labora.com>,
	kernel@...labora.com,
	Adrián Larumbe <adrian.larumbe@...labora.com>,
	Rob Herring <robh@...nel.org>,
	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>
Subject: [PATCH v4 06/10] drm/panfrost: Don't rework job IRQ enable mask in the enable path

Up until now, panfrost_job_enable_interrupts() would always recalculate the
same job IRQ enablement mask, which is effectively a constant.

Replace it with a compile-time constant value, and also in another couple
places where an equivalent expression was being used.

Signed-off-by: Adrián Larumbe <adrian.larumbe@...labora.com>
---
 drivers/gpu/drm/panfrost/panfrost_device.h |  4 ++++
 drivers/gpu/drm/panfrost/panfrost_job.c    | 19 ++++---------------
 2 files changed, 8 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/panfrost/panfrost_device.h b/drivers/gpu/drm/panfrost/panfrost_device.h
index 474b232bb38e..ac7147ed806b 100644
--- a/drivers/gpu/drm/panfrost/panfrost_device.h
+++ b/drivers/gpu/drm/panfrost/panfrost_device.h
@@ -26,6 +26,10 @@ struct panfrost_perfcnt;
 
 #define MAX_PM_DOMAINS 5
 
+#define ALL_JS_INT_MASK					\
+	(GENMASK(16 + NUM_JOB_SLOTS - 1, 16) |		\
+	 GENMASK(NUM_JOB_SLOTS - 1, 0))
+
 enum panfrost_drv_comp_bits {
 	PANFROST_COMP_BIT_GPU,
 	PANFROST_COMP_BIT_JOB,
diff --git a/drivers/gpu/drm/panfrost/panfrost_job.c b/drivers/gpu/drm/panfrost/panfrost_job.c
index ba934437a8ea..54764ce91dea 100644
--- a/drivers/gpu/drm/panfrost/panfrost_job.c
+++ b/drivers/gpu/drm/panfrost/panfrost_job.c
@@ -428,17 +428,10 @@ static struct dma_fence *panfrost_job_run(struct drm_sched_job *sched_job)
 
 void panfrost_job_enable_interrupts(struct panfrost_device *pfdev)
 {
-	int j;
-	u32 irq_mask = 0;
-
 	clear_bit(PANFROST_COMP_BIT_JOB, pfdev->is_suspended);
 
-	for (j = 0; j < NUM_JOB_SLOTS; j++) {
-		irq_mask |= MK_JS_MASK(j);
-	}
-
-	job_write(pfdev, JOB_INT_CLEAR, irq_mask);
-	job_write(pfdev, JOB_INT_MASK, irq_mask);
+	job_write(pfdev, JOB_INT_CLEAR, ALL_JS_INT_MASK);
+	job_write(pfdev, JOB_INT_MASK, ALL_JS_INT_MASK);
 }
 
 void panfrost_job_suspend_irq(struct panfrost_device *pfdev)
@@ -757,9 +750,7 @@ 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,
-		  GENMASK(16 + NUM_JOB_SLOTS - 1, 16) |
-		  GENMASK(NUM_JOB_SLOTS - 1, 0));
+	job_write(pfdev, JOB_INT_MASK, ALL_JS_INT_MASK);
 
 	dma_fence_end_signalling(cookie);
 }
@@ -832,9 +823,7 @@ static irqreturn_t panfrost_job_irq_handler_thread(int irq, void *data)
 
 	/* Enable interrupts only if we're not about to get suspended */
 	if (!test_bit(PANFROST_COMP_BIT_JOB, pfdev->is_suspended))
-		job_write(pfdev, JOB_INT_MASK,
-			  GENMASK(16 + NUM_JOB_SLOTS - 1, 16) |
-			  GENMASK(NUM_JOB_SLOTS - 1, 0));
+		job_write(pfdev, JOB_INT_MASK, ALL_JS_INT_MASK);
 
 	return IRQ_HANDLED;
 }
-- 
2.51.0