drm/v3d: CPU job submissions shouldn't affect V3D GPU clock

We can avoid calling the v3d_clock_up_put and v3d_clock_up_get
when a job is submitted to a CPU queue. We don't need to change
the V3D core frequency to run a CPU job as it is executed on
the CPU. This way we avoid delaying timestamps CPU jobs by 4.5ms
that is the time that it takes the firmware to increase the V3D
core frequency.

Fixes: fe6a858 ("drm/v3d: Correct clock settng calls to new APIs")
Signed-off-by: Jose Maria Casanova Crespo <jmcasanova@igalia.com>
Reviewed-by: Maíra Canal <mcanal@igalia.com>

Author: txenoo

drivers/gpu/drm/v3d/v3d_submit.c

@@ -125,9 +125,9 @@ v3d_lookup_bos(struct drm_device *dev,
 }
 
 static void
-v3d_job_free(struct kref *ref)
+v3d_job_free_common(struct v3d_job *job,
+		    bool is_gpu_job)
 {
-	struct v3d_job *job = container_of(ref, struct v3d_job, refcount);
 	struct v3d_dev *v3d = job->v3d;
 	int i;
 
@@ -140,14 +140,31 @@ v3d_job_free(struct kref *ref)
 	dma_fence_put(job->irq_fence);
 	dma_fence_put(job->done_fence);
 
-	v3d_clock_up_put(v3d);
+	if (is_gpu_job)
+		v3d_clock_up_put(v3d);
 
 	if (job->perfmon)
 		v3d_perfmon_put(job->perfmon);
 
 	kfree(job);
 }
 
+static void
+v3d_job_free(struct kref *ref)
+{
+	struct v3d_job *job = container_of(ref, struct v3d_job, refcount);
+
+	v3d_job_free_common(job, true);
+}
+
+static void
+v3d_cpu_job_free(struct kref *ref)
+{
+	struct v3d_job *job = container_of(ref, struct v3d_job, refcount);
+
+	v3d_job_free_common(job, false);
+}
+
 static void
 v3d_render_job_free(struct kref *ref)
 {
@@ -242,8 +259,9 @@ v3d_job_init(struct v3d_dev *v3d, struct drm_file *file_priv,
 		if (ret && ret != -ENOENT)
 			goto fail_deps;
 	}
+	if (queue != V3D_CPU)
+		v3d_clock_up_get(v3d);
 
-	v3d_clock_up_get(v3d);
 	kref_init(&job->refcount);
 
 	return 0;
@@ -1350,7 +1368,7 @@ v3d_submit_cpu_ioctl(struct drm_device *dev, void *data,
 	trace_v3d_submit_cpu_ioctl(&v3d->drm, cpu_job->job_type);
 
 	ret = v3d_job_init(v3d, file_priv, &cpu_job->base,
-			   v3d_job_free, 0, &se, V3D_CPU);
+			   v3d_cpu_job_free, 0, &se, V3D_CPU);
 	if (ret) {
 		v3d_job_deallocate((void *)&cpu_job);
 		goto fail;