[PATCH 4/9] drm/panfrost: handle job hw submit errors

["Adrián Larumbe" <adrian.larumbe@collabora.com>]

Avoid waiting for the DRM scheduler job timeout handler and let the DRM
scheduler core signal the error fence immediately instead when HW job
submission fails.

Signed-off-by: Adrián Larumbe <adrian.larumbe@collabora.com>
---
 drivers/gpu/drm/panfrost/panfrost_job.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/panfrost/panfrost_job.c b/drivers/gpu/drm/panfrost/panfrost_job.c
index f0a4690bcdf9..52ec9dc2397c 100644
--- a/drivers/gpu/drm/panfrost/panfrost_job.c
+++ b/drivers/gpu/drm/panfrost/panfrost_job.c
@@ -195,7 +195,7 @@ panfrost_enqueue_job(struct panfrost_device *pfdev, int slot,
 	return 1;
 }
 
-static void panfrost_job_hw_submit(struct panfrost_job *job, int js)
+static int panfrost_job_hw_submit(struct panfrost_job *job, int js)
 {
 	struct panfrost_device *pfdev = job->pfdev;
 	unsigned int subslot;
@@ -207,15 +207,15 @@ static void panfrost_job_hw_submit(struct panfrost_job *job, int js)
 
 	ret = pm_runtime_get_sync(pfdev->base.dev);
 	if (ret < 0)
-		return;
+		return ret;
 
 	if (WARN_ON(job_read(pfdev, JS_COMMAND_NEXT(js)))) {
-		return;
+		return -EINVAL;
 	}
 
 	ret = panfrost_mmu_as_get(pfdev, job->mmu, &cfg);
 	if (ret)
-		return;
+		return ret;
 
 	job_write(pfdev, JS_HEAD_NEXT_LO(js), lower_32_bits(jc_head));
 	job_write(pfdev, JS_HEAD_NEXT_HI(js), upper_32_bits(jc_head));
@@ -263,6 +263,8 @@ static void panfrost_job_hw_submit(struct panfrost_job *job, int js)
 			job, js, subslot, jc_head, cfg & 0xf);
 	}
 	spin_unlock(&pfdev->js->job_lock);
+
+	return 0;
 }
 
 static int panfrost_acquire_object_fences(struct drm_gem_object **bos,
@@ -384,6 +386,7 @@ static struct dma_fence *panfrost_job_run(struct drm_sched_job *sched_job)
 	struct panfrost_device *pfdev = job->pfdev;
 	int slot = panfrost_job_get_slot(job);
 	struct dma_fence *fence = NULL;
+	int ret;
 
 	if (unlikely(job->base.s_fence->finished.error))
 		return NULL;
@@ -402,7 +405,11 @@ static struct dma_fence *panfrost_job_run(struct drm_sched_job *sched_job)
 		dma_fence_put(job->done_fence);
 	job->done_fence = dma_fence_get(fence);
 
-	panfrost_job_hw_submit(job, slot);
+	ret = panfrost_job_hw_submit(job, slot);
+	if (ret) {
+		dma_fence_put(job->done_fence);
+		return ERR_PTR(ret);
+	}
 
 	return fence;
 }
-- 
2.46.2