[PATCH 3/5] drm/msm/adreno: Load the firmware before bringing up the hardware

[Jordan Crouse]

Failure to load firmware is the primary reason to fail adreno_load_gpu().
Try to load it first before going into the hardware initialization code and
unwinding it. This is important for a6xx because the GMU gets loaded from
the runtime power code and it is more costly to fail in that path because
of missing firmware.

[v2 - fix compile error caused by adreno_load_fw declared static in
 adreno_gpu ]

Signed-off-by: Jordan Crouse <jcrouse at codeaurora.org>
---
 drivers/gpu/drm/msm/adreno/adreno_device.c | 23 +++++++++++++++++++++-
 drivers/gpu/drm/msm/adreno/adreno_gpu.c    |  2 +-
 drivers/gpu/drm/msm/adreno/adreno_gpu.h    |  2 +-
 3 files changed, 24 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/msm/adreno/adreno_device.c b/drivers/gpu/drm/msm/adreno/adreno_device.c
index 44813624a286..37746f1d54cf 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_device.c
+++ b/drivers/gpu/drm/msm/adreno/adreno_device.c
@@ -155,6 +155,7 @@ struct msm_gpu *adreno_load_gpu(struct drm_device *dev)
 	struct msm_drm_private *priv = dev->dev_private;
 	struct platform_device *pdev = priv->gpu_pdev;
 	struct msm_gpu *gpu = NULL;
+	struct adreno_gpu *adreno_gpu;
 	int ret;
 
 	if (pdev)
@@ -165,7 +166,27 @@ struct msm_gpu *adreno_load_gpu(struct drm_device *dev)
 		return NULL;
 	}
 
-	pm_runtime_get_sync(&pdev->dev);
+	adreno_gpu = to_adreno_gpu(gpu);
+
+	/*
+	 * The number one reason for HW init to fail is if the firmware isn't
+	 * loaded yet. Try that first and don't bother continuing on
+	 * otherwise
+	 */
+
+	ret = adreno_load_fw(adreno_gpu);
+	if (ret)
+		return NULL;
+
+	/* Make sure pm runtime is active and reset any previous errors */
+	pm_runtime_set_active(&pdev->dev);
+
+	ret = pm_runtime_get_sync(&pdev->dev);
+	if (ret < 0) {
+		dev_err(dev->dev, "Couldn't power up the GPU: %d\n", ret);
+		return NULL;
+	}
+
 	mutex_lock(&dev->struct_mutex);
 	ret = msm_gpu_hw_init(gpu);
 	mutex_unlock(&dev->struct_mutex);
diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
index bcbf9f2a29f9..ae693c28d66c 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
@@ -138,7 +138,7 @@ adreno_request_fw(struct adreno_gpu *adreno_gpu, const char *fwname)
 	return ERR_PTR(-ENOENT);
 }
 
-static int adreno_load_fw(struct adreno_gpu *adreno_gpu)
+int adreno_load_fw(struct adreno_gpu *adreno_gpu)
 {
 	int i;
 
diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.h b/drivers/gpu/drm/msm/adreno/adreno_gpu.h
index bc9ec27e9ed8..81397935d847 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.h
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.h
@@ -227,7 +227,7 @@ int adreno_gpu_init(struct drm_device *drm, struct platform_device *pdev,
 		struct adreno_gpu *gpu, const struct adreno_gpu_funcs *funcs,
 		int nr_rings);
 void adreno_gpu_cleanup(struct adreno_gpu *gpu);
-
+int adreno_load_fw(struct adreno_gpu *adreno_gpu);
 
 /* ringbuffer helpers (the parts that are adreno specific) */
 
-- 
2.17.1