drm/msm/a6xx: Bail out early if setting GPU OOB fails

If the GMU can't guarantee the required resources are up, trying to
bring up the GPU is a lost cause. Return early if setting GPU OOB
fails.

Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on SM8550-QRD
Tested-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> # sm8450
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/551830/
Signed-off-by: Rob Clark <robdclark@chromium.org>

Author: konradybcio

drivers/gpu/drm/msm/adreno/a6xx_gpu.c

@@ -1201,7 +1201,9 @@ static int hw_init(struct msm_gpu *gpu)
 
 	if (!adreno_has_gmu_wrapper(adreno_gpu)) {
 		/* Make sure the GMU keeps the GPU on while we set it up */
-		a6xx_gmu_set_oob(&a6xx_gpu->gmu, GMU_OOB_GPU_SET);
+		ret = a6xx_gmu_set_oob(&a6xx_gpu->gmu, GMU_OOB_GPU_SET);
+		if (ret)
+			return ret;
 	}
 
 	/* Clear GBIF halt in case GX domain was not collapsed */