[PATCH] drm/msm: handle for EPROBE_DEFER for of_icc_get

[Jonathan Marek]

Check for EPROBE_DEFER instead of silently not using icc if the msm driver
probes before the interconnect driver.

Only check for EPROBE_DEFER because of_icc_get can return other errors that
we want to ignore (ENODATA).

Remove the WARN_ON in msm_gpu_cleanup because INIT_LIST_HEAD won't have
been called on the list yet when going through the defer error path.

Signed-off-by: Jonathan Marek <jonat...@marek.ca>
---
 drivers/gpu/drm/msm/adreno/adreno_gpu.c | 17 ++++++++++++++---
 drivers/gpu/drm/msm/msm_gpu.c           |  2 --
 2 files changed, 14 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c 
b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
index 89673c7ed473..393c00425d68 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
@@ -940,12 +940,20 @@ static int adreno_get_pwrlevels(struct device *dev,
                 */
                gpu->icc_path = of_icc_get(dev, NULL);
        }
-       if (IS_ERR(gpu->icc_path))
+       if (IS_ERR(gpu->icc_path)) {
+               ret = PTR_ERR(gpu->icc_path);
                gpu->icc_path = NULL;
+               if (ret == -EPROBE_DEFER)
+                       return ret;
+       }
 
        gpu->ocmem_icc_path = of_icc_get(dev, "ocmem");
-       if (IS_ERR(gpu->ocmem_icc_path))
+       if (IS_ERR(gpu->ocmem_icc_path)) {
+               ret = PTR_ERR(gpu->ocmem_icc_path);
                gpu->ocmem_icc_path = NULL;
+               if (ret == -EPROBE_DEFER)
+                       return ret;
+       }
 
        return 0;
 }
@@ -996,6 +1004,7 @@ int adreno_gpu_init(struct drm_device *drm, struct 
platform_device *pdev,
        struct adreno_platform_config *config = pdev->dev.platform_data;
        struct msm_gpu_config adreno_gpu_config  = { 0 };
        struct msm_gpu *gpu = &adreno_gpu->base;
+       int ret;
 
        adreno_gpu->funcs = funcs;
        adreno_gpu->info = adreno_info(config->rev);
@@ -1007,7 +1016,9 @@ int adreno_gpu_init(struct drm_device *drm, struct 
platform_device *pdev,
 
        adreno_gpu_config.nr_rings = nr_rings;
 
-       adreno_get_pwrlevels(&pdev->dev, gpu);
+       ret = adreno_get_pwrlevels(&pdev->dev, gpu);
+       if (ret)
+               return ret;
 
        pm_runtime_set_autosuspend_delay(&pdev->dev,
                adreno_gpu->info->inactive_period);
diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
index a22d30622306..ccf9a0dd9706 100644
--- a/drivers/gpu/drm/msm/msm_gpu.c
+++ b/drivers/gpu/drm/msm/msm_gpu.c
@@ -959,8 +959,6 @@ void msm_gpu_cleanup(struct msm_gpu *gpu)
 
        DBG("%s", gpu->name);
 
-       WARN_ON(!list_empty(&gpu->active_list));
-
        for (i = 0; i < ARRAY_SIZE(gpu->rb); i++) {
                msm_ringbuffer_destroy(gpu->rb[i]);
                gpu->rb[i] = NULL;
-- 
2.26.1