drm/msm/adreno: Prevent unclocked access when retrieving timestamps

msm_gpu's get_timestamp() op (called by the MSM_GET_PARAM ioctl) can
result in register accesses. We need our power domain and clocks to
be active for that. Make sure they are enabled here.

Signed-off-by: Archit Taneja <architt@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>

diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
index f1ab2703674a2f5d4f533828bb6c8b49df24f571..7414c6bbd582e9597e502305885f0dec909859be 100644 (file)
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
@@ -48,8 +48,15 @@ int adreno_get_param(struct msm_gpu *gpu, uint32_t param, uint64_t *value)
                *value = adreno_gpu->base.fast_rate;
                return 0;
        case MSM_PARAM_TIMESTAMP:
-               if (adreno_gpu->funcs->get_timestamp)
-                       return adreno_gpu->funcs->get_timestamp(gpu, value);
+               if (adreno_gpu->funcs->get_timestamp) {
+                       int ret;
+
+                       pm_runtime_get_sync(&gpu->pdev->dev);
+                       ret = adreno_gpu->funcs->get_timestamp(gpu, value);
+                       pm_runtime_put_autosuspend(&gpu->pdev->dev);
+
+                       return ret;
+               }
                return -EINVAL;
        default:
                DBG("%s: invalid param: %u", gpu->name, param);