[PATCH v2 1/3] drm/msm: Add support for GPU cooling

[Akhil P Oommen]

Register GPU as a devfreq cooling device so that it can be passively
cooled by the thermal framework.

Signed-off-by: Akhil P Oommen <akhi...@codeaurora.org>
---
Changes in v2:
        1. Update the dt bindings documentation

 drivers/gpu/drm/msm/msm_gpu.c | 12 ++++++++++++
 drivers/gpu/drm/msm/msm_gpu.h |  2 ++
 2 files changed, 14 insertions(+)

diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
index 55d1648..9f9db46 100644
--- a/drivers/gpu/drm/msm/msm_gpu.c
+++ b/drivers/gpu/drm/msm/msm_gpu.c
@@ -14,6 +14,7 @@
 #include <generated/utsrelease.h>
 #include <linux/string_helpers.h>
 #include <linux/devfreq.h>
+#include <linux/devfreq_cooling.h>
 #include <linux/devcoredump.h>
 #include <linux/sched/task.h>
 
@@ -107,9 +108,18 @@ static void msm_devfreq_init(struct msm_gpu *gpu)
        if (IS_ERR(gpu->devfreq.devfreq)) {
                DRM_DEV_ERROR(&gpu->pdev->dev, "Couldn't initialize GPU 
devfreq\n");
                gpu->devfreq.devfreq = NULL;
+               return;
        }
 
        devfreq_suspend_device(gpu->devfreq.devfreq);
+
+       gpu->cooling = of_devfreq_cooling_register(gpu->pdev->dev.of_node,
+                       gpu->devfreq.devfreq);
+       if (IS_ERR(gpu->cooling)) {
+               DRM_DEV_ERROR(&gpu->pdev->dev,
+                               "Couldn't register GPU cooling device\n");
+               gpu->cooling = NULL;
+       }
 }
 
 static int enable_pwrrail(struct msm_gpu *gpu)
@@ -1005,4 +1015,6 @@ void msm_gpu_cleanup(struct msm_gpu *gpu)
                gpu->aspace->mmu->funcs->detach(gpu->aspace->mmu);
                msm_gem_address_space_put(gpu->aspace);
        }
+
+       devfreq_cooling_unregister(gpu->cooling);
 }
diff --git a/drivers/gpu/drm/msm/msm_gpu.h b/drivers/gpu/drm/msm/msm_gpu.h
index 6c9e1fd..9a8f20d 100644
--- a/drivers/gpu/drm/msm/msm_gpu.h
+++ b/drivers/gpu/drm/msm/msm_gpu.h
@@ -147,6 +147,8 @@ struct msm_gpu {
        struct msm_gpu_state *crashstate;
        /* True if the hardware supports expanded apriv (a650 and newer) */
        bool hw_apriv;
+
+       struct thermal_cooling_device *cooling;
 };
 
 static inline struct msm_gpu *dev_to_gpu(struct device *dev)
-- 
2.7.4