Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Sender: akhilpo=codeaurora.org@mg.codeaurora.org
DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 6B7C1C433C9
From:   Akhil P Oommen <akhilpo@codeaurora.org>
To:     freedreno@lists.freedesktop.org, devicetree@vger.kernel.org
Cc:     robh@kernel.org, dri-devel@freedesktop.org,
        linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org,
        jcrouse@codeaurora.org, mka@chromium.org, robdclark@gmail.com,
        dianders@chromium.org
Subject: [PATCH v5 1/3] drm/msm: Add support for GPU cooling
Date:   Fri, 30 Oct 2020 16:17:10 +0530
Message-Id: <1604054832-3114-1-git-send-email-akhilpo@codeaurora.org>
Precedence: bulk

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

Signed-off-by: Akhil P Oommen <akhilpo@codeaurora.org>
Tested-by: Matthias Kaehlcke <mka@chromium.org>
---
Changes in v5:
	1. Update Reviewed-by/Tested-by tags
Changes in v4:
	1. Fix gpu cooling map.
	2. Add mka's Reviewed-by tag.
Changes in v3:
	1. Minor fix in binding documentation (RobH)
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