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Fri, 09 Oct 2020 11:36:41 -0700 (PDT) Date: Fri, 9 Oct 2020 11:36:40 -0700 From: mka@chromium.org To: Akhil P Oommen Cc: freedreno@lists.freedesktop.org, robh@kernel.org, robdclark@gmail.com, linux-arm-msm@vger.kernel.org, dri-devel@freedesktop.org, linux-kernel@vger.kernel.org Subject: Re: [2/2] drm/msm: Add support for GPU cooling Message-ID: <20201009183640.GB1292413@google.com> References: <1602176947-17385-2-git-send-email-akhilpo@codeaurora.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <1602176947-17385-2-git-send-email-akhilpo@codeaurora.org> Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Hi Akhil, On Thu, Oct 08, 2020 at 10:39:07PM +0530, Akhil P Oommen wrote: > Register GPU as a devfreq cooling device so that it can be passively > cooled by the thermal framework. > > Signed-off-by: Akhil P Oommen > --- > drivers/gpu/drm/msm/msm_gpu.c | 13 ++++++++++++- > drivers/gpu/drm/msm/msm_gpu.h | 2 ++ > 2 files changed, 14 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c > index 55d1648..93ffd66 100644 > --- a/drivers/gpu/drm/msm/msm_gpu.c > +++ b/drivers/gpu/drm/msm/msm_gpu.c > @@ -14,6 +14,7 @@ > #include > #include > #include > +#include > #include > #include > > @@ -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) > @@ -926,7 +936,6 @@ int msm_gpu_init(struct drm_device *drm, struct platform_device *pdev, > > msm_devfreq_init(gpu); > > - > gpu->aspace = gpu->funcs->create_address_space(gpu, pdev); > > if (gpu->aspace == NULL) > @@ -1005,4 +1014,6 @@ 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); Resources should be released in reverse order, otherwise the cooling device could use resources that have already been freed.