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[73.25.156.94]) by smtp.gmail.com with ESMTPSA id k7sm4759153pjj.46.2021.05.19.11.35.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 19 May 2021 11:35:06 -0700 (PDT) From: Rob Clark To: dri-devel@lists.freedesktop.org Subject: [RFC 0/3] dma-fence: Add a "boost" mechanism Date: Wed, 19 May 2021 11:38:51 -0700 Message-Id: <20210519183855.1523927-1-robdclark@gmail.com> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Rob Clark , linux-arm-msm@vger.kernel.org, open list , "moderated list:DMA BUFFER SHARING FRAMEWORK" , freedreno@lists.freedesktop.org, "open list:DMA BUFFER SHARING FRAMEWORK" Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" From: Rob Clark In some cases, like double-buffered rendering, missing vblanks can trick the GPU into running at a lower frequence, when really we want to be running at a higher frequency to not miss the vblanks in the first place. This is partially inspired by a trick i915 does, but implemented via dma-fence for a couple of reasons: 1) To continue to be able to use the atomic helpers 2) To support cases where display and gpu are different drivers The last patch is just proof of concept, in reality I think it may want to be a bit more clever. But sending this out as it is as an RFC to get feedback. Rob Clark (3): dma-fence: Add boost fence op drm/atomic: Call dma_fence_boost() when we've missed a vblank drm/msm: Wire up gpu boost drivers/gpu/drm/drm_atomic_helper.c | 11 +++++++++++ drivers/gpu/drm/msm/msm_fence.c | 10 ++++++++++ drivers/gpu/drm/msm/msm_gpu.c | 13 +++++++++++++ drivers/gpu/drm/msm/msm_gpu.h | 2 ++ include/linux/dma-fence.h | 26 ++++++++++++++++++++++++++ 5 files changed, 62 insertions(+) -- 2.30.2