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[92.176.231.205]) by smtp.gmail.com with ESMTPSA id b1-20020a5d6341000000b00323293bd023sm10579306wrw.6.2023.11.15.05.16.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 15 Nov 2023 05:16:02 -0800 (PST) From: Javier Martinez Canillas To: linux-kernel@vger.kernel.org Cc: Maxime Ripard , Bilal Elmoussaoui , Simon Ser , Erico Nunes , Pekka Paalanen , Thomas Zimmermann , Sima Vetter , Javier Martinez Canillas , Daniel Vetter , David Airlie , Jonathan Corbet , Maarten Lankhorst , dri-devel@lists.freedesktop.org, linux-doc@vger.kernel.org Subject: [PATCH v2 5/5] drm/todo: Add entry about implementing buffer age for damage tracking Date: Wed, 15 Nov 2023 14:15:44 +0100 Message-ID: <20231115131549.2191589-6-javierm@redhat.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20231115131549.2191589-1-javierm@redhat.com> References: <20231115131549.2191589-1-javierm@redhat.com> MIME-Version: 1.0 X-Spam-Status: No, score=-2.2 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, RCVD_IN_DNSWL_BLOCKED,RCVD_IN_MSPIKE_H4,RCVD_IN_MSPIKE_WL, SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (snail.vger.email [0.0.0.0]); Wed, 15 Nov 2023 05:16:40 -0800 (PST) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1782636052675472539 X-GMAIL-MSGID: 1782636052675472539 Currently, only damage tracking for frame damage is supported. If a driver needs to do buffer damage (e.g: the framebuffer attached to plane's state has changed since the last page-flip), the damage helpers just fallback to a full plane update. Add en entry in the TODO about implementing buffer age or any other damage accumulation algorithm for buffer damage handling. Suggested-by: Simon Ser Signed-off-by: Javier Martinez Canillas Reviewed-by: Simon Ser --- (no changes since v1) Documentation/gpu/todo.rst | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/Documentation/gpu/todo.rst b/Documentation/gpu/todo.rst index b62c7fa0c2bc..5c43a958814b 100644 --- a/Documentation/gpu/todo.rst +++ b/Documentation/gpu/todo.rst @@ -782,6 +782,26 @@ Contact: Hans de Goede Level: Advanced +Buffer age or other damage accumulation algorithm for buffer damage handling +============================================================================ + +Drivers that do per-buffer uploads, need a buffer damage handling (rather than +frame damage like drivers that do per-plane or per-CRTC uploads), but there is +no support to get the buffer age or any other damage accumulation algorithm. + +For this reason, the damage helpers just fallback to a full plane update if the +framebuffer attached to a plane has changed since the last page-flip. + +This should be improved to get damage tracking properly working on drivers that +do per-buffer uploads. + +More information about damage tracking and references to learning materials in +`Damage Tracking Properties `_ + +Contact: Javier Martinez Canillas + +Level: Advanced + Outside DRM ===========