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Tue, 20 Oct 2026 15:28:32 +0800 (CST) X-QQ-SSF: 0000000000000000000000000000000 X-QQ-GoodBg: 0 X-BIZMAIL-ID: 1917325487105428466 From: Chaoyi Chen To: Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Luca Ceresoli , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Sandy Huang , =?UTF-8?q?Heiko=20St=C3=BCbner?= , Andy Yan , Vinod Koul , Sebastian Reichel , Nicolas Frattaroli , Heikki Krogerus Cc: linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-phy@lists.infradead.org, Chaoyi Chen Subject: [PATCH v8 0/7] drm/bridge: Implement generic USB Type-C DP HPD bridge Date: Tue, 20 Oct 2026 15:28:09 +0800 Message-Id: <20261020072816.180-1-kernel@airkyi.com> X-Mailer: git-send-email 2.17.1 X-QQ-SENDSIZE: 520 Feedback-ID: zesmtpsz:airkyi.com:qybglogicsvrgz:qybglogicsvrgz6b-0 X-QQ-XMAILINFO: M4afFXlZrPyBiC6UULLsbTLemqI7xA+KM1Re9xYGYf9JEeNWHMb/QAGP BpOt68sFuuMP06UgY67XD3KvGH9EjQ1MacU4HdSH6EXLLHOsD49+OfVfvXyysBF5sJtqn+f 4QaPG/3KC1uhWsh6XQiNlEzz0US4EZC67lS8pdA/6liA6g/KDPTao3IQ6q6v9TTBkbEMQDz 5JJJRvjzXeWmV0pUnGxvJ01BJX8QYyGGbR6IeCcrc2ltslGoF4eC7/qY4YD3/VobIGPIX2N qF0orrnWjgi9nQhii9qUp8mTwXsijFOqeo1u7xWtLCz/ZJJQOTac4JFx2fMbRn+3nWngh7+ XbbUFFjBrjmF+KSPDDQgQ0r9M64JuG9by73Rf7rsOr4xCohQ+7lxef5ayfMWap1lTF5le64 L6/ESF5RL2ZUuTlUscvkeS4F5hn+xSPJWT2tBekOaM0MEsYbJz3pbZQn87qXTRuK6ANX72t rMX4J0i89/8xCvbxmiZ9httn+B5VCwVIVoDeKdNSmXjWUyDdQ7vqc8KS/XdmVOpnYyQE/w6 aKx5YhXRTyrU+3P2YEjfG3wFq8Bsv1wbb1jkXlXPjmH/6TFYvVjDwxJXeHNW5CUs0+MBbEg +Kromx3KIDqIXhGF1LR74VSX+rYGIOVnkx7lkyQYaNiGns5BeKOx0r/nMJx53bJBp2u2mzR 6BTJam3q4ptELzod87Jqo0ULo0G9abGIQvQxbCvgOJU3sBAheVLzlC3u1oo7RxEG82BPmeW oSCYzPSh65ozwZSFNpcZyVA2EF59bQRDupBQ75ZV5SAlfOYVFbwkIzMB05ZYzxk6w/z9R1g FTUWVdGMkddEc2l+NuLMOS0HroSFKWetKMG4InDDxKoyH5kR7WjKKFz9cjB8JNqr6nywJnL CR2/YwGoNLaCE19zAAbv166TSeFSGIS++hec6R4iHoLETSI8GjI6fmc1969pKpcB2fZN9rw 5JIuyIiIbsTREydTLSMDD8KoLM97NkyhBY0AIrPiVnbDxHOgW12o0eMiccq1n2KIB2tRA+l xgt78zQ4F9HZlKMcnN X-QQ-XMRINFO: OWPUhxQsoeAVwkVaQIEGSKwwgKCxK/fD5g== X-QQ-RECHKSPAM: 0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261020_002945_525581_E1ABC451 X-CRM114-Status: GOOD ( 11.84 ) X-Spam-Score: -2.1 (--) X-BeenThere: linux-rockchip@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Upstream kernel work for Rockchip platforms List-Archive: List-Post: List-Help: List-Subscribe: , X-Archived-By: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-rockchip" X-Spam-Status: No, score=-12.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_EF,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 From: Chaoyi Chen This series is split from the v15 "Add Type-C DP support for RK3399 EVB IND board" series [1]. It focuses on the DRM bridge and Rockchip platform CDN-DP controller changes. [1] https://lore.kernel.org/all/20260304094152.92-1-kernel@airkyi.com/ ==== 1. Generic Type-C DP HPD bridge Currently, several USB-C controller drivers register their own DP HPD bridge via aux-hpd-bridge.c, each duplicating the same logic. For devicetree based platforms, the USB-C controller may vary across boards, and not every USB-C controller driver implements this feature. Patch 1 implements a generic DP HPD bridge that monitors Type-C bus events and automatically creates an HPD bridge when a Type-C port device with DP SVID is registered. 2. Multiple bridge model for CDN-DP The RK3399 has two USB/DP combo PHY and one CDN-DP controller. Patch 5 introduces a multi-bridge model where each PHY port gets a separate encoder and bridge, allowing flexible selection of the output PHY port. This is based on the DRM AUX HPD bridge rather than extcon. ==== Patch 1 adds new API to check whether a DisplayPort HPD bridge has already been registered (Sebastian). Patch 2 adds generic USB Type-C DP HPD bridge (Dmitry, Heikki). Patch 3 adds module soft depend for USB Type-C DP HPD bridge(Sebastian). Patch 4 adds new API drm_aux_bridge_register_from_node() (Neil). Patch 5 adds DRM AUX bridge support for RK3399 USBDP PHY (Neil). Patch 6 drops CDN-DP's extcon dependency when Type-C is present (Dmitry). Patch 7 adds multiple bridges to support PHY port selection (Dmitry, Luca). Changes in v8: - Link to v7: https://lore.kernel.org/all/20260828084737.565-1-kernel@airkyi.com/ - Send missing HPD event to userspace in cdn_dp_pd_event_work() (sashiko). Changes in v7: - Link to v6: https://lore.kernel.org/all/20260804070730.68-1-kernel@airkyi.com/ - Fix extcon HPD detection by checking lanes in cdn_dp_connected_port() (sashiko). - Bound endpoint count by PHY ports to avoid overflow and uninitialized reads (sashiko). - Use drm_bridge_clear_and_put() to clear next_bridge_list pointers (sashiko). - Clear EDID cache pointers after free in unbind() (sashiko). Changes in v6: - Link to v5: https://lore.kernel.org/all/20260730013349.51-1-kernel@airkyi.com/ - Avoid duplicate registration of the same DisplayPort HPD bridge. Changes in v5: - Link to v4: https://lore.kernel.org/all/20260727064408.101-1-kernel@airkyi.com/ - Add module soft depend for USB Type-C DP HPD bridge. Changes in v4: - Link to v3: https://lore.kernel.org/all/20260717072323.96-1-kernel@airkyi.com/ - Scan the entire typec_bus and attempt to register the hpd bridge, so as not to miss devices that were already added during initialization. Changes in v3: - Link to v2: https://lore.kernel.org/all/20260608070805.88-1-kernel@airkyi.com/ (Sorry, I forgot to add the "v2" title, so it looks like v1.) - Remove now-redundant call to drm_connector_attach_encoder() - Rebase to v7.2-rc2 Changes in v2: - Link to v1: https://lore.kernel.org/all/20260521032854.103-1-kernel@airkyi.com/ - Add copyright text. - Remove useless goto. - Fix incorrect function names in the documentation comments. - Fix the check logic for dp->active_port (0 is valid). - Fix the uninitialized prev_port. - Remove duplicate logic from cdn_dp_switch_port(). - Fix the prototype of cdn_dp_bridge_hpd_notify(). - Properly release connector->fwnode. - Properly release next_bridge. Chaoyi Chen (7): drm/bridge: aux-hpd-bridge: Add drm_dev_has_dp_hpd_bridge() drm/bridge: Implement generic USB Type-C DP HPD bridge drm/display: Add soft depend for aux-hpd-typec-dp-bridge module drm/bridge: aux: Add drm_aux_bridge_register_from_node() phy: rockchip: phy-rockchip-typec: Add DRM AUX bridge drm/rockchip: cdn-dp: Support handle lane info without extcon drm/rockchip: cdn-dp: Add multiple bridges to support PHY port selection drivers/gpu/drm/bridge/Kconfig | 10 + drivers/gpu/drm/bridge/Makefile | 1 + drivers/gpu/drm/bridge/aux-bridge.c | 26 +- drivers/gpu/drm/bridge/aux-hpd-bridge.c | 42 +- .../gpu/drm/bridge/aux-hpd-typec-dp-bridge.c | 67 ++++ .../gpu/drm/display/drm_display_helper_mod.c | 1 + drivers/gpu/drm/rockchip/Kconfig | 1 + drivers/gpu/drm/rockchip/cdn-dp-core.c | 369 +++++++++++++++--- drivers/gpu/drm/rockchip/cdn-dp-core.h | 19 +- drivers/phy/rockchip/Kconfig | 2 + drivers/phy/rockchip/phy-rockchip-typec.c | 13 +- include/drm/bridge/aux-bridge.h | 12 + 12 files changed, 491 insertions(+), 72 deletions(-) create mode 100644 drivers/gpu/drm/bridge/aux-hpd-typec-dp-bridge.c -- 2.53.0 _______________________________________________ Linux-rockchip mailing list Linux-rockchip@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-rockchip