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Tue, 20 Oct 2026 15:28:37 +0800 (CST) X-QQ-SSF: 0000000000000000000000000000000 X-QQ-GoodBg: 0 X-BIZMAIL-ID: 6990828045487407985 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 1/7] drm/bridge: aux-hpd-bridge: Add drm_dev_has_dp_hpd_bridge() Date: Tue, 20 Oct 2026 15:28:10 +0800 Message-Id: <20261020072816.180-2-kernel@airkyi.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20261020072816.180-1-kernel@airkyi.com> References: <20261020072816.180-1-kernel@airkyi.com> X-QQ-SENDSIZE: 520 Feedback-ID: zesmtpsz:airkyi.com:qybglogicsvrgz:qybglogicsvrgz6b-0 X-QQ-XMAILINFO: MJ6jNhKcfW6R3v6PMslEjS4Ucgmtk3fxIZa4H9JtnTKBsVcTMUrZl1R/ /WAFY+Vl4eG+tnTM9gayApsSf/8e/vDoBTQJ2+pi8vyB1k3kG32NW5c35dU9euwVQN5PRgq nwobbkTFicPiHYixgj6/88BmqqWT4e/BuvPctbrsS6ErCCYKlBqpeO5hNHKZ2HWOjhUn/4g Q69tFGZknXFFhJTQuBZVfHi/IeZx4NSI39SrL1D5yZJacsN1rdovCwC5Rp9olrTF9dy9fju zj3npXYdQtInFZEHmOyJgcne4GpKyvqkAqAA0Ekyhr6nD3FgT5mP0M1vnutqrLCOlVb32Kx 32zMb5Vl60CfOORqw0Kf2qUx6NEMrwjTJOhKNnCdzQDC6B5f861AX5ZnkXylIZ0g7CZ9jFI PIuh+HRb0ITK1faQ0B4YoMmrhWuBDMy0oHX/KBMEa+k0kCyiyRTvN9B7maUOTBDHfyXh/Mp 7qU0YD4w2liAlrVFZ6bCJriLZWwGKCCJSmCsbBEZLMyYoEQpgjxiw+P7SlqAeWEQPjlEIp0 C/IVhK4EDU45k6PoWXCN/fxpYfzm+nhJvDq9gx7I86n8jdOPS25SNplv2QTy6P1jsY8g2oC RTewu/GpSC4mM/GJ8YuXpYbynPpNfWXZUdTgwUd6XBZF3jU9HeG46TspXSknqlMjqFp1Oqy ENGohaIUEep6VZxwMI8kKXvd42moN9jNhHLSzaIwdtfvIST7SIS7YTK6HjOL4zruFBRTEEd Y78vh8T/AIPF0KTIZRbyyGRS0qa4edvkGMGVIcIoEHDACU+h9vEWNGaikk9HnPJzOOwpHG+ WPpnDJwpkkSpnstjV9yLIyHmYDTBBuiCCdGjwNvoomFN4aiReF0u0PltzTAzmUlfGxrP418 cLanHGzSv0lF/OtVV75YHOk5pp3OljAOXMutlG7GoYUToeHigtobuc5JrXyDSu62LdVvOm2 WoEtvVaaX99qsMT4foUClnNEHgnckhSmsychjDYflSOO9Mw+BFmAV22vm63CPxGCurE/eBK ssAtWNww== X-QQ-XMRINFO: OD9hHCdaPRBwH5bRRRw8tsiH4UAatJqXfg== X-QQ-RECHKSPAM: 0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261020_002952_415231_38439E43 X-CRM114-Status: GOOD ( 13.56 ) 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=-17.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_EF,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,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 Add a new API to check whether a DisplayPort HPD bridge has already been registered. This helps avoid duplicate registration of the same HPD bridge, although the current framework allows doing so. Suggested-by: Sebastian Reichel Reviewed-by: Sebastian Reichel Tested-by: Sebastian Reichel Signed-off-by: Chaoyi Chen --- (no changes since v7) --- drivers/gpu/drm/bridge/aux-hpd-bridge.c | 42 ++++++++++++++++++++++++- include/drm/bridge/aux-bridge.h | 6 ++++ 2 files changed, 47 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/bridge/aux-hpd-bridge.c b/drivers/gpu/drm/bridge/aux-hpd-bridge.c index a2e525aa5788..7aa630fcf735 100644 --- a/drivers/gpu/drm/bridge/aux-hpd-bridge.c +++ b/drivers/gpu/drm/bridge/aux-hpd-bridge.c @@ -13,6 +13,8 @@ #include #include +#define DRM_AUX_HPD_BRIDGE_NAME "dp_hpd_bridge" + static DEFINE_IDA(drm_aux_hpd_bridge_ida); struct drm_aux_hpd_bridge_data { @@ -37,6 +39,44 @@ static void drm_aux_hpd_bridge_free_adev(void *_adev) auxiliary_device_uninit(_adev); } +static int hpd_bridge_match(struct device *dev, const void *data) +{ + const struct device_node *np = data; + struct auxiliary_device *adev; + + if (!dev_is_auxiliary(dev)) + return 0; + + adev = to_auxiliary_dev(dev); + if (strcmp(adev->name, DRM_AUX_HPD_BRIDGE_NAME)) + return 0; + + return adev->dev.platform_data == np; +} + +/** + * drm_dev_has_dp_hpd_bridge - check whether a HPD DisplayPort bridge is registered + * @parent: device instance providing this bridge + * @np: device node pointer corresponding to this bridge instance + * + * Walk the children of @parent and check whether a HPD DisplayPort bridge for + * the given @np has already been registered via devm_drm_dp_hpd_bridge_add(). + * + * Return: true if a HPD bridge for @parent / @np already exists, false otherwise + */ +bool drm_dev_has_dp_hpd_bridge(struct device *parent, struct device_node *np) +{ + struct device *child; + + child = device_find_child(parent, np, hpd_bridge_match); + if (child) { + put_device(child); + return true; + } + return false; +} +EXPORT_SYMBOL_GPL(drm_dev_has_dp_hpd_bridge); + /** * devm_drm_dp_hpd_bridge_alloc - allocate a HPD DisplayPort bridge * @parent: device instance providing this bridge @@ -64,7 +104,7 @@ struct auxiliary_device *devm_drm_dp_hpd_bridge_alloc(struct device *parent, str } adev->id = ret; - adev->name = "dp_hpd_bridge"; + adev->name = DRM_AUX_HPD_BRIDGE_NAME; adev->dev.parent = parent; adev->dev.release = drm_aux_hpd_bridge_release; adev->dev.platform_data = of_node_get(np); diff --git a/include/drm/bridge/aux-bridge.h b/include/drm/bridge/aux-bridge.h index c2f5a855512f..cca07a8e2d45 100644 --- a/include/drm/bridge/aux-bridge.h +++ b/include/drm/bridge/aux-bridge.h @@ -25,6 +25,7 @@ struct auxiliary_device *devm_drm_dp_hpd_bridge_alloc(struct device *parent, str int devm_drm_dp_hpd_bridge_add(struct device *dev, struct auxiliary_device *adev); struct device *drm_dp_hpd_bridge_register(struct device *parent, struct device_node *np); +bool drm_dev_has_dp_hpd_bridge(struct device *parent, struct device_node *np); void drm_aux_hpd_bridge_notify(struct device *dev, enum drm_connector_status status); #else static inline struct auxiliary_device *devm_drm_dp_hpd_bridge_alloc(struct device *parent, @@ -44,6 +45,11 @@ static inline struct device *drm_dp_hpd_bridge_register(struct device *parent, return NULL; } +static inline bool drm_dev_has_dp_hpd_bridge(struct device *parent, struct device_node *np) +{ + return false; +} + static inline void drm_aux_hpd_bridge_notify(struct device *dev, enum drm_connector_status status) { } -- 2.53.0 _______________________________________________ Linux-rockchip mailing list Linux-rockchip@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-rockchip