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Mon, 12 Oct 2026 17:12:02 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=dkim; t=1791817926; h=from:subject:date:message-id:to:cc:mime-version:content-type: content-transfer-encoding:in-reply-to:references; bh=hsr4q6N64Fcf6mYkwtlmKaY913OD6ROMQBz3nI6nZSA=; b=I7a1ficVVdXqQhn4g9Q+0hbsycz4p4gNccwb07fbYPLvJVjsl4tPdCQFTQhWfUqUdYgfgH 8pmfYdPFIA9HDbXnRaIqxUIjBYSLzUKbycpsFXgHNEQGCOOwnR1KK3ulVffmrFsz00cH85 RamtkeujxQJSN/PbhNpQvzeYPIaLNwVxudVf93sRRfACKmeY27pzc3qZFu6l7NmYagkefv vkvirJ/KB6JrumGCIPAEx5+3JMLY+VgcH8bj8aceXyMrLFHkaSK4GiYqQtBIKtthcOYszI hiW5rXs5YiSA2IyyZDL7CHDcDTAR2VmtYGYUT2R60VBQkJoNUfZ971AKINtT0A== From: Kory Maincent Date: Mon, 12 Oct 2026 17:11:01 +0200 Subject: [PATCH RFC v3 6/8] drm/bridge: Expose link training state via new DRM_BRIDGE_OP_DP flag Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20261012-feat_link_cap-v3-6-7517f4aba0f3@bootlin.com> References: <20261012-feat_link_cap-v3-0-7517f4aba0f3@bootlin.com> In-Reply-To: <20261012-feat_link_cap-v3-0-7517f4aba0f3@bootlin.com> To: Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Jani Nikula , Rodrigo Vivi , Joonas Lahtinen , Tvrtko Ursulin , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Luca Ceresoli , Chun-Kuang Hu , Philipp Zabel , Matthias Brugger , AngeloGioacchino Del Regno , Dmitry Baryshkov , Daniel Stone Cc: Thomas Petazzoni , Mark Yacoub , Sean Paul , Manasi Navare , Drew Davenport , Louis Chauvet , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org, linux-mediatek@lists.infradead.org, linux-arm-kernel@lists.infradead.org, Kory Maincent X-Mailer: b4 0.16.1-dev-17221 X-Last-TLS-Session-Version: TLSv1.3 X-Last-TLS-Session-Version: None X-Rspamd-Queue-Id: 58B7611D71873 X-Spamd-Result: default: False [0.32 / 30.00]; BAYES_HAM(-2.18)[89.07%]; SUSPICIOUS_RECIPS(1.50)[]; DATE_IN_PAST(1.00)[26]; RCVD_NO_TLS_LAST(0.10)[]; MIME_GOOD(-0.10)[text/plain]; MIME_TRACE(0.00)[0:+]; FROM_HAS_DN(0.00)[]; BCC(0.00)[]; RCPT_COUNT_TWELVE(0.00)[35]; RCVD_VIA_SMTP_AUTH(0.00)[]; ARC_NA(0.00)[]; TAGGED_RCPT(0.00)[]; FORWARDED(0.00)[kory.maincent@bootlin.com]; DKIM_SIGNED(0.00)[bootlin.com:s=dkim]; FREEMAIL_TO(0.00)[linux.intel.com,kernel.org,suse.de,gmail.com,ffwll.ch,intel.com,ursulin.net,linaro.org,ideasonboard.com,kwiboo.se,bootlin.com,pengutronix.de,collabora.com]; TO_DN_SOME(0.00)[]; URIBL_BLOCKED(0.00)[localhost:rdns,localhost:helo,bootlin.com:mid,bootlin.com:email]; PREVIOUSLY_DELIVERED(0.00)[kory.maincent@bootlin.com]; TO_MATCH_ENVRCPT_SOME(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; RECEIVED_HELO_LOCALHOST(0.00)[]; NEURAL_HAM(-0.00)[-1.000]; MAILCOW_DOMAIN_HEADER_FROM(0.00)[bootlin.com]; MID_RHS_MATCH_FROM(0.00)[]; RCVD_COUNT_TWO(0.00)[2] Introduce DRM_BRIDGE_OP_DP, a new bridge operation flag for bridges that provide DisplayPort connector operations with link training support. Bridges advertising this flag must fill the dp_link_caps field in struct drm_bridge with their link capabilities. Signed-off-by: Kory Maincent --- Changes in v3: - Mone on from drmm_connector_dp_init() to drm_dp_source_set_caps(). Change in v2: - New patch --- drivers/gpu/drm/display/Kconfig | 1 + drivers/gpu/drm/display/drm_bridge_connector.c | 29 ++++++++++++++++++++++++++ include/drm/drm_bridge.h | 13 ++++++++++++ 3 files changed, 43 insertions(+) diff --git a/drivers/gpu/drm/display/Kconfig b/drivers/gpu/drm/display/Kconfig index df09cf9a8ca19..ce2f6d62c76d0 100644 --- a/drivers/gpu/drm/display/Kconfig +++ b/drivers/gpu/drm/display/Kconfig @@ -19,6 +19,7 @@ config DRM_BRIDGE_CONNECTOR select DRM_DISPLAY_HDMI_AUDIO_HELPER select DRM_DISPLAY_HDMI_CEC_HELPER select DRM_DISPLAY_HDMI_STATE_HELPER + select DRM_DISPLAY_DP_HELPER help DRM connector implementation terminating DRM bridge chains. diff --git a/drivers/gpu/drm/display/drm_bridge_connector.c b/drivers/gpu/drm/display/drm_bridge_connector.c index 81f3e26f6fdf5..5b58e86da6259 100644 --- a/drivers/gpu/drm/display/drm_bridge_connector.c +++ b/drivers/gpu/drm/display/drm_bridge_connector.c @@ -26,6 +26,7 @@ #include #include #include +#include /** * DOC: overview @@ -109,6 +110,13 @@ struct drm_bridge_connector { * HDMI Audio infrastructure, if any (see &DRM_BRIDGE_OP_HDMI_AUDIO). */ struct drm_bridge *bridge_hdmi_audio; + /** + * @bridge_dp: + * + * The bridge in the chain that implements necessary support for the + * DisplayPort connector infrastructure, if any (see &DRM_BRIDGE_OP_DP). + */ + struct drm_bridge *bridge_dp; /** * @bridge_dp_audio: * @@ -835,6 +843,7 @@ static void drm_bridge_connector_put_bridges(struct drm_device *dev, void *data) drm_bridge_put(bridge_connector->bridge_hdmi_audio); drm_bridge_put(bridge_connector->bridge_dp_audio); drm_bridge_put(bridge_connector->bridge_hdmi_cec); + drm_bridge_put(bridge_connector->bridge_dp); } /** @@ -968,6 +977,15 @@ struct drm_connector *drm_bridge_connector_init(struct drm_device *drm, bridge_connector->bridge_hdmi_audio = drm_bridge_get(bridge); } + if (bridge->ops & DRM_BRIDGE_OP_DP) { + if (bridge_connector->bridge_dp) + return ERR_PTR(-EBUSY); + if (!bridge->dp_link_caps) + return ERR_PTR(-EINVAL); + + bridge_connector->bridge_dp = drm_bridge_get(bridge); + } + if (bridge->ops & DRM_BRIDGE_OP_DP_AUDIO) { if (bridge_connector->bridge_dp_audio) return ERR_PTR(-EBUSY); @@ -1079,6 +1097,17 @@ struct drm_connector *drm_bridge_connector_init(struct drm_device *drm, connector_type, ddc); if (ret) return ERR_PTR(ret); + } else if (bridge_connector->bridge_dp) { + ret = drmm_connector_init(drm, connector, + &drm_bridge_connector_funcs, + connector_type, ddc); + if (ret) + return ERR_PTR(ret); + + ret = drm_dp_source_set_caps(connector, + bridge_connector->bridge_dp->dp_link_caps); + if (ret) + return ERR_PTR(ret); } else { ret = drmm_connector_init(drm, connector, &drm_bridge_connector_funcs, diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h index 1981d24a700d2..d1430b2b72518 100644 --- a/include/drm/drm_bridge.h +++ b/include/drm/drm_bridge.h @@ -1021,6 +1021,14 @@ enum drm_bridge_ops { * &drm_bridge_funcs->hdmi_clear_spd_infoframe callbacks. */ DRM_BRIDGE_OP_HDMI_SPD_INFOFRAME = BIT(10), + /** + * @DRM_BRIDGE_OP_DP: The bridge provides DisplayPort connector + * operations, including link training support. Bridges that set + * this flag must provide DisplayPort-related information and + * fill the &drm_bridge->dp_link_caps link training + * capabilities. + */ + DRM_BRIDGE_OP_DP = BIT(11), }; /** @@ -1214,6 +1222,11 @@ struct drm_bridge { */ void *hpd_data; + /** + * @dp_link_caps: DisplayPort link capabilities + */ + const struct drm_connector_dp_link_caps *dp_link_caps; + /** * @next_bridge: Pointer to the following bridge, automatically put * when this bridge is freed (i.e. at destroy time). This is for -- 2.43.0