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Thu, 26 Mar 2026 18:31:38 +0100 (CET) Received: by jupiter.universe (Postfix, from userid 1000) id 418EF48002D; Thu, 26 Mar 2026 18:31:38 +0100 (CET) From: Sebastian Reichel Date: Thu, 26 Mar 2026 18:31:27 +0100 Subject: [PATCH 03/10] drm/bridge: synopsys: dw-dp: Add follow-up bridge support 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: quoted-printable Message-Id: <20260326-synopsys-dw-dp-improvements-v1-3-501849162290@collabora.com> References: <20260326-synopsys-dw-dp-improvements-v1-0-501849162290@collabora.com> In-Reply-To: <20260326-synopsys-dw-dp-improvements-v1-0-501849162290@collabora.com> To: Sandy Huang , =?utf-8?q?Heiko_St=C3=BCbner?= , Andy Yan , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: Damon Ding , Dmitry Baryshkov , Alexey Charkov , dri-devel@lists.freedesktop.org, linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, kernel@collabora.com, Sebastian Reichel X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; 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a=openpgp; fpr=EF660D07463F8B726A795413D8EED7F3C83BFA9A Add support to use USB-C connectors with the DP altmode helper code on devicetree based platforms. To get this working there must be a DRM bridge chain from the DisplayPort controller to the USB-C connector. E.g. on Rockchip RK3576: root@rk3576 # cat /sys/kernel/debug/dri/0/encoder-0/bridges bridge[0]: dw_dp_bridge_funcs refcount: 7 type: [10] DP OF: /soc/dp@27e40000:rockchip,rk3576-dp ops: [0x47] detect edid hpd bridge[1]: drm_aux_bridge_funcs refcount: 4 type: [0] Unknown OF: /soc/phy@2b010000:rockchip,rk3576-usbdp-phy ops: [0x0] bridge[2]: drm_aux_hpd_bridge_funcs refcount: 5 type: [10] DP OF: /soc/i2c@2ac50000/typec-portc@22/connector:usb-c-connector ops: [0x4] hpd Signed-off-by: Sebastian Reichel --- drivers/gpu/drm/bridge/synopsys/dw-dp.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/bridge/synopsys/dw-dp.c b/drivers/gpu/drm/brid= ge/synopsys/dw-dp.c index 222862d962d9..c3a108f1faa9 100644 --- a/drivers/gpu/drm/bridge/synopsys/dw-dp.c +++ b/drivers/gpu/drm/bridge/synopsys/dw-dp.c @@ -1978,7 +1978,7 @@ struct dw_dp *dw_dp_bind(struct device *dev, struct d= rm_encoder *encoder, { struct platform_device *pdev =3D to_platform_device(dev); struct dw_dp *dp; - struct drm_bridge *bridge; + struct drm_bridge *bridge, *next_bridge; void __iomem *res; int ret; =20 @@ -2072,6 +2072,20 @@ struct dw_dp *dw_dp_bind(struct device *dev, struct = drm_encoder *encoder, goto unregister_aux; } =20 + next_bridge =3D devm_drm_of_get_bridge(dev, dev->of_node, 1, 0); + if (IS_ERR(next_bridge)) { + ret =3D PTR_ERR(next_bridge); + dev_err_probe(dev, ret, "failed to get follow-up bridge.\n"); + goto unregister_aux; + } + + ret =3D drm_bridge_attach(encoder, next_bridge, bridge, + DRM_BRIDGE_ATTACH_NO_CONNECTOR); + if (ret) { + dev_err_probe(dev, ret, "Failed to attach next bridge\n"); + goto unregister_aux; + } + dw_dp_init_hw(dp); =20 ret =3D phy_init(dp->phy); --=20 2.53.0