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[34.125.73.210]) by smtp.gmail.com with UTF8SMTPSA id d2e1a72fcca58-7127af1999fsm151333b3a.169.2024.08.14.17.34.30 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 14 Aug 2024 17:34:30 -0700 (PDT) From: Stephen Boyd To: chrome-platform@lists.linux.dev Cc: linux-kernel@vger.kernel.org, patches@lists.linux.dev, devicetree@vger.kernel.org, Douglas Anderson , Pin-yen Lin , Andrzej Hajda , Benson Leung , Conor Dooley , Daniel Vetter , David Airlie , Dmitry Baryshkov , dri-devel@lists.freedesktop.org, Guenter Roeck , Jernej Skrabec , Jonas Karlman , Krzysztof Kozlowski , Laurent Pinchart , Lee Jones , Maarten Lankhorst , Maxime Ripard , Neil Armstrong , Prashant Malani , Robert Foss , Rob Herring , Thomas Zimmermann , Tzung-Bi Shih Subject: [PATCH v2 05/11] drm/bridge: dp_typec: Add "no-hpd" support Date: Wed, 14 Aug 2024 17:34:10 -0700 Message-ID: <20240815003417.1175506-6-swboyd@chromium.org> X-Mailer: git-send-email 2.46.0.76.ge559c4bf1a-goog In-Reply-To: <20240815003417.1175506-1-swboyd@chromium.org> References: <20240815003417.1175506-1-swboyd@chromium.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Some EC firmwares on Trogdor/Strongbad boards don't properly indicate the state of the DP HPD level on a type-c port. The EC only indicates that DP mode is entered or exited for a type-c port. The HPD state is expressed to the DP controller via a pin on the AP that the EC drives high or low when the type-c port partner (i.e. monitor) asserts or deasserts HPD. TL;DR: These devices don't support HPD signaling from the type-c code paths. Add support for HPD coming from somewhere else in the bridge chain. Callers can set the struct drm_dp_typec_bridge_desc::no_hpd member to indicate that HPD shouldn't be signaled from this bridge. Cc: Prashant Malani Cc: Benson Leung Cc: Tzung-Bi Shih Cc: Cc: Pin-yen Lin Cc: Dmitry Baryshkov Signed-off-by: Stephen Boyd --- drivers/gpu/drm/bridge/aux-hpd-bridge.c | 12 +++++++++++- include/drm/bridge/aux-bridge.h | 2 ++ 2 files changed, 13 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/bridge/aux-hpd-bridge.c b/drivers/gpu/drm/brid= ge/aux-hpd-bridge.c index 79652d27db40..a5a434b7d5ec 100644 --- a/drivers/gpu/drm/bridge/aux-hpd-bridge.c +++ b/drivers/gpu/drm/bridge/aux-hpd-bridge.c @@ -20,6 +20,7 @@ static DEFINE_IDA(drm_aux_hpd_bridge_ida); struct drm_aux_hpd_bridge_data { struct drm_bridge bridge; struct device *dev; + bool no_hpd; }; =20 enum dp_lane { @@ -54,6 +55,7 @@ to_drm_dp_typec_bridge_data(struct drm_bridge *bridge) struct drm_dp_typec_bridge_dev { struct auxiliary_device adev; size_t max_lanes; + bool no_hpd; }; =20 static inline struct drm_dp_typec_bridge_dev * @@ -232,6 +234,7 @@ devm_drm_dp_typec_bridge_alloc(struct device *parent, c= onst struct drm_dp_typec_ adev->dev.release =3D drm_dp_typec_bridge_release; adev->dev.platform_data =3D of_node_get(desc->of_node); typec_bridge_dev->max_lanes =3D desc->num_dp_lanes; + typec_bridge_dev->no_hpd =3D desc->no_hpd; =20 ret =3D auxiliary_device_init(adev); if (ret) { @@ -278,6 +281,8 @@ void drm_aux_hpd_bridge_notify(struct device *dev, enum= drm_connector_status sta =20 if (!data) return; + if (data->no_hpd) + return; =20 drm_bridge_hpd_notify(&data->bridge, status); } @@ -467,6 +472,7 @@ static int drm_aux_hpd_bridge_probe(struct auxiliary_de= vice *auxdev, { struct device *dev =3D &auxdev->dev; struct drm_aux_hpd_bridge_data *hpd_data; + struct drm_dp_typec_bridge_dev *typec_bridge_dev; struct drm_dp_typec_bridge_data *typec_data; struct drm_bridge *bridge; u8 dp_lanes[] =3D { DP_ML0, DP_ML1, DP_ML2, DP_ML3 }; @@ -477,6 +483,7 @@ static int drm_aux_hpd_bridge_probe(struct auxiliary_de= vice *auxdev, return -ENOMEM; bridge =3D &hpd_data->bridge; bridge->funcs =3D &drm_aux_hpd_bridge_funcs; + bridge->ops =3D DRM_BRIDGE_OP_HPD; } else if (id->driver_data =3D=3D DRM_AUX_TYPEC_BRIDGE) { typec_data =3D devm_kzalloc(dev, sizeof(*typec_data), GFP_KERNEL); if (!typec_data) @@ -484,6 +491,10 @@ static int drm_aux_hpd_bridge_probe(struct auxiliary_d= evice *auxdev, hpd_data =3D &typec_data->hpd_bridge; bridge =3D &hpd_data->bridge; bridge->funcs =3D &drm_dp_typec_bridge_funcs; + typec_bridge_dev =3D to_drm_dp_typec_bridge_dev(dev); + if (!typec_bridge_dev->no_hpd) + bridge->ops =3D DRM_BRIDGE_OP_HPD; + hpd_data->no_hpd =3D typec_bridge_dev->no_hpd; memcpy(typec_data->dp_lanes, dp_lanes, sizeof(typec_data->dp_lanes)); } else { return -ENODEV; @@ -491,7 +502,6 @@ static int drm_aux_hpd_bridge_probe(struct auxiliary_de= vice *auxdev, =20 hpd_data->dev =3D dev; bridge->of_node =3D dev_get_platdata(dev); - bridge->ops =3D DRM_BRIDGE_OP_HPD; bridge->type =3D DRM_MODE_CONNECTOR_DisplayPort; =20 auxiliary_set_drvdata(auxdev, hpd_data); diff --git a/include/drm/bridge/aux-bridge.h b/include/drm/bridge/aux-bridg= e.h index 258b87c93623..13f5e98b4d31 100644 --- a/include/drm/bridge/aux-bridge.h +++ b/include/drm/bridge/aux-bridge.h @@ -28,10 +28,12 @@ struct drm_dp_typec_bridge_dev; * struct drm_dp_typec_bridge_desc - drm_dp_typec_bridge descriptor * @of_node: device node pointer corresponding to this bridge instance * @num_dp_lanes: number of input DP lanes possible (1, 2 or 4) + * @no_hpd: true if this bridge can't signal HPD state with drm_dp_typec_b= ridge_notify() */ struct drm_dp_typec_bridge_desc { struct device_node *of_node; size_t num_dp_lanes; + bool no_hpd; }; =20 enum usb_ss_lane { --=20 https://chromeos.dev