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[34.125.73.210]) by smtp.gmail.com with UTF8SMTPSA id d9443c01a7336-201f038a84esm67020355ad.189.2024.08.19.15.38.52 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 19 Aug 2024 15:38:53 -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 , Alexandre Belloni , Andy Shevchenko , Daniel Scally , Greg Kroah-Hartman , Heikki Krogerus , Ivan Orlov , linux-acpi@vger.kernel.org, linux-usb@vger.kernel.org, Mika Westerberg , "Rafael J . Wysocki" , Sakari Ailus , Vinod Koul Subject: [PATCH v3 08/17] drm/bridge: dp_typec: Add "no-hpd" support Date: Mon, 19 Aug 2024 15:38:22 -0700 Message-ID: <20240819223834.2049862-9-swboyd@chromium.org> X-Mailer: git-send-email 2.46.0.184.g6999bdac58-goog In-Reply-To: <20240819223834.2049862-1-swboyd@chromium.org> References: <20240819223834.2049862-1-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" Add support for HPD coming from somewhere else in the drm_bridge chain. Skip signaling HPD sate when "no-hpd" is present in the DT node backing the dp_typec bridge. Add this support because 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 level 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. 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 | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/bridge/aux-hpd-bridge.c b/drivers/gpu/drm/brid= ge/aux-hpd-bridge.c index 3d33f7936cbc..adafda4f128f 100644 --- a/drivers/gpu/drm/bridge/aux-hpd-bridge.c +++ b/drivers/gpu/drm/bridge/aux-hpd-bridge.c @@ -22,6 +22,7 @@ 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 { @@ -354,6 +355,8 @@ 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); } @@ -662,6 +665,7 @@ 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) @@ -670,6 +674,9 @@ static int drm_aux_hpd_bridge_probe(struct auxiliary_de= vice *auxdev, bridge =3D &hpd_data->bridge; bridge->funcs =3D &drm_dp_typec_bridge_funcs; typec_bridge_dev =3D to_drm_dp_typec_bridge_dev(dev); + hpd_data->no_hpd =3D of_property_read_bool(np, "no-hpd"); + if (!hpd_data->no_hpd) + bridge->ops =3D DRM_BRIDGE_OP_HPD; memcpy(typec_data->dp_lanes, dp_lanes, sizeof(typec_data->dp_lanes)); ret =3D drm_dp_typec_bridge_probe_typec_ports(typec_data, typec_bridge_d= ev, np); if (ret) @@ -679,8 +686,7 @@ 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->of_node =3D np; bridge->type =3D DRM_MODE_CONNECTOR_DisplayPort; =20 auxiliary_set_drvdata(auxdev, hpd_data); --=20 https://chromeos.dev