From: Pin-yen Lin <treapking@chromium.org> To: Andrzej Hajda <andrzej.hajda@intel.com>, Neil Armstrong <neil.armstrong@linaro.org>, Robert Foss <rfoss@kernel.org>, Laurent Pinchart <Laurent.pinchart@ideasonboard.com>, Jonas Karlman <jonas@kwiboo.se>, Jernej Skrabec <jernej.skrabec@gmail.com>, David Airlie <airlied@gmail.com>, Daniel Vetter <daniel@ffwll.ch>, Rob Herring <robh+dt@kernel.org>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>, Andy Shevchenko <andriy.shevchenko@linux.intel.com>, Daniel Scally <djrscally@gmail.com>, Heikki Krogerus <heikki.krogerus@linux.intel.com>, Sakari Ailus <sakari.ailus@linux.intel.com>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, "Rafael J . Wysocki" <rafael@kernel.org>, Prashant Malani <pmalani@chromium.org>, Benson Leung <bleung@chromium.org>, Guenter Roeck <groeck@chromium.org> Cc: "Xin Ji" <xji@analogixsemi.com>, "Javier Martinez Canillas" <javierm@redhat.com>, "Lyude Paul" <lyude@redhat.com>, linux-kernel@vger.kernel.org, "Pin-yen Lin" <treapking@chromium.org>, "AngeloGioacchino Del Regno" <angelogioacchino.delregno@collabora.com>, chrome-platform@lists.linux.dev, "Nícolas F . R . A . Prado" <nfraprado@collabora.com>, "Marek Vasut" <marex@denx.de>, "Hsin-Yi Wang" <hsinyi@chromium.org>, devicetree@vger.kernel.org, "Allen Chen" <allen.chen@ite.com.tw>, dri-devel@lists.freedesktop.org, "Thomas Zimmermann" <tzimmermann@suse.de>, "Stephen Boyd" <swboyd@chromium.org>, linux-acpi@vger.kernel.org, "Chen-Yu Tsai" <wenst@chromium.org> Subject: [PATCH v13 02/10] platform/chrome: cros_ec_typec: Purge blocking switch devlinks Date: Fri, 3 Mar 2023 22:33:42 +0800 [thread overview] Message-ID: <20230303143350.815623-3-treapking@chromium.org> (raw) In-Reply-To: <20230303143350.815623-1-treapking@chromium.org> From: Prashant Malani <pmalani@chromium.org> When using OF graph, the fw_devlink code will create links between the individual port driver (cros-ec-typec here) and the parent device for a Type-C switch (like mode-switch). Since the mode-switch will in turn have the usb-c-connector (i.e the child of the port driver) as a supplier, fw_devlink will not be able to resolve the cyclic dependency correctly. As a result, the mode-switch driver probe() never runs, so mode-switches are never registered. Because of that, the port driver probe constantly fails with -EPROBE_DEFER, because the Type-C connector class requires all switch devices to be registered prior to port registration. To break this deadlock and allow the mode-switch registration to occur, purge all the usb-c-connector nodes' absent suppliers. This eliminates the connector as a supplier for a switch and allows it to be probed. Signed-off-by: Prashant Malani <pmalani@chromium.org> Signed-off-by: Pin-yen Lin <treapking@chromium.org> Reviewed-by: Chen-Yu Tsai <wenst@chromium.org> Tested-by: Chen-Yu Tsai <wenst@chromium.org> Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> --- (no changes since v11) Changes in v11: - Collected Acked-by tag Changes in v10: - Collected Reviewed-by and Tested-by tags Changes in v7: - Fix the long comment lines Changes in v6: - New in v6 drivers/platform/chrome/cros_ec_typec.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c index 001b0de95a46..bbc95a3ba5a7 100644 --- a/drivers/platform/chrome/cros_ec_typec.c +++ b/drivers/platform/chrome/cros_ec_typec.c @@ -385,6 +385,16 @@ static int cros_typec_init_ports(struct cros_typec_data *typec) return -EINVAL; } + /* + * OF graph may have set up some device links with switches, + * since connectors have their own compatible. Purge these + * to avoid a deadlock in switch probe (the switch mistakenly + * assumes the connector is a supplier). + */ + if (dev_of_node(dev)) + device_for_each_child_node(dev, fwnode) + fw_devlink_purge_absent_suppliers(fwnode); + /* DT uses "reg" to specify port number. */ port_prop = dev->of_node ? "reg" : "port-number"; device_for_each_child_node(dev, fwnode) { -- 2.40.0.rc0.216.gc4246ad0f0-goog
WARNING: multiple messages have this Message-ID (diff)
From: Pin-yen Lin <treapking@chromium.org> To: Andrzej Hajda <andrzej.hajda@intel.com>, Neil Armstrong <neil.armstrong@linaro.org>, Robert Foss <rfoss@kernel.org>, Laurent Pinchart <Laurent.pinchart@ideasonboard.com>, Jonas Karlman <jonas@kwiboo.se>, Jernej Skrabec <jernej.skrabec@gmail.com>, David Airlie <airlied@gmail.com>, Daniel Vetter <daniel@ffwll.ch>, Rob Herring <robh+dt@kernel.org>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>, Andy Shevchenko <andriy.shevchenko@linux.intel.com>, Daniel Scally <djrscally@gmail.com>, Heikki Krogerus <heikki.krogerus@linux.intel.com>, Sakari Ailus <sakari.ailus@linux.intel.com>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, "Rafael J . Wysocki" <rafael@kernel.org>, Prashant Malani <pmalani@chromium.org>, Benson Leung <bleung@chromium.org>, Guenter Roeck <groeck@chromium.org> Cc: "Marek Vasut" <marex@denx.de>, chrome-platform@lists.linux.dev, linux-acpi@vger.kernel.org, "Nícolas F . R . A . Prado" <nfraprado@collabora.com>, devicetree@vger.kernel.org, "Allen Chen" <allen.chen@ite.com.tw>, "Chen-Yu Tsai" <wenst@chromium.org>, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, "Javier Martinez Canillas" <javierm@redhat.com>, "Pin-yen Lin" <treapking@chromium.org>, "Thomas Zimmermann" <tzimmermann@suse.de>, "Hsin-Yi Wang" <hsinyi@chromium.org>, "Stephen Boyd" <swboyd@chromium.org>, "Xin Ji" <xji@analogixsemi.com>, "AngeloGioacchino Del Regno" <angelogioacchino.delregno@collabora.com> Subject: [PATCH v13 02/10] platform/chrome: cros_ec_typec: Purge blocking switch devlinks Date: Fri, 3 Mar 2023 22:33:42 +0800 [thread overview] Message-ID: <20230303143350.815623-3-treapking@chromium.org> (raw) In-Reply-To: <20230303143350.815623-1-treapking@chromium.org> From: Prashant Malani <pmalani@chromium.org> When using OF graph, the fw_devlink code will create links between the individual port driver (cros-ec-typec here) and the parent device for a Type-C switch (like mode-switch). Since the mode-switch will in turn have the usb-c-connector (i.e the child of the port driver) as a supplier, fw_devlink will not be able to resolve the cyclic dependency correctly. As a result, the mode-switch driver probe() never runs, so mode-switches are never registered. Because of that, the port driver probe constantly fails with -EPROBE_DEFER, because the Type-C connector class requires all switch devices to be registered prior to port registration. To break this deadlock and allow the mode-switch registration to occur, purge all the usb-c-connector nodes' absent suppliers. This eliminates the connector as a supplier for a switch and allows it to be probed. Signed-off-by: Prashant Malani <pmalani@chromium.org> Signed-off-by: Pin-yen Lin <treapking@chromium.org> Reviewed-by: Chen-Yu Tsai <wenst@chromium.org> Tested-by: Chen-Yu Tsai <wenst@chromium.org> Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> --- (no changes since v11) Changes in v11: - Collected Acked-by tag Changes in v10: - Collected Reviewed-by and Tested-by tags Changes in v7: - Fix the long comment lines Changes in v6: - New in v6 drivers/platform/chrome/cros_ec_typec.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c index 001b0de95a46..bbc95a3ba5a7 100644 --- a/drivers/platform/chrome/cros_ec_typec.c +++ b/drivers/platform/chrome/cros_ec_typec.c @@ -385,6 +385,16 @@ static int cros_typec_init_ports(struct cros_typec_data *typec) return -EINVAL; } + /* + * OF graph may have set up some device links with switches, + * since connectors have their own compatible. Purge these + * to avoid a deadlock in switch probe (the switch mistakenly + * assumes the connector is a supplier). + */ + if (dev_of_node(dev)) + device_for_each_child_node(dev, fwnode) + fw_devlink_purge_absent_suppliers(fwnode); + /* DT uses "reg" to specify port number. */ port_prop = dev->of_node ? "reg" : "port-number"; device_for_each_child_node(dev, fwnode) { -- 2.40.0.rc0.216.gc4246ad0f0-goog
next prev parent reply other threads:[~2023-03-03 14:34 UTC|newest] Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top 2023-03-03 14:33 [PATCH v13 00/10] Register Type-C mode-switch in DP bridge endpoints Pin-yen Lin 2023-03-03 14:33 ` Pin-yen Lin 2023-03-03 14:33 ` [PATCH v13 01/10] device property: Add remote endpoint to devcon matcher Pin-yen Lin 2023-03-03 14:33 ` Pin-yen Lin 2023-03-06 11:43 ` Andy Shevchenko 2023-03-06 11:43 ` Andy Shevchenko 2023-03-06 11:54 ` Sakari Ailus 2023-03-06 11:54 ` Sakari Ailus 2023-03-08 7:30 ` Heikki Krogerus 2023-03-08 7:30 ` Heikki Krogerus 2023-03-03 14:33 ` Pin-yen Lin [this message] 2023-03-03 14:33 ` [PATCH v13 02/10] platform/chrome: cros_ec_typec: Purge blocking switch devlinks Pin-yen Lin 2023-03-03 14:33 ` [PATCH v13 03/10] drm/display: Add Type-C switch helpers Pin-yen Lin 2023-03-03 14:33 ` Pin-yen Lin 2023-03-06 11:49 ` Andy Shevchenko 2023-03-06 11:49 ` Andy Shevchenko 2023-03-08 10:20 ` Pin-yen Lin 2023-03-08 10:20 ` Pin-yen Lin 2023-03-08 15:28 ` Andy Shevchenko 2023-03-08 15:28 ` Andy Shevchenko 2023-03-09 10:20 ` Pin-yen Lin 2023-03-09 10:20 ` Pin-yen Lin 2023-03-03 14:33 ` [PATCH v13 04/10] dt-bindings: display: bridge: anx7625: Add mode-switch support Pin-yen Lin 2023-03-03 14:33 ` Pin-yen Lin 2023-03-03 14:33 ` [PATCH v13 05/10] drm/bridge: anx7625: Check for Type-C during panel registration Pin-yen Lin 2023-03-03 14:33 ` Pin-yen Lin 2023-03-06 11:51 ` Andy Shevchenko 2023-03-06 11:51 ` Andy Shevchenko 2023-03-08 10:25 ` Pin-yen Lin 2023-03-08 10:25 ` Pin-yen Lin 2023-03-03 14:33 ` [PATCH v13 06/10] drm/bridge: Remove redundant i2c_client in anx7625/it6505 Pin-yen Lin 2023-03-03 14:33 ` Pin-yen Lin 2023-03-03 14:33 ` [PATCH v13 07/10] drm/bridge: anx7625: Register Type C mode switches Pin-yen Lin 2023-03-03 14:33 ` Pin-yen Lin 2023-03-06 11:55 ` Andy Shevchenko 2023-03-06 11:55 ` Andy Shevchenko 2023-03-08 13:44 ` Pin-yen Lin 2023-03-08 13:44 ` Pin-yen Lin 2023-03-03 14:33 ` [PATCH v13 08/10] dt-bindings: display: bridge: it6505: Add mode-switch support Pin-yen Lin 2023-03-03 14:33 ` Pin-yen Lin 2023-03-03 14:33 ` [PATCH v13 09/10] drm/bridge: it6505: Fix Kconfig indentation Pin-yen Lin 2023-03-03 14:33 ` Pin-yen Lin 2023-03-03 14:33 ` [PATCH v13 10/10] drm/bridge: it6505: Register Type C mode switches Pin-yen Lin 2023-03-03 14:33 ` Pin-yen Lin 2023-03-04 10:26 ` kernel test robot 2023-03-06 12:02 ` Andy Shevchenko 2023-03-06 12:02 ` Andy Shevchenko 2023-03-08 13:51 ` Pin-yen Lin 2023-03-08 13:51 ` Pin-yen Lin 2023-03-08 15:31 ` Andy Shevchenko 2023-03-08 15:31 ` Andy Shevchenko 2023-03-09 10:21 ` Pin-yen Lin 2023-03-09 10:21 ` Pin-yen Lin
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