From patchwork Wed Mar 22 10:46:31 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pin-yen Lin X-Patchwork-Id: 13183896 Received: from mail-pl1-f177.google.com (mail-pl1-f177.google.com [209.85.214.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1482823D4 for ; Wed, 22 Mar 2023 10:46:59 +0000 (UTC) Received: by mail-pl1-f177.google.com with SMTP id le6so18846630plb.12 for ; Wed, 22 Mar 2023 03:46:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1679482019; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=4+5+KeEGvj5Q2Ho8473pkowWeg3TWrycUDtZWzvt1Sk=; b=UGpIC/Esbs9QLxaTfp3b+iA9ZmIWKea/P1K5lNMblbFya52zYzHjcYV9Z1dh4jHxNT 5aHsz059WF//B+UsDC8QyXJ5zQHDy4bbjSVoqWq64B6RkpGTSGA24V1Tz7DMUrOe12jI xFPBgkoHzetP5XlAMPY3aZX7q415j8RX4XHXY= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1679482019; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=4+5+KeEGvj5Q2Ho8473pkowWeg3TWrycUDtZWzvt1Sk=; b=yEWnMvHzLPM2hJOEExKuna/kG0PfextYwkn6+1LTC/nBiysqWrJFzsaZrZVu+vPJYD lE6PSwUiyG4nK1SUp1khdP5WrcS16dd1VU38QDK33EBokDvwhdgU+HuijUXM697Q4W0r l5C9v/dN8HATvpCOdSZDIgclfbzp8vNhtqxKhriR9Xjf7Jm1MCz6nx05pClSx+cI+lXQ 54vKs/KNj8Z3u0YDU+r/RClt9LWOsXlCsn0wfEVFyfNyN9UOBB20y0p9oM0O1m2MF1ev QHlythz6OEUO5/N7HRxUblAJ0GK4HbowArnBaz7Vq5EwKq9DjArZPjcW6yD1s9BZEGpR AKhg== X-Gm-Message-State: AO0yUKWZHndPzdHL36c9vxg5T5Vhf0bo+aoPYoIpnr0ZxxRSqpewh58h RNVc3jfdwtH2qJFO8Qk/K/5i8A== X-Google-Smtp-Source: AK7set90wpsycDChw65ny437J2h3RkWbTdHA+NGhsdfPnCYIlZE0iipJ0qCRLlLh4eP/BKLB8wMrnA== X-Received: by 2002:a17:90a:50:b0:23f:ebf2:d3e9 with SMTP id 16-20020a17090a005000b0023febf2d3e9mr3333274pjb.6.1679482019432; Wed, 22 Mar 2023 03:46:59 -0700 (PDT) Received: from treapking.tpe.corp.google.com ([2401:fa00:1:10:343d:79bf:55f9:1da5]) by smtp.gmail.com with ESMTPSA id hg4-20020a17090b300400b002340d317f3esm9508742pjb.52.2023.03.22.03.46.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 22 Mar 2023 03:46:59 -0700 (PDT) From: Pin-yen Lin To: Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , David Airlie , Daniel Vetter , Rob Herring , Krzysztof Kozlowski , Andy Shevchenko , Daniel Scally , Heikki Krogerus , Sakari Ailus , Greg Kroah-Hartman , "Rafael J . Wysocki" , Prashant Malani , Benson Leung , Guenter Roeck Cc: Xin Ji , linux-kernel@vger.kernel.org, Thomas Zimmermann , linux-acpi@vger.kernel.org, Javier Martinez Canillas , AngeloGioacchino Del Regno , Pin-yen Lin , Hsin-Yi Wang , Lyude Paul , =?utf-8?q?N=C3=ADcolas_F_=2E_R_=2E_A_=2E_Pra?= =?utf-8?q?do?= , Allen Chen , dri-devel@lists.freedesktop.org, Marek Vasut , Stephen Boyd , chrome-platform@lists.linux.dev, devicetree@vger.kernel.org, Chen-Yu Tsai Subject: [PATCH v14 02/10] platform/chrome: cros_ec_typec: Purge blocking switch devlinks Date: Wed, 22 Mar 2023 18:46:31 +0800 Message-Id: <20230322104639.221402-3-treapking@chromium.org> X-Mailer: git-send-email 2.40.0.rc1.284.g88254d51c5-goog In-Reply-To: <20230322104639.221402-1-treapking@chromium.org> References: <20230322104639.221402-1-treapking@chromium.org> Precedence: bulk X-Mailing-List: chrome-platform@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Prashant Malani 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 Signed-off-by: Pin-yen Lin Reviewed-by: Chen-Yu Tsai Tested-by: Chen-Yu Tsai Acked-by: Heikki Krogerus Reviewed-by: AngeloGioacchino Del Regno --- (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 a673c3342470..5911cd9640cb 100644 --- a/drivers/platform/chrome/cros_ec_typec.c +++ b/drivers/platform/chrome/cros_ec_typec.c @@ -325,6 +325,16 @@ 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) {