From patchwork Thu Jan 12 04:20:57 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: 13097484 Received: from mail-pf1-f169.google.com (mail-pf1-f169.google.com [209.85.210.169]) (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 815B0378 for ; Thu, 12 Jan 2023 04:21:26 +0000 (UTC) Received: by mail-pf1-f169.google.com with SMTP id s3so10421143pfd.12 for ; Wed, 11 Jan 2023 20:21:26 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; 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=H1TkdCYd6ACDb822V5ymCJqJsoUWZt84bjeNRJjxiCU=; b=jdJO71CDHt8Fc8jxM5omcbFXpLk35O/tD3XpCg8d1m2smMqB62v74cke8eZw48ZwPG 22NL7DuFBjv0SkgEL2IMFOkU+iJ4QR+phjPOZKqJDGP8XkkfHFuZhL7jJgm8yFsgXAW5 animO4QOKlwWfmaPFXh/tkYURQg5TaxD8tqas= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; 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=H1TkdCYd6ACDb822V5ymCJqJsoUWZt84bjeNRJjxiCU=; b=0IWbv2ILuuTDYXfObUl2oNvL9W44uPlUIwSRGN1ZGdId4M7JnVgdYYXUi9jVhYFlZf ckbxnbd0JscD7BLfEvrvERnEJ9rpSZv9Yz4budO3TMEIMiMkKc9uCx8yCsILrahpn6Wh xOPOkrwD2jLsxFvLmi7JpBH7jevdzqyt4fm/1+2irO2AL3yo+ZlXLFiQdHQ61ooAFop3 fjhXFZPy0cC7d9wBmMhAlxZDmaiT1O9UUsM1Yf9/HoNBn4Sm3jIQIT1LoQrNq28eDM01 a7tWA0XK+zLaD/l+43eJSlT/2GGcpxh2VlDpNcN5lsbSvCzxUaxO7glU7DYi1Ix/k8qg hQvw== X-Gm-Message-State: AFqh2ko5KeDiccvNJnomvWj//55/QdCF967OpWjX+9svFI9PB7psn1Df CL0H8y97fjmIWs9L/j5L/5uetw== X-Google-Smtp-Source: AMrXdXunxxrhYRRDUDJHVwSXPtNUX4tq0z7jXhkdsSwjCxWMlm3FbrS/yJLgygcIslXcr8QNMuZ1Pw== X-Received: by 2002:a05:6a00:2997:b0:582:1f25:5b8 with SMTP id cj23-20020a056a00299700b005821f2505b8mr44070232pfb.19.1673497286002; Wed, 11 Jan 2023 20:21:26 -0800 (PST) Received: from treapking.tpe.corp.google.com ([2401:fa00:1:10:594f:5484:7591:d074]) by smtp.gmail.com with ESMTPSA id s8-20020aa78bc8000000b00582579cb0e0sm5519478pfd.129.2023.01.11.20.21.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 11 Jan 2023 20:21:25 -0800 (PST) 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: Stephen Boyd , Pin-yen Lin , =?utf-8?q?N=C3=ADcolas_F_=2E_R_=2E_A_=2E_Prado?= , Marek Vasut , AngeloGioacchino Del Regno , devicetree@vger.kernel.org, dri-devel@lists.freedesktop.org, Javier Martinez Canillas , Lyude Paul , chrome-platform@lists.linux.dev, Xin Ji , Thomas Zimmermann , linux-kernel@vger.kernel.org, Allen Chen , linux-acpi@vger.kernel.org, Hsin-Yi Wang , Chen-Yu Tsai Subject: [PATCH v10 2/9] platform/chrome: cros_ec_typec: Purge blocking switch devlinks Date: Thu, 12 Jan 2023 12:20:57 +0800 Message-Id: <20230112042104.4107253-3-treapking@chromium.org> X-Mailer: git-send-email 2.39.0.314.g84b9a713c41-goog In-Reply-To: <20230112042104.4107253-1-treapking@chromium.org> References: <20230112042104.4107253-1-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 --- 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 2a7ff14dc37e..302474a647cc 100644 --- a/drivers/platform/chrome/cros_ec_typec.c +++ b/drivers/platform/chrome/cros_ec_typec.c @@ -382,6 +382,16 @@ 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) {