From patchwork Thu Jun 23 08:03:42 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Saravana Kannan X-Patchwork-Id: 12891920 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7C5F6CCA47F for ; Thu, 23 Jun 2022 08:08:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229946AbiFWIIZ (ORCPT ); Thu, 23 Jun 2022 04:08:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51526 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229891AbiFWIIN (ORCPT ); Thu, 23 Jun 2022 04:08:13 -0400 Received: from mail-pl1-x649.google.com (mail-pl1-x649.google.com [IPv6:2607:f8b0:4864:20::649]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 96078186CE for ; Thu, 23 Jun 2022 01:08:10 -0700 (PDT) Received: by mail-pl1-x649.google.com with SMTP id t1-20020a170902e84100b001689cab0be3so11267171plg.11 for ; Thu, 23 Jun 2022 01:08:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=zZJrI+RbMRkrmHfhlt/j/MmMDuQlYzWrcboe4IkTaNE=; b=X3cn1S0CzIm4FWlNm7Ryg2/2EhJ00v8hxnIIDKiY0q1xKgtQnRGMiDKSXOEkZbvZhP 4uuCwD503iseCprVScSWZ4pQAjCrhi5cSXg2767cmkjO+dH6ZtTzMD8IgkJml4P1nS5Y KRkC8Q3fbKTSbVuwwYgY40M7YBq7K4GfinxXw1gKkP9ckyTCf5jZEnxIrlT4m5ctvBId aFDhAWxWEib2HfJK+X0wU6lZpwgwBLpDzcd7ufJxyOwRN0hhKAFrayM0jxIwcjjWVfRA dKJY5P21I5RqGps1wnOhf0Q0ky3RmaD6EK6D2UEz4teRjKPN/KhAkLDsA4wB4nGaqEqu RHUw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=zZJrI+RbMRkrmHfhlt/j/MmMDuQlYzWrcboe4IkTaNE=; b=lYZbQ0HdxwqxzYqCBBQzVXREMrsj8vb2oGCSZOuB1fWD16shoGa1e9nUCw8KExpZp/ YuOw9JDsyy4wkKFxC9hEBjuMZcsP6tGAdQbxy2A1eyHYRJikYYt9zx9fjRQ+od4leZn+ HOHKPHOjnkKvtcke/TMvhWx9JBi3J3EtqZxIWa/AW9ngsZGm3ihDgsRbcdyYd4xPaO+K nQ/GmPp80x4ujP0nmcUvN3/TiDva60YavxH2gKsACnQXlpwwRjria0ji8UnThj86+rcv 43bSLDx0ciRamOPvOnQgbVEzz9NTVxJHNFRBRcb4Le27XE/yvGBFFcxquYLfrr1eBYQR OdUg== X-Gm-Message-State: AJIora9ReOzXxTLwYhr+xZd4t2/yry7K9yZmApsTAVnoHG2LRg3OS4Rj FCPs2wIOXo9LDX82yrwgY7hfDBkgqnfWZ1k= X-Google-Smtp-Source: AGRyM1tnEDDd6vXWrrgmwo6F71ebTbd/zg3maYPwEQqNaZ5fOSmTNlY8C2FC3Fw0+TpkwTsE/6rFVWhkzcP3DDw= X-Received: from saravanak.san.corp.google.com ([2620:15c:2d:3:8b2d:9894:73a4:8e1f]) (user=saravanak job=sendgmr) by 2002:a17:902:8309:b0:167:9a4c:cd58 with SMTP id bd9-20020a170902830900b001679a4ccd58mr37342398plb.166.1655971689836; Thu, 23 Jun 2022 01:08:09 -0700 (PDT) Date: Thu, 23 Jun 2022 01:03:42 -0700 In-Reply-To: <20220623080344.783549-1-saravanak@google.com> Message-Id: <20220623080344.783549-2-saravanak@google.com> Mime-Version: 1.0 References: <20220623080344.783549-1-saravanak@google.com> X-Mailer: git-send-email 2.37.0.rc0.161.g10f37bed90-goog Subject: [PATCH v2 1/2] driver core: fw_devlink: Allow firmware to mark devices as best effort From: Saravana Kannan To: Greg Kroah-Hartman , "Rafael J. Wysocki" , Rob Herring , Frank Rowand , Andy Shevchenko , Daniel Scally , Heikki Krogerus , Sakari Ailus , Len Brown , Saravana Kannan Cc: sascha hauer , peng fan , kevin hilman , ulf hansson , len brown , pavel machek , joerg roedel , will deacon , andrew lunn , heiner kallweit , russell king , "david s. miller" , eric dumazet , jakub kicinski , paolo abeni , linus walleij , hideaki yoshifuji , david ahern , kernel-team@android.com, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, iommu@lists.linux-foundation.org, netdev@vger.kernel.org, linux-gpio@vger.kernel.org, kernel@pengutronix.de, devicetree@vger.kernel.org, linux-acpi@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org When firmware sets the FWNODE_FLAG_BEST_EFFORT flag for a fwnode, fw_devlink will do a best effort ordering for that device where it'll only enforce the probe/suspend/resume ordering of that device with suppliers that have drivers. The driver of that device can then decide if it wants to defer probe or probe without the suppliers. This will be useful for avoid probe delays of the console device that were caused by commit 71066545b48e ("driver core: Set fw_devlink.strict=1 by default"). Fixes: 71066545b48e ("driver core: Set fw_devlink.strict=1 by default") Reported-by: Sascha Hauer Reported-by: Peng Fan Signed-off-by: Saravana Kannan Tested-by: Peng Fan --- drivers/base/core.c | 3 ++- include/linux/fwnode.h | 4 ++++ 2 files changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/base/core.c b/drivers/base/core.c index 839f64485a55..ccdd5b4295de 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -968,7 +968,8 @@ static void device_links_missing_supplier(struct device *dev) static bool dev_is_best_effort(struct device *dev) { - return fw_devlink_best_effort && dev->can_match; + return (fw_devlink_best_effort && dev->can_match) || + (dev->fwnode && (dev->fwnode->flags & FWNODE_FLAG_BEST_EFFORT)); } /** diff --git a/include/linux/fwnode.h b/include/linux/fwnode.h index 9a81c4410b9f..89b9bdfca925 100644 --- a/include/linux/fwnode.h +++ b/include/linux/fwnode.h @@ -27,11 +27,15 @@ struct device; * driver needs its child devices to be bound with * their respective drivers as soon as they are * added. + * BEST_EFFORT: The fwnode/device needs to probe early and might be missing some + * suppliers. Only enforce ordering with suppliers that have + * drivers. */ #define FWNODE_FLAG_LINKS_ADDED BIT(0) #define FWNODE_FLAG_NOT_DEVICE BIT(1) #define FWNODE_FLAG_INITIALIZED BIT(2) #define FWNODE_FLAG_NEEDS_CHILD_BOUND_ON_ADD BIT(3) +#define FWNODE_FLAG_BEST_EFFORT BIT(4) struct fwnode_handle { struct fwnode_handle *secondary;