From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2D1EBC4727C for ; Thu, 1 Oct 2020 13:55:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D524C207F7 for ; Thu, 1 Oct 2020 13:55:27 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=baylibre-com.20150623.gappssmtp.com header.i=@baylibre-com.20150623.gappssmtp.com header.b="QU8ojKUo" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732342AbgJANz0 (ORCPT ); Thu, 1 Oct 2020 09:55:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52680 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732139AbgJANzY (ORCPT ); Thu, 1 Oct 2020 09:55:24 -0400 Received: from mail-vk1-xa44.google.com (mail-vk1-xa44.google.com [IPv6:2607:f8b0:4864:20::a44]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0BE96C0613E2 for ; Thu, 1 Oct 2020 06:55:24 -0700 (PDT) Received: by mail-vk1-xa44.google.com with SMTP id k78so1044045vka.10 for ; Thu, 01 Oct 2020 06:55:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=baylibre-com.20150623.gappssmtp.com; s=20150623; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=Y9wXc2FL41clBWsp7rvXXZv0AtepezSEVuo0O/dks5k=; b=QU8ojKUo1IKM4m+9xmGFyhjLAgwLGZ8/lgfMKhKu/eJCkfcHqYBgx9MzdTwNj6D6Pt HEydpLCUaOLBglg7GnCsW+IiSOGSvOqeAOL/Qc39KndUMe0g5FyVnRIByXrLMXhJ3LAd xq9DoPQ0BRLl31KnCk8at7/DwrItAFExlUW934H7zxd8FDPotNw1A1E+06tF/tUUho02 RCxJF+Ysai4yHjIxrYpYPmFj2a/OO/xukDKEIsOdMgCTwQRUn7Bww+NSD6v2kbHjnDrB bdsmPGOqWPirU/uDbZJUWj9phxavANppXzHFsJBh+B2VKgIzEad1U5MM2e+S+kqsMUpR VE/w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=Y9wXc2FL41clBWsp7rvXXZv0AtepezSEVuo0O/dks5k=; b=nRE4jB3NgjrLB5hK3Id0JG/UuA54udYc2Dp0zKwL3Vlw61ueblOwfrVlfehB6MOa/n u76Xva2ZVi7ABzL6q06mz17FQ7wcCWIyFjQlLP6gTrBD4bgX+ELlS3Juus+9Q0uYPFha lIu2nNvqSjn1meb0So1+M6rX2bjMfVpvsqVRBSag0EkyK7gE0hPER1kFh4YDDp8BORBI S5wVqJvrm4+o5rOnMSg2U0PsPUJHcqwowImn7fXjsx2C8TmcDqu/vvo/3MIDu+ZrU6aM RQnrXEPINAtHZVcf67EeAH7WMbHwlC9fmUNrSy6z310p73Bl/sqPCh0QlL9JprdPlFRW 3ihQ== X-Gm-Message-State: AOAM532zVZ3Ye2MFdD0dVUnB9qcDAFW1oP1QlU49qT2lZQjl+OZBve97 v+UkbkP2uB2ZxrZk+M+jW+LCv0Auqjswq0Gys48g3qFdlh8= X-Google-Smtp-Source: ABdhPJx90eHaIEvg1hFaxASdCVIylukofMwKDlZ7N7MQ6og3cNUASp0AJvobq/ik+73iaUTJ+jVSmoV3KLpyUYQIQIg= X-Received: by 2002:a1f:9913:: with SMTP id b19mr4797101vke.4.1601560523107; Thu, 01 Oct 2020 06:55:23 -0700 (PDT) MIME-Version: 1.0 References: <20201001132758.12280-1-aouledameur@baylibre.com> In-Reply-To: <20201001132758.12280-1-aouledameur@baylibre.com> From: Amjad Ouled-Ameur Date: Thu, 1 Oct 2020 15:55:11 +0200 Message-ID: Subject: Re: [PATCH] reset: Add reset controller API To: Philipp Zabel Cc: linux-kernel@vger.kernel.org, linux-amlogic@lists.infradead.org, linux-usb@vger.kernel.org, Jerome Brunet Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org An update on the patch title, since we don't add an API but extend it, The title should rather be: Add a new call to the reset framework Le jeu. 1 oct. 2020 =C3=A0 15:28, Amjad Ouled-Ameur a =C3=A9crit : > > The current reset framework API does not allow to release what is done by > reset_control_reset(), IOW decrement triggered_count. Add the new > reset_control_resettable() call to do so. > > When reset_control_reset() has been called once, the counter > triggered_count, in the reset framework, is incremented i.e the resource > under the reset is in-use and the reset should not be done again. > reset_control_resettable() would be the way to state that the resource is > no longer used and, that from the caller's perspective, the reset can be > fired again if necessary. > > This patch will fix a usb suspend warning seen on the libretech-cc > related to the shared reset line. This warning was addressed by the > previously reverted commit 7a410953d1fb ("usb: dwc3: meson-g12a: fix shar= ed > reset control use") > > Signed-off-by: Amjad Ouled-Ameur > Reported-by: Jerome Brunet > --- > drivers/reset/core.c | 57 +++++++++++++++++++++++++++++++++++++++++++ > include/linux/reset.h | 1 + > 2 files changed, 58 insertions(+) > > diff --git a/drivers/reset/core.c b/drivers/reset/core.c > index 01c0c7aa835c..53653d4b55c4 100644 > --- a/drivers/reset/core.c > +++ b/drivers/reset/core.c > @@ -207,6 +207,19 @@ static int reset_control_array_reset(struct reset_co= ntrol_array *resets) > return 0; > } > > +static int reset_control_array_resettable(struct reset_control_array *re= sets) > +{ > + int ret, i; > + > + for (i =3D 0; i < resets->num_rstcs; i++) { > + ret =3D reset_control_resettable(resets->rstc[i]); > + if (ret) > + return ret; > + } > + > + return 0; > +} > + > static int reset_control_array_assert(struct reset_control_array *resets= ) > { > int ret, i; > @@ -324,6 +337,50 @@ int reset_control_reset(struct reset_control *rstc) > } > EXPORT_SYMBOL_GPL(reset_control_reset); > > +/** > + * reset_control_resettable - decrements triggered_count of the controll= ed device > + * @rstc: reset controller > + * > + * On a shared reset line the actual reset pulse is only triggered once = for the > + * lifetime of the reset_control instance, except if this function is us= ed. > + * In fact, It decrements triggered_count that makes sure of not allowin= g > + * a reset if triggered_count is not null. > + * > + * This is a no-op in case triggered_count is already null i.e shared re= set line > + * is ready to be triggered. > + * > + * Consumers must not use reset_control_(de)assert on shared reset lines= when > + * reset_control_reset has been used. > + * > + * If rstc is NULL it is an optional clear and the function will just > + * return 0. > + */ > +int reset_control_resettable(struct reset_control *rstc) > +{ > + if (!rstc) > + return 0; > + > + if (WARN_ON(IS_ERR(rstc))) > + return -EINVAL; > + > + if (reset_control_is_array(rstc)) > + return reset_control_array_resettable(rstc_to_array(rstc)= ); > + > + if (rstc->shared) { > + if (WARN_ON(atomic_read(&rstc->deassert_count) !=3D 0)) > + return -EINVAL; > + > + if (atomic_read(&rstc->triggered_count) > 0) > + atomic_dec(&rstc->triggered_count); > + } else { > + if (!rstc->acquired) > + return -EPERM; > + } > + > + return 0; > +} > +EXPORT_SYMBOL_GPL(reset_control_resettable); > + > /** > * reset_control_assert - asserts the reset line > * @rstc: reset controller > diff --git a/include/linux/reset.h b/include/linux/reset.h > index 05aa9f440f48..ffa447d0d1d6 100644 > --- a/include/linux/reset.h > +++ b/include/linux/reset.h > @@ -13,6 +13,7 @@ struct reset_control; > #ifdef CONFIG_RESET_CONTROLLER > > int reset_control_reset(struct reset_control *rstc); > +int reset_control_resettable(struct reset_control *rstc); > int reset_control_assert(struct reset_control *rstc); > int reset_control_deassert(struct reset_control *rstc); > int reset_control_status(struct reset_control *rstc); > -- > 2.17.1 > --=20 Amjad Ouled-Ameur Embedded Linux Engineer - Villeneuve Loubet, FR Engit@BayLibre - At the Heart of Embedded Linux From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D9A4EC4727C for ; Thu, 1 Oct 2020 13:55:32 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client 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