From patchwork Fri Jul 9 02:23:19 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eizan Miyamoto X-Patchwork-Id: 12366509 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=-17.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 A86CDC07E96 for ; Fri, 9 Jul 2021 02:26:32 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 74AAC61459 for ; Fri, 9 Jul 2021 02:26:32 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 74AAC61459 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=chromium.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=mTwiSiLqrQaddH81N37zR231eO4+W3KKCLFJnftIAlc=; b=Qw0QX5jiqSfjct 5pHlBP8pI2aWy0J4wQ3EQYnGK2cq7dQHs0WE0Nii0ttyNMXsYkLjkAYqLD8OAhsWVD0+ceFAYqXrF GDWgYQqGGBCp3T/qnpdletoUPZAa+UPpdHpbc3iktlP0kDTPS/TcWUblIzf21SloDbH9YHKhGnqxC S0mmtk94QY5lSM/NsqHXwd7cxGt9DA7FaEfLqMRXy5xlyk8M90XtKbdFVh+G4/LBXzKLwo7pOtjwt 5blDGf0YoLe7SzPqDnYV8lmHOFm49Zk3g8VAmd2Xpt5PvIhtIymoVTdmEAz9G6YGeXnm3LxV27h77 OhEshHkpur6GeAg6TFMQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1m1gCR-000Zno-Jt; Fri, 09 Jul 2021 02:25:08 +0000 Received: from mail-pl1-x631.google.com ([2607:f8b0:4864:20::631]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1m1gBL-000ZCV-Sb for linux-arm-kernel@lists.infradead.org; Fri, 09 Jul 2021 02:24:02 +0000 Received: by mail-pl1-x631.google.com with SMTP id x3so4226962pll.5 for ; Thu, 08 Jul 2021 19:23:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=yyRKuMpZOVLMa4ikk2b2WHtFLwi/HwkthLMsBTXY13A=; b=IWtpsGTSq/C4xSGZlvADlPwHO6G6Ww/eiJiJPBh/CdQ3OSpkm2/Qc8qzIhH8VCI/k2 4g6VY55My77QLcxx0jrz/pQZsYOiQccuAJpf8Ue86AMV0y9vxD/8AWv2e4HONrMXHwCn 5rQ9+jdcrYBDVjjp+ys1/6sb85HzZhdJ6pXao= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=yyRKuMpZOVLMa4ikk2b2WHtFLwi/HwkthLMsBTXY13A=; b=eSNgEcD473IxLg92KOgM7RFway8tjYjUhU2YxVF+cfKxRMuawqe4RwKER1t/NZ6/EJ 6fPATSgXVQ/H3OxuOmAsa9eftIkdH19sSAPb92XaILk2fMn3rhvGBTIpO0MlxToDvdUn vmdAX5vfi53MAE5lO1CfyaSYcBJ9LlOdM0cTD8My9bIW/v5SBt6/p9eYgGdwtFecMQQO stQkXmWX+Njz+JBxlxSPoJRev4GdMdTgBHgwtdkd+zwi+CUcNwP+DpGtT9fCA+hXiFFm 0I7sEqjwKhUe5iBFbX5NPGPDm7nDkGzuCaTSd/1iMye68jxYOVp4OQe8oQXauOmfKXej jH4A== X-Gm-Message-State: AOAM53184xRIGKcAtvPZVjgbGD5r4/9qyxtvx9jbvqIMX2+W70ZPJUfU hcY1miu+uxr2kBiokL0mNWEQrg== X-Google-Smtp-Source: ABdhPJwntCC01ENSUlJbwElC+IreDjHP2lykfRnd4mpej6dBZDzdNhe6kJuLBbyLRuTcVMsgJ2dBjg== X-Received: by 2002:a17:90a:b110:: with SMTP id z16mr35021291pjq.170.1625797439023; Thu, 08 Jul 2021 19:23:59 -0700 (PDT) Received: from localhost ([2401:fa00:9:14:d956:2966:7910:2bd2]) by smtp.gmail.com with UTF8SMTPSA id g4sm5037932pgn.45.2021.07.08.19.23.54 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 08 Jul 2021 19:23:58 -0700 (PDT) From: Eizan Miyamoto To: linux-kernel@vger.kernel.org Cc: wenst@chromium.org, chunkuang.hu@kernel.org, yong.wu@mediatek.com, enric.balletbo@collabora.com, houlong.wei@mediatek.com, Eizan Miyamoto , Andrew-CT Chen , Matthias Brugger , Mauro Carvalho Chehab , Minghsiu Tsai , linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org, linux-mediatek@lists.infradead.org Subject: [PATCH v5 3/8] media: mtk-mdp: don't pm_run_time_get/put for master comp in clock_on Date: Fri, 9 Jul 2021 12:23:19 +1000 Message-Id: <20210709122040.v5.3.Ifd87681955689a08cce4c65e72ee5e8c6d09af95@changeid> X-Mailer: git-send-email 2.32.0.93.g670b81a890-goog In-Reply-To: <20210709022324.1607884-1-eizan@chromium.org> References: <20210709022324.1607884-1-eizan@chromium.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210708_192359_995387_4D83959E X-CRM114-Status: GOOD ( 25.35 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The original intent of commit 86698b9505bbc ("media: mtk-mdp: convert mtk_mdp_dev.comp array to list") was to create a list to track all the MDP components that needed to have their clocks enabled/disabled when calling mtk_mdp_comp_clock_on/off. However, there was a bug inside mtk_mdp_register_component where the args to a call to list_add were swapped. The result is that only one component was added to mtk_mdp_dev.comp_list because comp_list was instead being repeatedly added to the single element lists headed by each mtk_mdp_comp. The order of the args to list_add in mtk_mdp_register_component was fixed in https://patchwork.kernel.org/patch/11742895/ (Fix Null pointer dereference when calling list_add). Then, as a result of https://patchwork.kernel.org/patch/11530769/ (mtk-mdp: use pm_runtime in MDP component driver) if all the components are added to the component list, the mdp "master" / rdma0 component ends up having pm_runtime_get_sync() called on it twice recursively: rpm_resume+0x694/0x8f8 __pm_runtime_resume+0x7c/0xa0 ***NOTE*** mtk_mdp_comp_clock_on+0x48/0x104 [mtk_mdp] mtk_mdp_pm_resume+0x2c/0x44 [mtk_mdp] pm_generic_runtime_resume+0x34/0x48 __genpd_runtime_resume+0x6c/0x80 genpd_runtime_resume+0x104/0x1ac __rpm_callback+0x120/0x238 rpm_callback+0x34/0x8c rpm_resume+0x7a0/0x8f8 __pm_runtime_resume+0x7c/0xa0 ***NOTE*** mtk_mdp_m2m_start_streaming+0x2c/0x3c [mtk_mdp] (The calls to pm_runtime_get_sync are inlined and correspond to the calls to __pm_runtime_resume). It is not correct to have pm_runtime_get_sync called recursively and the second call will block indefinitely. As a result of all that, this change factors mtk_mdp_comp_clock_on/off into mtk_mdp_comp_power_on/off and moves the calls to pm_runtime_get/put into the power_on/off functions. This change then special-cases the master/rdma0 MDP component and does these things: - the master/rdma0 component is not added to mtk_mdp_dev.comp_list - the master/rdma0 component has its clocks (*but not power*) toggled by mtk_mpd_comp_clock_on/off inside mtk_mdp_clock_on/off. - the other components have their clocks *and* power toggled with mtk_mdp_comp_power_on/off. This change introduces the assumption that mtk_mdp_pm_resume will always be called though a callback from pm_runtime_get_sync made on the master / rdma0 component. Signed-off-by: Eizan Miyamoto --- (no changes since v1) drivers/media/platform/mtk-mdp/mtk_mdp_comp.c | 28 ++++++++++++++----- drivers/media/platform/mtk-mdp/mtk_mdp_comp.h | 3 ++ drivers/media/platform/mtk-mdp/mtk_mdp_core.c | 23 ++++++++++----- 3 files changed, 40 insertions(+), 14 deletions(-) diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c index 8b6158379f41..ce54863c24ce 100644 --- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.c @@ -53,9 +53,9 @@ static const struct of_device_id mtk_mdp_comp_driver_dt_match[] = { }; MODULE_DEVICE_TABLE(of, mtk_mdp_comp_driver_dt_match); -void mtk_mdp_comp_clock_on(struct mtk_mdp_comp *comp) +void mtk_mdp_comp_power_on(struct mtk_mdp_comp *comp) { - int i, err; + int err; if (comp->larb_dev) { err = mtk_smi_larb_get(comp->larb_dev); @@ -66,9 +66,25 @@ void mtk_mdp_comp_clock_on(struct mtk_mdp_comp *comp) err = pm_runtime_get_sync(comp->dev); if (err < 0) - dev_err(comp->dev, - "failed to runtime get, err %d.\n", - err); + dev_err(comp->dev, "failed to runtime get, err %d.\n", err); + + mtk_mdp_comp_clock_on(comp); +} + +void mtk_mdp_comp_power_off(struct mtk_mdp_comp *comp) +{ + int err; + + mtk_mdp_comp_clock_off(comp); + + err = pm_runtime_put_sync(comp->dev); + if (err < 0) + dev_err(comp->dev, "failed to runtime put, err %d.\n", err); +} + +void mtk_mdp_comp_clock_on(struct mtk_mdp_comp *comp) +{ + int i, err; for (i = 0; i < ARRAY_SIZE(comp->clk); i++) { if (IS_ERR(comp->clk[i])) @@ -91,8 +107,6 @@ void mtk_mdp_comp_clock_off(struct mtk_mdp_comp *comp) if (comp->larb_dev) mtk_smi_larb_put(comp->larb_dev); - - pm_runtime_put_sync(comp->dev); } static int mtk_mdp_comp_bind(struct device *dev, struct device *master, diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h index 5e2ee94a1b37..15ef9539a5a7 100644 --- a/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_comp.h @@ -23,6 +23,9 @@ struct mtk_mdp_comp { int mtk_mdp_comp_init(struct mtk_mdp_comp *comp, struct device *dev); +void mtk_mdp_comp_power_on(struct mtk_mdp_comp *comp); +void mtk_mdp_comp_power_off(struct mtk_mdp_comp *comp); + void mtk_mdp_comp_clock_on(struct mtk_mdp_comp *comp); void mtk_mdp_comp_clock_off(struct mtk_mdp_comp *comp); diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c index 78c40a61df1d..3558a6587f51 100644 --- a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c @@ -54,8 +54,15 @@ static void mtk_mdp_clock_on(struct mtk_mdp_dev *mdp) { struct mtk_mdp_comp *comp_node; + /* + * The master / rdma0 component will have pm_runtime_get_sync called + * on it through mtk_mdp_m2m_start_streaming, making it unnecessary to + * have mtk_mdp_comp_power_on called on it. + */ + mtk_mdp_comp_clock_on(&mdp->comp_self); + list_for_each_entry(comp_node, &mdp->comp_list, node) - mtk_mdp_comp_clock_on(comp_node); + mtk_mdp_comp_power_on(comp_node); } static void mtk_mdp_clock_off(struct mtk_mdp_dev *mdp) @@ -63,7 +70,14 @@ static void mtk_mdp_clock_off(struct mtk_mdp_dev *mdp) struct mtk_mdp_comp *comp_node; list_for_each_entry(comp_node, &mdp->comp_list, node) - mtk_mdp_comp_clock_off(comp_node); + mtk_mdp_comp_power_off(comp_node); + + /* + * The master / rdma0 component will have pm_runtime_put called + * on it through mtk_mdp_m2m_stop_streaming, making it unnecessary to + * have mtk_mdp_comp_power_off called on it. + */ + mtk_mdp_comp_clock_off(&mdp->comp_self); } static void mtk_mdp_wdt_worker(struct work_struct *work) @@ -102,8 +116,6 @@ static int mtk_mdp_master_bind(struct device *dev) int status; struct mtk_mdp_dev *mdp = dev_get_drvdata(dev); - mtk_mdp_register_component(mdp, &mdp->comp_self); - status = component_bind_all(dev, mdp); if (status) { dev_err(dev, "Failed to bind all components: %d\n", status); @@ -125,8 +137,6 @@ static int mtk_mdp_master_bind(struct device *dev) component_unbind_all(dev, mdp); err_component_bind_all: - mtk_mdp_unregister_component(mdp, &mdp->comp_self); - return status; } @@ -137,7 +147,6 @@ static void mtk_mdp_master_unbind(struct device *dev) pm_runtime_disable(dev); mtk_mdp_unregister_m2m_device(mdp); component_unbind_all(dev, mdp); - mtk_mdp_unregister_component(mdp, &mdp->comp_self); } static const struct component_master_ops mtk_mdp_com_ops = {