From patchwork Sun Sep 29 06:10:05 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chuan Liu via B4 Relay X-Patchwork-Id: 13814825 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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id E4E86CF6498 for ; Sun, 29 Sep 2024 06:13:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Reply-To:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:Cc:To:In-Reply-To: References:Message-Id:Content-Transfer-Encoding:Content-Type:MIME-Version: Subject:Date:From:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=R19RVXZzWLI0BboeJK/WZJpqUQLwXc7N6w77ZsNBV7s=; b=EHz04zH0cWmpZvKjHM5t4P77ck tVqmjVaMbqoW5WtEXqaxLcCVciFkjO54mQ9AB92HKIifURGe5BOiu3tx0aFFDEoMFpUlmSm1FSR6z mBt7ss+e1zk2tcdUFlZOoFG0SgpBhX5yMVbzyNRvtaU/ZZvTCS3Y0ZJd0n2PP9u4gjpqnQ/JjXu93 dO5qPxdljQ7A1zbLuxNCuI4puPMWadEgYsjJsIbhCINI3f7tz92R7OfW/LXn8ygPcGY9hXYRAx5ws iqIAzrNVy0F2qW/028ijZOodx4aWnHDd+2CB0q+yMLRhqZ3T8CPpFEKBmwf45238bgIqXMymXG0t7 XXKQrH1w==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1sunAv-0000000EG36-2IDj; Sun, 29 Sep 2024 06:12:57 +0000 Received: from dfw.source.kernel.org ([2604:1380:4641:c500::1]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1sun8Y-0000000EFPq-0nkv; Sun, 29 Sep 2024 06:10:32 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id 793A85C0FC3; Sun, 29 Sep 2024 06:10:24 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPS id D7BCFC4CECE; Sun, 29 Sep 2024 06:10:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1727590227; bh=7Fuox0/hODh+msXZV7oOranhdZQ4QHJP/cN1MxKp+98=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=YjM3FtzDabtKeBCpaRoyYb8f9EAXxa87YUUXVMu0J28eMjE6b7WunAaFPX5n/XZlI RtsXmQ+RxyHdVyTxXBczKq9K+FwfObVrJuqnWE6CcYsWRUMFLukEh0u9zD9xtqdq27 WSfBRokO/AkF1FBUbxbfaBWApVAI7pEKSer+hECXsvBCwvwnBQPLpMX271QZXYlG+Y w+esBgxFOuQNDOqGu+KNskrG/P/8KJ3YkVpSrWtWEriFG2VqsZ1CaU0yOJZHcoIHVB 9tnlc8nmqqn+759ZqIYfCqlfwB45xZv1pqx8QAvs93sShqD0cVb5VIEdes378sfwF1 mNLt16AvvpM2w== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id C1133CF6495; Sun, 29 Sep 2024 06:10:27 +0000 (UTC) From: Chuan Liu via B4 Relay Date: Sun, 29 Sep 2024 14:10:05 +0800 Subject: [PATCH 1/2] clk: Fix the CLK_IGNORE_UNUSED failure issue MIME-Version: 1.0 Message-Id: <20240929-fix_glitch_free-v1-1-22f9c36b7edf@amlogic.com> References: <20240929-fix_glitch_free-v1-0-22f9c36b7edf@amlogic.com> In-Reply-To: <20240929-fix_glitch_free-v1-0-22f9c36b7edf@amlogic.com> To: Michael Turquette , Stephen Boyd , Neil Armstrong , Jerome Brunet , Kevin Hilman , Martin Blumenstingl Cc: linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, linux-amlogic@lists.infradead.org, linux-arm-kernel@lists.infradead.org, Chuan Liu X-Mailer: b4 0.14.1 X-Developer-Signature: v=1; a=ed25519-sha256; t=1727590225; l=3496; i=chuan.liu@amlogic.com; s=20240902; h=from:subject:message-id; bh=j5nGks4RjMSPPYGFi+WoyylasN/sh7VgSzlGbwQyCJI=; b=QtvHpMbFuOIo/UK7CYtXIo11eZTGd+CWmoLcQrFkTWX/ZNF71z6QjhvRubudSx/KOMxNYM3TQ rCW5pbw2T0bCkhikgDPU6TxTQ7bPJUSAs/vbPKX2cfp1JR8FR89SO4f X-Developer-Key: i=chuan.liu@amlogic.com; a=ed25519; pk=fnKDB+81SoWGKW2GJNFkKy/ULvsDmJZRGBE7pR5Xcpo= X-Endpoint-Received: by B4 Relay for chuan.liu@amlogic.com/20240902 with auth_id=203 X-Original-From: Chuan Liu X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240928_231030_357684_58E8021B X-CRM114-Status: GOOD ( 16.28 ) 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: , Reply-To: chuan.liu@amlogic.com Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Chuan Liu When the clk_disable_unused_subtree() function disables an unused clock, if CLK_OPS_PARENT_ENABLE is configured on the clock, clk_core_prepare_enable() and clk_core_disable_unprepare() are called directly, and these two functions do not determine CLK_IGNORE_UNUSED, This causes the clock to be disabled even if CLK_IGNORE_UNUSED is configured when clk_core_disable_unprepare() is called. Two new functions clk_disable_unprepare_unused() and clk_prepare_enable_unused() are added to resolve the preceding situation. The CLK_IGNORE_UNUSED judgment logic is added to these two functions. To prevent clock configuration CLK_IGNORE_UNUSED from possible failure. Change-Id: I56943e17b86436254f07d9b8cdbc35599328d519 Signed-off-by: Chuan Liu --- drivers/clk/clk.c | 67 +++++++++++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 65 insertions(+), 2 deletions(-) diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index 285ed1ad8a37..5d3316699b57 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -94,6 +94,7 @@ struct clk_core { struct hlist_node debug_node; #endif struct kref ref; + bool ignore_enabled; }; #define CREATE_TRACE_POINTS @@ -1479,6 +1480,68 @@ static void __init clk_unprepare_unused_subtree(struct clk_core *core) } } +static void __init clk_disable_unprepare_unused(struct clk_core *core) +{ + unsigned long flags; + + lockdep_assert_held(&prepare_lock); + + if (!core) + return; + + if ((core->enable_count == 0) && core->ops->disable && + !core->ignore_enabled) { + flags = clk_enable_lock(); + core->ops->disable(core->hw); + clk_enable_unlock(flags); + } + + if ((core->prepare_count == 0) && core->ops->unprepare && + !core->ignore_enabled) + core->ops->unprepare(core->hw); + + core->ignore_enabled = false; + + clk_disable_unprepare_unused(core->parent); +} + +static int __init clk_prepare_enable_unused(struct clk_core *core) +{ + int ret = 0; + unsigned long flags; + + lockdep_assert_held(&prepare_lock); + + if (!core) + return 0; + + ret = clk_prepare_enable_unused(core->parent); + if (ret) + return ret; + + if ((core->flags & CLK_IGNORE_UNUSED) && clk_core_is_enabled(core)) + core->ignore_enabled = true; + + if ((core->prepare_count == 0) && core->ops->prepare) { + ret = core->ops->prepare(core->hw); + if (ret) + goto disable_unprepare; + } + + if ((core->enable_count == 0) && core->ops->enable) { + flags = clk_enable_lock(); + ret = core->ops->enable(core->hw); + clk_enable_unlock(flags); + if (ret) + goto disable_unprepare; + } + + return 0; +disable_unprepare: + clk_disable_unprepare_unused(core->parent); + return ret; +} + static void __init clk_disable_unused_subtree(struct clk_core *core) { struct clk_core *child; @@ -1490,7 +1553,7 @@ static void __init clk_disable_unused_subtree(struct clk_core *core) clk_disable_unused_subtree(child); if (core->flags & CLK_OPS_PARENT_ENABLE) - clk_core_prepare_enable(core->parent); + clk_prepare_enable_unused(core->parent); flags = clk_enable_lock(); @@ -1517,7 +1580,7 @@ static void __init clk_disable_unused_subtree(struct clk_core *core) unlock_out: clk_enable_unlock(flags); if (core->flags & CLK_OPS_PARENT_ENABLE) - clk_core_disable_unprepare(core->parent); + clk_disable_unprepare_unused(core->parent); } static bool clk_ignore_unused __initdata;