From patchwork Sun Dec 25 16:47:04 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Abel Vesa X-Patchwork-Id: 13081505 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 E5956C46467 for ; Sun, 25 Dec 2022 16:47:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231302AbiLYQrT (ORCPT ); Sun, 25 Dec 2022 11:47:19 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37074 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229942AbiLYQrP (ORCPT ); Sun, 25 Dec 2022 11:47:15 -0500 Received: from mail-wm1-x334.google.com (mail-wm1-x334.google.com [IPv6:2a00:1450:4864:20::334]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 14D9510E3 for ; Sun, 25 Dec 2022 08:47:12 -0800 (PST) Received: by mail-wm1-x334.google.com with SMTP id bg10so6519431wmb.1 for ; Sun, 25 Dec 2022 08:47:12 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=bJSRHwGgSQsIgnd1ziT5DVB7secN8//21s4cglbkjsI=; b=OwYNmML6Qi1WxRgnDi95+Q6UGEOFHsX0RzzURE1yyZ1VPvRebZxXn1yOAMERCq23cV Qvd/8FPjAtm5qkvNlgpzPewQSsUVbBQYiiKu9/bBmYUYYjFPPhGXwciXRqpTaCXppOjg P0ekRQWHncfmm+WVyTA8fOU4LanckORvwC57AbsBjkC0h5vq7XeULjmx5csbCPZlrBF8 RDjFVz9H4k66mru2ZWUXlNE52wuRuyviaI6vEVaswdhV2TZQhoJZFuRlsWbEur+M/K2a WEaLlP/wmsHd3mje0gHE9Zb7lN2L/zh7ZgC730yudztHp0zR/EwQKJp+ZimIFXvA+RpX FDUA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=bJSRHwGgSQsIgnd1ziT5DVB7secN8//21s4cglbkjsI=; b=OJG09pLXoGeZ95GwFz7leqKf02JVs1j56gB7r+2V4YzUrdwAp3eGlSN06HUK1c2SVJ Ay7hY7CH8sAz9ljCrPX2jpZXX9KWnVjdIcgSTDq4Vv6l0D4Q0oUyeV9thxWhaLzg9Wuq zWKUcLuDiZJsANMao/H22XN8oS+tepwvXpdBDdDKBdYdzMubkg75/+4q7ZxmCA/9K+o6 Na+x1wCNDCrwvio3Df5/O9My8I6InxXcXNQTb7FL5jTRG7K0oH67C5jCPQsdLMp/ByeR bLgk+u0xveNZYkEYfldCc0H3cFLXHt2/r3wPtTYEnUExcPA6B3T6Q1zLVCOUDhB7t2SI rmBA== X-Gm-Message-State: AFqh2koe9eRLjg1Xvuv+IIqmxEpd5RtmasCRmcUjk0sM7/9P6hfPx02Z e78peW7f4MeXL7eOh8UPZBE69w== X-Google-Smtp-Source: AMrXdXtVexBf8lzbMFmlaHdKrIcnaqWySkpsYWR2qMQfpHVq1jFB4O1fHaaAyCXzTghTiDuaAdJpVw== X-Received: by 2002:a05:600c:21c1:b0:3d3:45c6:b641 with SMTP id x1-20020a05600c21c100b003d345c6b641mr11547895wmj.22.1671986830532; Sun, 25 Dec 2022 08:47:10 -0800 (PST) Received: from hackbox.lan ([94.52.112.99]) by smtp.gmail.com with ESMTPSA id d9-20020a05600c3ac900b003d973d4fb28sm5507545wms.4.2022.12.25.08.47.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 25 Dec 2022 08:47:10 -0800 (PST) From: Abel Vesa To: Mike Turquette , Stephen Boyd , Andy Gross , Bjorn Andersson , Konrad Dybcio Cc: linux-clk@vger.kernel.org, Linux Kernel Mailing List , linux-arm-msm@vger.kernel.org Subject: [PATCH v2 1/2] clk: Add generic sync_state callback for disabling unused clocks Date: Sun, 25 Dec 2022 18:47:04 +0200 Message-Id: <20221225164705.437944-1-abel.vesa@linaro.org> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org There are unused clocks that need to remain untouched by clk_disable_unused, and most likely could be disabled later on sync_state. So provide a generic sync_state callback for the clock providers that register such clocks. Then, use the same mechanism as clk_disable_unused from that generic callback, but pass the device to make sure only the clocks belonging to the current clock provider get disabled, if unused. Also, during the default clk_disable_unused, if the driver that registered the clock has the generic clk_sync_state_disable_unused callback set for sync_state, skip disabling its clocks. Signed-off-by: Abel Vesa --- Changes since v1: * Dropped the 0 returned by __clk_disable_unused when clk_ignore_unused is set. * Dropped __initdata for clk_ignore_unused drivers/clk/clk.c | 59 +++++++++++++++++++++++++++++------- include/linux/clk-provider.h | 1 + 2 files changed, 49 insertions(+), 11 deletions(-) diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index e62552a75f08..5185b857fc65 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -1302,14 +1302,27 @@ static void clk_core_disable_unprepare(struct clk_core *core) clk_core_unprepare_lock(core); } -static void __init clk_unprepare_unused_subtree(struct clk_core *core) +static void clk_unprepare_unused_subtree(struct clk_core *core, + struct device *dev) { + bool from_sync_state = !!dev; struct clk_core *child; lockdep_assert_held(&prepare_lock); hlist_for_each_entry(child, &core->children, child_node) - clk_unprepare_unused_subtree(child); + clk_unprepare_unused_subtree(child, dev); + + if (from_sync_state && core->dev != dev) + return; + + /* + * clock will be unprepared on sync_state, + * so leave as is for now + */ + if (!from_sync_state && dev_has_sync_state(core->dev) && + core->dev->driver->sync_state == clk_sync_state_disable_unused) + return; if (core->prepare_count) return; @@ -1332,15 +1345,28 @@ static void __init clk_unprepare_unused_subtree(struct clk_core *core) clk_pm_runtime_put(core); } -static void __init clk_disable_unused_subtree(struct clk_core *core) +static void clk_disable_unused_subtree(struct clk_core *core, + struct device *dev) { + bool from_sync_state = !!dev; struct clk_core *child; unsigned long flags; lockdep_assert_held(&prepare_lock); hlist_for_each_entry(child, &core->children, child_node) - clk_disable_unused_subtree(child); + clk_disable_unused_subtree(child, dev); + + if (from_sync_state && core->dev != dev) + return; + + /* + * clock will be disabled on sync_state, + * so leave as is for now + */ + if (!from_sync_state && + core->dev->driver->sync_state == clk_sync_state_disable_unused) + return; if (core->flags & CLK_OPS_PARENT_ENABLE) clk_core_prepare_enable(core->parent); @@ -1378,7 +1404,7 @@ static void __init clk_disable_unused_subtree(struct clk_core *core) clk_core_disable_unprepare(core->parent); } -static bool clk_ignore_unused __initdata; +static bool clk_ignore_unused; static int __init clk_ignore_unused_setup(char *__unused) { clk_ignore_unused = true; @@ -1386,35 +1412,46 @@ static int __init clk_ignore_unused_setup(char *__unused) } __setup("clk_ignore_unused", clk_ignore_unused_setup); -static int __init clk_disable_unused(void) +static void __clk_disable_unused(struct device *dev) { struct clk_core *core; if (clk_ignore_unused) { pr_warn("clk: Not disabling unused clocks\n"); - return 0; + return; } clk_prepare_lock(); hlist_for_each_entry(core, &clk_root_list, child_node) - clk_disable_unused_subtree(core); + clk_disable_unused_subtree(core, dev); hlist_for_each_entry(core, &clk_orphan_list, child_node) - clk_disable_unused_subtree(core); + clk_disable_unused_subtree(core, dev); hlist_for_each_entry(core, &clk_root_list, child_node) - clk_unprepare_unused_subtree(core); + clk_unprepare_unused_subtree(core, dev); hlist_for_each_entry(core, &clk_orphan_list, child_node) - clk_unprepare_unused_subtree(core); + clk_unprepare_unused_subtree(core, dev); clk_prepare_unlock(); +} + +static int __init clk_disable_unused(void) +{ + __clk_disable_unused(NULL); return 0; } late_initcall_sync(clk_disable_unused); +void clk_sync_state_disable_unused(struct device *dev) +{ + __clk_disable_unused(dev); +} +EXPORT_SYMBOL_GPL(clk_sync_state_disable_unused); + static int clk_core_determine_round_nolock(struct clk_core *core, struct clk_rate_request *req) { diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h index 842e72a5348f..cf1adfeaf257 100644 --- a/include/linux/clk-provider.h +++ b/include/linux/clk-provider.h @@ -720,6 +720,7 @@ struct clk *clk_register_divider_table(struct device *dev, const char *name, void __iomem *reg, u8 shift, u8 width, u8 clk_divider_flags, const struct clk_div_table *table, spinlock_t *lock); +void clk_sync_state_disable_unused(struct device *dev); /** * clk_register_divider - register a divider clock with the clock framework * @dev: device registering this clock