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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7FA59C433EF for ; Wed, 11 May 2022 14:43:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244917AbiEKOnC (ORCPT ); Wed, 11 May 2022 10:43:02 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33516 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244912AbiEKOnB (ORCPT ); Wed, 11 May 2022 10:43:01 -0400 Received: from wout4-smtp.messagingengine.com (wout4-smtp.messagingengine.com [64.147.123.20]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1C92365417 for ; Wed, 11 May 2022 07:43:00 -0700 (PDT) Received: from compute3.internal (compute3.nyi.internal [10.202.2.43]) by mailout.west.internal (Postfix) with ESMTP id EB94F3200982; Wed, 11 May 2022 10:42:57 -0400 (EDT) Received: from mailfrontend1 ([10.202.2.162]) by compute3.internal (MEProxy); Wed, 11 May 2022 10:42:59 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cerno.tech; h=cc :cc:content-transfer-encoding:date:date:from:from:in-reply-to :in-reply-to:message-id:mime-version:references:reply-to:sender :subject:subject:to:to; s=fm3; t=1652280177; x=1652366577; bh=xV QGV5aF6muznsh+wrXRc0KoGcw8HugWErZ/xX9uw8U=; b=OtTAPesEAhVBAqpqF7 DfjA+hd8sWoxwIqeb2vI8UfQPIvf/YCR9eu9qhhYSetQcfrK1yi1Y+JNORL4VHuM /XvAalwzthgF5VIhSdI16/vp8p/Ci++xQy7ZlAGVY8pDuRDICLXgD5cz5dqtqiAb ozaLJ+m/Kr2YE6inTn8NJIUYUYTb1XeCICKIVLFvkVtynhWg3izplAuMOSo0FiTQ mBvMNaVSgxGBg/lxke4FJb6JtOEx242Vgn4Nb9HTfl9T6wn99C51Ouypn584YUb5 T+yQZgVDIujnao3AKE6LYnaho7/cX1Ke1Y7FOuuy/Q96xvIqGKGFg7gzSFlfnPhL lPmw== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:cc:content-transfer-encoding:date:date :from:from:in-reply-to:in-reply-to:message-id:mime-version :references:reply-to:sender:subject:subject:to:to:x-me-proxy :x-me-proxy:x-me-sender:x-me-sender:x-sasl-enc; s=fm1; t= 1652280177; x=1652366577; bh=xVQGV5aF6muznsh+wrXRc0KoGcw8HugWErZ /xX9uw8U=; b=FfoVgiC4luiKqHq3cFWBNixe7r4d9ZYKgfzwYwa54zNHTHaP1QZ +MjlApS00cSh/H9Cdk1x3bUh7rYvQ4oC9BPp7Xpimn9bH9pWDdAsa3DEEHzRVgOw s16jg0ivaXbE1jp8ElJWSaNRAEPjtP57dvvFcgJHa3L/xw3H8mpCfzK6CmqJ40y+ i7vcjofkGi+qUrB9oX3ATsDGhWgwbpO695mcBEEECU/S50z/G1/WRIpORZICS4sk BCl7EVPAfOtjNqrEC9IsMuHUh6Pk8is/q/uLoYW/FeEu9JGfS1LUEYB+xnZ/AWG2 ycAq7hiKXgV9abzUdwLdFaZ+/UKkrwXUihg== X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedvfedrgeehgdejjecutefuodetggdotefrodftvf curfhrohhfihhlvgemucfhrghsthforghilhdpqfgfvfdpuffrtefokffrpgfnqfghnecu uegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenuc fjughrpefhvfevufffkffojghfggfgsedtkeertdertddtnecuhfhrohhmpeforgigihhm vgcutfhiphgrrhguuceomhgrgihimhgvsegtvghrnhhordhtvggthheqnecuggftrfgrth htvghrnhepleekfeetudfhkeejiefhtedugfeuvdevkeekteetkefhkefhtdelgfefuddv jefhnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehmrghilhhfrhhomhepmh grgihimhgvsegtvghrnhhordhtvggthh X-ME-Proxy: Received: by mail.messagingengine.com (Postfix) with ESMTPA; Wed, 11 May 2022 10:42:55 -0400 (EDT) From: Maxime Ripard To: Mike Turquette , Stephen Boyd , linux-clk@vger.kernel.org Cc: Jerome Brunet , Alexander Stein , Naresh Kamboju , Yassine Oudjana , Marek Szyprowski , Neil Armstrong , Dmitry Baryshkov , Tony Lindgren , Maxime Ripard Subject: [PATCH v3 01/28] clk: Drop the rate range on clk_put() Date: Wed, 11 May 2022 16:42:22 +0200 Message-Id: <20220511144249.354775-2-maxime@cerno.tech> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220511144249.354775-1-maxime@cerno.tech> References: <20220511144249.354775-1-maxime@cerno.tech> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-clk@vger.kernel.org When clk_put() is called we don't make another clk_set_rate() call to re-evaluate the rate boundaries. This is unlike clk_set_rate_range() that evaluates the rate again each time it is called. However, clk_put() is essentially equivalent to clk_set_rate_range() since after clk_put() completes the consumer's boundaries shouldn't be enforced anymore. Let's add a call to clk_set_rate_range() in clk_put() to make sure those rate boundaries are dropped and the clock provider drivers can react. In order to be as non-intrusive as possible, we'll just make that call if the clock had non-default boundaries. Also add a few tests to make sure this case is covered. Fixes: c80ac50cbb37 ("clk: Always set the rate on clk_set_range_rate") Tested-by: Alexander Stein # imx8mp Tested-by: Marek Szyprowski # exynos4210, meson g12b Signed-off-by: Maxime Ripard --- drivers/clk/clk.c | 45 +++++++++++------ drivers/clk/clk_test.c | 108 +++++++++++++++++++++++++++++++++++++++++ 2 files changed, 139 insertions(+), 14 deletions(-) diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index f00d4c1158d7..2a32fa9f7618 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -2325,19 +2325,15 @@ int clk_set_rate_exclusive(struct clk *clk, unsigned long rate) } EXPORT_SYMBOL_GPL(clk_set_rate_exclusive); -/** - * clk_set_rate_range - set a rate range for a clock source - * @clk: clock source - * @min: desired minimum clock rate in Hz, inclusive - * @max: desired maximum clock rate in Hz, inclusive - * - * Returns success (0) or negative errno. - */ -int clk_set_rate_range(struct clk *clk, unsigned long min, unsigned long max) +static int clk_set_rate_range_nolock(struct clk *clk, + unsigned long min, + unsigned long max) { int ret = 0; unsigned long old_min, old_max, rate; + lockdep_assert_held(&prepare_lock); + if (!clk) return 0; @@ -2350,8 +2346,6 @@ int clk_set_rate_range(struct clk *clk, unsigned long min, unsigned long max) return -EINVAL; } - clk_prepare_lock(); - if (clk->exclusive_count) clk_core_rate_unprotect(clk->core); @@ -2395,6 +2389,28 @@ int clk_set_rate_range(struct clk *clk, unsigned long min, unsigned long max) if (clk->exclusive_count) clk_core_rate_protect(clk->core); + return ret; +} + +/** + * clk_set_rate_range - set a rate range for a clock source + * @clk: clock source + * @min: desired minimum clock rate in Hz, inclusive + * @max: desired maximum clock rate in Hz, inclusive + * + * Return: 0 for success or negative errno on failure. + */ +int clk_set_rate_range(struct clk *clk, unsigned long min, unsigned long max) +{ + int ret; + + if (!clk) + return 0; + + clk_prepare_lock(); + + ret = clk_set_rate_range_nolock(clk, min, max); + clk_prepare_unlock(); return ret; @@ -4396,9 +4412,10 @@ void __clk_put(struct clk *clk) } hlist_del(&clk->clks_node); - if (clk->min_rate > clk->core->req_rate || - clk->max_rate < clk->core->req_rate) - clk_core_set_rate_nolock(clk->core, clk->core->req_rate); + + /* If we had any boundaries on that clock, let's drop them. */ + if (clk->min_rate > 0 || clk->max_rate < ULONG_MAX) + clk_set_rate_range_nolock(clk, 0, ULONG_MAX); owner = clk->core->owner; kref_put(&clk->core->ref, __clk_release); diff --git a/drivers/clk/clk_test.c b/drivers/clk/clk_test.c index 6731a822f4e3..fd2339cc5898 100644 --- a/drivers/clk/clk_test.c +++ b/drivers/clk/clk_test.c @@ -760,9 +760,65 @@ static void clk_range_test_multiple_set_range_rate_maximized(struct kunit *test) clk_put(user1); } +/* + * Test that if we have several subsequent calls to + * clk_set_rate_range(), across multiple users, the core will reevaluate + * whether a new rate is needed, including when a user drop its clock. + * + * With clk_dummy_maximize_rate_ops, this means that the rate will + * trail along the maximum as it evolves. + */ +static void clk_range_test_multiple_set_range_rate_put_maximized(struct kunit *test) +{ + struct clk_dummy_context *ctx = test->priv; + struct clk_hw *hw = &ctx->hw; + struct clk *clk = hw->clk; + struct clk *user1, *user2; + unsigned long rate; + + user1 = clk_hw_get_clk(hw, NULL); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, user1); + + user2 = clk_hw_get_clk(hw, NULL); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, user2); + + KUNIT_ASSERT_EQ(test, + clk_set_rate(clk, DUMMY_CLOCK_RATE_2 + 1000), + 0); + + KUNIT_ASSERT_EQ(test, + clk_set_rate_range(user1, + 0, + DUMMY_CLOCK_RATE_2), + 0); + + rate = clk_get_rate(clk); + KUNIT_ASSERT_GT(test, rate, 0); + KUNIT_EXPECT_EQ(test, rate, DUMMY_CLOCK_RATE_2); + + KUNIT_ASSERT_EQ(test, + clk_set_rate_range(user2, + 0, + DUMMY_CLOCK_RATE_1), + 0); + + rate = clk_get_rate(clk); + KUNIT_ASSERT_GT(test, rate, 0); + KUNIT_EXPECT_EQ(test, rate, DUMMY_CLOCK_RATE_1); + + clk_put(user2); + + rate = clk_get_rate(clk); + KUNIT_ASSERT_GT(test, rate, 0); + KUNIT_EXPECT_EQ(test, rate, DUMMY_CLOCK_RATE_2); + + clk_put(user1); +} + static struct kunit_case clk_range_maximize_test_cases[] = { KUNIT_CASE(clk_range_test_set_range_rate_maximized), KUNIT_CASE(clk_range_test_multiple_set_range_rate_maximized), + KUNIT_CASE(clk_range_test_multiple_set_range_rate_put_maximized), {} }; @@ -877,9 +933,61 @@ static void clk_range_test_multiple_set_range_rate_minimized(struct kunit *test) clk_put(user1); } +/* + * Test that if we have several subsequent calls to + * clk_set_rate_range(), across multiple users, the core will reevaluate + * whether a new rate is needed, including when a user drop its clock. + * + * With clk_dummy_minimize_rate_ops, this means that the rate will + * trail along the minimum as it evolves. + */ +static void clk_range_test_multiple_set_range_rate_put_minimized(struct kunit *test) +{ + struct clk_dummy_context *ctx = test->priv; + struct clk_hw *hw = &ctx->hw; + struct clk *clk = hw->clk; + struct clk *user1, *user2; + unsigned long rate; + + user1 = clk_hw_get_clk(hw, NULL); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, user1); + + user2 = clk_hw_get_clk(hw, NULL); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, user2); + + KUNIT_ASSERT_EQ(test, + clk_set_rate_range(user1, + DUMMY_CLOCK_RATE_1, + ULONG_MAX), + 0); + + rate = clk_get_rate(clk); + KUNIT_ASSERT_GT(test, rate, 0); + KUNIT_EXPECT_EQ(test, rate, DUMMY_CLOCK_RATE_1); + + KUNIT_ASSERT_EQ(test, + clk_set_rate_range(user2, + DUMMY_CLOCK_RATE_2, + ULONG_MAX), + 0); + + rate = clk_get_rate(clk); + KUNIT_ASSERT_GT(test, rate, 0); + KUNIT_EXPECT_EQ(test, rate, DUMMY_CLOCK_RATE_2); + + clk_put(user2); + + rate = clk_get_rate(clk); + KUNIT_ASSERT_GT(test, rate, 0); + KUNIT_EXPECT_EQ(test, rate, DUMMY_CLOCK_RATE_1); + + clk_put(user1); +} + static struct kunit_case clk_range_minimize_test_cases[] = { KUNIT_CASE(clk_range_test_set_range_rate_minimized), KUNIT_CASE(clk_range_test_multiple_set_range_rate_minimized), + KUNIT_CASE(clk_range_test_multiple_set_range_rate_put_minimized), {} }; -- 2.36.1