From patchwork Tue Apr 4 10:11:17 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxime Ripard X-Patchwork-Id: 13201252 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 alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) (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 C64E7C7619A for ; Wed, 5 Apr 2023 07:24:40 +0000 (UTC) Received: from alsa1.perex.cz (alsa1.perex.cz [207.180.221.201]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by alsa0.perex.cz (Postfix) with ESMTPS id B91EDDFA; Wed, 5 Apr 2023 09:23:48 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz B91EDDFA DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1680679478; bh=IwEgz161veiawiKdNuOBW5MAyJ+o8GT0uk16kXh+sLY=; h=From:Date:Subject:References:In-Reply-To:To:CC:List-Id: List-Archive:List-Help:List-Owner:List-Post:List-Subscribe: List-Unsubscribe:From; b=bRrFyqGKYSyLmkdIDIxWTbvV6OsvBqXo92fqoZeGaFFHpkUAMHn1Zjvnp0owqUOB7 qAUoOKMMl+KJFacc4CIMoe5xxQXJ5qmwvOjeghNo1KLXtW7RTFy4hMlfL0Fj3mhSUq cOsIKNwR01NRSmfSRY2yK39z+pQnyAMgICpITJ8Q= Received: from mailman-core.alsa-project.org (mailman-core.alsa-project.org [10.254.200.10]) by alsa1.perex.cz (Postfix) with ESMTP id 62D4BF805E5; Wed, 5 Apr 2023 09:18:17 +0200 (CEST) Received: by alsa1.perex.cz (Postfix, from userid 50401) id 4FF27F80423; Tue, 4 Apr 2023 14:44:56 +0200 (CEST) Received: from new3-smtp.messagingengine.com (new3-smtp.messagingengine.com [66.111.4.229]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits)) (No client certificate requested) by alsa1.perex.cz (Postfix) with ESMTPS id 91AE7F80054 for ; Tue, 4 Apr 2023 14:44:53 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz 91AE7F80054 Authentication-Results: alsa1.perex.cz; dkim=pass (2048-bit key, unprotected) header.d=cerno.tech header.i=@cerno.tech header.a=rsa-sha256 header.s=fm3 header.b=lcvpmJgz; dkim=pass (2048-bit key, unprotected) header.d=messagingengine.com header.i=@messagingengine.com header.a=rsa-sha256 header.s=fm2 header.b=ULLY0ymW Received: from compute4.internal (compute4.nyi.internal [10.202.2.44]) by mailnew.nyi.internal (Postfix) with ESMTP id 64E63582160; Tue, 4 Apr 2023 08:44:52 -0400 (EDT) Received: from mailfrontend2 ([10.202.2.163]) by compute4.internal (MEProxy); Tue, 04 Apr 2023 08:44:52 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cerno.tech; h=cc :cc:content-transfer-encoding:content-type:content-type: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= 1680612292; x=1680619492; bh=BmYoftJb7rcYHdtlBRpDNUU+CfimWUBZ5ua nFM3R0KU=; b=lcvpmJgzSe3SdrYcqJA9ONo9zmmjmwa8D67iy1CwpsY6R27s5PG BVojUkBLNUQPQnnpblgY4TSXb5FajeztQZXdhmCHSi5wBUMhnkPmvJIVL4O8vZ5z HyH7uwO1wvFB2Algi6sCIvZoIbZUzJzz3Mj5bc7dzwnnUKyM9LgxvebypaKwdFM6 TAkyzSYc14i9HIfGX7BPvUS79E507PSczO/QBs5VurIzfBOsbkabE0FDrP8QvnSj +RRgIhprjo87mqA0dOk5DeC4EHcxtBmeAtFE5zpfRVIEgiCbN0LtoPS1ohMtx+2W 0TlPXDckJexVbWMgFovo2o+JzQq2oxqRVGA== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:cc:content-transfer-encoding :content-type:content-type:date:date:feedback-id:feedback-id :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=fm2; t= 1680612292; x=1680619492; bh=BmYoftJb7rcYHdtlBRpDNUU+CfimWUBZ5ua nFM3R0KU=; b=ULLY0ymWpgutYoyyw2WXNX583urzAtJ82c8rgGXtuIwO/HZhL6k qebxr+cgtUReHQ2yq7IreLLVPO/vLPF/b8mYHI3UCNkORcZuY8wpkv0LBJER5VrP zUsWYWdd4qhrAhmf55CwIi4C084xs4HjLswkDDalsjiOeDNXB9nON0vUgQvVs3Di UBlwl/ZrbpBASgs02nhP5bg0Klt+PPdoYhOlauXOXt/shDXkEVlgdOXsAEgqJqMF te2Z+NQyudiH0OwBbxO+SdWucML9hCMwtomsP2VEbLNXIi8xxxt4EK+QsBq/O8Oh EED5g4QUnaVYv3GmEvsmwvb0iSqCzUuy2OQ== X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedvhedrvdeiledgheeiucetufdoteggodetrfdotf fvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdfqfgfvpdfurfetoffkrfgpnffqhgen uceurghilhhouhhtmecufedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmne cujfgurhephfffufggtgfgkfhfjgfvvefosehtjeertdertdejnecuhfhrohhmpeforgig ihhmvgcutfhiphgrrhguuceomhgrgihimhgvsegtvghrnhhordhtvggthheqnecuggftrf grthhtvghrnhepvedvleeijeegvdekffehkeehieelhfeggfffheetkeeuledvtdeuffeh teeltdffnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehmrghilhhfrhhomh epmhgrgihimhgvsegtvghrnhhordhtvggthh X-ME-Proxy: Feedback-ID: i8771445c:Fastmail Received: by mail.messagingengine.com (Postfix) with ESMTPA; Tue, 4 Apr 2023 08:44:50 -0400 (EDT) From: Maxime Ripard Date: Tue, 04 Apr 2023 12:11:17 +0200 Subject: [PATCH v3 27/65] clk: pxa: Add a determine_rate hook MIME-Version: 1.0 Message-Id: <20221018-clk-range-checks-fixes-v3-27-9a1358472d52@cerno.tech> References: <20221018-clk-range-checks-fixes-v3-0-9a1358472d52@cerno.tech> In-Reply-To: <20221018-clk-range-checks-fixes-v3-0-9a1358472d52@cerno.tech> To: Michael Turquette , Stephen Boyd , =?utf-8?q?Andreas_F=C3=A4rber?= , Manivannan Sadhasivam , Nicolas Ferre , Alexandre Belloni , Claudiu Beznea , Max Filippov , Charles Keepax , Richard Fitzgerald , Maxime Coquelin , Alexandre Torgue , Luca Ceresoli , David Lechner , Sekhar Nori , Abel Vesa , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , NXP Linux Team , Matthias Brugger , Geert Uytterhoeven , Dinh Nguyen , Peter De Schrijver , Prashant Gaikwad , Thierry Reding , Jonathan Hunter , Ulf Hansson , Linus Walleij , David Airlie , Daniel Vetter , Vinod Koul , Kishon Vijay Abraham I , Alessandro Zummo , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland , Liam Girdwood , Mark Brown , Jaroslav Kysela , Takashi Iwai , Paul Cercueil , Orson Zhai , Baolin Wang , Chunyan Zhang X-Mailer: b4 0.12.1 X-Developer-Signature: v=1; a=openpgp-sha256; l=2438; i=maxime@cerno.tech; h=from:subject:message-id; bh=IwEgz161veiawiKdNuOBW5MAyJ+o8GT0uk16kXh+sLY=; b=owGbwMvMwCX2+D1vfrpE4FHG02pJDCna37eaVXBZn76WUn0wnO3PxCDnc3+6GbV5xW6I2n8orG4M E+TvKGVhEONikBVTZIkRNl8Sd2rW6042vnkwc1iZQIYwcHEKwERWTWRkWPF3t9il9GUqUxQOzo8+6W 676ObPR8t3aa9Ourvs+8SlVz4z/M9SzxOVEAzdyxD7I2jTXMmbOfNm/joUO53Xd2vQqRX1CzgA X-Developer-Key: i=maxime@cerno.tech; a=openpgp; fpr=BE5675C37E818C8B5764241C254BCFC56BF6CE8D X-MailFrom: maxime@cerno.tech X-Mailman-Rule-Hits: max-recipients X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-alsa-devel.alsa-project.org-0; header-match-alsa-devel.alsa-project.org-1; nonmember-moderation; administrivia; implicit-dest; max-size; news-moderation; no-subject; digests; suspicious-header Message-ID-Hash: DZA5GX7WS4J3ABHLACJGKBJGJB6KQ4QD X-Message-ID-Hash: DZA5GX7WS4J3ABHLACJGKBJGJB6KQ4QD X-Mailman-Approved-At: Wed, 05 Apr 2023 07:18:11 +0000 CC: linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, AngeloGioacchino Del Regno , linux-arm-kernel@lists.infradead.org, linux-actions@lists.infradead.org, patches@opensource.cirrus.com, linux-stm32@st-md-mailman.stormreply.com, linux-mediatek@lists.infradead.org, linux-renesas-soc@vger.kernel.org, linux-tegra@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-phy@lists.infradead.org, linux-rtc@vger.kernel.org, linux-sunxi@lists.linux.dev, alsa-devel@alsa-project.org, linux-mips@vger.kernel.org, Maxime Ripard X-Mailman-Version: 3.3.8 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: The PXA "CKEN" clock implements a mux with a set_parent hook, but doesn't provide a determine_rate implementation. This is a bit odd, since set_parent() is there to, as its name implies, change the parent of a clock. However, the most likely candidate to trigger that parent change is a call to clk_set_rate(), with determine_rate() figuring out which parent is the best suited for a given rate. The other trigger would be a call to clk_set_parent(), but it's far less used, and it doesn't look like there's any obvious user for that clock. So, the set_parent hook is effectively unused, possibly because of an oversight. However, it could also be an explicit decision by the original author to avoid any reparenting but through an explicit call to clk_set_parent(). The latter case would be equivalent to setting the flag CLK_SET_RATE_NO_REPARENT, together with setting our determine_rate hook to __clk_mux_determine_rate(). Indeed, if no determine_rate implementation is provided, clk_round_rate() (through clk_core_round_rate_nolock()) will call itself on the parent if CLK_SET_RATE_PARENT is set, and will not change the clock rate otherwise. __clk_mux_determine_rate() has the exact same behavior when CLK_SET_RATE_NO_REPARENT is set. And if it was an oversight, then we are at least explicit about our behavior now and it can be further refined down the line. Since the set_parent implementation is a nop though, it seems unlikely. Signed-off-by: Maxime Ripard --- drivers/clk/pxa/clk-pxa.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/clk/pxa/clk-pxa.c b/drivers/clk/pxa/clk-pxa.c index 374098ebbf2b..47bc60c2854c 100644 --- a/drivers/clk/pxa/clk-pxa.c +++ b/drivers/clk/pxa/clk-pxa.c @@ -82,6 +82,7 @@ static u8 cken_get_parent(struct clk_hw *hw) } static const struct clk_ops cken_mux_ops = { + .determine_rate = __clk_mux_determine_rate, .get_parent = cken_get_parent, .set_parent = dummy_clk_set_parent, }; @@ -117,7 +118,7 @@ int __init clk_pxa_cken_init(const struct desc_clk_cken *clks, &pxa_clk->hw, &cken_mux_ops, &pxa_clk->hw, &cken_rate_ops, &pxa_clk->gate.hw, &clk_gate_ops, - clks[i].flags); + clks[i].flags | CLK_SET_RATE_NO_REPARENT); clkdev_pxa_register(clks[i].ckid, clks[i].con_id, clks[i].dev_id, clk); }