From patchwork Tue Apr 4 10:10:56 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxime Ripard X-Patchwork-Id: 13199504 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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (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 925DDC761AF for ; Tue, 4 Apr 2023 10:22:21 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 024F310E649; Tue, 4 Apr 2023 10:22:19 +0000 (UTC) Received: from new4-smtp.messagingengine.com (new4-smtp.messagingengine.com [66.111.4.230]) by gabe.freedesktop.org (Postfix) with ESMTPS id C9F6910E648 for ; Tue, 4 Apr 2023 10:22:17 +0000 (UTC) Received: from compute2.internal (compute2.nyi.internal [10.202.2.46]) by mailnew.nyi.internal (Postfix) with ESMTP id 26F6C58214E; Tue, 4 Apr 2023 06:22:17 -0400 (EDT) Received: from mailfrontend1 ([10.202.2.162]) by compute2.internal (MEProxy); Tue, 04 Apr 2023 06:22:17 -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= 1680603737; x=1680610937; bh=j/4Jzg911PH5jjxhbLAbKUQE+Sv3FHKLbVL okffvEoA=; b=JkGpuXf5kOkD5AZj3GN9zcq9qsUW/llAg/PnM7dHH3l5pfUg1PV 6xQZ0B0vMIaC6oegv+70SZQ8GCCI5s9dzX1cPV9r111C/p0WmO57qXgDtO1Z9Jew oFjh2aju3fphjyBUAbAs52RzGD+eq6OuuuZpDVsfq2h5QNaG9BJP5VpVh+ZMhVWG fvw+5G2H8QCE0ZibuFRAEUAFlIV1vw99DKYxBU0/A453CrxpN8cMCqeHYepU08Vc PrpPwd9Bp79xtfFI69WWwkuVzSpgaDbe588oRNPewdNIkBGJDzqKXO4EM6i+GGvA fCMsfpNwVAqBWmxM8XLbXODtWO4QM5Mo8KA== 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= 1680603737; x=1680610937; bh=j/4Jzg911PH5jjxhbLAbKUQE+Sv3FHKLbVL okffvEoA=; b=L5zzTAdnvcc7gnqyFiT3Ud/dmeVcukmC9ToDqgj48qoFTyPyKGJ gQWdsRZ6i54p9N1Ug1j9LZELUe+WveA+qe8omV01XOGRj93g8s5kS7MEZ+S8/IQi OQE9m/zttQyD+wtYj75SVdS+R+Dd3hT/2LpgsBCU0u1fWfj7Fj2xphBZ8Ifd/x7+ RwgvAOUeMVPb6ktI6cnecle5RJygSFn8SBkrlh56j+KfKhpKYTnHioXKlzfppUuR CiYz9kLnn/tJn1+EgzDPDzBteg2nVvMJELXTzGOCd6vJL6DwSGO3/DgKd6WoERUV w00mYL0delGhwlv7LIlsFmk7atzI9S2xFrg== X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedvhedrvdeiledgvdejucetufdoteggodetrfdotf fvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdfqfgfvpdfurfetoffkrfgpnffqhgen uceurghilhhouhhtmecufedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmne cujfgurhephfffufggtgfgkfhfjgfvvefosehtjeertdertdejnecuhfhrohhmpeforgig ihhmvgcutfhiphgrrhguuceomhgrgihimhgvsegtvghrnhhordhtvggthheqnecuggftrf grthhtvghrnhepvedvleeijeegvdekffehkeehieelhfeggfffheetkeeuledvtdeuffeh teeltdffnecuvehluhhsthgvrhfuihiivgepudenucfrrghrrghmpehmrghilhhfrhhomh epmhgrgihimhgvsegtvghrnhhordhtvggthh X-ME-Proxy: Feedback-ID: i8771445c:Fastmail Received: by mail.messagingengine.com (Postfix) with ESMTPA; Tue, 4 Apr 2023 06:22:15 -0400 (EDT) From: Maxime Ripard Date: Tue, 04 Apr 2023 12:10:56 +0200 Subject: [PATCH v3 06/65] clk: at91: main: Add a determine_rate hook MIME-Version: 1.0 Message-Id: <20221018-clk-range-checks-fixes-v3-6-9a1358472d52@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=2472; i=maxime@cerno.tech; h=from:subject:message-id; bh=Xh8bEjy8TDiL4VFAVsU/ZEQPgP24I3rJw/jGgVS+vnY=; b=owGbwMvMwCX2+D1vfrpE4FHG02pJDCna37ccSOrqmRR2/YP9jbxwtrj6tUvioqtXTXG8buIjNfWF n/CejlIWBjEuBlkxRZYYYfMlcadmve5k45sHM4eVCWQIAxenAEwkqZHhn/qdxIy2n/f/N1kVLg3ax3 qy+9f9ky7TvitvmtsubB7SIcTIcE722J5XShPLr/HoeFiHfGy/F6Rju1woqu34+dcVJ7908QEA X-Developer-Key: i=maxime@cerno.tech; a=openpgp; fpr=BE5675C37E818C8B5764241C254BCFC56BF6CE8D X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-rtc@vger.kernel.org, alsa-devel@alsa-project.org, patches@opensource.cirrus.com, linux-actions@lists.infradead.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-stm32@st-md-mailman.stormreply.com, linux-renesas-soc@vger.kernel.org, linux-phy@lists.infradead.org, linux-mediatek@lists.infradead.org, Maxime Ripard , linux-tegra@vger.kernel.org, linux-mips@vger.kernel.org, linux-sunxi@lists.linux.dev, linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org, AngeloGioacchino Del Regno Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" The SAM9x5 main 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. Signed-off-by: Maxime Ripard Reviewed-by: Claudiu Beznea Tested-by: Claudiu Beznea --- drivers/clk/at91/clk-main.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/clk/at91/clk-main.c b/drivers/clk/at91/clk-main.c index 8601b27c1ae0..e04e72394632 100644 --- a/drivers/clk/at91/clk-main.c +++ b/drivers/clk/at91/clk-main.c @@ -533,6 +533,7 @@ static const struct clk_ops sam9x5_main_ops = { .prepare = clk_sam9x5_main_prepare, .is_prepared = clk_sam9x5_main_is_prepared, .recalc_rate = clk_sam9x5_main_recalc_rate, + .determine_rate = __clk_mux_determine_rate, .set_parent = clk_sam9x5_main_set_parent, .get_parent = clk_sam9x5_main_get_parent, .save_context = clk_sam9x5_main_save_context, @@ -565,7 +566,7 @@ at91_clk_register_sam9x5_main(struct regmap *regmap, init.ops = &sam9x5_main_ops; init.parent_names = parent_names; init.num_parents = num_parents; - init.flags = CLK_SET_PARENT_GATE; + init.flags = CLK_SET_PARENT_GATE | CLK_SET_RATE_NO_REPARENT; clkmain->hw.init = &init; clkmain->regmap = regmap;