From patchwork Thu Nov 21 17:41:12 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Miquel Raynal X-Patchwork-Id: 13882223 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 285A7D743C9 for ; Thu, 21 Nov 2024 17:41:44 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id DAF4A10EA13; Thu, 21 Nov 2024 17:41:42 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=bootlin.com header.i=@bootlin.com header.b="RWoZGU5f"; dkim-atps=neutral Received: from relay7-d.mail.gandi.net (relay7-d.mail.gandi.net [217.70.183.200]) by gabe.freedesktop.org (Postfix) with ESMTPS id 277F110EA08 for ; Thu, 21 Nov 2024 17:41:40 +0000 (UTC) Received: by mail.gandi.net (Postfix) with ESMTPSA id D004620010; Thu, 21 Nov 2024 17:41:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1732210898; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=ZKTy8XWO2qgziAQ1aV4BgRlmD2JBLSeCDp8Nwyzn3qA=; b=RWoZGU5fJqpTbXKi5tH+r+d1vmD3mjfhf6zksxyRpNa2uNYJqMxwWp/aivD8zuRYvbeVR6 HaBQw6HXteslHcYc5HeiakgI80i3lGL4NvA0dVR49fCXFMkNaqK2+x1vIMmPZyaCPYDUea EiEcuu2XP80YdISzxDRiKnFalLoPHLRrs+BPSDuUxPflkp3mdDL0rueP/9UY9TKAsH6hhh T3NGDcPuhqZ9mQTaTLd35fNleQXRbFnRYg12+0mlyMKpkFqtd7yXICaPQg7eEkmXvMJj/b 7qTCJNRPyQTqux8xlrxIUqgH9YKhnerMsJ+IDdSQuq/HEUrdwwCHfsYqkgdD3Q== From: Miquel Raynal Date: Thu, 21 Nov 2024 18:41:12 +0100 Subject: [PATCH 2/5] clk: Add a helper to determine a clock rate MIME-Version: 1.0 Message-Id: <20241121-ge-ian-debug-imx8-clk-tree-v1-2-0f1b722588fe@bootlin.com> References: <20241121-ge-ian-debug-imx8-clk-tree-v1-0-0f1b722588fe@bootlin.com> In-Reply-To: <20241121-ge-ian-debug-imx8-clk-tree-v1-0-0f1b722588fe@bootlin.com> To: Abel Vesa , Peng Fan , Michael Turquette , Stephen Boyd , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , Ying Liu , Marek Vasut Cc: Laurent Pinchart , linux-clk@vger.kernel.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Abel Vesa , Herve Codina , Luca Ceresoli , Thomas Petazzoni , Ian Ray , Miquel Raynal X-Mailer: b4 0.15-dev X-GND-Sasl: miquel.raynal@bootlin.com 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: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" In the context of the clock core, "determine" means we calculate a possible clock rate based on its hardware capabilities and its current upstream parent frequency. This is opposed to "round" which tries to find the best parent and best rate and "recalc" which is about finding the next output clock based on a parent frequency change. The prototype is based on clk_recalc() which does exactly the same for the "recalc" situation. Signed-off-by: Miquel Raynal --- drivers/clk/clk.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index d02451f951cf057d068f980d985c95deb861a2d9..f171539bbb842f57698249a475c62f3f5719ccd1 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -1927,6 +1927,18 @@ long clk_get_accuracy(struct clk *clk) } EXPORT_SYMBOL_GPL(clk_get_accuracy); +__maybe_unused +static unsigned long clk_determine(struct clk_core *core, unsigned long rate) +{ + struct clk_rate_request req = {}; + + clk_hw_init_rate_request(core->hw, &req, rate); + if (__clk_determine_rate(core->hw, &req)) + return 0; + + return req.rate; +} + static unsigned long clk_recalc(struct clk_core *core, unsigned long parent_rate) {