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 X-Spam-Level: X-Spam-Status: No, score=-9.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 146BAC282C8 for ; Mon, 28 Jan 2019 18:34:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DA2D120881 for ; Mon, 28 Jan 2019 18:34:14 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=linaro.org header.i=@linaro.org header.b="jSm1rIGl" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728267AbfA1SeN (ORCPT ); Mon, 28 Jan 2019 13:34:13 -0500 Received: from mail-wr1-f68.google.com ([209.85.221.68]:34671 "EHLO mail-wr1-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727966AbfA1Sdc (ORCPT ); Mon, 28 Jan 2019 13:33:32 -0500 Received: by mail-wr1-f68.google.com with SMTP id f7so19308335wrp.1 for ; Mon, 28 Jan 2019 10:33:31 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=+HV8Nby8D/Sn6SAvkoxC802zTo0ynRqZ7bbip7gTvlU=; b=jSm1rIGlQyTPja2+ldYbXDr+A1YqBNWmTeaDsPGMl7TadS2uye65vk+lYjGr8Yox3F 80uPZnH1mldfRsnbu+xQwdKYVWUR16/oHBEGlzc1Ck4LcODmicjYbz0BPrPxx7pAYW7i UdjwgF9oGxKzZb573jtPHKtsEE2WYnR1uGpxs= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=+HV8Nby8D/Sn6SAvkoxC802zTo0ynRqZ7bbip7gTvlU=; b=YicE8+GuqgpUy4yu3OMnZApWiCIC0EBkcAADlT2qIRpS0/kcUtZ0w7sT2BEyOZznYM b7xSfCWkagY2uasXZVorpDeb+Php9D0ohKBgyWt8OQlo59soh+T6oLj+xUzWW6F/Fu+V WXbb8UbkgpNh4iOkkSnkJvXDdtooTiACisHk1CA6WGSRm8Dq9BSq4ZlH/ziMxSJSN8D8 CiDvLF5iRSS/S/bgoJQj8wVgfnRyeBLAR5L4VxYthqacLh3DkdmPAvV+ypY1p7ektfZb KQjjYRxV64x1xNyCKcWIsP/OizNUiFgmkDdRqursJSSIuNTWnwwdnm2d0r26SlV2Gb2C qGbw== X-Gm-Message-State: AJcUukcD0/B+oOdrdNqBBtB04YXyNNaBOrfC/zmM1xF7mN0XdD3G0pJF F47vfDgC9wIPAphg5rfbS7+ctw== X-Google-Smtp-Source: ALg8bN56Btc4EmKhRmzfolsJuEPhFqCUgA9Tle2qQgKO/izjpdp9h32ZsM+121WwJEPOwl4jYwVVBQ== X-Received: by 2002:a5d:6808:: with SMTP id w8mr22035898wru.270.1548700410592; Mon, 28 Jan 2019 10:33:30 -0800 (PST) Received: from localhost.localdomain (233.red-81-47-145.staticip.rima-tde.net. [81.47.145.233]) by smtp.gmail.com with ESMTPSA id l19sm270082wme.21.2019.01.28.10.33.28 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 28 Jan 2019 10:33:29 -0800 (PST) From: Jorge Ramirez-Ortiz To: jorge.ramirez-ortiz@linaro.org, sboyd@kernel.org, bjorn.andersson@linaro.org, andy.gross@linaro.org, david.brown@linaro.org, jassisinghbrar@gmail.com, mark.rutland@arm.com, mturquette@baylibre.com, robh+dt@kernel.org, will.deacon@arm.com, arnd@arndb.de, horms+renesas@verge.net.au, heiko@sntech.de, sibis@codeaurora.org, enric.balletbo@collabora.com, jagan@amarulasolutions.com, olof@lixom.net Cc: vkoul@kernel.org, niklas.cassel@linaro.org, georgi.djakov@linaro.org, amit.kucheria@linaro.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-clk@vger.kernel.org, linux-arm-msm@vger.kernel.org, khasim.mohammed@linaro.org Subject: [PATCH v2 08/14] clk: qcom: hfpll: CLK_IGNORE_UNUSED Date: Mon, 28 Jan 2019 19:32:55 +0100 Message-Id: <1548700381-22376-9-git-send-email-jorge.ramirez-ortiz@linaro.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1548700381-22376-1-git-send-email-jorge.ramirez-ortiz@linaro.org> References: <1548700381-22376-1-git-send-email-jorge.ramirez-ortiz@linaro.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When COMMON_CLK_DISABLED_UNUSED is set, in an effort to save power and to keep the software model of the clock in line with reality, the framework transverses the clock tree and disables those clocks that were enabled by the firmware but have not been enabled by any device driver. If CPUFREQ is enabled, early during the system boot, it might attempt to change the CPU frequency ("set_rate"). If the HFPLL is selected as a provider, it will then change the rate for this clock. As boot continues, clk_disable_unused_subtree will run. Since it wont find a valid counter (enable_count) for a clock that is actually enabled it will attempt to disable it which will cause the CPU to stop. Notice that in this driver, calls to check whether the clock is enabled are routed via the is_enabled callback which queries the hardware. The following commit, rather than marking the clock critical and forcing the clock to be always enabled, addresses the above scenario making sure the clock is not disabled but it continues to rely on the firmware to enable the clock. Co-developed-by: Niklas Cassel Signed-off-by: Niklas Cassel Signed-off-by: Jorge Ramirez-Ortiz --- drivers/clk/qcom/hfpll.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/clk/qcom/hfpll.c b/drivers/clk/qcom/hfpll.c index 0ffed0d..9d92f5d 100644 --- a/drivers/clk/qcom/hfpll.c +++ b/drivers/clk/qcom/hfpll.c @@ -58,6 +58,7 @@ static int qcom_hfpll_probe(struct platform_device *pdev) .parent_names = (const char *[]){ "xo" }, .num_parents = 1, .ops = &clk_ops_hfpll, + .flags = CLK_IGNORE_UNUSED, }; h = devm_kzalloc(dev, sizeof(*h), GFP_KERNEL); -- 2.7.4