From patchwork Fri Nov 4 13:56:28 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Doug Anderson X-Patchwork-Id: 13031987 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 C03EAC433FE for ; Fri, 4 Nov 2022 13:57:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231415AbiKDN5J (ORCPT ); Fri, 4 Nov 2022 09:57:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46948 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229699AbiKDN5I (ORCPT ); Fri, 4 Nov 2022 09:57:08 -0400 Received: from mail-pl1-x636.google.com (mail-pl1-x636.google.com [IPv6:2607:f8b0:4864:20::636]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AC6572F3B3 for ; Fri, 4 Nov 2022 06:57:02 -0700 (PDT) Received: by mail-pl1-x636.google.com with SMTP id y4so4955210plb.2 for ; Fri, 04 Nov 2022 06:57:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=XPBXRa9w7YK7/mX5TsWakQgciRU5D3ll2jqB5IqI2G0=; b=XrWseRGDX/666oj7zxpWUZ59i7mlMuNt+zLtA+mT+5ZFDMOrzDCKzoLrCXfYZGut9p HU0xr7K/MflpEV76tvyrBADQftwgoYj2BwchTPnDyg8dKm9l6NjrUXSBhepRU5r1mbvi 38IZfsDxw3QQLlDN+cBVxOwqMpEsurI1C3n5k= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=XPBXRa9w7YK7/mX5TsWakQgciRU5D3ll2jqB5IqI2G0=; b=h352wvwCM10RmAHynC6zyTRIUSqI4AH753NBb1XThygjIr9P4a+50cuJ/+Q89Qj9op S1FelhRR58rhKpZu8ii1UGdsCuq3Zr6TsJxfMP1Q+Z77EdihLG5EefjSnSu00uAHZkUC LvGrtS61hbHwCCMo9bPWnBTiZ9Ttj5bcYQC3vo3lp7xan1T4VS1rEl+3+6MMRaPBN+dF H5+lJC/RUP3sgn6bLfM+9or40mQOa5QKNVbcS9X/Oja0CPu4drrHG900jKWBf/SqDMvk AuMjvA8kilOIPvUoAaKZrQEmeynF7jzacV5WJmLOZV3xjoWOMsG84GOfaLf2VANMGpST CVKw== X-Gm-Message-State: ACrzQf0OIRthXDH2bSBIAcOlDcLs1KPBPlO7bMF799ZNrWpE5IRS9RRo mir8GRPuLfalIvOXyvoA0K559w== X-Google-Smtp-Source: AMsMyM5bJ5JuDXM35109KHkeAOPwSNVq1zbsNH9g1O9EhMk7qkuZYEsfp3MvFY6cS9Gr8VB8ow92dw== X-Received: by 2002:a17:903:240a:b0:183:6555:7a89 with SMTP id e10-20020a170903240a00b0018365557a89mr35545147plo.68.1667570222142; Fri, 04 Nov 2022 06:57:02 -0700 (PDT) Received: from tictac2.mtv.corp.google.com ([2620:15c:9d:2:5e74:f068:4840:3631]) by smtp.gmail.com with ESMTPSA id m6-20020a62a206000000b0056bf29c9ba3sm2829367pff.146.2022.11.04.06.56.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 04 Nov 2022 06:57:00 -0700 (PDT) From: Douglas Anderson To: Stephen Boyd , Bjorn Andersson Cc: Taniya Das , Dmitry Baryshkov , Judy Hsiao , Srinivasa Rao Mandadapu , Matthias Kaehlcke , Douglas Anderson , Andy Gross , Konrad Dybcio , Michael Turquette , Stephen Boyd , Taniya Das , linux-arm-msm@vger.kernel.org, linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 1/3] clk: qcom: lpass-sc7280: Fix pm_runtime usage Date: Fri, 4 Nov 2022 06:56:28 -0700 Message-Id: <20221104064055.1.I00a0e4564a25489e85328ec41636497775627564@changeid> X-Mailer: git-send-email 2.38.1.431.g37b22c650d-goog MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-clk@vger.kernel.org The pm_runtime usage in lpass-sc7280 was broken in quite a few ways. Specifically: 1. At the end of probe it called "put" twice. This is a no-no and will end us up with a negative usage count. Even worse than calling "put" twice, it never called "get" once. Thus after bootup it could be seen that the runtime usage of the devices managed by this driver was -2. 2. In some error cases it manually called pm_runtime_disable() even though it had previously used devm_add_action_or_reset() to set this up to be called automatically. This meant that in these error cases we'd double-call pm_runtime_disable(). 3. It forgot to call undo pm_runtime_use_autosuspend(), which can sometimes have subtle problems (and the docs specifically mention that you need to undo this function). Overall the above seriously calls into question how this driver is working. It seems like a combination of "it doesn't", "by luck", and "because of the weirdness of runtime_pm". Specifically I put a printout to the serial console every time the runtime suspend/resume was called for the two devices created by this driver (I wrapped the pm_clk calls). When I had serial console enabled, I found that the calls got resumed at bootup (when the clk core probed and before our double-put) and then never touched again. That's no good. [ 0.829997] DOUG: my_pm_clk_resume, usage=1 [ 0.835487] DOUG: my_pm_clk_resume, usage=1 When I disabled serial console (speeding up boot), I got a different pattern, which I guess (?) is better: [ 0.089767] DOUG: my_pm_clk_resume, usage=1 [ 0.090507] DOUG: my_pm_clk_resume, usage=1 [ 0.151885] DOUG: my_pm_clk_suspend, usage=-2 [ 0.151914] DOUG: my_pm_clk_suspend, usage=-2 [ 1.825747] DOUG: my_pm_clk_resume, usage=-1 [ 1.825774] DOUG: my_pm_clk_resume, usage=-1 [ 1.888269] DOUG: my_pm_clk_suspend, usage=-2 [ 1.888282] DOUG: my_pm_clk_suspend, usage=-2 These different patterns have to do with the fact that the core PM Runtime code really isn't designed to be robust to negative usage counts and sometimes may happen to stumble upon a behavior that happens to "work". For instance, you can see that __pm_runtime_suspend() will treat any non-zero value (including negative numbers) as if the device is in use. In any case, let's fix the driver to be correct. We'll hold a pm_runtime reference for the whole probe and then drop it (once!) at the end. We'll get rid of manual pm_runtime_disable() calls in the error handling. We'll also switch to devm_pm_runtime_enable(), which magically handles undoing pm_runtime_use_autosuspend() as of commit b4060db9251f ("PM: runtime: Have devm_pm_runtime_enable() handle pm_runtime_dont_use_autosuspend()"). While we're at this, let's also use devm_pm_clk_create() instead of rolling it ourselves. Note that the above changes make it obvious that lpassaudio_create_pm_clks() was doing more than just creating clocks. It was also setting up pm_runtime parameters. Let's rename it. All of these problems were found by code inspection. I started looking at this driver because it was involved in a deadlock that I reported a while ago [1]. Though I bisected the deadlock to commit 1b771839de05 ("clk: qcom: gdsc: enable optional power domain support"), it was never really clear why that patch affected it other than a luck of timing changes. I'll also note that by fixing the timing (as done in this change) we also seem to aboid the deadlock, which is a nice benefit. Also note that some of the fixes here are much the same type of stuff that Dmitry did in commit 72cfc73f4663 ("clk: qcom: use devm_pm_runtime_enable and devm_pm_clk_create"), but I guess lpassaudiocc-sc7280.c didn't exist then. [1] https://lore.kernel.org/r/20220922154354.2486595-1-dianders@chromium.org Fixes: a9dd26639d05 ("clk: qcom: lpass: Add support for LPASS clock controller for SC7280") Signed-off-by: Douglas Anderson Reviewed-by: Stephen Boyd Reviewed-by: Dmitry Baryshkov --- drivers/clk/qcom/lpassaudiocc-sc7280.c | 55 ++++++++++---------------- 1 file changed, 21 insertions(+), 34 deletions(-) diff --git a/drivers/clk/qcom/lpassaudiocc-sc7280.c b/drivers/clk/qcom/lpassaudiocc-sc7280.c index 063e0365f311..1339f9211a14 100644 --- a/drivers/clk/qcom/lpassaudiocc-sc7280.c +++ b/drivers/clk/qcom/lpassaudiocc-sc7280.c @@ -722,33 +722,17 @@ static const struct of_device_id lpass_audio_cc_sc7280_match_table[] = { }; MODULE_DEVICE_TABLE(of, lpass_audio_cc_sc7280_match_table); -static void lpassaudio_pm_runtime_disable(void *data) -{ - pm_runtime_disable(data); -} - -static void lpassaudio_pm_clk_destroy(void *data) -{ - pm_clk_destroy(data); -} - -static int lpassaudio_create_pm_clks(struct platform_device *pdev) +static int lpass_audio_setup_runtime_pm(struct platform_device *pdev) { int ret; pm_runtime_use_autosuspend(&pdev->dev); pm_runtime_set_autosuspend_delay(&pdev->dev, 50); - pm_runtime_enable(&pdev->dev); - - ret = devm_add_action_or_reset(&pdev->dev, lpassaudio_pm_runtime_disable, &pdev->dev); - if (ret) - return ret; - - ret = pm_clk_create(&pdev->dev); + ret = devm_pm_runtime_enable(&pdev->dev); if (ret) return ret; - ret = devm_add_action_or_reset(&pdev->dev, lpassaudio_pm_clk_destroy, &pdev->dev); + ret = devm_pm_clk_create(&pdev->dev); if (ret) return ret; @@ -756,7 +740,7 @@ static int lpassaudio_create_pm_clks(struct platform_device *pdev) if (ret < 0) dev_err(&pdev->dev, "failed to acquire iface clock\n"); - return ret; + return pm_runtime_resume_and_get(&pdev->dev); } static int lpass_audio_cc_sc7280_probe(struct platform_device *pdev) @@ -765,7 +749,7 @@ static int lpass_audio_cc_sc7280_probe(struct platform_device *pdev) struct regmap *regmap; int ret; - ret = lpassaudio_create_pm_clks(pdev); + ret = lpass_audio_setup_runtime_pm(pdev); if (ret) return ret; @@ -775,8 +759,8 @@ static int lpass_audio_cc_sc7280_probe(struct platform_device *pdev) regmap = qcom_cc_map(pdev, desc); if (IS_ERR(regmap)) { - pm_runtime_disable(&pdev->dev); - return PTR_ERR(regmap); + ret = PTR_ERR(regmap); + goto exit; } clk_zonda_pll_configure(&lpass_audio_cc_pll, regmap, &lpass_audio_cc_pll_config); @@ -788,20 +772,18 @@ static int lpass_audio_cc_sc7280_probe(struct platform_device *pdev) ret = qcom_cc_really_probe(pdev, &lpass_audio_cc_sc7280_desc, regmap); if (ret) { dev_err(&pdev->dev, "Failed to register LPASS AUDIO CC clocks\n"); - pm_runtime_disable(&pdev->dev); - return ret; + goto exit; } ret = qcom_cc_probe_by_index(pdev, 1, &lpass_audio_cc_reset_sc7280_desc); if (ret) { dev_err(&pdev->dev, "Failed to register LPASS AUDIO CC Resets\n"); - pm_runtime_disable(&pdev->dev); - return ret; + goto exit; } pm_runtime_mark_last_busy(&pdev->dev); +exit: pm_runtime_put_autosuspend(&pdev->dev); - pm_runtime_put_sync(&pdev->dev); return ret; } @@ -839,14 +821,15 @@ static int lpass_aon_cc_sc7280_probe(struct platform_device *pdev) struct regmap *regmap; int ret; - ret = lpassaudio_create_pm_clks(pdev); + ret = lpass_audio_setup_runtime_pm(pdev); if (ret) return ret; if (of_property_read_bool(pdev->dev.of_node, "qcom,adsp-pil-mode")) { lpass_audio_cc_sc7280_regmap_config.name = "cc"; desc = &lpass_cc_sc7280_desc; - return qcom_cc_probe(pdev, desc); + ret = qcom_cc_probe(pdev, desc); + goto exit; } lpass_audio_cc_sc7280_regmap_config.name = "lpasscc_aon"; @@ -854,18 +837,22 @@ static int lpass_aon_cc_sc7280_probe(struct platform_device *pdev) desc = &lpass_aon_cc_sc7280_desc; regmap = qcom_cc_map(pdev, desc); - if (IS_ERR(regmap)) - return PTR_ERR(regmap); + if (IS_ERR(regmap)) { + ret = PTR_ERR(regmap); + goto exit; + } clk_lucid_pll_configure(&lpass_aon_cc_pll, regmap, &lpass_aon_cc_pll_config); ret = qcom_cc_really_probe(pdev, &lpass_aon_cc_sc7280_desc, regmap); - if (ret) + if (ret) { dev_err(&pdev->dev, "Failed to register LPASS AON CC clocks\n"); + goto exit; + } pm_runtime_mark_last_busy(&pdev->dev); +exit: pm_runtime_put_autosuspend(&pdev->dev); - pm_runtime_put_sync(&pdev->dev); return ret; }