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[23.128.96.18]) by mx.google.com with ESMTP id a10si6903656jaa.15.2021.09.13.10.41.10; Mon, 13 Sep 2021 10:41:22 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=nxp.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345796AbhIMRka (ORCPT + 99 others); Mon, 13 Sep 2021 13:40:30 -0400 Received: from inva021.nxp.com ([92.121.34.21]:58796 "EHLO inva021.nxp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244247AbhIMRjp (ORCPT ); Mon, 13 Sep 2021 13:39:45 -0400 Received: from inva021.nxp.com (localhost [127.0.0.1]) by inva021.eu-rdc02.nxp.com (Postfix) with ESMTP id B49E02005E2; Mon, 13 Sep 2021 19:38:27 +0200 (CEST) Received: from inva024.eu-rdc02.nxp.com (inva024.eu-rdc02.nxp.com [134.27.226.22]) by inva021.eu-rdc02.nxp.com (Postfix) with ESMTP id 9CD002005DD; Mon, 13 Sep 2021 19:38:27 +0200 (CEST) Received: from fsr-ub1664-175.ea.freescale.net (fsr-ub1664-175.ea.freescale.net [10.171.82.40]) by inva024.eu-rdc02.nxp.com (Postfix) with ESMTP id CF2F020363; Mon, 13 Sep 2021 19:38:26 +0200 (CEST) From: Abel Vesa To: Rob Herring , Dong Aisheng , Shawn Guo , Sascha Hauer , Fabio Estevam , "catalin.marinas@arm.com" , Will Deacon , MyungJoo Ham , Kyungmin Park , Chanwoo Choi , Georgi Djakov , Adrian Hunter , Ulf Hansson , Ahmad Fatoum Cc: Pengutronix Kernel Team , linux-serial@vger.kernel.org, NXP Linux Team , Linux Kernel Mailing List , devicetree@vger.kernel.org, linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Abel Vesa Subject: [RFC 06/19] devfreq: imx8m-ddrc: Add late system sleep PM ops Date: Mon, 13 Sep 2021 20:38:01 +0300 Message-Id: <1631554694-9599-7-git-send-email-abel.vesa@nxp.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1631554694-9599-1-git-send-email-abel.vesa@nxp.com> References: <1631554694-9599-1-git-send-email-abel.vesa@nxp.com> X-Virus-Scanned: ClamAV using ClamSMTP Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Seems that, in order to be able to resume from suspend, the dram rate needs to be the highest one available. Therefore, add the late system suspend/resume PM ops which set the highest rate on suspend and the latest one used before suspending on resume. Signed-off-by: Abel Vesa --- drivers/devfreq/imx8m-ddrc.c | 28 +++++++++++++++++++++++++++- 1 file changed, 27 insertions(+), 1 deletion(-) diff --git a/drivers/devfreq/imx8m-ddrc.c b/drivers/devfreq/imx8m-ddrc.c index f18a5c3c1c03..f39741b4a0b0 100644 --- a/drivers/devfreq/imx8m-ddrc.c +++ b/drivers/devfreq/imx8m-ddrc.c @@ -72,6 +72,8 @@ struct imx8m_ddrc { struct clk *dram_alt; struct clk *dram_apb; + unsigned long suspend_rate; + unsigned long resume_rate; int freq_count; struct imx8m_ddrc_freq freq_table[IMX8M_DDRC_MAX_FREQ_COUNT]; }; @@ -271,6 +273,22 @@ static int imx8m_ddrc_target(struct device *dev, unsigned long *freq, u32 flags) return ret; } +static int imx8m_ddrc_suspend(struct device *dev) +{ + struct imx8m_ddrc *priv = dev_get_drvdata(dev); + + priv->resume_rate = clk_get_rate(priv->dram_core); + + return imx8m_ddrc_target(dev, &priv->suspend_rate, 0); +} + +static int imx8m_ddrc_resume(struct device *dev) +{ + struct imx8m_ddrc *priv = dev_get_drvdata(dev); + + return imx8m_ddrc_target(dev, &priv->resume_rate, 0); +} + static int imx8m_ddrc_get_cur_freq(struct device *dev, unsigned long *freq) { struct imx8m_ddrc *priv = dev_get_drvdata(dev); @@ -324,6 +342,9 @@ static int imx8m_ddrc_init_freq_info(struct device *dev) if (dev_pm_opp_add(dev, freq->rate * 250000, 0)) return -ENODEV; + + if (index == 0) + priv->suspend_rate = freq->rate * 250000; } return 0; @@ -399,11 +420,16 @@ static const struct of_device_id imx8m_ddrc_of_match[] = { }; MODULE_DEVICE_TABLE(of, imx8m_ddrc_of_match); +static const struct dev_pm_ops imx8m_ddrc_pm_ops = { + SET_LATE_SYSTEM_SLEEP_PM_OPS(imx8m_ddrc_suspend, imx8m_ddrc_resume) +}; + static struct platform_driver imx8m_ddrc_platdrv = { .probe = imx8m_ddrc_probe, .driver = { .name = "imx8m-ddrc-devfreq", - .of_match_table = imx8m_ddrc_of_match, + .pm = &imx8m_ddrc_pm_ops, + .of_match_table = of_match_ptr(imx8m_ddrc_of_match), }, }; module_platform_driver(imx8m_ddrc_platdrv); -- 2.31.1