From patchwork Tue Sep 10 02:10:04 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Aisheng Dong X-Patchwork-Id: 11138107 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 5AFC414DB for ; Mon, 9 Sep 2019 14:13:55 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 389E6218DE for ; Mon, 9 Sep 2019 14:13:55 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="GNWTpnLs" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 389E6218DE Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=nxp.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=zP5W6JfNX9Pdi3037uAPngYhiTCbF+YSCsITZ2Yqdso=; b=GNWTpnLsEagRmCUJwS1wiQf4xe lC++wfobGiamg1qi8XAhq6F7qZShYj7/24u6UkXJS31rrUn4gB9fSxayXx4d0HhOfxZ4GFIOluiGQ E56Tpk/wxgXJNBiYmWgg0jVc7lQUaiFaQtioKd4Qfz5cxOHLqwsSWzxGX6+7pKMwvFgDEvj2VWLcD xhjW1E595UK89xWPswwoNBw7aMQ5velr4PqYIYn+ru00RVl0JCdoSGR59kgi6PpmHmX1pxvYgHWUp wAsIkwExrqyC+CWaRReNMFvG9OBrYE6B3/QKOisCtfGjHhKXTDMj37f9Xk0tak1IvSejaTkvgOoSQ eXDN1+LA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1i7KQQ-0000Zx-FP; Mon, 09 Sep 2019 14:13:50 +0000 Received: from inva021.nxp.com ([92.121.34.21]) by bombadil.infradead.org with esmtps (Exim 4.92 #3 (Red Hat Linux)) id 1i7KOF-0006sY-Ba for linux-arm-kernel@lists.infradead.org; Mon, 09 Sep 2019 14:11:37 +0000 Received: from inva021.nxp.com (localhost [127.0.0.1]) by inva021.eu-rdc02.nxp.com (Postfix) with ESMTP id 25B452001B4; Mon, 9 Sep 2019 16:11:34 +0200 (CEST) Received: from invc005.ap-rdc01.nxp.com (invc005.ap-rdc01.nxp.com [165.114.16.14]) by inva021.eu-rdc02.nxp.com (Postfix) with ESMTP id EB5792003F4; Mon, 9 Sep 2019 16:11:29 +0200 (CEST) Received: from localhost.localdomain (shlinux2.ap.freescale.net [10.192.224.44]) by invc005.ap-rdc01.nxp.com (Postfix) with ESMTP id 867244031C; Mon, 9 Sep 2019 22:11:22 +0800 (SGT) From: Dong Aisheng To: linux-clk@vger.kernel.org Subject: [PATCH V5 07/11] clk: imx: scu: add suspend/resume support Date: Mon, 9 Sep 2019 22:10:04 -0400 Message-Id: <1568081408-26800-8-git-send-email-aisheng.dong@nxp.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1568081408-26800-1-git-send-email-aisheng.dong@nxp.com> References: <1568081408-26800-1-git-send-email-aisheng.dong@nxp.com> X-Virus-Scanned: ClamAV using ClamSMTP X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190909_071135_547960_654D3027 X-CRM114-Status: GOOD ( 10.74 ) X-Spam-Score: -2.3 (--) X-Spam-Report: SpamAssassin version 3.4.2 on bombadil.infradead.org summary: Content analysis details: (-2.3 points) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at https://www.dnswl.org/, medium trust [92.121.34.21 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record 0.0 DATE_IN_FUTURE_06_12 Date: is 6 to 12 hours after Received: date X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Dong Aisheng , sboyd@kernel.org, mturquette@baylibre.com, linux-imx@nxp.com, kernel@pengutronix.de, fabio.estevam@nxp.com, shawnguo@kernel.org, linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org Clock state will be lost when its power domain is completely off during system suspend/resume. So we save and restore the state accordingly in suspend/resume callback. Cc: Stephen Boyd Cc: Shawn Guo Cc: Sascha Hauer Cc: Michael Turquette Signed-off-by: Dong Aisheng --- ChangeLog: v5: * make suspend/resume function static v4: no changes v3: new patch --- drivers/clk/imx/clk-scu.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) diff --git a/drivers/clk/imx/clk-scu.c b/drivers/clk/imx/clk-scu.c index 04a0514..000ce6e 100644 --- a/drivers/clk/imx/clk-scu.c +++ b/drivers/clk/imx/clk-scu.c @@ -46,6 +46,10 @@ struct clk_scu { struct clk_hw hw; u16 rsrc_id; u8 clk_type; + + /* for state save&restore */ + bool is_enabled; + u32 rate; }; /* @@ -427,6 +431,9 @@ struct clk_hw *__imx_clk_scu(struct device *dev, const char *name, hw = ERR_PTR(ret); } + if (dev) + dev_set_drvdata(dev, clk); + return hw; } @@ -483,10 +490,52 @@ static int imx_clk_scu_probe(struct platform_device *pdev) return 0; } +static int __maybe_unused imx_clk_scu_suspend(struct device *dev) +{ + struct clk_scu *clk = dev_get_drvdata(dev); + + clk->rate = clk_hw_get_rate(&clk->hw); + clk->is_enabled = clk_hw_is_enabled(&clk->hw); + + if (clk->rate) + dev_dbg(dev, "save rate %d\n", clk->rate); + + if (clk->is_enabled) + dev_dbg(dev, "save enabled state\n"); + + return 0; +} + +static int __maybe_unused imx_clk_scu_resume(struct device *dev) +{ + struct clk_scu *clk = dev_get_drvdata(dev); + int ret = 0; + + if (clk->rate) { + ret = clk_scu_set_rate(&clk->hw, clk->rate, 0); + dev_dbg(dev, "restore rate %d %s\n", clk->rate, + !ret ? "success" : "failed"); + } + + if (clk->is_enabled) { + ret = clk_scu_prepare(&clk->hw); + dev_dbg(dev, "restore enabled state %s\n", + !ret ? "success" : "failed"); + } + + return ret; +} + +static const struct dev_pm_ops imx_clk_scu_pm_ops = { + SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(imx_clk_scu_suspend, + imx_clk_scu_resume) +}; + static struct platform_driver imx_clk_scu_driver = { .driver = { .name = "imx-scu-clk", .suppress_bind_attrs = true, + .pm = &imx_clk_scu_pm_ops, }, .probe = imx_clk_scu_probe, };