From patchwork Thu Sep 7 05:21:39 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Varadarajan Narayanan X-Patchwork-Id: 720749 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 8B87FEE14D7 for ; Thu, 7 Sep 2023 05:22:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243286AbjIGFWq (ORCPT ); Thu, 7 Sep 2023 01:22:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40428 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243185AbjIGFWo (ORCPT ); Thu, 7 Sep 2023 01:22:44 -0400 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E0B951BD0; Wed, 6 Sep 2023 22:22:29 -0700 (PDT) Received: from pps.filterd (m0279864.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 3872dl6B018368; Thu, 7 Sep 2023 05:22:22 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-type; s=qcppdkim1; bh=/WmI8wsVRAVdrw5/a19tlbQiCkJceggErAbjp9Ta5sA=; b=H7PKjjfM0fDBhmewQLS9ICQYOKXoBEqeDxKn54z6cNcHZCXpEEYjy7J+V++ZUC/5mIwK pcOleZOvMukbHaAhx1wm0NCidG7Bsp2EkkHo/mHY3elm6xjbwBIdvOvPJWlagl5VHaGE HioNiPt7gm8fqbvyAwbhKe4LbkZpZD6vOYVTEdCbgJCawR0x1mFkZOHcVBvrosY/QXGA ri3PAfXkIX/PoBnRNg293yBBsdcus6X7FVVhfHcHVuMH1hazOEn8Lbbqrphg74Lmj9i2 oEp4OJu5F8Jll+D34zKsKZ7GdWLAMVeqMEZdEUuhVcnvazGbapDDttQvTZq2ANB8rhXi pw== Received: from nasanppmta01.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3sy4bqgebq-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 07 Sep 2023 05:22:22 +0000 Received: from nasanex01a.na.qualcomm.com (nasanex01a.na.qualcomm.com [10.52.223.231]) by NASANPPMTA01.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 3875MLZU016172 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 7 Sep 2023 05:22:21 GMT Received: from varda-linux.qualcomm.com (10.80.80.8) by nasanex01a.na.qualcomm.com (10.52.223.231) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.36; Wed, 6 Sep 2023 22:22:16 -0700 From: Varadarajan Narayanan To: , , , , , , , , , , , , , , , , CC: Varadarajan Narayanan Subject: [PATCH v1 04/10] clk: qcom: apss-ipq6018: ipq5332: add safe source switch for a53pll Date: Thu, 7 Sep 2023 10:51:39 +0530 Message-ID: <5e3c29df2b42cceb8072b00546a78e1b99b2d374.1693996662.git.quic_varada@quicinc.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: References: MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01b.na.qualcomm.com (10.46.141.250) To nasanex01a.na.qualcomm.com (10.52.223.231) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: zBuqeQ_fBzb0LgdK5udURgEk22RBEVi2 X-Proofpoint-ORIG-GUID: zBuqeQ_fBzb0LgdK5udURgEk22RBEVi2 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.267,Aquarius:18.0.957,Hydra:6.0.601,FMLib:17.11.176.26 definitions=2023-09-06_12,2023-09-05_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 clxscore=1015 priorityscore=1501 lowpriorityscore=0 malwarescore=0 suspectscore=0 phishscore=0 spamscore=0 mlxlogscore=999 mlxscore=0 impostorscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2308100000 definitions=main-2309070045 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org Stromer Plus PLL found on IPQ53xx doesn't support dynamic frequency scaling. To achieve the same, we need to park the APPS PLL source to GPLL0, re configure the PLL and then switch the source to APSS_PLL_EARLY. To support this, register a clock notifier to get the PRE_RATE and POST_RATE notification. Change the APSS PLL source to GPLL0 when PRE_RATE notification is received, then configure the PLL and then change back the source to APSS_PLL_EARLY. Signed-off-by: Kathiravan T Signed-off-by: Varadarajan Narayanan --- drivers/clk/qcom/apss-ipq6018.c | 54 ++++++++++++++++++++++++++++++++++++++++- 1 file changed, 53 insertions(+), 1 deletion(-) diff --git a/drivers/clk/qcom/apss-ipq6018.c b/drivers/clk/qcom/apss-ipq6018.c index 4e13a08..ffb6ab5 100644 --- a/drivers/clk/qcom/apss-ipq6018.c +++ b/drivers/clk/qcom/apss-ipq6018.c @@ -9,8 +9,11 @@ #include #include #include +#include +#include #include +#include #include "common.h" #include "clk-regmap.h" @@ -84,15 +87,64 @@ static const struct qcom_cc_desc apss_ipq6018_desc = { .num_clks = ARRAY_SIZE(apss_ipq6018_clks), }; +static int cpu_clk_notifier_fn(struct notifier_block *nb, unsigned long action, + void *data) +{ + u8 index; + int err; + + if (action == PRE_RATE_CHANGE) + index = P_GPLL0; + else if (action == POST_RATE_CHANGE) + index = P_APSS_PLL_EARLY; + else + return 0; + + err = clk_rcg2_mux_closest_ops.set_parent(&apcs_alias0_clk_src.clkr.hw, + index); + + return notifier_from_errno(err); +} + +static struct notifier_block cpu_clk_notifier = { + .notifier_call = cpu_clk_notifier_fn, +}; + static int apss_ipq6018_probe(struct platform_device *pdev) { struct regmap *regmap; + u32 soc_id; + int ret; + + ret = qcom_smem_get_soc_id(&soc_id); + if (ret) + return ret; regmap = dev_get_regmap(pdev->dev.parent, NULL); if (!regmap) return -ENODEV; - return qcom_cc_really_probe(pdev, &apss_ipq6018_desc, regmap); + ret = qcom_cc_really_probe(pdev, &apss_ipq6018_desc, regmap); + if (ret) + return ret; + + switch (soc_id) { + /* + * Only below variants of IPQ53xx support scaling + */ + case QCOM_ID_IPQ5332: + case QCOM_ID_IPQ5322: + case QCOM_ID_IPQ5300: + ret = clk_notifier_register(apcs_alias0_clk_src.clkr.hw.clk, + &cpu_clk_notifier); + if (ret) + return ret; + break; + default: + break; + } + + return 0; } static struct platform_driver apss_ipq6018_driver = {