From patchwork Thu Oct 19 08:40:39 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Varadarajan Narayanan X-Patchwork-Id: 736126 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 68CB6CDB483 for ; Thu, 19 Oct 2023 08:42:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235261AbjJSImR (ORCPT ); Thu, 19 Oct 2023 04:42:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47508 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344946AbjJSImB (ORCPT ); Thu, 19 Oct 2023 04:42:01 -0400 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3AF21D43; Thu, 19 Oct 2023 01:41:54 -0700 (PDT) Received: from pps.filterd (m0279871.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 39J8Pv1H031841; Thu, 19 Oct 2023 08:41:28 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=J+RrOxHnHVj5svT/nwmDwiuOMNv1BKVPDHfQq+9ETLs=; b=YoBInFCqGSzgviV+MEZyD4JxyIm7PtK7U+qV5w891O7+j5c7IAUWQizvoFUjNKAbjQFX o9iYnrzhAzZV1aLsBK/ky/DlneZ9ZhlVa9lHo8BUKHK8+GGAzbvThBrNg+81GqwM1Vb9 MOUc/lTDhTUa7MIzU7cwQlPt7qolHdOJkfllesSSPIc/aeEyohwEAu0fAUqaV/R3NWZM 4xe4ihaXXWJCfjMRceS0xXSekv1+Bd6+Yu332dCAzD4Ku9N/YlFBEj7v1QG5tHHiXyM9 tqrImVxuz3dXwlXwrVMW+gJBkhY/+NiQ/lydHJP06wc3IyAg1BT07dIYvGKTHYmr/Lmd kA== Received: from nasanppmta03.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3tt5v83fy1-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 19 Oct 2023 08:41:28 +0000 Received: from nasanex01a.na.qualcomm.com (nasanex01a.na.qualcomm.com [10.52.223.231]) by NASANPPMTA03.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 39J8fQgs018827 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 19 Oct 2023 08:41:26 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 15.2.1118.39; Thu, 19 Oct 2023 01:41:20 -0700 From: Varadarajan Narayanan To: , , , , , , , , , , , , , , , , , CC: Varadarajan Narayanan Subject: [PATCH v4 5/9] clk: qcom: apss-ipq6018: ipq5332: add safe source switch for a53pll Date: Thu, 19 Oct 2023 14:10:39 +0530 Message-ID: <9ebae0e9780745091274562a2b9afd856241dbdc.1697694811.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: odQDSIoyIPih1IKpssoZ4X-d9BKL0k8K X-Proofpoint-ORIG-GUID: odQDSIoyIPih1IKpssoZ4X-d9BKL0k8K X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.980,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-10-19_06,2023-10-18_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 mlxlogscore=999 lowpriorityscore=0 phishscore=0 impostorscore=0 suspectscore=0 mlxscore=0 clxscore=1015 bulkscore=0 priorityscore=1501 spamscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2309180000 definitions=main-2310190070 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. Additionally, not all SKUs of IPQ53xx support scaling. Hence, do the above to the SKUs that support scaling. Signed-off-by: Kathiravan T Signed-off-by: Varadarajan Narayanan --- v3: devm_kzalloc for cpu_clk_notifier instead of global static v2: Handle ABORT_RATE_CHANGE Use local variable for apcs_alias0_clk_src.clkr.hw Use single line comment instead of multi line style --- drivers/clk/qcom/apss-ipq6018.c | 58 ++++++++++++++++++++++++++++++++++++++++- 1 file changed, 57 insertions(+), 1 deletion(-) diff --git a/drivers/clk/qcom/apss-ipq6018.c b/drivers/clk/qcom/apss-ipq6018.c index 4e13a08..db65b0d 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 +87,68 @@ 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) +{ + struct clk_hw *hw; + u8 index; + int err; + + if (action == PRE_RATE_CHANGE) + index = P_GPLL0; + else if (action == POST_RATE_CHANGE || action == ABORT_RATE_CHANGE) + index = P_APSS_PLL_EARLY; + else + return NOTIFY_OK; + + hw = &apcs_alias0_clk_src.clkr.hw; + err = clk_rcg2_mux_closest_ops.set_parent(hw, index); + + return notifier_from_errno(err); +} + static int apss_ipq6018_probe(struct platform_device *pdev) { + struct notifier_block *cpu_clk_notifier; 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: + cpu_clk_notifier = devm_kzalloc(&pdev->dev, + sizeof(*cpu_clk_notifier), + GFP_KERNEL); + if (!cpu_clk_notifier) + return -ENOMEM; + + cpu_clk_notifier->notifier_call = cpu_clk_notifier_fn; + + 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 = {