From patchwork Wed Jul 5 17:43:53 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Valentin Caron X-Patchwork-Id: 13302528 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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 4DE3BEB64DD for ; Wed, 5 Jul 2023 17:44:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=3tAWgBTmzIyu9nn9uaGW8YUqSF86NKSno5bHPqZrSAg=; b=K7CAQNb9cuWNkM pfpupVtDULOYQTI5+Kr/e6qlZt/hIfdHIsNQ1Cl/o/5up+RP2/C71O1hjy/Hp5+k/riL8TwYykCaj HZuEb0UKbv0k/07jFHB0hKWN2dSe5jxlLd7M9fX//f/fxtLArbSLs+nGKxR+YYFWyVPNKRMWiiAUL 8FQMRHdGxz+stAifqXD4dozydTi6Gm30RTWT1v2MKBukB6O757usmU8d8Ud5gaHPTuTDN1S/ajPvT O51WXeePsIyMF+o5dghd/ysjf5KQV/SJi+/HlzRM9UtXEuPrWy5kfLokcNLz1enuZfYV1DOL14VW9 TiEp7tUyEDT00Lc4YeTw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qH6Y0-00GeY2-2W; Wed, 05 Jul 2023 17:44:12 +0000 Received: from mx07-00178001.pphosted.com ([185.132.182.106]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1qH6Xv-00GeUz-0U for linux-arm-kernel@lists.infradead.org; Wed, 05 Jul 2023 17:44:08 +0000 Received: from pps.filterd (m0241204.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 365ELIu5007738; Wed, 5 Jul 2023 19:44:05 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=foss.st.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding : content-type; s=selector1; bh=Xy/hUYzK/4Hs4UPMJUFskvFcKLM1GyUKIZn77IV+Fes=; b=vCwbkT5nm6PutN3dXl9Xg3lNmyhsfEQzI1V6KG6psfJ3174Bd5q4ZqZJRtQKck2kQcLk SQVJBYMtrbtVbWrigeEVjf63CTsxVbfvpQwqF6/YLGBQft7yBzLLwKeoxRlRZnn9/wRh OTHJCJ/j+xyjJTiJcTiXB12mLmZavpSaObJkIah2AY0+D5S2qgTz/E7/hlMFEuz1Bf7L g099DFKggv6L1il6DpPjDVGaCHFVqXWtrQAmgEW/t++9q9Mkx55QzozRDOLZ9c9QBozF i59B6taLIWgfaTLp1nN5VC1r/j0rHJyaCY0DWZ0JwyTK8muth8IUNYyh6BoBM2Ppju0L DA== Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx07-00178001.pphosted.com (PPS) with ESMTPS id 3rna75h6g0-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 05 Jul 2023 19:44:05 +0200 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 8AB51100057; Wed, 5 Jul 2023 19:44:04 +0200 (CEST) Received: from Webmail-eu.st.com (shfdag1node1.st.com [10.75.129.69]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id 82F56252250; Wed, 5 Jul 2023 19:44:04 +0200 (CEST) Received: from localhost (10.201.20.168) by SHFDAG1NODE1.st.com (10.75.129.69) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.21; Wed, 5 Jul 2023 19:44:04 +0200 From: Valentin Caron To: Alexandre Belloni , Alessandro Zummo CC: Alexandre Torgue , Antonio Borneo , Christophe Guibout , Gabriel Fernandez , , , , , Valentin Caron Subject: [PATCH v2 3/7] rtc: stm32: improve rtc precision Date: Wed, 5 Jul 2023 19:43:53 +0200 Message-ID: <20230705174357.353616-4-valentin.caron@foss.st.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230705174357.353616-1-valentin.caron@foss.st.com> References: <20230705174357.353616-1-valentin.caron@foss.st.com> MIME-Version: 1.0 X-Originating-IP: [10.201.20.168] X-ClientProxiedBy: SHFCAS1NODE2.st.com (10.75.129.73) To SHFDAG1NODE1.st.com (10.75.129.69) X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.957,Hydra:6.0.591,FMLib:17.11.176.26 definitions=2023-07-05_09,2023-07-05_01,2023-05-22_02 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230705_104407_480705_5818654B X-CRM114-Status: GOOD ( 22.06 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Christophe Guibout The rtc is used to update the stgen counter on wake up from low power modes, so it needs to be as much accurate as possible. The maximization of asynchronous divider leads to a 4ms rtc precision clock. By decreasing pred_a to 0, it will have pred_s=32767 (when need_accuracy is true), so stgen clock becomes more accurate with 30us precision. Nevertheless this will leads to an increase of power consumption. Signed-off-by: Christophe Guibout Signed-off-by: Valentin Caron --- drivers/rtc/rtc-stm32.c | 26 ++++++++++++++++++++++---- 1 file changed, 22 insertions(+), 4 deletions(-) diff --git a/drivers/rtc/rtc-stm32.c b/drivers/rtc/rtc-stm32.c index bd7a59a07537..cad88668bcfb 100644 --- a/drivers/rtc/rtc-stm32.c +++ b/drivers/rtc/rtc-stm32.c @@ -114,6 +114,7 @@ struct stm32_rtc_data { void (*clear_events)(struct stm32_rtc *rtc, unsigned int flags); bool has_pclk; bool need_dbp; + bool need_accuracy; }; struct stm32_rtc { @@ -545,6 +546,7 @@ static void stm32_rtc_clear_events(struct stm32_rtc *rtc, static const struct stm32_rtc_data stm32_rtc_data = { .has_pclk = false, .need_dbp = true, + .need_accuracy = false, .regs = { .tr = 0x00, .dr = 0x04, @@ -566,6 +568,7 @@ static const struct stm32_rtc_data stm32_rtc_data = { static const struct stm32_rtc_data stm32h7_rtc_data = { .has_pclk = true, .need_dbp = true, + .need_accuracy = false, .regs = { .tr = 0x00, .dr = 0x04, @@ -596,6 +599,7 @@ static void stm32mp1_rtc_clear_events(struct stm32_rtc *rtc, static const struct stm32_rtc_data stm32mp1_data = { .has_pclk = true, .need_dbp = false, + .need_accuracy = true, .regs = { .tr = 0x00, .dr = 0x04, @@ -636,11 +640,25 @@ static int stm32_rtc_init(struct platform_device *pdev, pred_a_max = STM32_RTC_PRER_PRED_A >> STM32_RTC_PRER_PRED_A_SHIFT; pred_s_max = STM32_RTC_PRER_PRED_S >> STM32_RTC_PRER_PRED_S_SHIFT; - for (pred_a = pred_a_max; pred_a + 1 > 0; pred_a--) { - pred_s = (rate / (pred_a + 1)) - 1; + if (rate > (pred_a_max + 1) * (pred_s_max + 1)) { + dev_err(&pdev->dev, "rtc_ck rate is too high: %dHz\n", rate); + return -EINVAL; + } + + if (rtc->data->need_accuracy) { + for (pred_a = 0; pred_a <= pred_a_max; pred_a++) { + pred_s = (rate / (pred_a + 1)) - 1; - if (((pred_s + 1) * (pred_a + 1)) == rate) - break; + if (pred_s <= pred_s_max && ((pred_s + 1) * (pred_a + 1)) == rate) + break; + } + } else { + for (pred_a = pred_a_max; pred_a + 1 > 0; pred_a--) { + pred_s = (rate / (pred_a + 1)) - 1; + + if (((pred_s + 1) * (pred_a + 1)) == rate) + break; + } } /*