From patchwork Wed Jul 25 05:51:22 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "J, KEERTHY" X-Patchwork-Id: 10543465 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id CAC5E14E2 for ; Wed, 25 Jul 2018 05:52:18 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id BBFFB29328 for ; Wed, 25 Jul 2018 05:52:18 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B0554295D6; Wed, 25 Jul 2018 05:52:18 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI,T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4A79229328 for ; Wed, 25 Jul 2018 05:52:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728416AbeGYHCL (ORCPT ); Wed, 25 Jul 2018 03:02:11 -0400 Received: from fllv0015.ext.ti.com ([198.47.19.141]:51608 "EHLO fllv0015.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728100AbeGYHCL (ORCPT ); Wed, 25 Jul 2018 03:02:11 -0400 Received: from dflxv15.itg.ti.com ([128.247.5.124]) by fllv0015.ext.ti.com (8.15.2/8.15.2) with ESMTP id w6P5pYur120857; Wed, 25 Jul 2018 00:51:34 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1532497894; bh=LbvYNADZP+exWg3FyOeOKhToIJGavSjBb9q/TnHICuE=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=GXq42lMrQzCOIyZQsdwrox8w09naNNbLkL9dlzbMy13fFqEAOPJpFFv65EnPe1FUP jU0GhwcDpMIkLjTdwuJrX4x3eBysxmoRi8Ay6OoR68C4/KxZIyw8j89iCZNuMlFLwL PjAd4+ywchGoywsAXTbCAXp/qrPrmHac12/kBA+g= Received: from DFLE106.ent.ti.com (dfle106.ent.ti.com [10.64.6.27]) by dflxv15.itg.ti.com (8.14.3/8.13.8) with ESMTP id w6P5pYLU027159; Wed, 25 Jul 2018 00:51:34 -0500 Received: from DFLE110.ent.ti.com (10.64.6.31) by DFLE106.ent.ti.com (10.64.6.27) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1466.3; Wed, 25 Jul 2018 00:51:33 -0500 Received: from dflp33.itg.ti.com (10.64.6.16) by DFLE110.ent.ti.com (10.64.6.31) with Microsoft SMTP Server (version=TLS1_0, cipher=TLS_RSA_WITH_AES_256_CBC_SHA) id 15.1.1466.3 via Frontend Transport; Wed, 25 Jul 2018 00:51:33 -0500 Received: from ula0393675.india.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by dflp33.itg.ti.com (8.14.3/8.13.8) with ESMTP id w6P5pSXi024328; Wed, 25 Jul 2018 00:51:31 -0500 From: Keerthy To: , CC: , , , , , Subject: [PATCH v5 2/2] rtc: omap: Cut down the shutdown time from 2 seconds to 1 sec Date: Wed, 25 Jul 2018 11:21:22 +0530 Message-ID: <1532497882-8828-2-git-send-email-j-keerthy@ti.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1532497882-8828-1-git-send-email-j-keerthy@ti.com> References: <1532497882-8828-1-git-send-email-j-keerthy@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Cut down the shutdown time from 2 seconds to 1 sec. In case of roll over try again. Signed-off-by: Keerthy --- Changes in v5: * Added an additional check to see if ALARM2 status is not set before retrying. * Cleaned up comments * Also reduced mdelay to 1S lesser as per this commit drivers/rtc/rtc-omap.c | 28 ++++++++++++++++++---------- 1 file changed, 18 insertions(+), 10 deletions(-) diff --git a/drivers/rtc/rtc-omap.c b/drivers/rtc/rtc-omap.c index 44ff4cc..caa6da6 100644 --- a/drivers/rtc/rtc-omap.c +++ b/drivers/rtc/rtc-omap.c @@ -421,12 +421,6 @@ static int omap_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm) * The RTC can be used to control an external PMIC via the pmic_power_en pin, * which can be configured to transition to OFF on ALARM2 events. * - * Notes: - * The two-second alarm offset is the shortest offset possible as the alarm - * registers must be set before the next timer update and the offset - * calculation is too heavy for everything to be done within a single access - * period (~15 us). - * * Called with local interrupts disabled. */ static void omap_rtc_power_off(void) @@ -435,17 +429,20 @@ static void omap_rtc_power_off(void) struct rtc_time tm; unsigned long now; u32 val; + int seconds; rtc->type->unlock(rtc); /* enable pmic_power_en control */ val = rtc_readl(rtc, OMAP_RTC_PMIC_REG); rtc_writel(rtc, OMAP_RTC_PMIC_REG, val | OMAP_RTC_PMIC_POWER_EN_EN); - /* set alarm two seconds from now */ +again: + /* set alarm one second from now */ omap_rtc_read_time_raw(rtc, &tm); + seconds = tm.tm_sec; bcd2tm(&tm); rtc_tm_to_time(&tm, &now); - rtc_time_to_tm(now + 2, &tm); + rtc_time_to_tm(now + 1, &tm); if (tm2bcd(&tm) < 0) { dev_err(&rtc->rtc->dev, "power off failed\n"); @@ -470,14 +467,25 @@ static void omap_rtc_power_off(void) val = rtc_read(rtc, OMAP_RTC_INTERRUPTS_REG); rtc_writel(rtc, OMAP_RTC_INTERRUPTS_REG, val | OMAP_RTC_INTERRUPTS_IT_ALARM2); + + /* + * first check if ALARM2 has fired, if not then check if + * our calculations started right before the rollover, try again + * in case of rollover + */ + if (!(OMAP_RTC_STATUS_ALARM2 && rtc_read(omap_rtc_power_off_rtc, + OMAP_RTC_STATUS_REG)) && + seconds != rtc_read(omap_rtc_power_off_rtc, OMAP_RTC_SECONDS_REG)) + goto again; + rtc->type->lock(rtc); /* - * Wait for alarm to trigger (within two seconds) and external PMIC to + * Wait for alarm to trigger (within one second) and external PMIC to * power off the system. Add a 500 ms margin for external latencies * (e.g. debounce circuits). */ - mdelay(2500); + mdelay(1500); } static const struct rtc_class_ops omap_rtc_ops = {