From nobody Mon Jun 8 21:59:58 2026 Received: from mailgw02.mediatek.com (unknown [210.61.82.184]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3FE3C3CBE74 for ; Tue, 26 May 2026 07:42:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=210.61.82.184 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779781350; cv=none; b=WbM+bjnlf54TxHewZVfTApVo1q8CnJu7MZhi5H+vgS0+CH0ca+YK+rFNUdvFoy2a3z4a/1pAk4N66UwAX+Ewu0KVwJAR25tX1iCYHHiK3n1pWllBopBWqHrOvq+WbuXLJfevqgKm7muDLo2On4U0SRdxZW8x4U688htM3N2K71o= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779781350; c=relaxed/simple; bh=DqH7YJ/FiZe6TYLxpIqzqqiyptXI1OPizoxhyXVfTIc=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=UJCIbtmRbjZrvJ+3iILpg7xgHmEdtHFpUCh1nsnwFzdImpubyxW3eSaOlb1B3whIOuLsrsiI7tXlciE2YJ9+2n+Z4EfjB0Si6BmR8mLTuBjpOxdpImcVBPjYNB6fWGIdod/hDd/sX6/fWFwbI8NMnuvk0LS6/ozzg06rVVsFIBU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=mediatek.com; spf=pass smtp.mailfrom=mediatek.com; dkim=pass (1024-bit key) header.d=mediatek.com header.i=@mediatek.com header.b=D/u+T7oM; arc=none smtp.client-ip=210.61.82.184 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=mediatek.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=mediatek.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=mediatek.com header.i=@mediatek.com header.b="D/u+T7oM" X-UUID: 6d01418858d611f18dc8c9802ae25ab1-20260526 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Type:Content-Transfer-Encoding:MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:CC:To:From; bh=hGarAh8MikxAzw58e87667STsDgoTAJ6CHC+s/4LJmg=; b=D/u+T7oMohCMJrJI51uH00Q4MgePWrJwQAZVHNQ3oIaYwRjG2OF/3gqSfDddeqtmXAKiTwgUDi70krmoqILxBFiQ5aG0gcu14N7fynqqY6rgc8gnDhqc6zaUOl/0CCjEjch4/zV6ioSoL2NaH2bq5/7OdlVtnNW/wYeevcfaErU=; X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.3.15,REQID:37bf70e5-4590-4250-89cb-1311273df778,IP:0,U RL:0,TC:0,Content:0,EDM:0,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTION: release,TS:0 X-CID-META: VersionHash:e276073,CLOUDID:6f23ed02-95cb-4bf4-97e0-f571a61d29d5,B ulkID:nil,BulkQuantity:0,Recheck:0,SF:81|82|102|836|865|888|898,TC:-5,Cont ent:0|15|50,EDM:-3,IP:nil,URL:0,File:130,RT:0,Bulk:nil,QS:nil,BEC:-1,COL:0 ,OSI:0,OSA:0,AV:0,LES:1,SPR:NO,DKR:0,DKP:0,BRR:0,BRE:0,ARC:0 X-CID-BVR: 2,SSN|SDN X-CID-BAS: 2,SSN|SDN,0,_ X-CID-FACTOR: TF_CID_SPAM_SNR X-CID-RHF: D41D8CD98F00B204E9800998ECF8427E X-UUID: 6d01418858d611f18dc8c9802ae25ab1-20260526 Received: from mtkmbs13n2.mediatek.inc [(172.21.101.108)] by mailgw02.mediatek.com (envelope-from ) (Generic MTA with TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384 256/256) with ESMTP id 1316345057; Tue, 26 May 2026 15:42:20 +0800 Received: from mtkmbs11n2.mediatek.inc (172.21.101.187) by MTKMBS09N1.mediatek.inc (172.21.101.35) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.29; Tue, 26 May 2026 15:42:19 +0800 Received: from mediatek.com (10.233.130.16) by mtkmbs11n2.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.2562.29 via Frontend Transport; Tue, 26 May 2026 15:42:19 +0800 Received: by mediatek.com (Postfix, from userid 10034418) id 6ACD7200C5; Tue, 26 May 2026 15:42:19 +0800 (CST) From: Dhatrisri Anumula To: , CC: , , , , Shunxi Zhang , Dhatrisri Anumula Subject: [PATCH] rtc: mt6397: Add BBPU alarm status reset and shutdown handling Date: Tue, 26 May 2026 15:42:09 +0800 Message-ID: <20260526074210.1969655-2-dhatrisri.anumula@mediatek.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20260526074210.1969655-1-dhatrisri.anumula@mediatek.com> References: <20260526074210.1969655-1-dhatrisri.anumula@mediatek.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Shunxi Zhang This patch introduces a new function, mtk_rtc_reset_bbpu_alarm_status, to reset the BBPU alarm status in the MT6397 RTC driver. This function writes the necessary bits to the RTC_BBPU register to clear the alarm status and ensure proper operation. Additionally, the mtk_rtc_shutdown function is added to handle RTC shutdown events. It resets the BBPU alarm status and updates the RTC_IRQ_EN register to disable the one-shot alarm interrupt, ensuring a clean shutdown process. Signed-off-by: Shunxi Zhang Signed-off-by: Dhatrisri Anumula --- diff --git a/drivers/rtc/rtc-mt6397.c b/drivers/rtc/rtc-mt6397.c index 692c00f..063bd39 100644 --- a/drivers/rtc/rtc-mt6397.c +++ b/drivers/rtc/rtc-mt6397.c @@ -37,6 +37,21 @@ static int mtk_rtc_write_trigger(struct mt6397_rtc *rtc) return ret; } =20 +static void mtk_rtc_reset_bbpu_alarm_status(struct mt6397_rtc *rtc) +{ + u32 bbpu =3D RTC_BBPU_KEY | RTC_BBPU_PWREN | RTC_BBPU_RESET_AL; + int ret; + + ret =3D regmap_write(rtc->regmap, rtc->addr_base + RTC_BBPU, bbpu); + if (ret < 0) { + dev_err(rtc->rtc_dev->dev.parent, "%s: write rtc bbpu error\n", + __func__); + return; + } + + mtk_rtc_write_trigger(rtc); +} + static irqreturn_t mtk_rtc_irq_handler_thread(int irq, void *data) { struct mt6397_rtc *rtc =3D data; @@ -51,6 +66,8 @@ static irqreturn_t mtk_rtc_irq_handler_thread(int irq, vo= id *data) if (regmap_write(rtc->regmap, rtc->addr_base + RTC_IRQ_EN, irqen) =3D=3D 0) mtk_rtc_write_trigger(rtc); + + mtk_rtc_reset_bbpu_alarm_status(rtc); mutex_unlock(&rtc->lock); =20 return IRQ_HANDLED; @@ -297,6 +314,22 @@ static int mtk_rtc_probe(struct platform_device *pdev) return devm_rtc_register_device(rtc->rtc_dev); } =20 +static void mtk_rtc_shutdown(struct platform_device *pdev) +{ + struct mt6397_rtc *rtc =3D platform_get_drvdata(pdev); + int ret =3D 0; + + mtk_rtc_reset_bbpu_alarm_status(rtc); + + ret =3D regmap_update_bits(rtc->regmap, + rtc->addr_base + RTC_IRQ_EN, + RTC_IRQ_EN_ONESHOT_AL, 0); + if (ret < 0) + return; + + mtk_rtc_write_trigger(rtc); +} + #ifdef CONFIG_PM_SLEEP static int mt6397_rtc_suspend(struct device *dev) { @@ -345,7 +378,8 @@ static struct platform_driver mtk_rtc_driver =3D { .of_match_table =3D mt6397_rtc_of_match, .pm =3D &mt6397_pm_ops, }, - .probe =3D mtk_rtc_probe, + .probe =3D mtk_rtc_probe, + .shutdown =3D mtk_rtc_shutdown, }; =20 module_platform_driver(mtk_rtc_driver);