From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 1215F50391D; Tue, 13 Oct 2026 12:03:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791892994; cv=none; b=Ziw49e/qD8KTEvtW6YdS+N7jwbSxliFWKdx48v3hIiL0a7/e5WyWZcCk+klTIk+dmv/XJ2ss7bioqRUnM21rmb9XKq1RDpncCDT0eddW6pHg7pZ6ift4My9uTm90Ov4VivDpD8098yMdKvg9aHNLaPWu2qPw5k1vbbuXh3XbMfw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791892994; c=relaxed/simple; bh=R7lZKT9pR98hse/GhhP15I6fAl4RZ4E9mK5EwIqmyX8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=jh/uV0J5bcCyTA2JxpPGN1/blaHkicrXrXnFsju6VR4hW7/7rnzc1isT5ORByIX3IWCumv3A68SRuyz5VvSRMSpR768Sd6tcPkgQTfd+gedDvA0dOgH67pcnQx5CphL12pAJFa1gOKNWrvpsvQa1fv9QgIpLfHxCSDOaOuCdCyM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=RYUM2mom; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="RYUM2mom" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 909661F000FF; Tue, 13 Oct 2026 12:03:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1791892992; bh=9oKhXpkQe0GmKvW80E+9rV+hgYHqw9cYRKNKHgKdXww=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=RYUM2momJsQxMvALHzlosL4QFnkhKokL1STVrIuqhWLd3SFuQAZwRYQB9+CKPyVti YiYcQ/Zk8r9y1Q0rVCRhmHK+wKgyXZaJzlob3yIfSvp/dt7bVdHcHrl9GTxoFrfAqc QVzwF/7LE2psuj04J08fhMHj7/sujacV2WbSnBqYPrnxl39NRPfHmp1M4KSbgNzxIB m7WCNd7Ii1KjL3sxn4uxB9dfJivqQld/wFkFNDXJcdZzL0/0f4tZQxmZER6I7Wh5zD DiV1aVRxKQ1OV+bWXcHXbY8r51BVgrjUq5JoTkUfFy8LAdf4dcxSnywpQDB+UMVzUX Iv5u19LYH7NHQ== From: Imre Kaloz To: Alexandre Belloni Cc: Joshua Kinard , linux-rtc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 1/3] rtc: ds1685: arm the wake-up alarm at power-off only if an alarm is set Date: Tue, 13 Oct 2026 14:02:06 +0200 Message-ID: <20261013120208.11268-2-kaloz@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20261013120208.11268-1-kaloz@kernel.org> References: <20261013120208.11268-1-kaloz@kernel.org> Precedence: bulk X-Mailing-List: linux-rtc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit ds1685_rtc_poweroff() always sets WIE. The wake-up alarm then compares the time-of-day and date alarm registers, which hold whatever was last written to them, and a match powers the machine straight back on. Set WIE only when AIE is set in Control B, and clear it otherwise. Fixes: aaaf5fbf56f1 ("rtc: add driver for DS1685 family of real time clocks") Signed-off-by: Imre Kaloz --- drivers/rtc/rtc-ds1685.c | 18 ++++++++++++------ 1 file changed, 12 insertions(+), 6 deletions(-) diff --git a/drivers/rtc/rtc-ds1685.c b/drivers/rtc/rtc-ds1685.c index 5fc8e36b1abf..94c89333c5d5 100644 --- a/drivers/rtc/rtc-ds1685.c +++ b/drivers/rtc/rtc-ds1685.c @@ -1367,7 +1367,7 @@ module_platform_driver(ds1685_rtc_driver); void __noreturn ds1685_rtc_poweroff(struct platform_device *pdev) { - u8 ctrla, ctrl4a, ctrl4b; + u8 ctrla, ctrlb, ctrl4a, ctrl4b; struct ds1685_priv *rtc; /* Check for valid RTC data, else, spin forever. */ @@ -1394,6 +1394,8 @@ ds1685_rtc_poweroff(struct platform_device *pdev) ctrla &= ~(RTC_CTRL_A_DV2); rtc->write(rtc, RTC_CTRL_A, ctrla); + ctrlb = rtc->read(rtc, RTC_CTRL_B); + /* * Read Control 4A and check the status of the auxillary * battery. This must be present and working (VRT2 = 1) @@ -1408,13 +1410,17 @@ ds1685_rtc_poweroff(struct platform_device *pdev) /* * The auxillary battery is present and working. - * Enable extended functions (ABE=1), enable - * wake-up (WIE=1), and enable kickstart (KSE=1) - * in Control 4B. + * Enable extended functions (ABE=1) and kickstart + * (KSE=1) in Control 4B. Enable wake-up (WIE=1) only + * if an alarm is set, else stale alarm registers + * can power the system back on. */ ctrl4b = rtc->read(rtc, RTC_EXT_CTRL_4B); - ctrl4b |= (RTC_CTRL_4B_ABE | RTC_CTRL_4B_WIE | - RTC_CTRL_4B_KSE); + ctrl4b |= (RTC_CTRL_4B_ABE | RTC_CTRL_4B_KSE); + if (ctrlb & RTC_CTRL_B_AIE) + ctrl4b |= RTC_CTRL_4B_WIE; + else + ctrl4b &= ~(RTC_CTRL_4B_WIE); rtc->write(rtc, RTC_EXT_CTRL_4B, ctrl4b); } -- 2.47.3