From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:60836 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755242AbdCJIeP (ORCPT ); Fri, 10 Mar 2017 03:34:15 -0500 Subject: Patch "rtc: sun6i: Switch to the external oscillator" has been added to the 4.4-stable tree To: maxime.ripard@free-electrons.com, alexandre.belloni@free-electrons.com, gregkh@linuxfoundation.org Cc: , From: Date: Fri, 10 Mar 2017 09:33:22 +0100 Message-ID: <148913480222154@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled rtc: sun6i: Switch to the external oscillator to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: rtc-sun6i-switch-to-the-external-oscillator.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From fb61bb82cb46a932ef2fc62e1c731c8e7e6640d5 Mon Sep 17 00:00:00 2001 From: Maxime Ripard Date: Mon, 23 Jan 2017 11:41:48 +0100 Subject: rtc: sun6i: Switch to the external oscillator From: Maxime Ripard commit fb61bb82cb46a932ef2fc62e1c731c8e7e6640d5 upstream. The RTC is clocked from either an internal, imprecise, oscillator or an external one, which is usually much more accurate. The difference perceived between the time elapsed and the time reported by the RTC is in a 10% scale, which prevents the RTC from being useful at all. Fortunately, the external oscillator is reported to be mandatory in the Allwinner datasheet, so we can just switch to it. Fixes: 9765d2d94309 ("rtc: sun6i: Add sun6i RTC driver") Signed-off-by: Maxime Ripard Signed-off-by: Alexandre Belloni Signed-off-by: Greg Kroah-Hartman --- drivers/rtc/rtc-sun6i.c | 6 ++++++ 1 file changed, 6 insertions(+) --- a/drivers/rtc/rtc-sun6i.c +++ b/drivers/rtc/rtc-sun6i.c @@ -37,9 +37,11 @@ /* Control register */ #define SUN6I_LOSC_CTRL 0x0000 +#define SUN6I_LOSC_CTRL_KEY (0x16aa << 16) #define SUN6I_LOSC_CTRL_ALM_DHMS_ACC BIT(9) #define SUN6I_LOSC_CTRL_RTC_HMS_ACC BIT(8) #define SUN6I_LOSC_CTRL_RTC_YMD_ACC BIT(7) +#define SUN6I_LOSC_CTRL_EXT_OSC BIT(0) #define SUN6I_LOSC_CTRL_ACC_MASK GENMASK(9, 7) /* RTC */ @@ -417,6 +419,10 @@ static int sun6i_rtc_probe(struct platfo /* disable alarm wakeup */ writel(0, chip->base + SUN6I_ALARM_CONFIG); + /* switch to the external, more precise, oscillator */ + writel(SUN6I_LOSC_CTRL_KEY | SUN6I_LOSC_CTRL_EXT_OSC, + chip->base + SUN6I_LOSC_CTRL); + chip->rtc = rtc_device_register("rtc-sun6i", &pdev->dev, &sun6i_rtc_ops, THIS_MODULE); if (IS_ERR(chip->rtc)) { Patches currently in stable-queue which might be from maxime.ripard@free-electrons.com are queue-4.4/rtc-sun6i-add-some-locking.patch queue-4.4/rtc-sun6i-switch-to-the-external-oscillator.patch