From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mailout2.samsung.com ([203.254.224.25]:54163 "EHLO mailout2.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751440AbbHQBsG (ORCPT ); Sun, 16 Aug 2015 21:48:06 -0400 Message-id: <55D13D53.3060902@samsung.com> Date: Mon, 17 Aug 2015 10:48:03 +0900 From: Joonyoung Shim MIME-version: 1.0 To: Krzysztof Kozlowski , rtc-linux@googlegroups.com Cc: linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, a.zummo@towertech.it, alexandre.belloni@free-electrons.com, sbkim73@samsung.com Subject: Re: [rtc-linux] [PATCH] rtc: s5m: fix to update ctrl register References: <1439455764-23526-1-git-send-email-jy0922.shim@samsung.com> <55CC6B28.5010707@samsung.com> <55CC7479.6080902@samsung.com> In-reply-to: <55CC7479.6080902@samsung.com> Content-type: text/plain; charset=utf-8 Content-transfer-encoding: 7bit Sender: stable-owner@vger.kernel.org List-ID: On 08/13/2015 07:42 PM, Krzysztof Kozlowski wrote: > W dniu 13.08.2015 o 19:02, Krzysztof Kozlowski pisze: >> W dniu 13.08.2015 o 17:49, Joonyoung Shim pisze: >>> According to datasheet, the S2MPS13X and S2MPS14X should update write >>> buffer via setting WUDR bit to high after ctrl register is updated. >> >> Hi, >> >> I cannot find this information in S2MPS14 datasheet. On which page is it? >> >> >>> >>> If not, ALARM interrupt of rtc-s5m doesn't happen first time when i use >>> tools/testing/selftests/timers/rtctest.c test program and hour format is >>> used to 12 hour mode in Odroid-XU3 board. >> >> Two questions here: >> 1. Earlier you mentioned S2MPS1[34], now Odroid XU3 which has S2MPS11. >> Are you sure that this applies to all of them (S2MPS11, S2MPS13 and >> S2MP14)? There are some minor differences between them so I would not be >> surprised if only some of them required this action. >> >> 2. The driver operates in 24-hour omode. Actually it sets the 24-hour >> mode just before your new regmap_update_bits() call. What do you mean by >> 12-hour mode? >> >>> Signed-off-by: Joonyoung Shim >>> Cc: >> >> Thanks for putting a cc-stable tag. How far this should be ported? If >> this is needed only for S2MPS11 then v4.1. If all of them then probably >> for earlier version? >> >> Best regards, >> Krzysztof > > One more doubt. On my Odroid XU3 first and consecutive executions > (including first) of rtctest run fine. They pass. Can you describe > exactly observable issue and how to reproduce it? This is also important > as a reason for stable backport. I just tested it on next-20150810 with Odroid-XU3 board. First rtctest execution is blocked, # ./rtctest RTC Driver Test Example. Counting 5 update (1/sec) interrupts from reading /dev/rtc0: Any no progress. > > I tested it on next-20150729 on board with Hardkernel bootloader. Maybe > the bootloader sets 12-hour mode which cannot be switched to 24-hour? > My bootloader doesn't touch any registers of s5m-rtc. Thanks.