From patchwork Thu Apr 23 20:40:11 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lee Jones X-Patchwork-Id: 226975 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8C2B1C55191 for ; Thu, 23 Apr 2020 20:40:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5EE8F2073A for ; Thu, 23 Apr 2020 20:40:36 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="cbT+j4Eo" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726572AbgDWUkf (ORCPT ); Thu, 23 Apr 2020 16:40:35 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45624 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726183AbgDWUkf (ORCPT ); Thu, 23 Apr 2020 16:40:35 -0400 Received: from mail-wr1-x444.google.com (mail-wr1-x444.google.com [IPv6:2a00:1450:4864:20::444]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 55994C09B042 for ; Thu, 23 Apr 2020 13:40:35 -0700 (PDT) Received: by mail-wr1-x444.google.com with SMTP id j1so8247868wrt.1 for ; Thu, 23 Apr 2020 13:40:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=S0aruERS6sfoWL0NP6GQHXbCNqWez73bZgk7AnMorZI=; b=cbT+j4EogdVvIDwApO617ClMrE0gK4OjD6TtBEyH6NOuzv+8Um+GRr6K7txdnefJgr VZbW+wFRs1ugxl7IoTxm9AyQBjh13UCQkinyzRaohON1UGb1Ur5kqeBFbBQmJwMzWlEb 9vqIUJtusWhmKTnPbo4BRP1kapddfhRCzDtsB2rYu9QQp56FdWuC4NrOgp5Gy1nVhLcj v4Pgdo//bn7xmwaOIWzhKJgySkifVbMHCwPu7SknH0aBIbHL/w6lIv+6T/XFi2koDWfx TfcWy6Fi/AYQKw9VVLoQ6W26ByJUzo4LspP1Lrd465YN0uV5DFWUaJHvh5RZ/vxBB2d8 wbxQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=S0aruERS6sfoWL0NP6GQHXbCNqWez73bZgk7AnMorZI=; b=l3Cs3Yfr4B2NhgYVokuADT0tS255lAq1Sor3z/DRnW0Vr4vVaZgTTny+oTywVkAi7F tVHCUhdBycaeP4O26vNjTp0BeiekZocXpnOwiJrqr/T0nh4qPL2guWdgipdLIFlK2v5G nsqJle3QdBnrtNsIHSHUZ1w6brNDu8mgkdtITJ+MtwGHiYzlUnGf9F3qPYDixIhxRHlt kx3etcfo/mt2c9rlg1eyU3sH15jkv2eeHj+LTlyADhteX5tfpTJgTzBWcimmwzvl+11Y xxs/s+FSLloxEY5YPvY6KRlGlHHJPZ7+STQDNoP8F6hu3a5lahKnrGfzY8h0eRJuMSyN 1yyw== X-Gm-Message-State: AGi0Puay5ZcocJnETRMDZYKH6OrLboQogxPu0ZvB0k9SPHhTPf9hghLd XaIlfMc3ctrMPFTqeTU+8h7jdfi4pxc= X-Google-Smtp-Source: APiQypLxwkvJykct0rLxI+zZ4xb4PTKh7DMv/jo+YOW58uwF1GNtJEcW+FD5b2JX0kaJI9weW7yM+A== X-Received: by 2002:adf:fc4f:: with SMTP id e15mr6967472wrs.415.1587674433774; Thu, 23 Apr 2020 13:40:33 -0700 (PDT) Received: from localhost.localdomain ([2.31.163.63]) by smtp.gmail.com with ESMTPSA id u17sm5933726wra.63.2020.04.23.13.40.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 23 Apr 2020 13:40:32 -0700 (PDT) From: Lee Jones To: stable@vger.kernel.org Cc: Mohit Aggarwal , Alexandre Belloni , Lee Jones Subject: [PATCH 4.4 13/16] rtc: pm8xxx: Fix issue in RTC write path Date: Thu, 23 Apr 2020 21:40:11 +0100 Message-Id: <20200423204014.784944-14-lee.jones@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200423204014.784944-1-lee.jones@linaro.org> References: <20200423204014.784944-1-lee.jones@linaro.org> MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Mohit Aggarwal [ Upstream commit 83220bf38b77a830f8e62ab1a0d0408304f9b966 ] In order to set time in rtc, need to disable rtc hw before writing into rtc registers. Also fixes disabling of alarm while setting rtc time. Signed-off-by: Mohit Aggarwal Signed-off-by: Alexandre Belloni Signed-off-by: Lee Jones --- drivers/rtc/rtc-pm8xxx.c | 49 +++++++++++++++++++++++++++++++--------- 1 file changed, 38 insertions(+), 11 deletions(-) diff --git a/drivers/rtc/rtc-pm8xxx.c b/drivers/rtc/rtc-pm8xxx.c index a0dae6271ff64..cd4434cca877c 100644 --- a/drivers/rtc/rtc-pm8xxx.c +++ b/drivers/rtc/rtc-pm8xxx.c @@ -74,16 +74,18 @@ struct pm8xxx_rtc { /* * Steps to write the RTC registers. * 1. Disable alarm if enabled. - * 2. Write 0x00 to LSB. - * 3. Write Byte[1], Byte[2], Byte[3] then Byte[0]. - * 4. Enable alarm if disabled in step 1. + * 2. Disable rtc if enabled. + * 3. Write 0x00 to LSB. + * 4. Write Byte[1], Byte[2], Byte[3] then Byte[0]. + * 5. Enable rtc if disabled in step 2. + * 6. Enable alarm if disabled in step 1. */ static int pm8xxx_rtc_set_time(struct device *dev, struct rtc_time *tm) { int rc, i; unsigned long secs, irq_flags; - u8 value[NUM_8_BIT_RTC_REGS], alarm_enabled = 0; - unsigned int ctrl_reg; + u8 value[NUM_8_BIT_RTC_REGS], alarm_enabled = 0, rtc_disabled = 0; + unsigned int ctrl_reg, rtc_ctrl_reg; struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev); const struct pm8xxx_rtc_regs *regs = rtc_dd->regs; @@ -92,23 +94,38 @@ static int pm8xxx_rtc_set_time(struct device *dev, struct rtc_time *tm) rtc_tm_to_time(tm, &secs); + dev_dbg(dev, "Seconds value to be written to RTC = %lu\n", secs); + for (i = 0; i < NUM_8_BIT_RTC_REGS; i++) { value[i] = secs & 0xFF; secs >>= 8; } - dev_dbg(dev, "Seconds value to be written to RTC = %lu\n", secs); - spin_lock_irqsave(&rtc_dd->ctrl_reg_lock, irq_flags); - rc = regmap_read(rtc_dd->regmap, regs->ctrl, &ctrl_reg); + rc = regmap_read(rtc_dd->regmap, regs->alarm_ctrl, &ctrl_reg); if (rc) goto rtc_rw_fail; if (ctrl_reg & regs->alarm_en) { alarm_enabled = 1; ctrl_reg &= ~regs->alarm_en; - rc = regmap_write(rtc_dd->regmap, regs->ctrl, ctrl_reg); + rc = regmap_write(rtc_dd->regmap, regs->alarm_ctrl, ctrl_reg); + if (rc) { + dev_err(dev, "Write to RTC Alarm control register failed\n"); + goto rtc_rw_fail; + } + } + + /* Disable RTC H/w before writing on RTC register */ + rc = regmap_read(rtc_dd->regmap, regs->ctrl, &rtc_ctrl_reg); + if (rc) + goto rtc_rw_fail; + + if (rtc_ctrl_reg & PM8xxx_RTC_ENABLE) { + rtc_disabled = 1; + rtc_ctrl_reg &= ~PM8xxx_RTC_ENABLE; + rc = regmap_write(rtc_dd->regmap, regs->ctrl, rtc_ctrl_reg); if (rc) { dev_err(dev, "Write to RTC control register failed\n"); goto rtc_rw_fail; @@ -137,11 +154,21 @@ static int pm8xxx_rtc_set_time(struct device *dev, struct rtc_time *tm) goto rtc_rw_fail; } + /* Enable RTC H/w after writing on RTC register */ + if (rtc_disabled) { + rtc_ctrl_reg |= PM8xxx_RTC_ENABLE; + rc = regmap_write(rtc_dd->regmap, regs->ctrl, rtc_ctrl_reg); + if (rc) { + dev_err(dev, "Write to RTC control register failed\n"); + goto rtc_rw_fail; + } + } + if (alarm_enabled) { ctrl_reg |= regs->alarm_en; - rc = regmap_write(rtc_dd->regmap, regs->ctrl, ctrl_reg); + rc = regmap_write(rtc_dd->regmap, regs->alarm_ctrl, ctrl_reg); if (rc) { - dev_err(dev, "Write to RTC control register failed\n"); + dev_err(dev, "Write to RTC Alarm control register failed\n"); goto rtc_rw_fail; } }