From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id EB021CD379F for ; Tue, 3 Sep 2024 17:37:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=ytJ7+V48kuNct1mxvlZovRxmCRiGxTsehGS1w1kVKnU=; b=NriRA22SPIbda3iq1jkHdZdsPc ECBPjBeDFRjcz+bTSKLGV+Q+7soEIOKX44CqyKC0EuApcTDIT0GOKId3ZA+i7UtD41X/Wn5ig1f1w i4ICD273Ijb1yXL7BF/uhATkT5Q1G0mFcDMBL6HqPVT7eqB6RxGYFXs9wMpCUSlFX4oC+szot2rB2 VVD66V6sQjkmIhmV5gPXv3gGOCtB5JiW9XwPqbR5Zb0VudMYpH51g9yy+E1Xt7OytucLCoHHdRoJG wN3Yki6y+dgwoBc+Li+R+fsey+yTsWzHLVG3BXOB5n5UhvZhkArdMjkubOrTpf4rjCtAAKEQHZnNP W65QjAZg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1slXSx-00000001Jyt-2p1W; Tue, 03 Sep 2024 17:37:19 +0000 Received: from relay9-d.mail.gandi.net ([2001:4b98:dc4:8::229]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1slXS0-00000001Jhq-038I for linux-arm-kernel@lists.infradead.org; Tue, 03 Sep 2024 17:36:23 +0000 Received: by mail.gandi.net (Postfix) with ESMTPSA id EDF88FF805; Tue, 3 Sep 2024 17:36:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1725384977; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=ytJ7+V48kuNct1mxvlZovRxmCRiGxTsehGS1w1kVKnU=; b=HSGMd4Op5cYNUkfA1pUTtZUAhOuhh3jWsCrDdxEReBGxCmtwV8Ct7ij5nzTtEzcsCIzK4R C/IQ//w0N8J2KF8G3RXGmLt5P87hAP9qEtTWvctiGQ92BgiPJAmj8MPzGGa+E8sPFi7YZT H+UGW6ZdzyyBzkKJdtixOtYePtblEt4P9RhVUinwkcdmPBn2oo3CQZ41q9NckP+5RjOuDj c7JfnHqIfsE7GpNHAeN3e0GHAzkIxoeuftDWj/5FO0AYroqrWQw9KPaP9lYK+NerAUqwfc 3EhP4f+goxzbZeCmBHW4szl8LrmH4/KZYoGrxPN1LoPHRBxu3aWvM/UNS9LZLg== Date: Tue, 3 Sep 2024 19:36:15 +0200 From: Alexandre Belloni To: claudiu beznea Cc: geert+renesas@glider.be, mturquette@baylibre.com, sboyd@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, magnus.damm@gmail.com, p.zabel@pengutronix.de, linux-renesas-soc@vger.kernel.org, linux-clk@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-rtc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Claudiu Beznea , kernel test robot Subject: Re: [PATCH v3 06/12] rtc: renesas-rtca3: Add driver for RTCA-3 available on Renesas RZ/G3S SoC Message-ID: <20240903173615b69cfd0d@mail.local> References: <20240830130218.3377060-1-claudiu.beznea.uj@bp.renesas.com> <20240830130218.3377060-7-claudiu.beznea.uj@bp.renesas.com> <202408302225417622f1e7@mail.local> <2e49b73c-c645-446c-8606-7a531e0a74f8@tuxon.dev> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <2e49b73c-c645-446c-8606-7a531e0a74f8@tuxon.dev> X-GND-Sasl: alexandre.belloni@bootlin.com X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240903_103620_672708_ECBC08B7 X-CRM114-Status: GOOD ( 36.83 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 03/09/2024 19:09:00+0300, claudiu beznea wrote: > > > > Also, w/o this change the RTC remains blocked under the following scenarios > > if the interrupts are not disabled in remove: > > This intrigued me and did some further investigation. I found that > something is wrong on the driver as described bellow. > > The failures described in the previous emails were due to the fact that the > RTC counter clock was requested by the driver as devres managed resource. > This is the clock that feeds the RTC counting logic. > > With the bellow diff applied on top of this series scenarios 1/ and 2/ > described in the previous email works just fine. > > For scenario 3/ the system is not powered up (as expected) but there are no > more failures on the next boots. > > diff --git a/drivers/rtc/rtc-renesas-rtca3.c b/drivers/rtc/rtc-renesas-rtca3.c > index f908d2a1017d..c9adcadc58c0 100644 > --- a/drivers/rtc/rtc-renesas-rtca3.c > +++ b/drivers/rtc/rtc-renesas-rtca3.c > @@ -747,10 +747,14 @@ static int rtca3_probe(struct platform_device *pdev) > if (ret) > return ret; > > - clk = devm_clk_get_enabled(dev, "counter"); > + clk = devm_clk_get(dev, "counter"); > if (IS_ERR(clk)) > return PTR_ERR(clk); > > + ret = clk_prepare_enable(clk); > + if (ret) > + return ret; > + > spin_lock_init(&priv->lock); > atomic_set(&priv->alrm_sstep, RTCA3_ALRM_SSTEP_DONE); > init_completion(&priv->set_alarm_completion); > @@ -783,7 +787,7 @@ static void rtca3_remove(struct platform_device *pdev) > > guard(spinlock_irqsave)(&priv->lock); > > - rtca3_alarm_irq_set_helper(priv, RTCA3_RCR1_AIE | RTCA3_RCR1_PIE, 0); > + //rtca3_alarm_irq_set_helper(priv, RTCA3_RCR1_AIE | RTCA3_RCR1_PIE, 0); > } > > Question is: the RTC counter clock should stay on when the driver is > unbinded, right? Yes, the lifecycle of the RTC and its ressources is longer than the system's as the whole point is to keep the time and date running while the system is off. > > Thank you, > Claudiu Beznea > > > > > 1/ Configure wake alarm and unbind the RTC driver with the following commands: > > # echo +10 > /sys/class/rtc/rtc0/wakealarm > > # echo /sys/bus/platform/drivers/rtc-rtca3/1004ec00.rtc > unbind > > # sleep 12 > > # echo /sys/bus/platform/drivers/rtc-rtca3/1004ec00.rtc > bind > > > > When rebinding the re-configuration of the RTC device times out: > > [ 121.854190] rtc-rtca3 1004ec00.rtc: error -ETIMEDOUT: Failed to setup > > the RTC! > > [ 121.861511] rtc-rtca3 1004ec00.rtc: probe with driver rtc-rtca3 failed > > with error -110 > > -sh: echo: write error: Connection timed out > > > > 2/ Configure wake alarm, unbind the RTC driver and switch to s2idle with > > the following commands: > > # echo s2idle > /sys/power/mem_sleep > > # echo +10 > /sys/class/rtc/rtc0/wakealarm > > # echo /sys/bus/platform/drivers/rtc-rtca/31004ec00.rtc > unbind > > # echo mem > /sys/power/state > > # #system is resumed by non RTC wakeup source (as the RTC alarm is not > > working anymore in this case) > > # echo /sys/bus/platform/drivers/rtc-rtca/1004ec00.rtc > bind > > > > The system is not waked up from RTC alarm (as expected) and the rebinding > > fails again: > > > > [ 172.483688] rtc-rtca3 1004ec00.rtc: error -ETIMEDOUT: Failed to setup > > the RTC! > > [ 172.491003] rtc-rtca3 1004ec00.rtc: probe with driver rtc-rtca3 failed > > with error -110 > > -sh: echo: write error: Connection timed out > > > > 3/ configure the RTC alarm, unbind and power off (with the following commands): > > # echo +60 > /sys/class/rtc/rtc0/wakealarm > > # echo /sys/bus/platform/drivers/rtc-rtca/1004ec00.rtc > unbind > > # poweroff > > > > The system is not started after 60 seconds and at the next reboot the RTC > > configuration on probe is failing the same: > > > > [ 0.292068] rtc-rtca3 1004ec00.rtc: error -ETIMEDOUT: Failed to setup > > the RTC! > > [ 0.292182] rtc-rtca3 1004ec00.rtc: probe with driver rtc-rtca3 failed > > with error -110 > > > > In all scenarios the RTC is recovered only if removing/re-applying the > > power to the SoC area where it resides. > > > > These tests were done with the patches in this series and then I tried it > > with the following diff on top of the patches in this series. The results > > were the same: > > > > diff --git a/drivers/rtc/rtc-renesas-rtca3.c b/drivers/rtc/rtc-renesas-rtca3.c > > index 822c055b6e4d..720fdac3adc6 100644 > > --- a/drivers/rtc/rtc-renesas-rtca3.c > > +++ b/drivers/rtc/rtc-renesas-rtca3.c > > @@ -586,7 +586,7 @@ static int rtca3_initial_setup(struct clk *clk, struct > > rtca3_priv *priv) > > usleep_range(sleep_us, sleep_us + 10); > > > > /* Disable alarm and carry interrupts. */ > > - mask = RTCA3_RCR1_AIE | RTCA3_RCR1_CIE; > > + mask = RTCA3_RCR1_AIE | RTCA3_RCR1_CIE | RTCA3_RCR1_PIE; > > ret = rtca3_alarm_irq_set_helper(priv, mask, 0); > > if (ret) > > return ret; > > @@ -784,7 +784,7 @@ static void rtca3_remove(struct platform_device *pdev) > > guard(spinlock_irqsave)(&priv->lock); > > > > /* Disable alarm, periodic interrupts. */ > > - rtca3_alarm_irq_set_helper(priv, RTCA3_RCR1_AIE | RTCA3_RCR1_PIE, 0); > > + //rtca3_alarm_irq_set_helper(priv, RTCA3_RCR1_AIE | RTCA3_RCR1_PIE, 0); > > } > > > > Thank you, > > Claudiu Beznea > > -- Alexandre Belloni, co-owner and COO, Bootlin Embedded Linux and Kernel engineering https://bootlin.com