From nobody Wed Dec 17 20:57:28 2025 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3129CC61D9B for ; Wed, 22 Nov 2023 17:25:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344231AbjKVRZx (ORCPT ); Wed, 22 Nov 2023 12:25:53 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45634 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344130AbjKVRZk (ORCPT ); Wed, 22 Nov 2023 12:25:40 -0500 Received: from mo4-p02-ob.smtp.rzone.de (mo4-p02-ob.smtp.rzone.de [85.215.255.82]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0B46E11F; Wed, 22 Nov 2023 09:25:35 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1700673929; cv=none; d=strato.com; s=strato-dkim-0002; b=L7WFrYebsKHoUGrR1I1AnrhXx43r66fniToUVGhpiG1yTxFPw0MYuimgZ4Squ+ClHW X6jaXfoOvLccEA/oPO7NiPwaVV/cJ80qq/UpscPLDc1IlAe9zIBFG/aC1kkwfdeLfcwP 9CyF5QB9eCvWUjzMzBLMsUxydr3U5uFPZT6qXgDjWA2qsyMHLE13WlbBUbRShP+hKIhm Ck/lh4Q7tCFI9T6uz2knWdtbkmpQ7J4LMwUBdqLoEeDoOx7QoH/oZxWew163cPPXa7Re 2mnOvwXvYaelgt/zrA20CcgEv5Y70IvdVF0kQi5xqq7uEAydvzvE6BQZ0Czjhq2T7g3U gtkQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; t=1700673929; s=strato-dkim-0002; d=strato.com; h=References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Cc:Date: From:Subject:Sender; bh=vZpZ9NKXUQd/HeAYhjZFf4m71jUoBcZvjlDIhfX51No=; b=jVtXAN2Ue+JUsFFZUDqooVnxp2YjrErfvxFChRTLqR7iJb0YNq2jCDWTL6qvhpgtUh pzIdllwANKd86jHjtdfbH66XyCVoo3OQVMDVWbqx71+Dht+xBXi2CEu3bwlWb2qUuddx vUcPdoN6fP527IB+Wea6sAow9hw+LzaoTwwZeMnnrt3tFKFIYreEcN0kCDT3vpqzDWwx IsL8PDMYlqFDaUc91yMIbx7cvJMKM0VLe2sByHsba6gAMga56u8tLvIg7axq6+r5OfuN +CwDI2NVHf0JK5po9e8nEBpme/GWAsKgxRBVqy8aT/GjRKgEpZGRr+G4UTc2+XKNbKVC hnMA== ARC-Authentication-Results: i=1; strato.com; arc=none; dkim=none X-RZG-CLASS-ID: mo02 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; t=1700673929; s=strato-dkim-0002; d=iokpp.de; h=References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Cc:Date: From:Subject:Sender; bh=vZpZ9NKXUQd/HeAYhjZFf4m71jUoBcZvjlDIhfX51No=; b=tmkqyx1ZPFvm9gGyfWwMoEofS1DdYUQaRl6LJQrjUxJqnjR/fB4ex76ZsOKGEgahoY hhNeiU8HVlaoLvpWKlvBEaBqeU6PmHHz94McXnE897Ri1Tjxzrij9V/9RI3el3bzBp3H zW1emX36yRhicdUZGdlo9NhoTfx7OTPlpoRNrt4Vtqdu9xO+keoArpY35sbYcQlp1Cg5 TzZP6nUr/I/uJZN9PL1vNcduPMbkAjOthzi263gw3GoxgBHYSQYf/Gn4oOHSltPP1HoE e6VAHgJk+KoKtYcdwnQvGxUg6sZ/mTJX6eRDZqpVNDmugVQmyS7C2bXYkb8dwUGeAfbz HyaA== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; t=1700673929; s=strato-dkim-0003; d=iokpp.de; h=References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Cc:Date: From:Subject:Sender; bh=vZpZ9NKXUQd/HeAYhjZFf4m71jUoBcZvjlDIhfX51No=; b=SkDr8bksm3TNE4WuBF4Cj5eiTXNfrzcq2TtVMVuzsZY6y9r4Zdqbd4YYy/WY7O1u76 JS96XsU21T6869eK70Ag== X-RZG-AUTH: ":LmkFe0i9dN8c2t4QQyGBB/NDXvjDB6pBSedrgBzPc9DUyubU4DD2QzemV2tdlNlNRZBXiUw=" Received: from Munilab01-lab.micron.com by smtp.strato.de (RZmta 49.9.1 AUTH) with ESMTPSA id z758a5zAMHPStqM (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256 bits)) (Client did not present a certificate); Wed, 22 Nov 2023 18:25:28 +0100 (CET) From: Bean Huo To: avri.altman@wdc.com, bvanassche@acm.org, alim.akhtar@samsung.com, jejb@linux.ibm.com, martin.petersen@oracle.com, mani@kernel.org, quic_cang@quicinc.com, quic_asutoshd@quicinc.com, beanhuo@micron.com, thomas@t-8ch.de Cc: linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, mikebi@micron.com, lporzio@micron.com Subject: [PATCH v2 3/3] scsi: ufs: core: Add sysfs node for UFS RTC update Date: Wed, 22 Nov 2023 18:25:12 +0100 Message-Id: <20231122172512.103748-4-beanhuo@iokpp.de> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231122172512.103748-1-beanhuo@iokpp.de> References: <20231122172512.103748-1-beanhuo@iokpp.de> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Bean Huo Introduce a sysfs node named 'rtc_update_ms' within the kernel, enabling us= er to adjust the RTC periodic update frequency to suit the specific requirements = of the system and UFS. Also, this patch allows the user to disable/enable periodic= update RTC in the UFS idle time. Signed-off-by: Bean Huo --- Documentation/ABI/testing/sysfs-driver-ufs | 7 +++++ drivers/ufs/core/ufs-sysfs.c | 31 ++++++++++++++++++++++ drivers/ufs/core/ufshcd.c | 11 ++++++-- include/ufs/ufs.h | 1 + 4 files changed, 48 insertions(+), 2 deletions(-) diff --git a/Documentation/ABI/testing/sysfs-driver-ufs b/Documentation/ABI= /testing/sysfs-driver-ufs index 0c7efaf62de0..ef1e27584fff 100644 --- a/Documentation/ABI/testing/sysfs-driver-ufs +++ b/Documentation/ABI/testing/sysfs-driver-ufs @@ -1474,3 +1474,10 @@ Description: Indicates status of Write Booster. =20 The file is read only. =20 +What: /sys/bus/platform/drivers/ufshcd/*/rtc_update_ms +What: /sys/bus/platform/devices/*.ufs/rtc_update_ms +Date: November 2023 +Contact: Bean Huo +Description: + rtc_update_ms indicates how often the host should synchronize or update = the + UFS RTC. If set to 0, this will disable UFS RTC periodic update. diff --git a/drivers/ufs/core/ufs-sysfs.c b/drivers/ufs/core/ufs-sysfs.c index c95906443d5f..bb6b540ccd8e 100644 --- a/drivers/ufs/core/ufs-sysfs.c +++ b/drivers/ufs/core/ufs-sysfs.c @@ -255,6 +255,35 @@ static ssize_t wb_on_store(struct device *dev, struct = device_attribute *attr, return res < 0 ? res : count; } =20 +static ssize_t rtc_update_ms_show(struct device *dev, struct device_attrib= ute *attr, + char *buf) +{ + struct ufs_hba *hba =3D dev_get_drvdata(dev); + + return sysfs_emit(buf, "%d\n", hba->dev_info.rtc_update_period); +} + +static ssize_t rtc_update_ms_store(struct device *dev, struct device_attri= bute *attr, + const char *buf, size_t count) +{ + struct ufs_hba *hba =3D dev_get_drvdata(dev); + unsigned int ms; + bool resume_period_update =3D false; + + if (kstrtouint(buf, 0, &ms)) + return -EINVAL; + + if (!hba->dev_info.rtc_update_period && ms > 0) + resume_period_update =3D true; + /* Minimum and maximum update frequency should be synchronized with all U= FS vendors */ + hba->dev_info.rtc_update_period =3D ms; + + if (resume_period_update) + schedule_delayed_work(&hba->ufs_rtc_update_work, + msecs_to_jiffies(hba->dev_info.rtc_update_period)); + return count; +} + static ssize_t enable_wb_buf_flush_show(struct device *dev, struct device_attribute *attr, char *buf) @@ -339,6 +368,7 @@ static DEVICE_ATTR_RW(auto_hibern8); static DEVICE_ATTR_RW(wb_on); static DEVICE_ATTR_RW(enable_wb_buf_flush); static DEVICE_ATTR_RW(wb_flush_threshold); +static DEVICE_ATTR_RW(rtc_update_ms); =20 static struct attribute *ufs_sysfs_ufshcd_attrs[] =3D { &dev_attr_rpm_lvl.attr, @@ -351,6 +381,7 @@ static struct attribute *ufs_sysfs_ufshcd_attrs[] =3D { &dev_attr_wb_on.attr, &dev_attr_enable_wb_buf_flush.attr, &dev_attr_wb_flush_threshold.attr, + &dev_attr_rtc_update_ms.attr, NULL }; =20 diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c index 4d349eff24c4..53b4c96f4279 100644 --- a/drivers/ufs/core/ufshcd.c +++ b/drivers/ufs/core/ufshcd.c @@ -8223,9 +8223,9 @@ static void ufshcd_rtc_work(struct work_struct *work) if (!is_busy) ufshcd_update_rtc(hba); =20 - if (ufshcd_is_ufs_dev_active(hba)) + if (ufshcd_is_ufs_dev_active(hba) && hba->dev_info.rtc_update_period) schedule_delayed_work(&hba->ufs_rtc_update_work, - msecs_to_jiffies(UFS_RTC_UPDATE_INTERVAL_MS)); + msecs_to_jiffies(hba->dev_info.rtc_update_period)); } =20 static void ufs_init_rtc(struct ufs_hba *hba, u8 *desc_buf) @@ -8247,6 +8247,13 @@ static void ufs_init_rtc(struct ufs_hba *hba, u8 *d= esc_buf) dev_info->rtc_time_baseline =3D 0; } =20 + /* + * We ignore TIME_PERIOD defined in wPeriodicRTCUpdate because Spec does = not clearly state + * how to calculate the specific update period for each time unit. Here w= e disable periodic + * update work, and let user configure by sysfs node according to specifi= c circumstance. + */ + hba->dev_info.rtc_update_period =3D 0; + INIT_DELAYED_WORK(&hba->ufs_rtc_update_work, ufshcd_rtc_work); } =20 diff --git a/include/ufs/ufs.h b/include/ufs/ufs.h index 8022d267fe8a..288724d3be90 100644 --- a/include/ufs/ufs.h +++ b/include/ufs/ufs.h @@ -592,6 +592,7 @@ struct ufs_dev_info { /* UFS RTC */ enum ufs_rtc_time rtc_type; time64_t rtc_time_baseline; + u32 rtc_update_period; }; =20 /* --=20 2.34.1