From patchwork Mon Dec 9 17:00:02 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?b?TsOtY29sYXMgRi4gUi4gQS4gUHJhZG8=?= X-Patchwork-Id: 13900087 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 CE46AE77180 for ; Mon, 9 Dec 2024 17:02:50 +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:Cc:To:In-Reply-To:References :Message-Id:Content-Transfer-Encoding:Content-Type:MIME-Version:Subject:Date: From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=oo6qi32xliB1emk1pVOMd7Vf50zlJGgzdLuk8tsoDoU=; b=m6jr2sDZQDow56pdohudYm3tz9 ktftdnawpvr8LvdaezKBigsdPwQnbzN95BT5sWBQ96F7WXjqQAQ3lblc6iK9yVsT6hE7Or5lZdeVq /V7NAzZAb9YAyYhEWhpqIFU0PjmhaiixL1KtiCjllfyCrFX7pN5qsLlCN7GF+UDTtx3DSiJANxQOb gaCpSrIvgXypcAsF3vJZsDhgVpljhxHVy9v518WUQKnzTFbrHJpPhqnjR+5jlfio7wlfEE4KEc5l0 dib6jMXhxijFVugIEc8j7UrnpUlTSFy4DP2DBPBkRMQc6Nlp4EtMc6wJ/2zD5PK0Zwl4p0PGzPxni vEKJUD8w==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tKh9Y-00000008eI9-2bLL; Mon, 09 Dec 2024 17:02:36 +0000 Received: from bali.collaboradmins.com ([148.251.105.195]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tKh7W-00000008dba-29Bz; Mon, 09 Dec 2024 17:00:31 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1733763628; bh=mgTvb+hAc3cxs6nEMw1GnF2VZ+CANYXvQu+M3IdY9/g=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=LQQYN8soH/OC5ac9XKiI5FPJcjJxyYSnhmS0Rr8YfYhDkUaiGe3nYsof84vf0TINp gnaFc128Abf3bFPphaGf8+JYhqREzl+UguyJcPH+iHP+dK8X6pwoB6cr3YAzabvIBg xV+ZCpCzwhScCmvkMCntlNFSzug59VbGkcDMkHB5pqapt181SymqXdl/E57CPQ7Edv GHtm6tg/8x+fH5OScMko2txVzObzENN98RZMaxo1n+hMLnkjeJ7kHif7OY7SLmI2Mk WlUagobyYEMWc2UsSlTT/XwGZmM9Nq04q89ZtPhyYE0JVBx8hl6akkTnayYWkurQPj TTzXQRXnFL29Q== Received: from [192.168.0.47] (unknown [IPv6:2804:14c:1a9:53ee::1001]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: nfraprado) by bali.collaboradmins.com (Postfix) with ESMTPSA id 2916617E37C3; Mon, 9 Dec 2024 18:00:23 +0100 (CET) From: =?utf-8?b?TsOtY29sYXMgRi4gUi4gQS4gUHJhZG8=?= Date: Mon, 09 Dec 2024 14:00:02 -0300 Subject: [PATCH v2 1/5] thermal/drivers/mediatek/lvts: Disable monitor mode during suspend MIME-Version: 1.0 Message-Id: <20241209-mt8192-lvts-filtered-suspend-fix-v2-1-5b046a99baa9@collabora.com> References: <20241209-mt8192-lvts-filtered-suspend-fix-v2-0-5b046a99baa9@collabora.com> In-Reply-To: <20241209-mt8192-lvts-filtered-suspend-fix-v2-0-5b046a99baa9@collabora.com> To: "Rafael J. Wysocki" , Daniel Lezcano , Zhang Rui , Lukasz Luba , Matthias Brugger , AngeloGioacchino Del Regno , Alexandre Mergnat , Balsam CHIHI Cc: kernel@collabora.com, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, Hsin-Te Yuan , Chen-Yu Tsai , =?utf-8?q?Bernhard_Rosenkr=C3=A4nzer?= , "Rafael J. Wysocki" , =?utf-8?b?TsOtY29sYXMg?= =?utf-8?b?Ri4gUi4gQS4gUHJhZG8=?= , stable@vger.kernel.org X-Mailer: b4 0.14.2 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241209_090030_700964_27492AB2 X-CRM114-Status: GOOD ( 15.61 ) 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 When configured in filtered mode, the LVTS thermal controller will monitor the temperature from the sensors and trigger an interrupt once a thermal threshold is crossed. Currently this is true even during suspend and resume. The problem with that is that when enabling the internal clock of the LVTS controller in lvts_ctrl_set_enable() during resume, the temperature reading can glitch and appear much higher than the real one, resulting in a spurious interrupt getting generated. Disable the temperature monitoring and give some time for the signals to stabilize during suspend in order to prevent such spurious interrupts. Cc: stable@vger.kernel.org Reported-by: Hsin-Te Yuan Closes: https://lore.kernel.org/all/20241108-lvts-v1-1-eee339c6ca20@chromium.org/ Fixes: 8137bb90600d ("thermal/drivers/mediatek/lvts_thermal: Add suspend and resume") Reviewed-by: AngeloGioacchino Del Regno Signed-off-by: Nícolas F. R. A. Prado --- drivers/thermal/mediatek/lvts_thermal.c | 36 +++++++++++++++++++++++++++++++-- 1 file changed, 34 insertions(+), 2 deletions(-) diff --git a/drivers/thermal/mediatek/lvts_thermal.c b/drivers/thermal/mediatek/lvts_thermal.c index 07f7f3b7a2fb569cfc300dc2126ea426e161adff..a1a438ebad33c1fff8ca9781e12ef9e278eef785 100644 --- a/drivers/thermal/mediatek/lvts_thermal.c +++ b/drivers/thermal/mediatek/lvts_thermal.c @@ -860,6 +860,32 @@ static int lvts_ctrl_init(struct device *dev, struct lvts_domain *lvts_td, return 0; } +static void lvts_ctrl_monitor_enable(struct device *dev, struct lvts_ctrl *lvts_ctrl, bool enable) +{ + /* + * Bitmaps to enable each sensor on filtered mode in the MONCTL0 + * register. + */ + static const u8 sensor_filt_bitmap[] = { BIT(0), BIT(1), BIT(2), BIT(3) }; + u32 sensor_map = 0; + int i; + + if (lvts_ctrl->mode != LVTS_MSR_FILTERED_MODE) + return; + + if (enable) { + lvts_for_each_valid_sensor(i, lvts_ctrl) + sensor_map |= sensor_filt_bitmap[i]; + } + + /* + * Bits: + * 9: Single point access flow + * 0-3: Enable sensing point 0-3 + */ + writel(sensor_map | BIT(9), LVTS_MONCTL0(lvts_ctrl->base)); +} + /* * At this point the configuration register is the only place in the * driver where we write multiple values. Per hardware constraint, @@ -1381,8 +1407,11 @@ static int lvts_suspend(struct device *dev) lvts_td = dev_get_drvdata(dev); - for (i = 0; i < lvts_td->num_lvts_ctrl; i++) + for (i = 0; i < lvts_td->num_lvts_ctrl; i++) { + lvts_ctrl_monitor_enable(dev, &lvts_td->lvts_ctrl[i], false); + usleep_range(100, 200); lvts_ctrl_set_enable(&lvts_td->lvts_ctrl[i], false); + } clk_disable_unprepare(lvts_td->clk); @@ -1400,8 +1429,11 @@ static int lvts_resume(struct device *dev) if (ret) return ret; - for (i = 0; i < lvts_td->num_lvts_ctrl; i++) + for (i = 0; i < lvts_td->num_lvts_ctrl; i++) { lvts_ctrl_set_enable(&lvts_td->lvts_ctrl[i], true); + usleep_range(100, 200); + lvts_ctrl_monitor_enable(dev, &lvts_td->lvts_ctrl[i], true); + } return 0; }