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 889A9D35171 for ; Wed, 1 Apr 2026 11:14:59 +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:Content-Transfer-Encoding: Content-Type:MIME-Version:Message-ID:Date:Subject:Cc:To:From:Reply-To: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner; bh=93p9L3k+sUGmocfBSVzKGZHTWa/Pn999YBF5eBW86uY=; b=AcQzo5fIeKS3jCflxKyvzCiBw0 uzJPCFYV3uUcBuKJU025fuoIPIru4a81yknBzTyXWCr31RYGf220umvBksdGeepz8FTHDMApzk8ir ZxzyuEB5smEu/vyJ/VQjoPEtsVRcjBk9LpSCZrZkEwefo0y1qK2J8UKvwqq8qBuSQsX2/hCEw/0wZ LlgYh0WWLLenFLkalrjQJk08XyhoBimbbZvpP/jN7bPE/t2WRo/UXnsSFnqIsIjl9QqPiEoXaupPL TJRuCuYAdjXJUPs3o475V24Ud6kCcXqR4prBW2+Woo5fO3IjM7z1xVlsq9ibH4lOc8wT5psWku1b9 YcX43Vng==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1w7tXD-0000000Ebo7-2u0F; Wed, 01 Apr 2026 11:14:55 +0000 Received: from fanzine2.igalia.com ([213.97.179.56]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1w7tX9-0000000Ebm9-0yhq; Wed, 01 Apr 2026 11:14:53 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=igalia.com; s=20170329; h=Content-Transfer-Encoding:Content-Type:MIME-Version:Message-ID: Date:Subject:Cc:To:From:Sender:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: In-Reply-To:References:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=93p9L3k+sUGmocfBSVzKGZHTWa/Pn999YBF5eBW86uY=; b=HmRiBARyPM06LMZajCZb+DGAxu DmgwtsEM7Ml5uZpe3FgM3HxWL8eC6Wf3ztDZJRgtpOKjVGGvsIv4lmWfk8De9VRh1OELS04igS5LM sYthgM8d7OJL1k2/BWyplj1Am2ZymtqSUJtoVFaQpLLcrHX85LMVPro57kVMyD/HMmarWJvPRy6/T h/ysIqdyI9ChBMuIVR5+3Y2jLflu/HtT1zmm8PaDlFkwZ5Gan/XkI44amn5GloHKh6yycc1zZ4zKV BK9TUHOq5b+IJ2VdzTeJrfEeoJusnpOsBTwReE24j/DuVHpEWaGhlVVBbjM45CGel/wQz1COBBXzL 4sEy1xLA==; Received: from [189.7.87.169] (helo=prince) by fanzine2.igalia.com with esmtpsa (Cipher TLS1.3:ECDHE_X25519__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim) id 1w7tWv-009twc-LF; Wed, 01 Apr 2026 13:14:38 +0200 From: =?UTF-8?q?Ma=C3=ADra=20Canal?= To: Michael Turquette , Stephen Boyd , Florian Fainelli , Broadcom internal kernel review list , Mark Brown , Maxime Ripard , Stefan Wahren , Dom Cobley , Dave Stevenson Cc: linux-clk@vger.kernel.org, linux-rpi-kernel@lists.infradead.org, linux-arm-kernel@lists.infradead.org, kernel-dev@igalia.com, =?UTF-8?q?Ma=C3=ADra=20Canal?= Subject: [PATCH] clk: bcm: rpi: Mark VEC clock as CLK_IGNORE_UNUSED Date: Wed, 1 Apr 2026 08:13:57 -0300 Message-ID: <20260401111416.562279-2-mcanal@igalia.com> X-Mailer: git-send-email 2.53.0 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260401_041452_384512_21952956 X-CRM114-Status: UNSURE ( 9.71 ) X-CRM114-Notice: Please train this message. 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 Raspberry Pi 3B, the VEC clock is used by the VideoCore firmware display driver, which remains active until the vc4 driver loads and sends NOTIFY_DISPLAY_DONE. If this clock is disabled during boot, a bus lockup happens and the firmware becomes unresponsive, causing a complete system lockup. Mark the VEC clock with CLK_IGNORE_UNUSED so it survives the unused clock disablement and remains available until the vc4 driver takes over display management. Fixes: 672299736af6 ("clk: bcm: rpi: Manage clock rate in prepare/unprepare callbacks") Reported-by: Mark Brown Signed-off-by: Maíra Canal --- drivers/clk/bcm/clk-raspberrypi.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/clk/bcm/clk-raspberrypi.c b/drivers/clk/bcm/clk-raspberrypi.c index df2d246eb6ef..f1a99de6de4f 100644 --- a/drivers/clk/bcm/clk-raspberrypi.c +++ b/drivers/clk/bcm/clk-raspberrypi.c @@ -160,6 +160,13 @@ raspberrypi_clk_variants[RPI_FIRMWARE_NUM_CLK_ID] = { [RPI_FIRMWARE_VEC_CLK_ID] = { .export = true, .minimize = true, + + /* + * If this clock is disabled during boot, it causes a bus + * lockup in RPi 3B. Therefore, make sure it's left enabled + * during boot. + */ + .flags = CLK_IGNORE_UNUSED, }, [RPI_FIRMWARE_DISP_CLK_ID] = { .export = true, -- 2.53.0