From nobody Fri Jun 19 10:17:55 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8C658375F67; Fri, 24 Apr 2026 15:37:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777045050; cv=none; b=ufwUiSnT1ybbLLz6sPSh5sYfROxmEMVfqNTpn+av2PtLVc0GdcdiweqS5F68VZ4U83t5+V77hOp3+80yvP/CpWILEMGqr5eJ95E1gZ6S5zt6pRFOXUcVFG2kWzRKxwl9PH2NFr0154PhvbEPDdX4LQ0Ra/zW5S4rqGjhqgxJewI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777045050; c=relaxed/simple; bh=NzWIjOZQIJ4QSRpkYHMG1j9Yn+1obIkLrovQUw3CG68=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:To:Cc; b=j7EMM5pD/+gzalBVcu2d5U3UsW4M0tscdeg4CEArQIgXIl3ueZOBlgJka0ndx/W89wiCDsyH/3Pg3KLzXHHYvDzZ3BqpI0+0sQamigSooWDMytphhTuIRXYLmIGkxBNpEhP8ThJL7S41QATDtUNxGKRWA6P3QRVWEQhzshLQ+CI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=R6mHxdV3; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="R6mHxdV3" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E2745C19425; Fri, 24 Apr 2026 15:37:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1777045050; bh=NzWIjOZQIJ4QSRpkYHMG1j9Yn+1obIkLrovQUw3CG68=; h=From:Date:Subject:To:Cc:From; b=R6mHxdV3UdHyGtaWwY405z811gxBp5am9Ro/jwNOQZ4CRsgfYKC+9QAcjbdPk2/C0 qstHcDaRN1naerujB6GjBnXeBKSsJWKzaATbIKB8owTUsNki+L8CXgW1QhpqtzDWBo SaxQ8xUkLCR1KYa13IZutKA4uFkH/h5znwBPjaiOIFLaWHC78H2VWq8p/Gi/iEnMxz S8Ad0IlgZX3tbF+ZUsiU2Y7E/gYL0qEosr6SulruTHuoLhz98mPRFy13i+1AEoJ/rJ xfXxBXNvkHNkcbaPdI9VsheC+JD6AJ9BIbW6QhAkpdRtwUeC+R51MJtjMKZ0hQFEC6 J1s7g2YxugjRA== From: Mark Brown Date: Fri, 24 Apr 2026 16:34:52 +0100 Subject: [PATCH] clk: bcm: rpi: Mark VEC clock as CLK_IGNORE_UNUSED Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260424-clk-bcm-fix-pi3-v1-1-8a734e94cecb@kernel.org> X-B4-Tracking: v=1; b=H4sIAJyN62kC/yXMyw5AMBCF4VeRWZukqpHwKmKhNWXc0yIS8e6K5 ZeT81/gyTF5KKILHB3seZkDkjgC09VzS8hNMEghM6FkimYcUJsJLZ+4copSWdLKKpHbBsJrdRS mr1hWv/2uezLbm4H7fgB+P3ymcwAAAA== X-Change-ID: 20260423-clk-bcm-fix-pi3-24feb4f409fd To: Linus Torvalds Cc: Michael Turquette , Stephen Boyd , Florian Fainelli , Broadcom internal kernel review list , Maxime Ripard , =?utf-8?q?Ma=C3=ADra_Canal?= , Brian Masney , linux-clk@vger.kernel.org, linux-rpi-kernel@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Mark Brown X-Mailer: b4 0.16-dev X-Developer-Signature: v=1; a=openpgp-sha256; l=1968; i=broonie@kernel.org; h=from:subject:message-id; bh=IzJd3AuP5Nuq9Zvap5k1h/QxZqkhLbWrWEXCTZ3drAQ=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBp6442kwyoYyGAaCGRGLWTYSjr7u42wii9lDuVL uKQdaNHNdqJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCaeuONgAKCRAk1otyXVSH 0ONgB/9+gWH2IkyXwL8eIwmCvYX2d612vE96lII9rkp/Cj8nfrsP/J56x4e2cISYEQlNv6nJf+A MD05BBQrupEJXlzQT4hs+IVb5fUIjFdqjpoYd6XwPyEyY9UyjM0T18z00nzkRGfpsfKZUpA47qj k/SlroJgKXxwjLeZBJA0SiLYou8EecZL1pKPjPCSvza3cnDtsamVGjDYEnWmdfpYH7cUFAnlHfe ac6IHs+EMvf0K3+6mDyNWajAVp1k1hHjRN8mhSfJ+ZbZUIaC/c/5WZRcjfpT33xizKSYCEaxaK4 nMef375Ckcoljrdx+3+AZBnBOwxGY7SQn26rx71dcgSvsALN X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB From: Ma=C3=ADra Canal 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 Closes: https://lore.kernel.org/r/5f0bec08-f458-4fba-8bf3-06817a100c4c@sire= na.org.uk Signed-off-by: Ma=C3=ADra Canal Link: https://patch.msgid.link/20260401111416.562279-2-mcanal@igalia.com Tested-by: Mark Brown Signed-off-by: Mark Brown Acked-by: Brian Masney # Active contributor to clk --- Resending this fix directly in the hope of getting it into -rc1 since this is a clear boot regression and neither the original report nor the fix have had any response for some reason. --- 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-raspbe= rrypi.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] =3D { [RPI_FIRMWARE_VEC_CLK_ID] =3D { .export =3D true, .minimize =3D 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 =3D CLK_IGNORE_UNUSED, }, [RPI_FIRMWARE_DISP_CLK_ID] =3D { .export =3D true, --- base-commit: 672299736af6c398e867782708b7400957e62c76 change-id: 20260423-clk-bcm-fix-pi3-24feb4f409fd Best regards, -- =20 Mark Brown