From: Stephen Boyd <sboyd@kernel.org>
To: Linus Torvalds <torvalds@linux-foundation.org>,
Mark Brown <broonie@kernel.org>
Cc: "Michael Turquette" <mturquette@baylibre.com>,
"Florian Fainelli" <florian.fainelli@broadcom.com>,
"Broadcom internal kernel review list"
<bcm-kernel-feedback-list@broadcom.com>,
"Maxime Ripard" <mripard@kernel.org>,
"Maíra Canal" <mcanal@igalia.com>,
"Brian Masney" <bmasney@redhat.com>,
linux-clk@vger.kernel.org, linux-rpi-kernel@lists.infradead.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, "Mark Brown" <broonie@kernel.org>
Subject: Re: [PATCH] clk: bcm: rpi: Mark VEC clock as CLK_IGNORE_UNUSED
Date: Sat, 25 Apr 2026 10:51:51 -0700 [thread overview]
Message-ID: <177713951108.5403.14915756699205242219@localhost.localdomain> (raw)
In-Reply-To: <20260424-clk-bcm-fix-pi3-v1-1-8a734e94cecb@kernel.org>
Quoting Mark Brown (2026-04-24 08:34:52)
> From: Maíra Canal <mcanal@igalia.com>
>
> 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 <broonie@kernel.org>
> Closes: https://lore.kernel.org/r/5f0bec08-f458-4fba-8bf3-06817a100c4c@sirena.org.uk
> Signed-off-by: Maíra Canal <mcanal@igalia.com>
> Link: https://patch.msgid.link/20260401111416.562279-2-mcanal@igalia.com
> Tested-by: Mark Brown <broonie@kernel.org>
> Signed-off-by: Mark Brown <broonie@kernel.org>
> ---
Applied to clk-fixes
next prev parent reply other threads:[~2026-04-25 18:06 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-24 15:34 [PATCH] clk: bcm: rpi: Mark VEC clock as CLK_IGNORE_UNUSED Mark Brown
2026-04-24 17:45 ` Brian Masney
2026-04-25 17:51 ` Stephen Boyd [this message]
-- strict thread matches above, loose matches on Subject: below --
2026-04-01 11:13 Maíra Canal
2026-04-01 12:05 ` Mark Brown
2026-04-13 12:29 ` Maíra Canal
2026-04-24 16:32 ` Stefan Wahren
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