linux-kernel - Re: [PATCH] clk: bcm: rpi: Mark ISP clock as critical

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Message-ID: <9ed4a8d5-e39c-469a-8e2a-daf018df7163@gmx.net>
Date: Tue, 28 Oct 2025 17:13:42 +0100
From: Stefan Wahren <wahrenst@....net>
To: Jai Luthra <jai.luthra@...asonboard.com>,
 Michael Turquette <mturquette@...libre.com>, Stephen Boyd
 <sboyd@...nel.org>, Florian Fainelli <florian.fainelli@...adcom.com>,
 Broadcom internal kernel review list
 <bcm-kernel-feedback-list@...adcom.com>, Maíra Canal
 <mcanal@...lia.com>
Cc: linux-clk@...r.kernel.org, linux-rpi-kernel@...ts.infradead.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk: bcm: rpi: Mark ISP clock as critical

Am 28.10.25 um 12:46 schrieb Jai Luthra:
> The ISP clock should also be marked critical to prevent the clock
> framework from disabling it on boot, which can lead to bus lockups when
> the kernel tries to submit buffers to the VC4 ISP firmware.
>
> Link: https://github.com/raspberrypi/linux/issues/7100
> Fixes: 919d6924ae9b ("clk: bcm: rpi: Turn firmware clock on/off when preparing/unpreparing")
> Signed-off-by: Jai Luthra <jai.luthra@...asonboard.com>
Reviewed-by: Stefan Wahren <wahrenst@....net>

Thanks
> ---
>   drivers/clk/bcm/clk-raspberrypi.c | 1 +
>   1 file changed, 1 insertion(+)
>
> diff --git a/drivers/clk/bcm/clk-raspberrypi.c b/drivers/clk/bcm/clk-raspberrypi.c
> index 1a9162f0ae31e330c46f6eafdd00350599b0eede..dcc3ae5fb91650b042d52f02499922786b43afde 100644
> --- a/drivers/clk/bcm/clk-raspberrypi.c
> +++ b/drivers/clk/bcm/clk-raspberrypi.c
> @@ -151,6 +151,7 @@ raspberrypi_clk_variants[RPI_FIRMWARE_NUM_CLK_ID] = {
>   	[RPI_FIRMWARE_ISP_CLK_ID] = {
>   		.export = true,
>   		.minimize = true,
> +		.flags = CLK_IS_CRITICAL,
>   	},
>   	[RPI_FIRMWARE_PIXEL_BVB_CLK_ID] = {
>   		.export = true,
>
> ---
> base-commit: 3a8660878839faadb4f1a6dd72c3179c1df56787
> change-id: 20251028-rpi-isp-clk-eb5c48346e51
>
> Best regards,