linux-kernel - Re: [PATCH v1 1/1] irqchip/gic-v3: Enable Rockchip 3588001 erratum workaround for RK3588S

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Message-ID: <863525x7eb.wl-maz@kernel.org>
Date:   Mon, 03 Jul 2023 17:54:36 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Sebastian Reichel <sebastian.reichel@...labora.com>
Cc:     Chris Morgan <macromorgan@...mail.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Heiko Stuebner <heiko@...ech.de>,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel@...labora.com
Subject: Re: [PATCH v1 1/1] irqchip/gic-v3: Enable Rockchip 3588001 erratum workaround for RK3588S

On Mon, 03 Jul 2023 17:41:29 +0100,
Sebastian Reichel <sebastian.reichel@...labora.com> wrote:
> 
> Commit a8707f553884 ("irqchip/gic-v3: Add Rockchip 3588001 erratum
> workaround") mentioned RK3588S (the slimmed down variant of RK3588)
> being affected, but did not check for its compatible value. Thus the
> quirk is not applied on RK3588S. Since the GIC ITS node got added to the
> upstream DT, boards using RK3588S are no longer booting without this
> quirk being applied.
> 
> Fixes: 06cdac8e8407 ("arm64: dts: rockchip: add GIC ITS support to rk3588")
> Signed-off-by: Sebastian Reichel <sebastian.reichel@...labora.com>
> ---
> I recently got a Rock 5A and noticed this issue. Apart from it, the Indiedroid
> Nova should also be affected (I don't have that board). There are no other
> upstream RK3588S boards at the moment.

What about "khadas,edge2"?

> ---
>  drivers/irqchip/irq-gic-v3-its.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
> index 1994541eaef8..034ece9ac47c 100644
> --- a/drivers/irqchip/irq-gic-v3-its.c
> +++ b/drivers/irqchip/irq-gic-v3-its.c
> @@ -4727,7 +4727,8 @@ static bool __maybe_unused its_enable_rk3588001(void *data)
>  {
>  	struct its_node *its = data;
>  
> -	if (!of_machine_is_compatible("rockchip,rk3588"))
> +	if (!of_machine_is_compatible("rockchip,rk3588") &&
> +	    !of_machine_is_compatible("rockchip,rk3588s"))
>  		return false;
>  
>  	its->flags |= ITS_FLAGS_FORCE_NON_SHAREABLE;

I don't mind taking this, but it also mean that only a new kernel will
boot. Shouldn't you *also* fix the DT so that it advertises rk3588 as
a fallback to rk3588s? This would ensure that an old kernel can boot
as well.

	M.

-- 
Without deviation from the norm, progress is not possible.