From: neil.armstrong@linaro.org
To: Raspberry Kan <raspberrykan@stu.hqu.edu.cn>,
sashiko-reviews@lists.linux.dev
Cc: devicetree@vger.kernel.org, robh@kernel.org,
linux-amlogic@lists.infradead.org, conor+dt@kernel.org
Subject: Re: [PATCH 2/2] arm64: dts: amlogic: add Xiaomi Mi Box 4 support
Date: Thu, 3 Sep 2026 09:55:43 +0200 [thread overview]
Message-ID: <3fc38e1c-d9cc-493c-a25a-61a8a173d987@linaro.org> (raw)
In-Reply-To: <ff197003-be1d-4934-bf33-9337bc833168@stu.hqu.edu.cn>
On 9/3/26 09:49, Raspberry Kan wrote:
> First of all, I checked the device tree extracted from the stock firmware, and it explicitly describes a third pixel processor (|pp2|).
>
> The original vendor DTS can be found here:
> https://github.com/Raspberry-Monster/MiBox4-LibreELEC/blob/misc/mibox4_gxl_tf_2g.dts#L10
>
> It specifies three pixel processors and includes interrupts for |IRQPP2| and |IRQPPMMU2|.
>
> I also verified this on the actual Xiaomi Mi Box 4 hardware. Lima successfully detects three pixel processors:
>
> |lima d00c0000.gpu: pp0 - mali450 version major 0 minor 0 lima d00c0000.gpu: pp1 - mali450 version major 0 minor 0 lima d00c0000.gpu: pp2 - mali450 version major 0 minor 0 |
>
> The corresponding |pp2| and |ppmmu2| interrupts are also registered:
>
> |GICv2 200 Level pp2 GICv2 201 Level ppmmu2 |
>
> The driver then initializes successfully:
>
> |[drm] Initialized lima 1.1.0 for d00c0000.gpu on minor 1 |
>
> So this particular S905L-based Mi Box 4 appears to use a Mali-450 MP3 configuration rather than MP2. I have not observed any initialization timeouts, reset errors, or SError failures with the third PP enabled.
>
> As Neil mentioned above, the Mali GPU is already defined in |meson-gx-mali450.dtsi|, so this redundant definition will be removed in v2.
>
> Thanks for the review.
>
Sashiko is right, is it _really_ a GXLX you're running ? The S905L/GXLX does not have the PP2
could you dump the soc info ?
run:
grep ^ /sys/bus/soc/devices/soc*/*
on the device running mainline linux.
Neil
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next prev parent reply other threads:[~2026-09-03 7:56 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-03 7:09 [PATCH 0/2] Add initial device tree support for the Xiaomi Mi Box 4 (MDZ-21-AA), an Amlogic S905L based TV box YuChia-Kan
2026-09-03 7:09 ` [PATCH 1/2] dt-bindings: arm: amlogic: add Xiaomi Mi Box 4 YuChia-Kan
2026-09-03 7:09 ` [PATCH 2/2] arm64: dts: amlogic: add Xiaomi Mi Box 4 support YuChia-Kan
2026-09-03 7:20 ` Neil Armstrong
2026-09-03 7:36 ` sashiko-bot
2026-09-03 7:49 ` Raspberry Kan
2026-09-03 7:55 ` neil.armstrong [this message]
2026-09-03 8:07 ` Raspberry Kan
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