linux-kernel - Re: [PATCH v2 2/2] arm64: dts: mediatek: mt8186: Add missing xhci clock to usb controllers

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Date: Wed, 14 Feb 2024 10:03:26 +0100
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Nícolas F. R. A. Prado <nfraprado@...labora.com>,
 Matthias Brugger <matthias.bgg@...il.com>
Cc: Chen-Yu Tsai <wenst@...omium.org>,
 Eugen Hristev <eugen.hristev@...labora.com>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>,
 Allen-KH Cheng <allen-kh.cheng@...iatek.com>, kernel@...labora.com,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v2 2/2] arm64: dts: mediatek: mt8186: Add missing xhci
 clock to usb controllers

Il 13/02/24 16:02, Nícolas F. R. A. Prado ha scritto:
> The mtu3 usb controllers don't list the xhci clock, though they require
> it, and thus rely on the bootloader leaving it on in order to work.
> 
> When booting with the upstream arm64 defconfig, the usb controllers will
> defer probe until modules have loaded since they have an indirect
> dependency on CONFIG_MTK_CMDQ, which is configured as a module. However
> at the point where modules are loaded, unused clocks are also disabled,
> causing the usb controllers to probe without the xhci clock enabled and
> fail to probe:
> 
> mtu3 11201000.usb: clks of sts1 are not stable!
> mtu3 11201000.usb: device enable failed -110
> mtu3 11201000.usb: mtu3 hw init failed:-110
> mtu3 11201000.usb: failed to initialize gadget
> mtu3: probe of 11201000.usb failed with error -110
> 
> (and same for the one at 11281000)
> 
> Add the missing clock for the usb controllers so that they can
> successfully probe without relying on the bootloader state.
> 
> Fixes: f6c3e61c5486 ("arm64: dts: mediatek: mt8186: Add MTU3 nodes")
> Signed-off-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>