linux-kernel - Re: [PATCH v4 0/2] Add SMI reset and clamp for MediaTek MT8188 SoC

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Message-ID: <20250222-miniature-coral-starling-eda1bc@krzk-bin>
Date: Sat, 22 Feb 2025 10:45:28 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Friday Yang <friday.yang@...iatek.com>
Cc: Yong Wu <yong.wu@...iatek.com>, Rob Herring <robh@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, Matthias Brugger <matthias.bgg@...il.com>, 
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, Philipp Zabel <p.zabel@...gutronix.de>, 
	linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH v4 0/2] Add SMI reset and clamp for MediaTek MT8188 SoC

On Fri, Feb 21, 2025 at 03:48:30PM +0800, Friday Yang wrote:
> Based on tag: next-20250220, linux-next/master
> 
> On the MediaTek MT8188 SoC platform, we encountered power-off failures
> and SMI bus hang issues during camera stress tests. The issue arises
> because bus glitches are sometimes produced when MTCMOS powers on or
> off. While this is fairly normal, the software must handle these
> glitches to avoid mistaking them for transaction signals. What's
> more, this issue emerged only after the initial upstreaming of SMI
> driver.
> 
> The software solutions can be summarized as follows:
> 
> 1. Use CLAMP to disable the SMI sub-common port after turning off the
>    LARB CG and before turning off the LARB MTCMOS.
> 2. Use CLAMP to disable/enable the SMI sub-common port.
> 3. Implement an AXI reset for SMI LARBs.
> 
> Changes v4:
> - Use 'devm_reset_control_get_optional_exclusive' instead of
>   'devm_reset_control_get'.
> 
> v3:
> https://lore.kernel.org/lkml/20250121064934.13482-2-

That's not a valid link. Fix your email client.

Best regards,
Krzysztof