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

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Message-ID: <35f09250a310021a6cccd0f0aa569468d9f6c52f.camel@mediatek.com>
Date: Mon, 24 Feb 2025 06:11:16 +0000
From: Friday Yang (杨阳) <Friday.Yang@...iatek.com>
To: "krzk@...nel.org" <krzk@...nel.org>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mediatek@...ts.infradead.org" <linux-mediatek@...ts.infradead.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
	Yong Wu (吴勇) <Yong.Wu@...iatek.com>,
	"conor+dt@...nel.org" <conor+dt@...nel.org>, "robh@...nel.org"
	<robh@...nel.org>, Project_Global_Chrome_Upstream_Group
	<Project_Global_Chrome_Upstream_Group@...iatek.com>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "matthias.bgg@...il.com"
	<matthias.bgg@...il.com>, AngeloGioacchino Del Regno
	<angelogioacchino.delregno@...labora.com>
Subject: Re: [PATCH v4 0/2] Add SMI reset and clamp for MediaTek MT8188 SoC

On Sat, 2025-02-22 at 10:45 +0100, Krzysztof Kozlowski wrote:
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
> 
> 
> 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.
> 

Sorry for the inconvenience. The Web link is quite long, so I have
split it into two lines. Please copy the entire link and paste it into
the browser, it sholuld work. 


> Best regards,
> Krzysztof
>