linux-kernel - [PATCH v2 0/3] pmdomain: mediatek: solve power domain glitch issue

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Message-ID: <20240327055732.28198-1-yu-chang.lee@mediatek.com>
Date: Wed, 27 Mar 2024 13:57:29 +0800
From: yu-chang.lee <yu-chang.lee@...iatek.com>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski
	<krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, "Ulf
 Hansson" <ulf.hansson@...aro.org>, Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	"MandyJH Liu" <mandyjh.liu@...iatek.com>
CC: <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-pm@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-mediatek@...ts.infradead.org>,
	<Project_Global_Chrome_Upstream_Group@...iatek.com>, <fan.chen@...iatek.com>,
	<xiufeng.li@...iatek.com>, <yu-chang.lee@...iatek.com>
Subject: [PATCH v2 0/3] pmdomain: mediatek: solve power domain glitch issue

Hi,

This series aims to solve power-off failures and occasional SMI hang issues that
occur during camera stress tests. The issue arises because, when MTCMOS powers on
or off, signal glitches are sometimes produced. This is fairly normal, but the 
software must address it to avoid mistaking the glitch for a transaction signal.

The solutions in these patches can be summarized as follows:

1. Disable the sub-common port after turning off the Larb CG and before turning 
   off the Larb MTCMOS.
2. Use CLAMP to disable/enable the SMI common port.
3. Implement an AXI reset.
For previous discussion on the direction of the code modifications, please refer
to: https://lore.kernel.org/linux-arm-kernel/c476cc48-17ec-4e14-98d8-35bdffb5d296@collabora.com/

Change in v2
 - fix commit title to "pmdomain: mediatek:"
 - add dt-binding definition
 - remove unused function

yu-chang.lee (3):
  pmdomain: mediatek: add smi_larb_reset function when power on
  dt-bindings: power: Add mediatek larb definition
  pmdomain: mediatek: support smi clamp protection

 .../power/mediatek,power-controller.yaml      |   4 +
 drivers/pmdomain/mediatek/mt8188-pm-domains.h |  69 ++++++-
 drivers/pmdomain/mediatek/mtk-pm-domains.c    | 168 ++++++++++++++----
 drivers/pmdomain/mediatek/mtk-pm-domains.h    |  13 ++
 4 files changed, 218 insertions(+), 36 deletions(-)

-- 
2.18.0