linux-kernel - Re: [PATCH v2] arm64: dts: mediatek: mt8192-asurada: Add off-on-delay-us for pp3300

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Message-ID: <171689282917.117648.357380073276142240.b4-ty@collabora.com>
Date: Tue, 28 May 2024 12:40:36 +0200
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Matthias Brugger <matthias.bgg@...il.com>,
	Pin-yen Lin <treapking@...omium.org>
Cc: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Nícolas F . R . A . Prado <nfraprado@...labora.com>,
	linux-mediatek@...ts.infradead.org,
	Hsin-Te Yuan <yuanhsinte@...omium.org>,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] arm64: dts: mediatek: mt8192-asurada: Add off-on-delay-us for pp3300_mipibrdg

On Thu, 02 May 2024 23:39:51 +0800, Pin-yen Lin wrote:
> Set off-on-delay-us to 500000 us for pp3300_mipibrdg to make sure it
> complies with the panel's unprepare delay (the time to power down
> completely) of the power sequence. Explicit configuration on the
> regulator node is required because mt8192-asurada uses the same power
> supply for the panel and the anx7625 DP bridge.
> 
> For example, the power sequence could be violated in this sequence:
> 1. Bridge on: panel goes off, but regulator doesn't turn off (refcount=1).
> 2. Bridge off: regulator turns off (refcount=0).
> 3. Bridge resume -> regulator turns on but the bridge driver doesn't
>    check the delay.
> 
> [...]

Applied to v6.10-next/dts64, thanks!

[1/1] arm64: dts: mediatek: mt8192-asurada: Add off-on-delay-us for pp3300_mipibrdg
      commit: 476d7adf84deb884e0f8f74417bf5249ab9a95b3

Cheers,
Angelo