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From: Mark Brown <broonie@kernel.org>
To: Robin Murphy <robin.murphy@arm.com>
Cc: Sascha Hauer <s.hauer@pengutronix.de>,
	linux-rockchip@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org,
	Heiko Stuebner <heiko@sntech.de>,
	Michael Riesch <michael.riesch@wolfvision.net>,
	kernel@pengutronix.de
Subject: Re: [PATCH 3/4] soc: rockchip: power-domain: Add regulator support
Date: Wed, 22 Dec 2021 13:00:27 +0000	[thread overview]
Message-ID: <YcMhazsAfU26fCa3@sirena.org.uk> (raw)
In-Reply-To: <baa1603a-a6e2-4a32-a5fb-dc1eff01189c@arm.com>


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On Wed, Dec 22, 2021 at 12:54:06PM +0000, Robin Murphy wrote:

> Certainly RK3399 (and I guess RK3288 too) suffers from the same
> priority-inversion issue of being unaware that VD_GPU needs power before
> PD_GPU can be successfully turned on to probe the GPU to claim and enable
> the regulator (via "mali-supply" for DVFS purposes) that needed to be on in
> the first place. Currently all the boards are bodging around this with
> "regulator-always-on" (e.g. commit 06b2818678d9).

Does the SoC actually support the supply being completely off in
operation?  A lot of devices want everything powered even if idle during
full operation since keeping voltage differentials smaller makes it a
lot easier to design to avoid leakage current type issues at the points
where the different power domains connect.

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_______________________________________________
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Linux-rockchip@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-rockchip

WARNING: multiple messages have this Message-ID (diff)
From: Mark Brown <broonie@kernel.org>
To: Robin Murphy <robin.murphy@arm.com>
Cc: Sascha Hauer <s.hauer@pengutronix.de>,
	linux-rockchip@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org,
	Heiko Stuebner <heiko@sntech.de>,
	Michael Riesch <michael.riesch@wolfvision.net>,
	kernel@pengutronix.de
Subject: Re: [PATCH 3/4] soc: rockchip: power-domain: Add regulator support
Date: Wed, 22 Dec 2021 13:00:27 +0000	[thread overview]
Message-ID: <YcMhazsAfU26fCa3@sirena.org.uk> (raw)
In-Reply-To: <baa1603a-a6e2-4a32-a5fb-dc1eff01189c@arm.com>


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On Wed, Dec 22, 2021 at 12:54:06PM +0000, Robin Murphy wrote:

> Certainly RK3399 (and I guess RK3288 too) suffers from the same
> priority-inversion issue of being unaware that VD_GPU needs power before
> PD_GPU can be successfully turned on to probe the GPU to claim and enable
> the regulator (via "mali-supply" for DVFS purposes) that needed to be on in
> the first place. Currently all the boards are bodging around this with
> "regulator-always-on" (e.g. commit 06b2818678d9).

Does the SoC actually support the supply being completely off in
operation?  A lot of devices want everything powered even if idle during
full operation since keeping voltage differentials smaller makes it a
lot easier to design to avoid leakage current type issues at the points
where the different power domains connect.

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_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  reply	other threads:[~2021-12-22 13:00 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-17 13:09 [PATCH 0/4] soc: rockchip: power-domain: Add regulator support Sascha Hauer
2021-12-17 13:09 ` Sascha Hauer
2021-12-17 13:09 ` [PATCH 1/4] soc: rockchip: power-domain: register device for each domain Sascha Hauer
2021-12-17 13:09   ` Sascha Hauer
2021-12-17 13:09 ` [PATCH 2/4] soc: rockchip: power-domain: Use devm_clk_bulk_get_all() Sascha Hauer
2021-12-17 13:09   ` Sascha Hauer
2021-12-17 13:09 ` [PATCH 3/4] soc: rockchip: power-domain: Add regulator support Sascha Hauer
2021-12-17 13:09   ` Sascha Hauer
2021-12-20  9:44   ` Sascha Hauer
2021-12-20  9:44     ` Sascha Hauer
2021-12-20 10:46     ` Robin Murphy
2021-12-20 10:46       ` Robin Murphy
2021-12-20 12:56       ` Mark Brown
2021-12-20 12:56         ` Mark Brown
2021-12-20 12:53     ` Mark Brown
2021-12-20 12:53       ` Mark Brown
2021-12-22 10:40       ` Sascha Hauer
2021-12-22 10:40         ` Sascha Hauer
2021-12-22 12:54         ` Robin Murphy
2021-12-22 12:54           ` Robin Murphy
2021-12-22 13:00           ` Mark Brown [this message]
2021-12-22 13:00             ` Mark Brown
2021-12-22 13:19             ` Robin Murphy
2021-12-22 13:19               ` Robin Murphy
2021-12-22 13:25               ` Mark Brown
2021-12-22 13:25                 ` Mark Brown
2021-12-22 13:29                 ` Michael Riesch
2021-12-22 13:29                   ` Michael Riesch
2021-12-22 13:37                   ` Michael Riesch
2021-12-22 13:40                   ` Mark Brown
2021-12-22 13:40                     ` Mark Brown
2022-02-23  8:51                     ` Michael Riesch
2022-02-23  8:51                       ` Michael Riesch
2021-12-17 13:09 ` [PATCH 4/4] dt-bindings: power: rockchip: Add power-supply to domain nodes Sascha Hauer
2021-12-17 13:09   ` Sascha Hauer

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