From: Robin Murphy <robin.murphy@arm.com>
To: Sascha Hauer <s.hauer@pengutronix.de>, Mark Brown <broonie@kernel.org>
Cc: 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 12:54:06 +0000 [thread overview]
Message-ID: <baa1603a-a6e2-4a32-a5fb-dc1eff01189c@arm.com> (raw)
In-Reply-To: <20211222104036.GY6003@pengutronix.de>
On 2021-12-22 10:40, Sascha Hauer wrote:
> On Mon, Dec 20, 2021 at 12:53:58PM +0000, Mark Brown wrote:
>> On Mon, Dec 20, 2021 at 10:44:35AM +0100, Sascha Hauer wrote:
>>
>>> Well, all true and on one specific board the regulator is indeed not
>>> optional. However, on all other power domains that don't need a
>>> regulator and all other boards and all other SoCs this driver is used we
>>> now get:
>>
>> This seems unlikely to be board specific, if the chip requires power the
>> chip requires power. If there are power domains that don't take
>> external supplies then they shouldn't be requesting any regulators and
>> should be fixed.
>>
>>> [ 0.185588] rk-power-domain rk-power-domain.8: supply power not found, using dummy regulator
>>
>> It seems vanishingly unlikely that the SoC takes a single supply called
>> "power" shared by everything in the SoC but that is what the code
>> appears to be requesting - the power domains should be requesting the
>> supplies they actually use, and as ever the supplies should be named
>> such that someone looking at the schematic can hook them up. The
>> general recommendation is to use the names used in the datasheet.
>
> Ok. I'll change the patch in a way that only for the GPU power domain on
> rk3568 a supply is requested. That's the one power domain I know that a
> regulator is needed. I'm sure there are more, if not on rk3568 then
> probably on other SoCs the driver handles. Once we notice that other
> domains need a supply we'll have to add the supply name to driver data
> for that domain.
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).
Thanks,
Robin.
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next prev parent reply other threads:[~2021-12-22 12:54 UTC|newest]
Thread overview: 18+ 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 ` [PATCH 1/4] soc: rockchip: power-domain: register device for each domain 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 ` [PATCH 3/4] soc: rockchip: power-domain: Add regulator support Sascha Hauer
2021-12-20 9:44 ` Sascha Hauer
2021-12-20 10:46 ` Robin Murphy
2021-12-20 12:56 ` Mark Brown
2021-12-20 12:53 ` Mark Brown
2021-12-22 10:40 ` Sascha Hauer
2021-12-22 12:54 ` Robin Murphy [this message]
2021-12-22 13:00 ` Mark Brown
2021-12-22 13:19 ` Robin Murphy
2021-12-22 13:25 ` Mark Brown
2021-12-22 13:29 ` Michael Riesch
2021-12-22 13:37 ` Michael Riesch
2021-12-22 13:40 ` Mark Brown
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
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