From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C4715C25B75 for ; Mon, 3 Jun 2024 06:33:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=GdXtUmsmoaoOUauE6zGHFtP2ANUoq4oV6RdDHjILNbI=; b=mO5XDsm9aaBx2a 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wens@kernel.org, Dragan Simic Cc: linux-rockchip@lists.infradead.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, robh+dt@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, Diederik de Haas Subject: Re: [PATCH] arm64: dts: rockchip: Fix the DCDC_REG2 minimum voltage on Quartz64 Model B Date: Mon, 03 Jun 2024 08:33:16 +0200 Message-ID: <2165494.3Lj2Plt8kZ@diego> In-Reply-To: References: MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240602_233323_100167_7B65A4B6 X-CRM114-Status: GOOD ( 67.23 ) X-BeenThere: linux-rockchip@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Upstream kernel work for Rockchip platforms List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "Linux-rockchip" Errors-To: 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krzk+dt@kernel.org, conor+dt@kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, Diederik de Haas Subject: Re: [PATCH] arm64: dts: rockchip: Fix the DCDC_REG2 minimum voltage on Quartz64 Model B Date: Mon, 03 Jun 2024 08:33:16 +0200 Message-ID: <2165494.3Lj2Plt8kZ@diego> In-Reply-To: References: Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="UTF-8" Am Montag, 3. Juni 2024, 06:51:58 CEST schrieb Dragan Simic: > On 2024-06-03 06:41, Dragan Simic wrote: > > On 2024-06-03 05:49, Chen-Yu Tsai wrote: > >> On Sat, Jun 1, 2024 at 6:41=E2=80=AFAM Dragan Simic =20 > >> wrote: > >>> On 2024-05-31 20:40, Heiko St=C3=BCbner wrote: > >>> > Am Freitag, 31. Mai 2024, 00:48:45 CEST schrieb Dragan Simic: > >>> >> On 2024-05-29 18:27, Chen-Yu Tsai wrote: > >>> >> > On Tue, May 21, 2024 at 1:20=E2=80=AFAM Dragan Simic > >>> >> > wrote: > >>> >> >> > >>> >> >> Correct the specified regulator-min-microvolt value for the buck > >>> >> >> DCDC_REG2 > >>> >> >> regulator, which is part of the Rockchip RK809 PMIC, in the Pin= e64 > >>> >> >> Quartz64 > >>> >> >> Model B board dts. According to the RK809 datasheet, version 1= =2E01, > >>> >> >> this > >>> >> >> regulator is capable of producing voltages as low as 0.5 V on i= ts > >>> >> >> output, > >>> >> >> instead of going down to 0.9 V only, which is additionally conf= irmed > >>> >> >> by the > >>> >> >> regulator-min-microvolt values found in the board dts files for= the > >>> >> >> other > >>> >> >> supported boards that use the same RK809 PMIC. > >>> >> >> > >>> >> >> This allows the DVFS to clock the GPU on the Quartz64 Model B b= elow > >>> >> >> 700 MHz, > >>> >> >> all the way down to 200 MHz, which saves some power and reduces= the > >>> >> >> amount of > >>> >> >> generated heat a bit, improving the thermal headroom and possib= ly > >>> >> >> improving > >>> >> >> the bursty CPU and GPU performance on this board. > >>> >> >> > >>> >> >> This also eliminates the following warnings in the kernel log: > >>> >> >> > >>> >> >> core: _opp_supported_by_regulators: OPP minuV: 825000 maxuV: = 825000, > >>> >> >> not supported by regulator > >>> >> >> panfrost fde60000.gpu: _opp_add: OPP not supported by regulat= ors > >>> >> >> (200000000) > >>> >> >> core: _opp_supported_by_regulators: OPP minuV: 825000 maxuV: = 825000, > >>> >> >> not supported by regulator > >>> >> >> panfrost fde60000.gpu: _opp_add: OPP not supported by regulat= ors > >>> >> >> (300000000) > >>> >> >> core: _opp_supported_by_regulators: OPP minuV: 825000 maxuV: = 825000, > >>> >> >> not supported by regulator > >>> >> >> panfrost fde60000.gpu: _opp_add: OPP not supported by regulat= ors > >>> >> >> (400000000) > >>> >> >> core: _opp_supported_by_regulators: OPP minuV: 825000 maxuV: = 825000, > >>> >> >> not supported by regulator > >>> >> >> panfrost fde60000.gpu: _opp_add: OPP not supported by regulat= ors > >>> >> >> (600000000) > >>> >> >> > >>> >> >> Fixes: dcc8c66bef79 ("arm64: dts: rockchip: add Pine64 Quartz64= =2DB > >>> >> >> device tree") > >>> >> >> Cc: stable@vger.kernel.org > >>> >> >> Reported-By: Diederik de Haas > >>> >> >> Signed-off-by: Dragan Simic > >>> >> >> --- > >>> >> >> arch/arm64/boot/dts/rockchip/rk3566-quartz64-b.dts | 2 +- > >>> >> >> 1 file changed, 1 insertion(+), 1 deletion(-) > >>> >> >> > >>> >> >> diff --git a/arch/arm64/boot/dts/rockchip/rk3566-quartz64-b.dts > >>> >> >> b/arch/arm64/boot/dts/rockchip/rk3566-quartz64-b.dts > >>> >> >> index 26322a358d91..b908ce006c26 100644 > >>> >> >> --- a/arch/arm64/boot/dts/rockchip/rk3566-quartz64-b.dts > >>> >> >> +++ b/arch/arm64/boot/dts/rockchip/rk3566-quartz64-b.dts > >>> >> >> @@ -289,7 +289,7 @@ vdd_gpu: DCDC_REG2 { > >>> >> >> regulator-name =3D "vdd_gpu"; > >>> >> >> regulator-always-on; > >>> >> >> regulator-boot-on; > >>> >> >> - regulator-min-microvolt =3D <90= 0000>; > >>> >> >> + regulator-min-microvolt =3D <50= 0000>; > >>> >> > > >>> >> > The constraints here are supposed to be the constraints of the > >>> >> > consumer, > >>> >> > not the provider. The latter is already known by the implementat= ion. > >>> >> > > >>> >> > So if the GPU can go down to 0.825V or 0.81V even (based on the > >>> >> > datasheet), > >>> >> > this should say the corresponding value. Surely the GPU can't go= down > >>> >> > to > >>> >> > 0.5V? > >>> >> > > >>> >> > Can you send another fix for it? > >>> >> > >>> >> I can confirm that the voltage of the power supply of GPU found in= side > >>> >> the RK3566 can be as low as 0.81 V, according to the datasheet, or= as > >>> >> low as 0.825 V, according to the GPU OPPs found in rk356x.dtsi. > >>> >> > >>> >> If we want the regulator-min-microvolt parameter to reflect the > >>> >> contraint > >>> >> of the GPU as the consumer, which I agree with, we should do that = for > >>> >> other > >>> >> RK3566-based boards as well, and almost surely for the boards base= d on > >>> >> the > >>> >> RK3568, too. > >>> > > >>> > Hmm, I'm not so sure about that. > >>> > > >>> > The binding does define: > >>> > regulator-min-microvolt: > >>> > description: smallest voltage consumers may set > >>> > > >>> > This does not seem to describe it as a constraint solely of the > >>> > consumer. > >>> > At least the wording sounds way more flexible there. > >>> > > >>> > Also any regulator _could_ have multiple consumers, whose value wou= ld > >>> > it need then. > >>>=20 > >>> The way I see it, the regulator-min-microvolt and > >>> regulator-max-microvolt > >>> parameters should be configured in a way that protects the=20 > >>> consumer(s) > >>> of the particular voltage regulator against undervoltage and=20 > >>> overvoltage > >>> conditions, which may be useful in some corner cases. > >>>=20 > >>> If there are multiple consumers, which in this case may actually=20 > >>> happen > >>> (IIRC, some boards use the same regulator for the GPU and NPU=20 > >>> portions > >>> of the SoC), the situation becomes far from ideal, because the=20 > >>> consumers > >>> might have different voltage requirements, but that's pretty much an > >>> unavoidable compromise. > >>=20 > >> As Dragan mentioned, the min/max voltage constraints are there to=20 > >> prevent > >> the implementation from setting a voltage that would make the hardware > >> inoperable, either temporarily or permanently. So the range set here > >> should be the intersection of the permitted ranges of all consumers on > >> that power rail. > >>=20 > >> Now if that intersection happens to be an empty set, then it would up > >> to the implementation to do proper lock-outs. Hopefully no one designs > >> such hardware as it's too easy to fry some part of the hardware. > >=20 > > Yes, such a hardware design would need fixing first on the schematic > > level. When it comes to the RK3566's GPU and NPU sharing the same > > regulator, we should be fine because the RK3566 datasheet states that > > both the GPU and the NPU can go as low as 0.81 V, and their upper > > absolute ratings are the same at 1.2 V, so 1.0 V, which is as far as > > the GPU OPPs go, should be fine for both. > >=20 > > As a note, neither the RK3566 datasheet nor the RK3566 hardware design > > guide specify the recommended upper voltage limit for the GPU or the > > NPU. Though, their upper absolute ratings are the same, as already > > described above. >=20 > Uh-oh, this rabbit hole goes much deeper than expected. After a quick > check, I see there are also RK3399-based boards/devices that specify > the minimum and maximum values for their GPU regulators far outside > the recommended operating conditions of the RK3399's GPU. >=20 > Perhaps the scope of the upcoming patches should be expanded to cover > other boards as well, not just those based on the RK356x. >=20 > >>> > While true, setting it to the lowest the regulator can do in the > >>> > original > >>> > fix patch, might've been a bit much and a saner value might be bett= er. > >>>=20 > >>> Agreed, but the value was selected according to what the other > >>> RK3566-based > >>> boards use, to establish some kind of consistency. Now, there's a=20 > >>> good > >>> chance for the second pass, so to speak, which should establish=20 > >>> another > >>> different state, but also consistent. :) > >>>=20 > >>> >> This would ensure consistency, but I'd like to know are all those > >>> >> resulting > >>> >> patches going to be accepted before starting to prepare them? The= re > >>> >> will > >>> >> be a whole bunch of small patches. > >>> > > >>> > Hmm, though I'd say that would be one patch per soc? > >>> > > >>> > I.e. you're setting the min-voltage of _one_ regulator used > >>> > on each board to a value to support the defined OPPs. > >>> > > >>> > I.e. in my mind you'd end up with: > >>> > arm64: dts: rockchip: set better min voltage for vdd_gpu on r= k356x > >>> > boards > >>> > > >>> > And setting the lower voltage to reach that lower OPP on all affect= ed > >>> > rk356x boards. > >>>=20 > >>> Yes, the same thoughts have already crossed my mind, but I thought=20 > >>> we'd > >>> like those patches to also include Fixes tags, so they also get > >>> propagated > >>> into the long-term kernel versions? In that case, we'd need one=20 > >>> patch > >>> per > >>> board, to have a clear relation to the commits referenced in the=20 > >>> Fixes > >>> tags. > >>>=20 > >>> OTOH, if we don't want the patches to be propagated into the=20 > >>> long-term > >>> kernel > >>> versions, then having one patch per SoC would be perfectly fine. > >>=20 > >> It's really up to Heiko, but personally I don't think it's that=20 > >> important > >> to have them backported. These would be correctness patches, but don't > >> really affect functionality. > >=20 > > On second thought, I also think that it might be better not to have > > these changes propagated into the long-term kernel versions. That > > would keep the amount of backported changes to the bare minimum, i.e. > > containing just the really important fixes, while these changes are > > more on the correctness side. Maybe together with providing a bit > > of additional safety. hehe, up to you I guess :-) . At least we tied down the how (one patch per soc or so) and not meant to be backported because more of the correctnes side. So yes I agree with the arguments for changing the constraints. Heiko From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id F1A21C25B75 for ; Mon, 3 Jun 2024 06:33:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=5gFKiuxFtxZR1vKtz3OlGcUmxZUcg250kVNU+6j6XQw=; b=HOqSgXudcfoewN 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wens@kernel.org, Dragan Simic Cc: linux-rockchip@lists.infradead.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, robh+dt@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, Diederik de Haas Subject: Re: [PATCH] arm64: dts: rockchip: Fix the DCDC_REG2 minimum voltage on Quartz64 Model B Date: Mon, 03 Jun 2024 08:33:16 +0200 Message-ID: <2165494.3Lj2Plt8kZ@diego> In-Reply-To: References: MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240602_233323_100167_7B65A4B6 X-CRM114-Status: GOOD ( 67.23 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: 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