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From: AngeloGioacchino Del Regno
<angelogioacchino.delregno@collabora.com>
To: matthias.bgg@gmail.com
Cc: robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org,
angelogioacchino.delregno@collabora.com,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-mediatek@lists.infradead.org, wenst@chromium.org
Subject: [PATCH v4 11/19] arm64: dts: mediatek: mt8192-asurada: Fix voltage
constraint for Vgpu
Date: Wed, 1 Mar 2023 10:55:15 +0100
Message-Id: <20230301095523.428461-12-angelogioacchino.delregno@collabora.com>
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| Series |
Enable GPU with DVFS support on MediaTek SoCs
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Commit Message
AngeloGioacchino Del Regno
March 1, 2023, 9:55 a.m. UTC
The MT8192 SoC specifies a maximum voltage for the GPU's digital supply
of 0.88V and the GPU OPPs are declaring a maximum voltage of 0.80V.
In order to keep the GPU voltage in the safe range, change the maximum
voltage for mt6315@7's vbuck1 to 0.80V as sending, for any mistake,
1.193V would be catastrophic.
Fixes: 3183cb62b033 ("arm64: dts: mediatek: asurada: Add SPMI regulators")
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
---
arch/arm64/boot/dts/mediatek/mt8192-asurada.dtsi | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
Comments
On Wed, Mar 1, 2023 at 5:55 PM AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> wrote: > > The MT8192 SoC specifies a maximum voltage for the GPU's digital supply > of 0.88V and the GPU OPPs are declaring a maximum voltage of 0.80V. > > In order to keep the GPU voltage in the safe range, change the maximum > voltage for mt6315@7's vbuck1 to 0.80V as sending, for any mistake, > 1.193V would be catastrophic. > > Fixes: 3183cb62b033 ("arm64: dts: mediatek: asurada: Add SPMI regulators") > Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> Reviewed-by: Chen-yu Tsai <wenst@chromium.org>
diff --git a/arch/arm64/boot/dts/mediatek/mt8192-asurada.dtsi b/arch/arm64/boot/dts/mediatek/mt8192-asurada.dtsi index df477eb89f21..8570b78c04a4 100644 --- a/arch/arm64/boot/dts/mediatek/mt8192-asurada.dtsi +++ b/arch/arm64/boot/dts/mediatek/mt8192-asurada.dtsi @@ -1408,7 +1408,7 @@ mt6315_7_vbuck1: vbuck1 { regulator-compatible = "vbuck1"; regulator-name = "Vgpu"; regulator-min-microvolt = <606250>; - regulator-max-microvolt = <1193750>; + regulator-max-microvolt = <800000>; regulator-enable-ramp-delay = <256>; regulator-allowed-modes = <0 1 2>; };