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Fri, 30 Oct 2026 03:34:25 -0700 (PDT) Received: from wenst-7875.tpe.corp.google.com ([2a00:79e0:203d:7:6ef0:e162:ed32:a99f]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-36a42a61a0csm7471774eec.22.2026.10.30.03.34.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 30 Oct 2026 03:34:24 -0700 (PDT) From: Chen-Yu Tsai To: Matthias Brugger , AngeloGioacchino Del Regno Cc: Chen-Yu Tsai , linux-mediatek@lists.infradead.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, stable@vger.kernel.org Subject: [PATCH 1/3] arm64: dts: mediatek: mt8192-asurada: Add ramp-delay for MT6315 regulators Date: Fri, 30 Oct 2026 18:34:15 +0800 Message-ID: <20261030103418.2355854-1-wenst@chromium.org> X-Mailer: git-send-email 2.56.0.317.g454f8302e1-goog X-Archived-By: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261030_033426_752356_A1B7EE8A X-CRM114-Status: UNSURE ( 9.28 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -2.1 (--) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-mediatek" X-Spam-Status: No, score=-18.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On Asurada, the MT6315 buck regulators (Vbcpu, Vlcpu, and Vgpu) are missing the regulator-ramp-delay property. Without the slew rate specified, voltage increases may not have settled before switching CPU or GPU to higher operating points, risking undervoltage crashes. Add regulator-ramp-delay properties matching the slew rates configured by firmware, with values provided by MediaTek: 8000 uV/us for Vbcpu, and 4500 uV/us for Vlcpu and Vgpu. Fixes: 3183cb62b033 ("arm64: dts: mediatek: asurada: Add SPMI regulators") Cc: Signed-off-by: Chen-Yu Tsai --- Patch created with LLM. Values were translated from raw register values by MediaTek. --- arch/arm64/boot/dts/mediatek/mt8192-asurada.dtsi | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/arm64/boot/dts/mediatek/mt8192-asurada.dtsi b/arch/arm64/boot/dts/mediatek/mt8192-asurada.dtsi index d1993b80f9ce..43286241cd22 100644 --- a/arch/arm64/boot/dts/mediatek/mt8192-asurada.dtsi +++ b/arch/arm64/boot/dts/mediatek/mt8192-asurada.dtsi @@ -1812,6 +1812,7 @@ mt6315_6_vbuck1: vbuck1 { regulator-min-microvolt = <400000>; regulator-max-microvolt = <1193750>; regulator-enable-ramp-delay = <256>; + regulator-ramp-delay = <8000>; regulator-allowed-modes = <0 1 2>; regulator-always-on; }; @@ -1821,6 +1822,7 @@ mt6315_6_vbuck3: vbuck3 { regulator-min-microvolt = <400000>; regulator-max-microvolt = <1193750>; regulator-enable-ramp-delay = <256>; + regulator-ramp-delay = <4500>; regulator-allowed-modes = <0 1 2>; regulator-always-on; }; @@ -1841,6 +1843,7 @@ mt6315_7_vbuck1: vbuck1 { regulator-min-microvolt = <400000>; regulator-max-microvolt = <800000>; regulator-enable-ramp-delay = <256>; + regulator-ramp-delay = <4500>; regulator-allowed-modes = <0 1 2>; regulator-coupled-with = <&mt6359_vsram_others_ldo_reg>; regulator-coupled-max-spread = <10000>; -- 2.56.0.317.g454f8302e1-goog