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Fri, 30 Oct 2026 03:34:29 -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.22.2026.10.30.03.34.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 30 Oct 2026 03:34:28 -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 3/3] arm64: dts: mediatek: mt8186-corsola-voltorb: Add MT6319 ramp-delay Date: Fri, 30 Oct 2026 18:34:17 +0800 Message-ID: <20261030103418.2355854-3-wenst@chromium.org> X-Mailer: git-send-email 2.56.0.317.g454f8302e1-goog In-Reply-To: <20261030103418.2355854-1-wenst@chromium.org> References: <20261030103418.2355854-1-wenst@chromium.org> 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_033430_744539_6CC220A9 X-CRM114-Status: GOOD ( 11.81 ) X-Spam-Score: -2.1 (--) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" 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=unavailable 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 Voltorb and Squirtle, the MT6319 buck1 regulator supplying the big CPU cluster is missing the regulator-ramp-delay property. Without the slew rate specified, voltage increases may not have settled before switching the big CPU cluster to higher operating points, risking undervoltage crashes. Firmware configures the MT6319 slew rate on these designs to 6250 uV/us, with the value provided by MediaTek. Add regulator-ramp-delay = <6250> to mt6319_buck1. Fixes: 321ad586e607 ("arm64: dts: mediatek: Add MT8186 Voltorb Chromebooks") 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/mt8186-corsola-voltorb.dtsi | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm64/boot/dts/mediatek/mt8186-corsola-voltorb.dtsi b/arch/arm64/boot/dts/mediatek/mt8186-corsola-voltorb.dtsi index 0250b4eeadd4..2ec343f49da3 100644 --- a/arch/arm64/boot/dts/mediatek/mt8186-corsola-voltorb.dtsi +++ b/arch/arm64/boot/dts/mediatek/mt8186-corsola-voltorb.dtsi @@ -84,6 +84,7 @@ mt6319_buck1: vbuck1 { regulator-min-microvolt = <600000>; regulator-max-microvolt = <1193750>; regulator-enable-ramp-delay = <256>; + regulator-ramp-delay = <6250>; regulator-allowed-modes = <0 1 2>; regulator-always-on; }; -- 2.56.0.317.g454f8302e1-goog