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Fri, 30 Oct 2026 03:34:27 -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.22.2026.10.30.03.34.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 30 Oct 2026 03:34:26 -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 2/3] arm64: dts: mediatek: mt8195-cherry: Fix ramp-delay for Vgpu Date: Fri, 30 Oct 2026 18:34:16 +0800 Message-ID: <20261030103418.2355854-2-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_033428_705995_71F3950E X-CRM114-Status: GOOD ( 14.83 ) 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 Cherry, the MT6315 PMIC at USID 0x7 powering Vgpu has its slew rate configured by firmware to 4500 uV/us, rather than the 6250 uV/us currently specified in the device tree. Since regulator-ramp-delay is specified in uV/us, specifying a higher slew rate than what the PMIC actually uses results in an underestimated voltage ramp time, risking GPU undervoltage when switching to higher operating points. Update regulator-ramp-delay on mt6315_7_vbuck1 to 4500 to match the configured slew rate provided by MediaTek. (Vbcpu on USID 0x6 is configured to 6250 uV/us and needs no change.) Fixes: 260c04d425eb ("arm64: dts: mediatek: cherry: Enable MT6315 regulators on SPMI bus") 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/mt8195-cherry.dtsi | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi b/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi index f23a0c7aa87e..81628d8a4b0e 100644 --- a/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi +++ b/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi @@ -1596,7 +1596,7 @@ mt6315_7_vbuck1: vbuck1 { regulator-min-microvolt = <400000>; regulator-max-microvolt = <1193750>; regulator-enable-ramp-delay = <256>; - regulator-ramp-delay = <6250>; + regulator-ramp-delay = <4500>; regulator-allowed-modes = <0 1 2>; }; }; -- 2.56.0.317.g454f8302e1-goog