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Fri, 23 Jan 2026 15:00:22 -0800 (PST) From: Prabhakar X-Google-Original-From: Prabhakar To: Geert Uytterhoeven , Magnus Damm , Rob Herring , Krzysztof Kozlowski , Conor Dooley , linux-renesas-soc@vger.kernel.org Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Prabhakar , Biju Das , Fabrizio Castro , Lad Prabhakar Subject: [PATCH 1/4] arm64: dts: renesas: rzt2h-n2h-evk: Add ramp delay for SD0 card regulator Date: Fri, 23 Jan 2026 22:59:54 +0000 Message-ID: <20260123225957.1007089-2-prabhakar.mahadev-lad.rj@bp.renesas.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260123225957.1007089-1-prabhakar.mahadev-lad.rj@bp.renesas.com> References: <20260123225957.1007089-1-prabhakar.mahadev-lad.rj@bp.renesas.com> Precedence: bulk X-Mailing-List: linux-kernel@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" From: Lad Prabhakar Add a ramp delay of 60 uV/us to the vqmmc_sdhi0 voltage regulator to fix UHS-I SD card detection failures. Measurements on CN78 pin 4 showed the actual voltage ramp time to be 21.86ms when switching between 3.3V and 1.8V. A 25ms ramp delay has been configured to provide adequate margin. The calculation is based on the voltage delta of 1.5V (3.3V - 1.8V): 1500000 uV / 60 uV/us =3D 25000 us (25ms) Prior to this patch, UHS-I cards failed to initialize with: [ 32.723914] mmc0: error -110 whilst initialising SD card After this patch, UHS-I cards are properly detected on SD0: [ 28.379122] mmc0: new UHS-I speed SDR104 SDXC card at address aaaa [ 28.387239] mmcblk0: mmc0:aaaa SR64G 59.5 GiB Fixes: d065453e5ee09("arm64: dts: renesas: rzt2h-rzn2h-evk: Enable SD card = slot") Signed-off-by: Lad Prabhakar --- arch/arm64/boot/dts/renesas/rzt2h-n2h-evk-common.dtsi | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm64/boot/dts/renesas/rzt2h-n2h-evk-common.dtsi b/arch/a= rm64/boot/dts/renesas/rzt2h-n2h-evk-common.dtsi index 510399febf29..f87c2492f414 100644 --- a/arch/arm64/boot/dts/renesas/rzt2h-n2h-evk-common.dtsi +++ b/arch/arm64/boot/dts/renesas/rzt2h-n2h-evk-common.dtsi @@ -53,6 +53,7 @@ vqmmc_sdhi0: regulator-vqmmc-sdhi0 { regulator-max-microvolt =3D <3300000>; gpios-states =3D <0>; states =3D <3300000 0>, <1800000 1>; + regulator-ramp-delay =3D <60>; }; #endif =20 --=20 2.52.0