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Fri, 23 Jan 2026 15:00:26 -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 4/4] arm64: dts: renesas: rzv2-evk-cn15-sd: Add ramp delay for SD0 regulator Date: Fri, 23 Jan 2026 22:59:57 +0000 Message-ID: <20260123225957.1007089-5-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 Set an appropriate ramp delay for the SD0 I/O voltage regulator in the CN15 SD overlay to make UHS-I voltage switching reliable during card initialization. This issue was observed on the RZ/V2H EVK, while the same UHS-I cards worked on the RZ/V2N EVK without problems. Adding the ramp delay makes the behavior consistent and avoids SD init timeouts. Before this change SD0 could fail with: [ 2.646242] mmc0: error -110 whilst initialising SD card With the delay in place UHS-I cards enumerate correctly: [ 2.633493] mmc0: new UHS-I speed SDR104 SDXC card at address aaaa [ 2.641687] mmcblk0: mmc0:aaaa SR64G 59.5 GiB [ 2.651489] mmcblk0: p1 Fixes: 3d6c2bc7629c8("arm64: dts: renesas: Add CN15 eMMC and SD overlays fo= r RZ/V2H and RZ/V2N EVKs") Signed-off-by: Lad Prabhakar --- arch/arm64/boot/dts/renesas/rzv2-evk-cn15-sd.dtso | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm64/boot/dts/renesas/rzv2-evk-cn15-sd.dtso b/arch/arm64= /boot/dts/renesas/rzv2-evk-cn15-sd.dtso index 0af1e0a6c7f4..fc53c1aae3b5 100644 --- a/arch/arm64/boot/dts/renesas/rzv2-evk-cn15-sd.dtso +++ b/arch/arm64/boot/dts/renesas/rzv2-evk-cn15-sd.dtso @@ -25,6 +25,7 @@ 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>; }; }; =20 --=20 2.52.0