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SD spec (section 6.4.1.3) requires VDD < 0.5V for minimum 1ms during power cycle. Measured discharge time on this board is ~632.97ms to reach < 0.5V threshold. During boot, MMC power cycles between boot stages. Without power off delay, VDD doesn't fully discharge. Card retains 1.8V signaling state from previous boot stages. When MMC driver later initializes, card no longer asserts S18A in ACMD41 response (already switched to 1.8V). Host misinterprets card state and forces 1.8V anyway, falling into a bad state and causes MMC init failure with "unable to select a mode" signature. Add power-off-delay-us = 650000 (650ms) to ensure proper VDD discharge during power cycles, allowing card to fully reset state between boot stages. Signed-off-by: Judith Mendez --- Changes since v1: - Fixup commit header and description --- arch/arm64/boot/dts/ti/k3-am654-base-board.dts | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm64/boot/dts/ti/k3-am654-base-board.dts b/arch/arm64/boot/dts/ti/k3-am654-base-board.dts index ca1300e130936..edcf039ccfbd0 100644 --- a/arch/arm64/boot/dts/ti/k3-am654-base-board.dts +++ b/arch/arm64/boot/dts/ti/k3-am654-base-board.dts @@ -460,6 +460,7 @@ &sdhci0 { &sdhci1 { status = "okay"; vmmc-supply = <&vdd_mmc1_sd>; + power-off-delay-us = <650000>; pinctrl-names = "default"; pinctrl-0 = <&main_mmc1_pins_default>; ti,driver-strength-ohm = <50>; -- 2.34.1