The default state of SD bus and clock line is logical HI. SD card IO is open-drain and pulls the bus lines LO. Always enable the SD bus pull ups to guarantee this behavior. Note that on systems with bus voltage level shifter on the SD bus, the pull ups might also be built into the level shifter, however that should have no negative impact.
Signed-off-by: Marek Vasut <[email protected]> Cc: Patrice Chotard <[email protected]> Cc: Patrick Delaunay <[email protected]> --- arch/arm/dts/stm32mp15-pinctrl.dtsi | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/arch/arm/dts/stm32mp15-pinctrl.dtsi b/arch/arm/dts/stm32mp15-pinctrl.dtsi index 154832983c..2f8ff44a7a 100644 --- a/arch/arm/dts/stm32mp15-pinctrl.dtsi +++ b/arch/arm/dts/stm32mp15-pinctrl.dtsi @@ -1184,13 +1184,13 @@ <STM32_PINMUX('D', 2, AF12)>; /* SDMMC1_CMD */ slew-rate = <1>; drive-push-pull; - bias-disable; + bias-pull-up; }; pins2 { pinmux = <STM32_PINMUX('C', 12, AF12)>; /* SDMMC1_CK */ slew-rate = <2>; drive-push-pull; - bias-disable; + bias-pull-up; }; }; @@ -1340,13 +1340,13 @@ <STM32_PINMUX('G', 6, AF10)>; /* SDMMC2_CMD */ slew-rate = <1>; drive-push-pull; - bias-disable; + bias-pull-up; }; pins2 { pinmux = <STM32_PINMUX('E', 3, AF9)>; /* SDMMC2_CK */ slew-rate = <2>; drive-push-pull; - bias-disable; + bias-pull-up; }; }; -- 2.28.0
