On 18/12/2020 11:43, Marek Szyprowski wrote:
For the proper reboot Odroid-C4 board requires to switch TFLASH_VDD_EN pin to the high impedance mode, otherwise the board is stuck in the middle of loading early stages of the bootloader from SD card.
This can be achieved by using the OPEN_DRAIN flag instead if the ACTIVE_HIGH, what will leave the pin in input to achieve high state (pin has the pull-up) and solve the issue.
Suggested-by: Neil Armstrong narmstrong@baylibre.com Signed-off-by: Marek Szyprowski m.szyprowski@samsung.com
This is a result of the discussion in the "[PATCH/RFC] board: amlogic: Fix Odroid-C4 SD card reboot issue" thread: https://lists.denx.de/pipermail/u-boot/2020-December/435295.html
Patch for the upstream Linux DTS has been already submitted: https://lore.kernel.org/linux-amlogic/20201218102228.16211-1-m.szyprowski@sa...
arch/arm/dts/meson-sm1-odroid-c4-u-boot.dtsi | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/arch/arm/dts/meson-sm1-odroid-c4-u-boot.dtsi b/arch/arm/dts/meson-sm1-odroid-c4-u-boot.dtsi index c431988075..fbcc8287c5 100644 --- a/arch/arm/dts/meson-sm1-odroid-c4-u-boot.dtsi +++ b/arch/arm/dts/meson-sm1-odroid-c4-u-boot.dtsi @@ -11,3 +11,7 @@ snps,reset-delays-us = <0 10000 1000000>; snps,reset-active-low; };
+&tflash_vdd {
- gpio = <&gpio_ao GPIOAO_3 GPIO_OPEN_DRAIN>;
+};
Acked-by: Neil Armstrong narmstrong@baylibre.com
Applying it to u-boot-amlogic, and will send it asap so it's applied for v2020.10
Neil