Hi Neil,
On 18.12.2020 10:24, Neil Armstrong wrote:
On 18/12/2020 10:11, Marek Szyprowski wrote:
On 18.12.2020 09:36, Neil Armstrong wrote:
On 17/12/2020 10:06, Marek Szyprowski wrote:
For the proper reboot Odroid C4 board requires to switch TFLASH_VDD_EN pin to the input (high impedance?) mode, otherwise the board is stuck in the middle of loading early stages of the bootloader from SD card.
Did you try taking the regulator-tflash_vdd and doing a disable/enable sequence to reset the card ?
The GPIOAO_3 has a default pull-up, so I don't see why moving it to input could change anything.
So maybe simply doing a 0->1 transition could do the same, using the regulator would be much better.
Can't we add "shutdown" or equivalent method to the mmc driver that could do this directly with the vdd regulator ?
Yes, I've tried all combinations of playing this that GPIO and regulator that came to my mind. Switching pin to the input is the only one I've found working.
Thanks for the dumps !
Could you try switching the tflash_vdd to opendrain like :
--->8---
--- a/arch/arm/dts/meson-sm1-odroid-c4.dts +++ b/arch/arm/dts/meson-sm1-odroid-c4.dts @@ -52,7 +52,7 @@ regulator-min-microvolt = <3300000>; regulator-max-microvolt = <3300000>;
gpio = <&gpio_ao GPIOAO_3 GPIO_ACTIVE_HIGH>;
gpio = <&gpio_ao GPIOAO_3 GPIO_OPEN_DRAIN>; enable-active-high; regulator-always-on; };--->8---
This should leave the pin in input to achieve high state, and solve the issue.
Right, this fixed the issue! Thanks!
Do you want me to submit it as a patch to uboot and mainline Linux kernel or do you want to handle it by yourself?
Best regards