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Currently when booting the kernel on i.MX8 U-Boot hangs in an
endless loop when switching off dma, connectivity or lsio power
domains during device removal. It hapens first when removing
gpio0 (gpio@5d080000) device, here its power domain device
'lsio_gpio0' is obtained for switching off power. Since the
obtained 'lsio_gpio0' device is removed afterwards, its power
domain is also switched off and here the parent power domain
device 'lsio_power_domain' is optained for switching off the
power. Thereafter, when the obtained 'lsio_power_domain' is
removed, device_remove() removes its first child 'lsio_gpio0'.
During this child removal the 'lsio_power_domain' device is
obtained again for switching and when removing it later,
the same child removal is repeated, so we are stuck in an
endless loop. Below is a snippet from dm tree on i.MX8QXP
for better illustration of the DM devices relationship:
Class Index Probed Driver Name
-----------------------------------------------------------
root 0 [ + ] root_driver root_driver
...
simple_bus 0 [ + ] generic_simple_bus |-- imx8qx-pm
power_doma 0 [ + ] imx8_power_domain | |-- lsio_power_domain
power_doma 1 [ + ] imx8_power_domain | | |-- lsio_gpio0
power_doma 2 [ + ] imx8_power_domain | | |-- lsio_gpio1
Do not remove a power domain device if it is a parent of the
currently controlled device.
Fixes:
|
||
|---|---|---|
| .. | ||
| bcm6328-power-domain.c | ||
| imx8-power-domain-legacy.c | ||
| imx8-power-domain.c | ||
| imx8m-power-domain.c | ||
| Kconfig | ||
| Makefile | ||
| meson-ee-pwrc.c | ||
| meson-gx-pwrc-vpu.c | ||
| mtk-power-domain.c | ||
| power-domain-uclass.c | ||
| sandbox-power-domain-test.c | ||
| sandbox-power-domain.c | ||
| tegra186-power-domain.c | ||
| ti-sci-power-domain.c | ||