imx8mp soft reboot got stuck in imx-atf

[royhuang9]

Hi,

When the system do a software reset by the watchdog, sometimes ( around 5%) the system got stuck. After some debugging with jtag, we found it got stuck at the while loop in imx-atf:
imx-atf/plat/imx/imx8m/imx8mp/gpc.c, function 

void imx_gpc_pm_domain_enable(uint32_t domain_id, bool on)
{
......
		if (domain_id == HDMIMIX) {
			/* wait for memory repair done for HDMIMIX */
			while (!(mmio_read_32(IMX_SRC_BASE + 0x94) & BIT(8)))

I didn't try the evk, because the evk is doing a cold reboot through pmic which turn off the whole cpu.
We are using the release 5.10.35, but the this piece of code in imx-atf has no difference with the latest version.

The register IMX_SRC_BASE + 0x94 is SRC_GPR9, which is marked as reserved for internal use.

Hope get some help about this.

Best Regard,
Roy Huang


 

[Zhiming_Liu]

Hello @royhuang9 

From your description, do you change the reset part in your desgin?

[royhuang9]

On hardware design of connection between PMIC and imx8mp, we don't change anything. In watchdog's device tree configuration of linux kernel, we removed the "fsl,ext-reset", so the reboot is not a cold reset, but a soft reset. The reboot command triggers a watchdog reset, but the watchdog doesn't send a reset signal to PMIC. The reason is our power circuit need a GPIO high from processor to latch the power, otherwise the whole system is shutdown including the PMIC itself. A cold reset will cause the GPIO to low, and system is off

[Zhiming_Liu]

Have you test this (just remove "fsl,ext-reset") on EVK? If we can reproduce this issue on evk, i will test this and report it on my side