mailbox: bcm2835: Fix timeout during suspend mode

In the Linux kernel, the following vulnerability has been resolved:

mailbox: bcm2835: Fix timeout during suspend mode

During noirq suspend phase the Raspberry Pi power driver suffer of

firmware property timeouts. The reason is that the IRQ of the underlying

BCM2835 mailbox is disabled and rpi_firmware_property_list() will always

run into a timeout [1].

Since the VideoCore side isn't consider as a wakeup source, set the

IRQF_NO_SUSPEND flag for the mailbox IRQ in order to keep it enabled

during suspend-resume cycle.

[1]

PM: late suspend of devices complete after 1.754 msecs

WARNING: CPU: 0 PID: 438 at drivers/firmware/raspberrypi.c:128

rpi_firmware_property_list+0x204/0x22c

Firmware transaction 0x00028001 timeout

Modules linked in:

CPU: 0 PID: 438 Comm: bash Tainted: G C 6.9.3-dirty #17

Hardware name: BCM2835

Call trace:

unwind_backtrace from show_stack+0x18/0x1c

show_stack from dump_stack_lvl+0x34/0x44

dump_stack_lvl from __warn+0x88/0xec

__warn from warn_slowpath_fmt+0x7c/0xb0

warn_slowpath_fmt from rpi_firmware_property_list+0x204/0x22c

rpi_firmware_property_list from rpi_firmware_property+0x68/0x8c

rpi_firmware_property from rpi_firmware_set_power+0x54/0xc0

rpi_firmware_set_power from _genpd_power_off+0xe4/0x148

_genpd_power_off from genpd_sync_power_off+0x7c/0x11c

genpd_sync_power_off from genpd_finish_suspend+0xcc/0xe0

genpd_finish_suspend from dpm_run_callback+0x78/0xd0

dpm_run_callback from device_suspend_noirq+0xc0/0x238

device_suspend_noirq from dpm_suspend_noirq+0xb0/0x168

dpm_suspend_noirq from suspend_devices_and_enter+0x1b8/0x5ac

suspend_devices_and_enter from pm_suspend+0x254/0x2e4

pm_suspend from state_store+0xa8/0xd4

state_store from kernfs_fop_write_iter+0x154/0x1a0

kernfs_fop_write_iter from vfs_write+0x12c/0x184

vfs_write from ksys_write+0x78/0xc0

ksys_write from ret_fast_syscall+0x0/0x54

Exception stack(0xcc93dfa8 to 0xcc93dff0)

[...]

PM: noirq suspend of devices complete after 3095.584 msecs