[Intel-gfx] [PATCH] drm/i915: Disable preemption and sleeping while using the punit sideband

[youling257]

Cherry trail no this problem? sure?
my z8350 ezpad always hang freeze on kernel 5.4/5.5/5.6.
when i bought it,Linux kernel has been 5.4.

v2: Restrict the heavy-weight wakeup to just the ISOF_PORT_PUNIT, there
is insufficient evidence to implicate a wider problem atm. Similarly,
restrict the w/a to Valleyview, as Cherryview doesn't have an angry cadre
of users.

how to make this patch support Cherry trail?