google/puff: remove workaround that toggled the #ISOLATE pin

A workaround was added for puff to assert/deassert the #ISOLATE pin
during suspend/resume to resolve the situation where the realtek
ethernet device cannot enter L1.2 mode when its ASPM is disabled.
The realtek driver has since been fixed and ASPM of realtek devices have
been enabled on kernel 5.10 and 5.15 and this original workaround
is now causing suspend/resume errors on kernel 5.15:
r8169 0000:01:00.0: Unable to change power state from D3cold to D0,
device inaccessible

Puff devices were originally shipped with kernel 4.19, and applying
this change to the firmware on a device running 4.19 causes
suspend/resume failures, basically reversing the problem. We are
upreving the puff kernel to 5.15 so we need this patch, but since
it is incompatible with 4.19 we will have to take that into
consideration when pushing new firmware and potentially will need
to backport the necessary fixes to 4.19.

BUG=b:268859220
TEST=suspend_stress_test -c 500 on wyvern

Change-Id: I5eead2d70cd9528b3ca3fadd11f98c0330601324
Signed-off-by: Alexis Savery <asavery@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/77378
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Sam McNally <sammc@google.com>

0 files changed, 0 insertions, 0 deletions