tree fe41edd638e01f5ab68ddf2c482d8221273da6c7
parent 355fb2fb984cc264f4452d4bbffbd3666c71906e
author Ren Kuo <ren.kuo@quanta.corp-partner.google.com> 1640169763 +0800
committer Nico Huber <nico.h@gmx.de> 1641046827 +0000

mb/google/dedede/var/magolor: Set core display clock to 172.8 MHz

When using the default initial core display clock frequency, Magolor has
a rare stability issue where the startup of Chrome OS in secure mode may
hang. Slowing the initial core display clock frequency down to 172.8 MHz
as per Intel recommendation avoids this problem.

Depend on CL: https://review.coreboot.org/c/coreboot/+/60009
The CdClock=0xff is set in dedede baseboard,and we overwrite it as 0x0
(172.8 MHz) for magolor.

BUG=b:206557434
BRANCH=dedede
TEST=Build firmware and verify on fail DUTs.
     Check the DUTs can boot up in secure mode well.

Change-Id: I5a0ad2bed79b37775184f0bd0a0ef024900cbe34
Signed-off-by: Ren Kuo <ren.kuo@quanta.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/60301
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>