[M] Change in coreboot[main]: mb/google/nissa/var/teliks: Match VBT with SSFC

[Qinghong Zeng (Code Review)]

Attention is currently required from: Dinesh Gehlot, Jayvik Desai, Kapil Porwal, Nick Vaccaro, Qinghong Zeng, Weimin Wu.

Hello Dinesh Gehlot, Eric Lai, Jayvik Desai, Jianeng Ceng, Kapil Porwal, Nick Vaccaro, Paul Menzel, Subrata Banik, Weimin Wu, build bot (Jenkins),

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/84871?usp=email

to look at the new patch set (#16).

Change subject: mb/google/nissa/var/teliks: Match VBT with SSFC
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mb/google/nissa/var/teliks: Match VBT with SSFC

We want to configure different VBT timings for panels of different sizes
and distinguish them through SSFC. We select the reserved bit 6 of SSFC
as the flag bit. When using a 12-inch panel, set this bit to 0; when
using an 11-inch panel, set this bit to 1.
Without splitting, the platform_BootPerf test will fail.

BUG=b:374428465
TEST=
1. can match VBT with SSFC
-When SSFC is set to 0x40:
$ cat /sys/firmware/log | grep vbt
Bit 6 of SSFC is 1, use vbt-teliks_panel_11_inch.bin
CBFS: Found 'vbt-teliks_panel_11_inch.bin' @0x1c6140 size 0x50f in mcache @0x76adda14

-When SSFC is set to 0x0:
$ cat /sys/firmware/log | grep vbt
Bit 6 of SSFC is 0, use vbt-teliks.bin
CBFS: Found 'vbt-teliks.bin' @0x1c5bc0 size 0x50e in mcache @0x76add9b0

2. can pass platform_BootPerf test
The platform_BootPerf time measured for all SKUs is less than 1.55s.

Change-Id: Ia8fb45aede5ead4826d983760506c366a70643ee
Signed-off-by: Qinghong Zeng 
---
M src/mainboard/google/brya/variants/teliks/variant.c
1 file changed, 58 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/71/84871/16