Change in coreboot[master]: sb/amd/pi/hudson/early_init: fix setting SPI_USE_SPI100 in SPI100_ENABLE

[Felix Held (Code Review)]

Attention is currently required from: Michał Kopeć, Felix Held.
Hello build bot (Jenkins), Michał Żygowski, Michał Kopeć,

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

https://review.coreboot.org/c/coreboot/+/59934

to look at the new patch set (#2).

Change subject: sb/amd/pi/hudson/early_init: fix setting SPI_USE_SPI100 in SPI100_ENABLE
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sb/amd/pi/hudson/early_init: fix setting SPI_USE_SPI100 in SPI100_ENABLE

Use a read modify write sequence when setting the SPI_USE_SPI100 bit in
the SPI100_ENABLE register. This avoids clearing other bits in the
register which might cause instabilities. Haven't checked the reference
code, but the register descriptions suggested that the register in
Mullins behaves similar to the one in Stoneyridge. Right now this code
is unused, but it's probably still a good idea to fix it.

TEST=None

Signed-off-by: Felix Held 
Change-Id: Ifbd960a9509542b28f03326a3066995540260bef
---
M src/southbridge/amd/pi/hudson/early_setup.c
1 file changed, 2 insertions(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/34/59934/2