[XS] Change in coreboot[main]: soc/mediatek/mt8196: Add delay in pmif_spmi.c

[Hope Wang (Code Review)]

Attention is currently required from: Hung-Te Lin, Jarried Lin, Yidi Lin, Yu-Ping Wu.

Hope Wang has posted comments on this change by Jarried Lin. ( https://review.coreboot.org/c/coreboot/+/85799?usp=email )

Change subject: soc/mediatek/mt8196: Add delay in pmif_spmi.c
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Patch Set 3:

(1 comment)

Commit Message:

https://review.coreboot.org/c/coreboot/+/85799/comment/9ea9956a_a9e7c4d8?usp... :
PS2, Line 7: Add delay in pmif_spmi.c
> Can we be more specific? For example, `Delay 0.5ms before enabling cmd issue`. […]

The 500 microseconds delay is implemented to ensure that the two fields, inf_en and arb_en of the PMIF can be written successfully. 
write32(&arb->mtk_pmif->inf_en, PMIF_SPMI_SW_CHAN);
write32(&arb->mtk_pmif->arb_en, PMIF_SPMI_SW_CHAN);