[coreboot-gerrit] Change in coreboot[master]: chromeec: Depend on events_copy_b to identify the wake source

[Matt DeVillier (Code Review)]

Matt DeVillier has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/34801 )

Change subject: chromeec: Depend on events_copy_b to identify the wake source
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Patch Set 6:

this change breaks resume from S3 on older ChromeEC platforms which use alt_gp_smi_en (Haswell/Broadwell at least), in the case where there are multiple events in the primary EC event queue on resume.

EG, if device is suspended and then lid closed, on lid open the device will attempt to resume from S3, then immediately return to S3 once the alt_gp_smi_en register is set (in the LPC init code). If the alt_gp_smi_en register is not used (val 0x0000), or this change is partially reverted to still clear the primary event queue, then there is no issue.