[S] Change in coreboot[main]: mb/google/dedede/var/boxy: Wait up for 3s for HPD ready signal

[Reka Norman (Code Review)]

Attention is currently required from: Derek Huang, Joey Peng, Paul Menzel, Stanley Wu.

Reka Norman has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/78146?usp=email )

Change subject: mb/google/dedede/var/boxy: Wait up for 3s for HPD ready signal
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Patch Set 9:

(1 comment)

File src/mainboard/google/dedede/variants/boxy/ramstage.c:

https://review.coreboot.org/c/coreboot/+/78146/comment/784922d5_d8c776a1 :
PS8, Line 69: 	if (display_init_required()
            : 		&& !gpio_get(GPIO_USB_C0_HPD)) {
            : 		/* This has to be done before FSP-S runs. */
            : 		wait_for_hpd(GPIO_USB_C0_HPD, display_timeout_ms);
            : 	} else if (display_init_required()
            : 		&& !gpio_get(GPIO_USB_C1_HPD)) {
            : 		/* This has to be done before FSP-S runs. */
            : 		wait_for_hpd(GPIO_USB_C1_HPD, display_timeout_ms);
            : 	}
> Done

The code above would still add an unconditional 3s delay when only C1 is connected right? I think it's better to wait for all HPD signals at the same time.

I've uploaded a CL for all dibbi variants here: https://review.coreboot.org/c/coreboot/+/78294. Please test it on boxy.