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

[Stanley Wu (Code Review)]

Attention is currently required from: Derek Huang, Joey Peng, Paul Menzel, Reka Norman.

Stanley Wu 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 8:

(4 comments)

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

https://review.coreboot.org/c/coreboot/+/78146/comment/3fbb0e16_4e4498b8 :
PS8, Line 68:
> Are you sure we can get the correct gpio state by get_gpio() without configuring the gpio to input?

new patch 9 for configuring GPIO_HDMI_HPD to input and get correct state.

https://review.coreboot.org/c/coreboot/+/78146/comment/a23b7dcb_df3d0eec :
PS8, Line 70: && !gpio_get(GPIO_USB_C0_HPD)
> this is redundant.

Done

https://review.coreboot.org/c/coreboot/+/78146/comment/1a3b1d97_e45939d9 :
PS8, Line 74: && !gpio_get(GPIO_USB_C1_HPD
> this is redundant

Done

https://review.coreboot.org/c/coreboot/+/78146/comment/b324350c_e033ed5a :
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);
            : 	}
> If only HDMI is connected, these will always timeout and add 6s delay. […]

Upload patch 9 to remove wait_for_hpd() and add 3s delay directly with non-HDMI display case due to Boxy display output only have HDMI or typC port C1/C2 case, and C1/C2 case should waiting 3s for USBC dongle