[coreboot-gerrit] Change in coreboot[master]: mainboard/hatch: Fix puff display on cold boots (WIP)

[Edward O'Callaghan (Code Review)]

Edward O'Callaghan has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/38475 )

Change subject: mainboard/hatch: Fix puff display on cold boots (WIP)
......................................................................

mainboard/hatch: Fix puff display on cold boots (WIP)

BUG=b:XXX
BRANCH=none
TEST=none

Change-Id: I19d40056e58f1737f87fd07d62b07a723a63d610
Signed-off-by: Edward O'Callaghan 
---
M src/mainboard/google/hatch/variants/puff/mainboard.c
1 file changed, 39 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/75/38475/1

diff --git a/src/mainboard/google/hatch/variants/puff/mainboard.c b/src/mainboard/google/hatch/variants/puff/mainboard.c
index 9c2b5fb..cc1dd39 100644
--- a/src/mainboard/google/hatch/variants/puff/mainboard.c
+++ b/src/mainboard/google/hatch/variants/puff/mainboard.c
@@ -15,9 +15,48 @@

#include <baseboard/variants.h>
 #include <chip.h>
+#include <gpio.h>
 #include <device/device.h>
 #include <ec/google/chromeec/ec.h>

+#define GPIO_HDMI_HPD		GPP_E13
+#define GPIO_DP_HPD		GPP_E14
+
+/* TODO: This can be moved to common directory */
+static void wait_for_hpd(gpio_t gpio, long timeout)
+{
+	struct stopwatch sw;
+
+	printk(BIOS_INFO, "Waiting for HPD\n");
+	gpio_input(gpio);
+
+	stopwatch_init_msecs_expire(&sw, timeout);
+	while (!gpio_get(gpio)) {
+		if (stopwatch_expired(&sw)) {
+			printk(BIOS_WARNING,
+			       "HPD not ready after %ldms. Abort.\n", timeout);
+			return;
+		}
+		mdelay(200);
+	}
+	printk(BIOS_INFO, "HPD ready after %lu ms\n",
+	       stopwatch_duration_msecs(&sw));
+}
+
+void variant_ramstage_init(void)
+{
+	static const long display_timeout_ms = 3000;
+
+	/* This is reconfigured back to whatever FSP-S expects by
+	   gpio_configure_pads. */
+	gpio_input(GPIO_HDMI_HPD);
+	if (display_init_required() && !gpio_get(GPIO_HDMI_HPD)) {
+		/* This has to be done before FSP-S runs. */
+		if (google_chromeec_wait_for_displayport(display_timeout_ms))
+			wait_for_hpd(GPIO_DP_HPD, display_timeout_ms);
+	}
+}
+
 /*
  * For type-C chargers, set PL2 to 90% of max power to account for
  * cable loss and FET Rdson loss in the path from the source.