sysutils/u-boot fix warm reset on Pinebook Pro

Please consider including this patch, it seems common across other
OSes supporting Pinebook Pro and fixes the display issues on warm
reset.

$OpenBSD$

Fix Pinebook Pro display on warm reset.

By Arnaud Patard
http://people.hupstream.com/~rtp/pbp/20200706/patches/hack-reset.patch

Index: board/pine64/pinebook-pro-rk3399/pinebook-pro-rk3399.c
--- board/pine64/pinebook-pro-rk3399/pinebook-pro-rk3399.c.orig
+++ board/pine64/pinebook-pro-rk3399/pinebook-pro-rk3399.c
@@ -7,9 +7,12 @@
#include <common.h>
#include <dm.h>
#include <syscon.h>
+#include <linux/delay.h>
+#include <asm/gpio.h>
#include <asm/io.h>
#include <asm/arch-rockchip/clock.h>
#include <asm/arch-rockchip/grf_rk3399.h>
+#include <asm/arch-rockchip/gpio.h>
#include <asm/arch-rockchip/hardware.h>
#include <asm/arch-rockchip/misc.h>
#include <power/regulator.h>
@@ -59,6 +62,7 @@ int misc_init_r(void)
const u32 cpuid_length = 0x10;
u8 cpuid[cpuid_length];
int ret;
+ unsigned int gpio;

setup_iodomain();

@@ -69,6 +73,11 @@ int misc_init_r(void)
ret = rockchip_cpuid_set(cpuid, cpuid_length);
if (ret)
return ret;
+
+ gpio_lookup_name("B22", NULL, NULL, &gpio);
+ gpio_direction_output(gpio, 0);
+ udelay(500000);
+ gpio_direction_output(gpio, 1);

return ret;
}