veyron_rialto: Use VOP_MODE_NONE for display init.

This uses VOP_MODE_NONE for display init on veyron_rialto and
adds a mainboard_power_on_backlight() stub so that we can finally
get rid of SKIP_DISPLAY_INIT_HACK.

BUG=none
BRANCH=none
TEST=built for veyron_rialto

Change-Id: Ia6b420a962fe266e773c804b8e5c68da35848753
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: a290c938c163759a3672c07d8ec7c0a38057b13d
Original-Change-Id: Iec2d7f03857198a4d6f7490db1e3e19c74f18c43
Original-Signed-off-by: David Hendricks <dhendrix@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/282048
Reviewed-on: http://review.coreboot.org/10784
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/mainboard/google/veyron_rialto/Kconfig

@@ -63,14 +63,6 @@ config CONSOLE_SERIAL_UART_ADDRESS
 	depends on DRIVERS_UART
 	default 0xFF690000
 
-# FIXME(dhendrix): This is a gross hack intended to get us past
-# display init which currently hangs the machine. It will be removed
-# once we've re-factored the display init code to properly handle
-# various types of displays.
-config SKIP_DISPLAY_INIT_HACK
-	int
-	default 1
-
 config PMIC_BUS
 	int
 	default 0

src/mainboard/google/veyron_rialto/devicetree.cb

@@ -21,5 +21,6 @@
 chip soc/rockchip/rk3288
 	device cpu_cluster 0 on end
 	register "vop_id" = "1"
+	register "vop_mode" = "VOP_MODE_NONE"
 	register "framebuffer_bits_per_pixel" = "16"
 end

src/mainboard/google/veyron_rialto/mainboard.c

@@ -108,4 +108,5 @@ void lb_board(struct lb_header *header)
 
 void mainboard_power_on_backlight(void)
 {
+	return;
 }