t124: Clean up display init functions

The existing display init functions were translated from a script. The new
code will play the same functions but are cleaner and readable and easier to
be ported to new panel.

BUG=none
TEST=build nyan and boot up kernel.

Signed-off-by: Jimmy Zhang <jimmzhang@nvidia.com>

Original-Change-Id: Ic9983e57684a03e206efe3731968ec62905f4ee8
Original-Reviewed-on: https://chromium-review.googlesource.com/189518
Original-Commit-Queue: Jimmy Zhang <jimmzhang@nvidia.com>
Original-Tested-by: Jimmy Zhang <jimmzhang@nvidia.com>
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
(cherry picked from commit 5998f991ea3069d603443b93c2ebdcdcd04af961)
Signed-off-by: Marc Jones <marc.jones@se-eng.com>

Squashed to pass abuild

nyan: Fix the build for big and blaze.

The display code for the tegra124 was cleaned up recently, but only the nyan
device tree was updated to match the new code, not big's or blaze's. This
change copies nyan's device tree over to those other two boards which will get
them building again. The settings may not be correct, but they'll be no less
correct than they were before. I also updated the copyright date for nyan.

BUG=none
TEST=Built for nyan, nyan_big, nyan_blaze. Booted on nyan_big and verified the
panel wasn't damaged by the new display code or settings.
BRANCH=None

Original-Change-Id: I75055a01f9402b3a9de9a787a9d3e737d25bb515
Original-Signed-off-by: Gabe Black <gabeblack@google.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/191364
Original-Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Original-Commit-Queue: Gabe Black <gabeblack@chromium.org>
Original-Tested-by: Gabe Black <gabeblack@chromium.org>
(cherry picked from commit ea235f23df31b4ca8006dcdf3628eed096e062b9)
Signed-off-by: Marc Jones <marc.jones@se-eng.com>

Change-Id: Icdad74bf2d013c3677e1a3373b8f89fad99f616e
Reviewed-on: http://review.coreboot.org/7454
Tested-by: build bot (Jenkins)
Reviewed-by: David Hendricks <dhendrix@chromium.org>

1 files changed, 40 insertions, 19 deletions

diff --git a/src/mainboard/google/nyan_big/devicetree.cb b/src/mainboard/google/nyan_big/devicetree.cb
index 9541ce9c9d..bf6c7f3bb3 100644
--- a/src/mainboard/google/nyan_big/devicetree.cb
+++ b/src/mainboard/google/nyan_big/devicetree.cb
@@ -28,9 +28,14 @@ chip soc/nvidia/tegra124
 	register "display_controller" = "TEGRA_ARM_DISPLAYA"
 	register "xres" = "1366"
 	register "yres" = "768"
-	# this setting is what nvidia does; it makes no sense
-	# and does not agree with hardware. Why'd they do it?
-	register "framebuffer_bits_per_pixel" = "18"
+
+	# bits per pixel and color depth
+	register "framebuffer_bits_per_pixel" = "16"
+	register "color_depth" = "6"
+	# "6" is defined as COLOR_DEPTH_B5G6R5 in dc_reg.h
+
+	register "panel_bits_per_pixel" = "18"
+
 	register "cache_policy" = "DCACHE_WRITETHROUGH"
 
 	# With some help from the mainbaord designer
@@ -40,12 +45,12 @@ chip soc/nvidia/tegra124
 	register "panel_vdd_gpio" = "0"
 	register "pwm" = "1"
 
-# taken from u-boot; these look wrong however.
-	register "vdd_delay" = "400"
-	register "vdd_data_delay" = "4"
-	register "data_backlight_delay" = "203"
-	register "backlight_pwm_delay" = "17"
-	register "pwm_backlight_en_delay" = "15"
+	# various panel delay time
+	register "vdd_delay_ms" = "200"
+	register "vdd_to_hpd_delay_ms" = "200"
+	register "hpd_unplug_min_us" = "2000"
+	register "hpd_plug_min_us" = "250"
+	register "hpd_irq_min_us" = "250"
 
 # How to compute these: xrandr --verbose will give you this:
 #Detailed mode: Clock 285.250 MHz, 272 mm x 181 mm
@@ -64,17 +69,33 @@ chip soc/nvidia/tegra124
 #  1366x768 (0x45)   76.4MHz -HSync -VSync *current +preferred
 #        h: width  1366 start 1502 end 1532 total 1592
 #        v: height  768 start  776 end  788 total  800
-# These numbers were provided by Nvidia.
-	register "href_to_sync" = "1"
-	register "hfront_porch" = "44"
-	register "hsync_width" = "46"
-	register "hback_porch" = "44"
+	register "href_to_sync" = "68"
+	register "hfront_porch" = "136"
+	register "hsync_width" = "30"
+	register "hback_porch" = "60"
 
-	register "vref_to_sync" = "1"
-	register "vfront_porch" = "6"
-	register "vsync_width" = "8"
-	register "vback_porch" = "6"
+	register "vref_to_sync" = "4"
+	register "vfront_porch" = "8"
+	register "vsync_width" = "12"
+	register "vback_porch" = "12"
 
 	# we *know* the pixel clock for this system.
-	register "pixel_clock" = "71"
+	# 1592 x 800 x 60Hz = 76416000
+	register "pixel_clock" = "76416000"
+	register "pll_div" = "2"
+
+	# use plld_out0 (ie, plld/2) as clock source
+	#  plld -> plld_out0 -> pclk
+	#  plld = plld_out0 * 2 = (pclk * pll_div) * 2
+	#       = 305664000Hz
+
+	# link configurations
+	register "lane_count" = "1"
+	register "enhanced_framing" = "1"
+	register "link_bw" = "10"
+	# "10" is defined as SOR_LINK_SPEED_G2_7 in sor.h
+
+	register "drive_current" = "0x13131313"
+	register "preemphasis" = "0x00000000"
+	register "postcursor" = "0"
 end