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##
## This file is part of the coreboot project.
##
## Copyright 2013 Google Inc.
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; version 2 of the License.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program; if not, write to the Free Software
## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
##
chip soc/nvidia/tegra124
device cpu_cluster 0 on end
# N.B. We ae not using the device tree in an effective way.
# We need to change this in future such that the on-soc
# devices are 'chips', which will allow us to go at them
# in parallel. This is even easier on the ARM SOCs since there
# are no single-access resources such as the infamous
# cf8/cfc registers found on PCs.
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"
register "cache_policy" = "DCACHE_WRITETHROUGH"
# With some help from the mainbaord designer
register "backlight_en_gpio" = "GPIO(H2)"
register "lvds_shutdown_gpio" = "0"
register "backlight_vdd_gpio" = "GPIO(P2)"
register "panel_vdd_gpio" = "0"
register "pwm" = "GPIO(H1)"
# 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"
# How to compute these: xrandr --verbose will give you this:
#Detailed mode: Clock 285.250 MHz, 272 mm x 181 mm
# 2560 2608 2640 2720 hborder 0
# 1700 1703 1713 1749 vborder 0
#Then you can compute your values:
#H front porch = 2608 - 2560 = 48
#H sync = 2640 - 2608 = 32
#H back porch = 2720 - 2640 = 80
#V front porch = 1703 - 1700 = 3
#V sync = 1713 - 1703 = 10
#V back porch = 1749 - 1713 = 36
#href_to_sync and vref_to_sync are from the vendor
#this is just an example for a Pixel panel; other panels differ.
# Here is a peppy panel:
# 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 "vref_to_sync" = "1"
register "vfront_porch" = "6"
register "vsync_width" = "8"
register "vback_porch" = "6"
# we *know* the pixel clock for this system.
register "pixel_clock" = "71"
end
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