I need to clarify my question.
For Broadwell-U, are there internal 3 display ports? Is the first one set
statically as eDP?
How can these ports be set as other type like VGA, HDMI?
Can all these 3 ports be enabled at same time?
Zheng
________________________________
From: coreboot <coreboot-boun...@coreboot.org> on behalf of Zheng Bao
<fishb...@hotmail.com>
Sent: Wednesday, August 2, 2017 6:35 AM
To: coreboot@coreboot.org
Subject: [coreboot] [Broadwell-U]How the eDP, DDI1, DDI2 are enabled?
---------------------------------
# Enable eDP Hotplug with 6ms pulse
register "gpu_dp_d_hotplug" = "0x06"
# Enable DDI1 Hotplug with 6ms pulse
register "gpu_dp_b_hotplug" = "0x06"
# Enable DDI2 Hotplug with 6ms pulse
register "gpu_dp_c_hotplug" = "0x06"
# Set backlight PWM values for eDP
register "gpu_cpu_backlight" = "0x00000200"
register "gpu_pch_backlight" = "0x04000200"
# Enable Panel and configure power delays
register "gpu_panel_port_select" = "1" # eDP
register "gpu_panel_power_cycle_delay" = "6" # 500ms
register "gpu_panel_power_up_delay" = "2000" # 200ms
register "gpu_panel_power_down_delay" = "500" # 50ms
register "gpu_panel_power_backlight_on_delay" = "2000" # 200ms
register "gpu_panel_power_backlight_off_delay" = "2000" # 200ms
---------------------------------------
I assume SOC has 3 display port, called eDP, DDI1 and DDI2.
The code above enable eDP only. How are the DDI1 and DDI2 enabled?
Zheng
--
coreboot mailing list: coreboot@coreboot.org
https://mail.coreboot.org/mailman/listinfo/coreboot
