rockchip: edp: Meet a problem with supporting eDP panel at firefly release

[ayaka]

Hello:

I meet a problem when I want to add support for a lg,lp079qx1-sp0v eDP 
panel at firefly release rk3288 platform. I could hardly make the eDP 
work both on firefly release and firefly reload. Does you have any idea 
about that?

[   11.136586] i2c i2c-6: of_i2c: modalias failure on /dp at ff970000/ports
[   11.143127] i2c i2c-6: Failed to create I2C device for /dp at ff970000/ports
[   11.150288] rockchip-drm display-subsystem: bound ff970000.dp (ops 
rockchip_dp_component_ops [analogix_dp_rockchip])
[   11.160944] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[   11.167645] [drm] No driver support for vblank timestamp query.
[  OK  ] Started LSB: Load kernel modules needed to enable cpufreq scaling.
[   11.205908] rockchip-drm display-subsystem: fb0:  frame buffer device
[   11.221525] [drm] Initialized rockchip 1.0.0 20140818 for 
display-subsystem on minor 0
[   11.275427] rockchip-dp ff970000.dp: AUX CH command reply failed!
[  OK  ] Created slice system-systemd\x2dbacklight.slice.
          Starting Load/Save Screen Backlight...htness of 
backlight:backlight...
          Starting LSB: set CPUFreq kernel parameters...
[   11.450557] rockchip-dp ff970000.dp: Rx Max Link Rate is abnormal :20 !
[   11.457274] rockchip-dp ff970000.dp: Rx Max Lane count is abnormal :0 !
[   11.480023] rockchip-dp ff970000.dp: AUX CH command reply failed!
[   11.532742] rockchip-dp ff970000.dp: AUX CH command reply failed!
[   11.595626] rockchip-dp ff970000.dp: LT link start failed!
[   11.601167] rockchip-dp ff970000.dp: eDP link training failed (-121)
[  OK  ] Started Load/Save Screen Backlight Brightness of 
backlight:backlight.
[   11.622300] rockchip-dp ff970000.dp: AUX CH command reply failed!
[   11.637980] rockchip-dp ff970000.dp: AUX CH command reply failed!
[   11.667878] rockchip-dp ff970000.dp: AUX CH command reply failed!