Rock/display

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The cpu of Radxa Rock - RK3188 has two LCD controllers, LCD0 and LCD1. On RR, LCD1 is connected to HDMI and LCD0 is connect to AV out and the LCD0 signal are also exported on the extension header.

There is some sysfs interface exported to control the framebuffer under /sys/devices/platform/rk-fb/graphics/

   root@radxa:~# cd /sys/devices/platform/rk-fb/graphics/fb0

• set display scale

   root@radxa:/sys/devices/platform/rk-fb/graphics/fb0# cat scale
   xscale=95 yscale=95
   root@radxa:/sys/devices/platform/rk-fb/graphics/fb0# echo xscale=100 > scale     
   root@radxa:/sys/devices/platform/rk-fb/graphics/fb0# echo yscale=100 > scale     
   root@radxa:/sys/devices/platform/rk-fb/graphics/fb0# cat scale
   xscale=100 yscale=100