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Difference between revisions of "Rock/display"

(set display scale)
(set HDMI output mode)
Line 16: Line 16:
  
 
=== set HDMI output mode ===
 
=== set HDMI output mode ===
    ''root@radxa:~#'' '''cd /sys/class/display/display0.HDMI'''
 
 
you can see supported output modes by the following commands:
 
you can see supported output modes by the following commands:
     ''root@radxa:/sys/class/display/display0.HDMI#'' '''cat modes'''
+
     root@radxa:# cat /sys/class/display/display0.HDMI/modes  
 
     1920x1080p-60
 
     1920x1080p-60
 
     1920x1080p-50
 
     1920x1080p-50
Line 26: Line 25:
 
     720x480p-60
 
     720x480p-60
 
check out the current display mode
 
check out the current display mode
     ''root@radxa:/sys/class/display/display0.HDMI#'' '''cat mode'''
+
     root@radxa:# cat /sys/class/display/display0.HDMI/mode
 
     1280x720p-60
 
     1280x720p-60
 
It's 720p@60hz
 
It's 720p@60hz
  
 
change the mode to 1080p@60hz
 
change the mode to 1080p@60hz
     ''root@radxa:/sys/class/display/display0.HDMI#'' '''echo 1920x1080p-60 > mode'''
+
     root@radxa:# echo 1920x1080p-60 > /sys/class/display/display0.HDMI/mode

Revision as of 13:03, 9 March 2014

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 display related stuff. The following should work on both Android and Linux.


set display scale

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

set HDMI output mode

you can see supported output modes by the following commands:

   root@radxa:# cat /sys/class/display/display0.HDMI/modes 
   1920x1080p-60
   1920x1080p-50
   1280x720p-60
   1280x720p-50
   720x576p-50
   720x480p-60

check out the current display mode

   root@radxa:# cat /sys/class/display/display0.HDMI/mode
   1280x720p-60

It's 720p@60hz

change the mode to 1080p@60hz

   root@radxa:# echo 1920x1080p-60 > /sys/class/display/display0.HDMI/mode