imx6Q framebuffer

jieh朱 — Fri, 12 Oct 2018 08:06:54 GMT

Hello there
I now use imx6Q screen resolution is 1024 * 600, the application layer can read the framebuffer size through ioctl (FBIOGET_FSCREENINFO), I can modify the size of the framebuffer in the kernel state. If I can, how can I operate?

Re: imx6Q framebuffer

Bio_TICFSL — Tue, 16 Oct 2018 16:55:23 GMT

Hi jieh,

The xrandr implementation has to do all the scaling and rotating in the  X/gpu graphic drivers without frame buffer driver involve  http://en.wikipedia.org/wiki/RandR http://cgit.freedesktop.org/xorg/proto/randrproto/tree/randrproto.txt  As example:  If the size is too small (240x240), XRandR can be used to define a new mode.  1. Get the output name:   root@imx6qsabresd:~# xrandr  Screen 0: minimum 240 x 240, current 240 x 320, maximum 8192 x 8192  DISP4 FG connected 240x320+0+0 (normal left inverted right x axis y axis) 0mm x 0mm  U:240x320p-60 60.0*  2. Define a new mode:   root@imx6qsabresd:~# xrandr --newmode "640x480R" 23.50 640 688 720 800 480 483 487 494 +hsync -vsync  3. Add the newly created mode:   root@imx6qsabresd:~# xrandr --addmode "DISP4 FG" 640x480R  4. Check the modes:   root@imx6qsabresd:~# xrandr  Screen 0: minimum 240 x 240, current 240 x 320, maximum 8192 x 8192  DISP4 FG connected 240x320+0+0 (normal left inverted right x axis y axis) 0mm x 0mm  U:240x320p-60 60.0*  640x480R 59.5    5. Switch to a new mode:  root@imx6qsabresd:~# xrandr -s 640x480 NOTE:  The overlay size cannot exceed the display size. For example, if LVDS is 1024x768,  the overlay size cannot be larger than this.  • Timings for overlay are meaningless, but wrong timings may damage your display,  so be careful when creating a new display mode for your display. • If fb3 is used, fb2 must be enabled. Otherwise, fb3 is invisible

Regards

Re: imx6Q framebuffer

jieh朱 — Wed, 17 Oct 2018 01:44:26 GMT

thank you for your reply
I may not be clear enough. The frame buffer size is 1024*600*16/8 at a resolution of 1024*600, without changing the resolution. Then you can change the frame buffer size to 1024*600*16/8*2

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