IMX6Q opengl es not smooth while dual display

[jiejia]

There are two screen in our board. One is hdmi(1280x1024P-60 32bpp), another is lvds(1280x1024P-60 32bpp).  When we try to render to one of the screen, it's smooth(export FB_MULTI_BUFFER=2).   Now we need to render different graphics to two screen at the same time, but it's not smooth. 

We create two process, and use 'eglNativeDisplayType = fbGetDisplayByIndex(x);' to render  to /dev/fb0 and /dev/fb2.

[igorpadykov]

Hi jie

one can try kernel boot parameter dmfc=3 as described in

Table 10. Common kernel boot parameters attached Release Notes.

Also one can try to adjust IPU QoS priority configured by IOMUXC_GPR6,7,

it is described in sect.36.4.7 GPR (IOMUXC_GPR6) i.MX6DQ Reference Manual.

Best regards
igor
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[jiejia]

We create two process, and use 'eglNativeDisplayType = fbGetDisplayByIndex(x);' to render  to /dev/fb0 and /dev/fb2. While EGL_WIDTH=1024 and EGL_HEIGHT=1024, it's smooth.  While EGL_WIDTH=1280 and EGL_HEIGHT=1024, it is not smooth.

[jiejia]

thanks for reply. 

   I have try to set dmfc=3, but it has no effect.   

   In out borad, IPU OoS priority value is:   IOMUXC_GPR6--0x007F007F

                                                                   IOMUXC_GPR7--0x007F007F

                                                                    IOMUXC_GPR4--0xF00000CF

  I think this is cause by this function: eglSwapBuffers.  Is there any solution to improve the perference of GPU  or to make eglSwapBuffers run faster?