screen goes black while mouse move

[linzhang]

a problem of display.

I have done following steps to overlay fb1 on fb0:

1. set the geometry of fb1 to fb0's geometry(ioctl(FBIOPUT_VSCREENINFO)).

2. call ioctl(MXCFB_SET_LOC_ALPHA) on fb1:

    l_alpha.enable = 1;

    l_alpha.alpha_in_pixel = 0;

3. output images to fb1's non-transparent area.

after those, I found that the screen goes black while moving mouse.

if moving stopped, the screen come back, images and controls will display.

how can I fix this bug?

[igorpadykov]

Hi lin

seems there are errors in drivers and one can try to debug them using

AN4553 Using Open Source Debugging Tools for Linux on i.MX Processors

cache.nxp.com/files/32bit/doc/app_note/AN4553.pdf

Best regards

igor

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[linzhang]

and ocassionally, the following erros will be printed repeatedly while moving mouse:

mxc_sdc_fb fb.31: timeout when waiting for flip irq

mxc_sdc_fb fb.31: timeout when waiting for flip irq

mxc_sdc_fb fb.31: timeout when waiting for flip irq

[igorpadykov]

for this error please look at

https://community.freescale.com/message/413087#413087

[linzhang]

I have changed the timeout value from HZ/2 to 4*HZ, but the error still exists。

ret = wait_for_completion_timeout(&mxc_fbi->flip_complete, 4*HZ /*HZ/2*/);