framebuffer - image appear and disappear

Dear Ran,
Can you please create "/etc/fb.modes" file and put your timing info then try it.

Ex:

/etc/fb.modes

mode "640x480-60"
# D: 25.200 MHz, H: 31.500 kHz, V: 60.001 Hz
geometry 640 480 640 960 32
timings 39682 48 16 33 10 96 2
rgba 8/16,8/8,8/0,8/24
endmode


mode "768x576-75"
# D: 49.188 MHz, H: 46.580 kHz, V: 75.008 Hz
geometry 768 576 768 1152 32
timings 20330 128 32 32 8 128 5
accel true
rgba 8/16,8/8,8/0,8/24
endmode

ex: fbset <name>
fbset 640x480-60


Did you check after set VPSS timing via cat ?
cat /sys/devices/platform/vpss/display1/timings

Hi Titus,

I get the following error:

root@dm814x:/opt/dvr_rdk/ti814x/bin# fbset 640x480-60

/etc/fb.modes:5: syntax error

>Did you check after set VPSS timing via cat ?

Yes :

root@dm814x:/opt/dvr_rdk/ti814x/bin# cat /sys/devices/platform/vpss/display1/timings

6500,320/1/22/2,240/2/1/1,1

root@dm814x:/opt/dvr_rdk/ti814x/bin#

Regards,

Ran

Ran,

Please refer to the below pointers regarding psplash usage:

processors.wiki.ti.com/.../Customizing_the_SDK_Splash_Screen
processors.wiki.ti.com/.../Sitara_Linux_Training:_Boot_Time_Reduction_Update

e2e.ti.com/.../252706
e2e.ti.com/.../98365
e2e.ti.com/.../89667
e2e.ti.com/.../440747
e2e.ti.com/.../272688

BR
Pavel

Hi Pavel,

Thank you for the links but non of them yet helped me with the rhis problem.
seems that though vpss is configured, I need to configure the fbdev framework ?

I know that in other project (omap3530) , with other linux, but same disaply that the framebuffer was configured in such a way that when doing fbset -fb /dev/fb0 I get the following:

mode "240x320-0"
# D: 0.000 MHz, H: 0.000 kHz, V: 0.000 Hz
geometry 240 320 240 320 16
timings 0 0 0 0 0 0 0
accel false
rgba 5/11,6/5,5/0,0/0
endmode

Though I don't know how they configured it (I have no source code and see no script which configure fb, so I quite don't know)
I suspect that the zeros in the timing line is what I need, but I don't know how to do it.

Regards,
Ran

Ran,

have you checked the below two wiki pages?

processors.wiki.ti.com/.../TI81XX_PSP_VPSS_Video_Driver_User_Guide

processors.wiki.ti.com/.../TI81XX_PSP_VIDEO_CAPTURE_Driver_User_Guide

BR
Pavel

Hi Pavel,

Thanks for the links.
I read them, but still not sure what is the problem.
Do I need to configure fbdev (with /dev/fb.modes or using fbset) or is it suffecient to configure vpss ?

I'm not sure why I see the following:
root@dm814x:/opt/dvr_rdk/ti814x/bin# fbset -fb /dev/fb0

mode "1920x273-212"
# D: 148.500 MHz, H: 67.500 kHz, V: 212.264 Hz
geometry 1920 273 1920 273 32
timings 6734 148 88 36 4 44 5
rgba 8/16,8/8,8/0,8/24
endmode

Regards,
Ran

Ran,

This is what I have on the DM814x TI EVM, can you try this?

root@dm814x-evm:~# echo 0 > /sys/devices/platform/vpss/display1/enabled
root@dm814x-evm:~# echo 6500,320/1/22/2,240/2/1/1,1 > /sys/devices/platform/vpss/display1/timings
root@dm814x-evm:~# echo 1 > /sys/devices/platform/vpss/display1/enabled
root@dm814x-evm:~# fbset -xres 320 -yres 240 -vxres 320 -vyres 240
root@dm814x-evm:~# echo 1:dvo2 > /sys/devices/platform/vpss/graphics0/nodes
root@dm814x-evm:~# fbset -fb /dev/fb0

mode "320x240-77"
# D: 6.500 MHz, H: 18.841 kHz, V: 77.216 Hz
geometry 320 240 320 240 32
timings 153846 22 1 1 2 2 1
rgba 8/16,8/8,8/0,8/24
endmode

BR
Pavel

Hi Pavel,

Thank you for the suggestion.

I've tried it, but still don't see anything when using psplash application.

I do see bar generator when output test bar color directly though register setting.

The problem is only with fbdev settings I think.

As if it is not started or configured correctly although vpss is configured (probably) correct according to the bar color.

In my case the width is 240 while the height is 320 (in most cases the width > height but not in our configuration).

Interesting to note that on starting dvrrdk display usecase I can start the psplash, as if the dvrrdk application configure something differently.

Regards,

Ran

I also see printing in dvrrdk application as following:

[FBDEV] Var Screen Info
[FBDEV] ---------------
[FBDEV] Xres - 240
[FBDEV] Yres - 320
[FBDEV] Xres Virtual - 240
[FBDEV] Yres Virtual - 320
[FBDEV] Bits Per Pixel - 16
[FBDEV] Pixel Clk - 18518 <-- while in vpss I configure 6500 !!
[FBDEV] Rotation - 0

I don't understand how it changed.

Regards,
Ran

Ran,

I can not provide much info regarding your dvrrdk application, but you can check if something is overwriting your config.

BR
Pavel

Hi,

I would please also like to ask if vpss allowed with our LCD configuration:
width = 240
height = 320
Note that width<height.

Best Regards,
Ran

I now notice that the picture appear and immediately dissapear.
I remember from past expereience that psplash should be called just once, without looping from the outside.
Does it make sense ?

Check drivers/video/ti81xx/vpss/sysfs.h to get name of the supported modes.

Hi Pavel,

Now with your help I can see the image for a split of seond (I don't know why the image dissapear when calling psplash)

I also tried to start qt application, but I see that the image is not stable (moving fast on the screen).

If I see the color bar stable (vpss register) and this image is not, does it mean that the fbdev setting are not correct ?

These are the fbdev setting:

root@dm814x:/opt/dvr_rdk/ti814x# fbset -fb /dev/fb0

mode "240x320-782"

   # D: 148.500 MHz, H: 285.577 kHz, V: 782.403 Hz

   geometry 240 320 240 320 16

   timings 6734 148 88 36 4 44 5

   rgba 5/11,6/5,5/0,0/0

endmode

root@dm814x:/opt/dvr_rdk/ti814x#

while with same display in omap3530 evirnment (which function ok) I see:

mode "240x320-0"
# D: 0.000 MHz, H: 0.000 kHz, V: 0.000 Hz
geometry 240 320 240 320 16
timings 0 0 0 0 0 0 0
accel false
rgba 5/11,6/5,5/0,0/0
endmode

The timing line are not the same values as those I configured in vpss (echo 6500,320/1/22/2,240/2/1/1,1 > /sys/devices/platform/vpss/display1/timings)

Can this be the problem ? I tried to change thse values without help. I actually don't need fbdev to configure these value at all.

Best Regards,

Ran

Hi,

I am not sure if this is a matter of wrong timing configuration in vpss or wrong framebuffer (fbdev) configuration.
I see the test color bar stable, but the picture is not OK, and disappears.
What can be the cause of this ?

Regards,
Ran

Hi,

The following link contain the bar color (which seems stable) and the video of the image which I render in script in loop (becuase it dissapear I have to render it again and again)

The images on my board can be seen here:

https://drive.google.com/drive/folders/0B22GsWueReZTR1IxYzEteDNpUGc

Regards,

Ran

Hi,

As to fbdev mystery:

1. seems that fbdev uses timing from vpss, even although it print other timing (1920x1080). At least when I do the same in evm it works fine although other timing values (from vpss) are pttinted with fbdev

2. seems that fbdev behaves differently in different kernels. in older kernel it was suffecient to write into fbdev device just once, but in later version it is not. seems that also psplash changed accordingly.

But Still, I have some sync problem.

The image keep moving in horizontal axis only.

I tried to change several parameters but without success.

These are the timing I use:

echo 6500,240/1/22/2,320/2/1/1,1 > /sys/devices/platform/vpss/display1/timings

This is the video of the moving image:

Regards,

Ran