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images jitter when cloning outputs

Alexander Vasiljev
Expert 1015 points

Hi.

I try to clone image from LCD to HDMI display on dm8148. Here is what i write:

root@dm814x-evm:/usr/share/ti/data# echo 0 > /sys/devices/platform/vpss/graphics0/enabled
root@dm814x-evm:/usr/share/ti/data# echo 0 > /sys/devices/platform/vpss/display0/enabled
root@dm814x-evm:/usr/share/ti/data# echo 0 > /sys/devices/platform/vpss/display1/enabled
root@dm814x-evm:/usr/share/ti/data# echo 33500,800/164/89/10,480/10/23/10,1 > /sys/devices/platform/vpss/display0/timings
root@dm814x-evm:/usr/share/ti/data# echo 5 > /sys/devices/platform/vpss/system/tiedvencs
root@dm814x-evm:/usr/share/ti/data# echo 2:hdmi,dvo2  > /sys/devices/platform/vpss/graphics0/nodes
root@dm814x-evm:/usr/share/ti/data# echo 1 > /sys/devices/platform/vpss/graphics0/enabled
root@dm814x-evm:/usr/share/ti/data# cat //sys/devices/platform/vpss/display1/timings 33500,800/164/89/10,480/10/23/10,1
root@dm814x-evm:/usr/share/ti/data# cat //sys/devices/platform/vpss/display0/timings 33500,800/164/89/10,480/10/23/10,1

And yes the images are the same, but the images on both displays are jittering [moving around]. (When i use one display, the image stays still.)

1) Why is it jittering?

2) If i whant to use fb0 and fb1, can i clone both of them to both displays?

Best regards,

Alexander.

  • 0
    TI__Mastermind 20245 points

    Hi,

    Cloning of graphics planes like AM35x is not supported for this devices. Regarding you question are you trying to tie both displays with same resolution as LCD? Do you have LCD on both ports like DVO1 and DVO2 or you have HDMI and DVO2.

    Regards,

    Hardik Shah

  • 0 in reply to HardikShah
    Expert 1015 points

    Hi, Hardik.

    I use an evaluation module for dm8148 from Mistral. So it has a LCD on dvo2 and hdmi output. As i understand HDMI monitor, which i use, can eat any resolution.

    Regarding out target soultion it would be great to have twice resolution on hdmi, than on LCD. Say receive 2048x1536, output 1024x768 to LCD and 1920x1080 to hdmi. But as of now i don't know if dm8148 can support this. So clonning 1024x768 image to both displays will be acceptable solution.

    Best regards,

    Alexander Vasiljev.

  • 0 in reply to HardikShah
    Expert 1015 points

    Hi, Hardik.

    I still want to clone graphics from lcd to hdmi as described here (http://processors.wiki.ti.com/index.php/DM814X_AM387X_VPSS_Video_Driver_User_Guide#Cloning_fb0.28graphics0.29_output_to_both_HDMI_VENC.28display0.29_and_DVO2_VENC.28display1.29) .

    But images are still jittering with new ezsdk  (5-04-00-11).

    Can you confirm that this functionality is not supported in software or in hardware for 8148 devices, although it is described in the link above?

    Best regards,

    Alexander Vasiljev.