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Does AM3894's DVO2 support 1280x1024 resolution

you Leeu
Prodigy 60 points

Does the new  display driver support  1280x1024 resolution? If  cann't , how to modify the  driver?

Please help me, thank you very much!

  • 0
    Prodigy 60 points

    Does  DVO2 supports  1024x768 or  640x480 ? If It can, what params  cant make it work?


    the following is found in VPSS_Video_Driver_UserGuide.pdf:

    Switching fb0(graphics0) output from HDMI VEVC(display0) to DVO2 VENC(display1)
    Follow the steps below to switch graphics0(fb0)output from HDMI to DVO2 VENC
    •   Disable graphics 0
    #echo 0 > /sys/devices/platform/vpss/graphics0/enabled
    •   Switch output VENC
    # echo 1:dvo2 > /sys/devices/platform/vpss/graphics0/nodes
    •   Enable graphics 0
    #echo 1 > /sys/devices/platform/vpss/graphics0/enabled

    echo 720p-60 > /sys/devices/platform/vpss/display0/mode

     


    when I input : echo 1024x768 > /sys/devices/platform/vpss/display0/mode, it say not support param.

    Can anyone help me? Thanks!

     



  • 0 in reply to you Leeu
    TI__Guru 66250 points

    We do support 1280x1024 on DVO2 output.

    display0 is for on-chip HDMI, since you are using DVO2, so it should be display1, please follow below steps:

    echo 0 > /sys/devices/platform/vpss/display1/enabled

    echo 1280x1024@60 > /sys/devices/platform/vpss/display1/mode

    echo 1 > /sys/devices/platform/vpss/display1/enabled

    Regards,

    yihe

     

  • 0 in reply to you Leeu
    TI__Mastermind 43875 points

    1024x768 is not one of the enumerated formats but you can specify specific timing parameters explicitly.

    Have a look at http://ap-fpdsp-swapps.dal.design.ti.com/index.php/DM816X_C6A816X_AM389X_VPSS_Video_Driver_User_Guide_PSP_04.00.00.12 and search for "timings" for more details.

    Basically, replace"echo 1024x768 > /sys/devices/platform/vpss/display0/mode" with "echo 65000,1024/24/160/136,768/3/29/6,1 > /sys/devices/platform/vpss/display0/timings"

    These numbers come from the VESA specification for 1024x768@60.

    BR,

    Steve

  • 0 in reply to yihe
    Prodigy 60 points

    Thank you very much!

    echo 1280x1024@60 > /sys/devices/platform/vpss/display0/mode

    This can work on HDMI, but there is display only on top half . The bottom half have no display.

    How to solve  this problem?

  • 0 in reply to you Leeu
    TI__Guru 66250 points

    HDMI does not support it, it only support via DVO2 port.

    regards,

     

    yihe

  • 0 in reply to yihe
    TI__Mastermind 20245 points

    Hi,

    Its supported in TI816X-LINUX-PSP-04.00.01.13 PSP release. You need to do it using timing sysfs entry rather than mode. Further since XGA is a VESA resolution, protocol will be DVI instead of HDMI. Many TVs many not support XGA resolution. Try connecting it to monitor instead of TV

     

    Regards,

    Hardik Shah