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DM8107 DVO2 output in DVR RDK 4.0

John Whittington1
Prodigy 110 points
Other Parts Discussed in Thread: DM8107

Is there a simple way to enable DVO2 support (i.e. VOUT0 pins)  on DM8107 using RDK4.0,
in the VDEC + VDIS usecase?

At a minimum, it seems necessary to change

    dvr_rdk/mcfw/src_bios6/links_m3vpss/system/system_dctrl.c (update gSystem_dctrlTriDisplayConfig for DM8107)

    dvr_rdk/mcfw/src_linux/mcfw_api/usecases/ti81xx/multich_vdec_vdis.c (keep first display as HDMI+HDCOMP, use DVO2 for second dispay instead of SD)

but I am getting errors in the DVO2 mode setting.

Will DVO2 be supported for DM8107 in the next RDK release?

  • 0
    TI__Expert 7765 points

    John,

    Are you going to use SATA HDD in your usecase? The DVO2 (VOUT0) venc was explicitly disabled for 8107 through sysfs entry.  See load.sh  

    # Disable DVO2 for DM8107
    # DVO2 in DM8107 MUST be disabled in order for SATA to work reliably
    echo 0 > /sys/devices/platform/vpss/display1/enabled

    Unless you remove this you wont be able to set mode for DVO2. Also, if DVO2 is enabled it is found that DVO2 (VOUT0) interferes with SATA clk when 20MHz crystal clk is used so we disabled DVO2 in order to have SATA stability. If you wish to enable DVO2 and use SATA, you need to ensure a separate LDO power supply only for 20MHz device oscillator is used or have 100MHz crystal on the board that drives both DVO2 (VOUT0) and SATA. The issue was not observed with 100MHz crystal clk. Details and work arounds for this issue are mentioned in Silicon Errata for 8107 under Advisory 1.1.27

    There is no plan to enable DVO2 for 8107 in next release.

     

  • 0 in reply to Yogesh Marathe
    Intellectual 425 points

    Yes, we would like to use SATA in our usecase.

    We have an option for 100MHz differential oscillator on SERDES_CLKP and SERDES_CLKN to drive SATA.

    On DM814x errata, this is listed as workaround #2 for the same errata ("SATA: Unable to Operate Both SATA and VOUT0 Without SATA Locking Up.")

    Is it valid for DM8107 as well?

    Do you have any pointers on how long it took the issue to show itself?

  • 0 in reply to John Whittington
    Intellectual 930 points
    Hi John,
    I try to use DVO2 output on my DM8107 custom board but I have also same problems. Have you resolve it ?
    I use the DVRRDK 04.01.00.02.

    Is it impossible to use VOUT0 in the DM8107 ? I don't understand ?

    Regards