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petr_simi's avatar
petr_simi
Icon for New Contributor rankNew Contributor
5 years ago
Solved

How to configure DisplayPort TX to support BT.2020 colorimetry

Hi everyone, we are not able to configure DisplayPort TX to use BT.2020 colorimetry. Let's say we want to transmit YCbCr 4:2:2, 10 bit, limited range, BT.2020. According to the Displa...
  • Deshi_Intel's avatar
    Deshi_Intel
    5 years ago

    HI,


    You are right in the sense that BT.2020 should be enabled via VSC SDP but I don't see you enable "secondary data channel" in your Intel DP Tx IP.

    • This could be the problem as you are transferring secondary data packet (SDP) here


    Below is what I found out from DP rev1.4 spec

    1. Pre-requisite
    • Ensure DP sink EDID support 3D Stereo in-band signaling
      • Ensure DP sink enable “VSC_SDP_EXTENSION_FOR_COLORIMETRY_SUPPORTED”, DPCD address 0x2210h (bit 3 = 1)
      • Enable Intel DP Tx “secondary data channel”
    • Then to enable/configure BT.2020 support
      • DP Tx set MSA (MISC1, bit6 =1) to use VSC SDP
      • Configured YCbCr 422 BT.2020 setting via VSC SDP, payload data byte (DB16)


    Thanks.


    Regards,

    dlim


Deshi_Intel's avatar
Deshi_Intel
Icon for Regular Contributor rankRegular Contributor
5 years ago

HI,


You are right in the sense that BT.2020 should be enabled via VSC SDP but I don't see you enable "secondary data channel" in your Intel DP Tx IP.

  • This could be the problem as you are transferring secondary data packet (SDP) here


Below is what I found out from DP rev1.4 spec

  1. Pre-requisite
  • Ensure DP sink EDID support 3D Stereo in-band signaling
    • Ensure DP sink enable “VSC_SDP_EXTENSION_FOR_COLORIMETRY_SUPPORTED”, DPCD address 0x2210h (bit 3 = 1)
    • Enable Intel DP Tx “secondary data channel”
  • Then to enable/configure BT.2020 support
    • DP Tx set MSA (MISC1, bit6 =1) to use VSC SDP
    • Configured YCbCr 422 BT.2020 setting via VSC SDP, payload data byte (DB16)


Thanks.


Regards,

dlim