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modetest: add support for writeback connector

Dmitry Baryshkov requested to merge lumag/drm:writeback into main

Add writeback support to modetest with the below options:

  • Passing in -a -c will now also show the writeback connector

  • Dump the writeback output buffer to bitstream Usage: "./modetest -M msm -s <connector_id>: -a -o -P <plane_id>@<crtc_id>:+0+0@RG24"

This currently supports single writeback connector.

Co-developed-by: Rohith Iyer quic_rohiiyer@quicinc.com Signed-off-by: Jessica Zhang quic_jesszhan@quicinc.com [DB: dropped custom mode support, fixed segfault] Signed-off-by: Dmitry Baryshkov dmitry.baryshkov@linaro.org

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