From: Mauricio Bellon <[email protected]> Two related direct DisplayPort failures occur on DCN35 with a high-refresh DSC stream using two-way ODM. A normal transition from 4K120 to 4K144 can commit successfully but produce no visible output. After 4K144 is working, a long-pulse hotplug can reconstruct the same stream but leave the monitor black.
The first patch stabilizes the DCN35 ODM update. It exposes the missing ODM double-buffer pending-clear callback, keeps the horizontal timing divider under manual control while programming the ODM topology, waits for the update to complete, and restores the timing-derived target manual mode. The second patch enables sink DSC before source DSC in the DPMS-on pre-enable path and removes the later redundant sink DSC enablement. The complete series was built and booted as 7.1.0-bellon18-amd-final+ on a Lenovo ThinkPad X13 Gen 6 AMD with a Krackan Point Radeon 840M and Corsair Xeneon 32UHD144 connected directly through USB-C DP Alt Mode SST. The following scenarios all produced stable visible output: - 4K144 initial modeset - 4K120 to 4K144 - 4K144 to 4K120 to 4K144 - 4K144 long-pulse unplug/replug - repeated 4K144 unplug/replug cycles This series covers the direct-SST modeset and hotplug reconstruction failures. It does not claim to address the separate DPIA/MST warning observed through the USB4 dock. The commits retain my Lenovo author and Signed-off-by address. This submission is sent through my personal Gmail account because Lenovo email is not compatible with git send-email. Bug report: https://gitlab.freedesktop.org/drm/amd/-/issues/5033 Mauricio Bellon (2): drm/amd/display: stabilize DCN35 ODM update sequencing drm/amd/display: enable sink DSC before source DSC .../amd/display/dc/hwss/dcn35/dcn35_hwseq.c | 20 +++++++++++++++++-- .../gpu/drm/amd/display/dc/link/link_dpms.c | 5 +++-- .../amd/display/dc/optc/dcn35/dcn35_optc.c | 2 ++ 3 files changed, 23 insertions(+), 4 deletions(-) base-commit: 232bf7d5453df6cc0d877a1003f9aa172e9750de -- 2.53.0
