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Arthur Heymans
5e08102d1d
Commit56d8ce9d8c("drm/amd/display: Apply correct panel mode when reinitializing hardware") made ASSR failure fall back to the default panel mode unless eDP mode had previously been applied. However, dc_link is zero-initialized and DP_PANEL_MODE_DEFAULT is zero. Before the first call to dp_set_panel_mode(), panel_mode therefore looks like a previously applied default mode. If ASSR setup fails during the first link training attempt, the driver incorrectly trains the eDP link using the default scrambling mode. On a Google Vilboz Chromebook running self-built coreboot firmware and PSP verstage, this leaves the panel mostly black with corrupted output along the top edge. Track whether panel_mode has actually been initialized, and only consult the saved mode after it has been applied. This retains the recovery behavior while preserving eDP mode during initial link training. Fixes:56d8ce9d8c("drm/amd/display: Apply correct panel mode when reinitializing hardware") Assisted-by: Pi:gpt-5.6-sol Reviewed-by: George Zhang <[email protected]> Reviewed-by: Alex Hung <[email protected]> Signed-off-by: Arthur Heymans <[email protected]> Tested-by: Dan Wheeler <[email protected]> Signed-off-by: Alex Deucher <[email protected]> (cherry picked from commit ccb6c2702033f1002b45807fb3cc938760f26f78) Cc: [email protected] # 6.4.x