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[Why] For upcoming PSR stupport it's useful to have debug entry to verify psr state. [How] - Enable psr dc api for Linux - Add psr_state file to eDP connector debugfs usage e.g.: cat /sys/kernel/debug/dri/0/DP-1/psr_state Signed-off-by: Roman Li <Roman.Li@amd.com> Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com> Acked-by: Leo Li <sunpeng.li@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>