drm/amd/display: Add support for hw_state logging via debugfs
[Why] We have logging methods for printing hardware state for newer ASICs but no way to trigger the log output. [How] Add support for triggering the output via writing to a debugfs file entry. Log output currently goes into dmesg for convenience, but accessing via a read should be possible later. Signed-off-by: NNicholas Kazlauskas <nicholas.kazlauskas@amd.com> Reviewed-by: NJordan Lazare <Jordan.Lazare@amd.com> Acked-by: NLeo Li <sunpeng.li@amd.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
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