[why] dp_48m_refclk_driver_pwdn is persistent through S3 and S5. This was worked arround in SMU FW 55.21.0. Earlier FW don't have this fix so we will hang on reboot [how] add a guard for smu versions before SMU FW 55.21.0 Signed-off-by: Joseph Gravenor <joseph.gravenor@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> |
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