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[Why & How] According to the vendor’s requirement, after each OUI write, the PSR cap must be read; otherwise, the vendor will default to using PSRSU. But its PSR cap indicates that it only supports PSR1. Reviewed-by: Wenjing Liu <wenjing.liu@amd.com> Signed-off-by: Paul Hsieh <Paul.Hsieh@amd.com> Signed-off-by: Ivan Lipski <ivan.lipski@amd.com> Tested-by: Dan Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>