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由 Alex Deucher 提交于
This callback writes a value to a register and then reads back another register and waits for a value in a single operation. Provide a helper function using two operations for engines that don't support this opertion. Reviewed-by: NHuang Rui <ray.huang@amd.com> Reviewed-by: NChristian König <christian.koenig@amd.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
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