Description
To correctlt enable MSI interrupts, the host must first set the MSI Enable bit, then set the Interrupt Disable bit and finially set the Bus Master bit, as described in the steps below:
1. Set the MSI Enable at bit[0] of MSI Control Status register, this bit is mapped to bit[16] of configuration space register offset 0x50.
2. Set the Interrupt Disable at bit[10] of Command Register at configuration space offset register 0x4 to disable legacy interrupt.
3. Set the Bus Master at bit[2] of Command Register at configuration space offset register 0x4 to enable the ability to generate MSI message.