[PATCH v2 5/7] wifi: ath12k: add support one MSI vector

[Jeff Johnson]

On 11/20/2023 6:13 PM, Kang Yang wrote:
> On some platforms it's not possible to allocate 32 MSI vectors for
> various reasons, maybe kernel configuration, VT-d disabled, buggy BIOS
> etc. So ath12k was not able to use WCN7850 PCI devices on those
> platforms. Add support for one MSI vector to solve that.
> 
> In case of one MSI vector, interrupt migration needs to be disabled.
> This is because when interrupt migration happens, the msi_data may
> change. However, msi_data is already programmed to rings during initial
> phase and ath12k has no way to know that msi_data is changed during run
> time and reprogram again.
> 
> In case of one MSI vector, MHI subsystem should not use IRQF_NO_SUSPEND
> as WCN7850 doesn't set this flag too. Ath12k doesn't need to leave IRQ
> enabled in suspend state.
> 
> Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0-03427-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1.15378.4
> 
> Signed-off-by: Kang Yang <quic_kangyang at quicinc.com>
Acked-by: Jeff Johnson <quic_jjohnson at quicinc.com>