On 11/20/2023 2:15 AM, 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@xxxxxxxxxxx> Acked-by: Jeff Johnson <quic_jjohnson@xxxxxxxxxxx>
