Wen Gong <quic_wgong@xxxxxxxxxxx> wrote: > In a special WCN7855 firmware release the EHT (IEEE 802.11be) support has > been disabled for size reduction. Currently ath12k always enables EHT PHY > mode during vdev start but with the special firmware that will cause a > firmware crash during vdev start in firmware initialisation. This is > because the firmware will use the EHT mode to allocate resources but as > the EHT mode is not available in the firmware, there's an internal > conflict and the firmware will crash. > > To fix the crash check the WMI_TLV_SERVICE_11BE flag to see if the firmware > supports EHT. If EHT is not supported downgrade the PHY mode to HE > (IEEE 802.11ax). > > This does not impact QCN9274, because WMI_SERVICE_11BE is always enabled > for QCN9274, then eht_cap->has_eht will always set for it, and the logic > of this patch will not take effect and the PHY mode will not down grade > for it. > > Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0-03427-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1.15378.4 > > Signed-off-by: Wen Gong <quic_wgong@xxxxxxxxxxx> > Acked-by: Jeff Johnson <quic_jjohnson@xxxxxxxxxxx> > Signed-off-by: Kalle Valo <quic_kvalo@xxxxxxxxxxx> Patch applied to ath-next branch of ath.git, thanks. 972754bfeec4 wifi: ath12k: add keep backward compatibility of PHY mode to avoid firmware crash -- https://patchwork.kernel.org/project/linux-wireless/patch/20230913105757.17744-1-quic_wgong@xxxxxxxxxxx/ https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
