Baochen Qiang <bqiang@xxxxxxxxxxxxxx> wrote: > In Qualcomm ARM platforms there is WL_EN pin and other power regulators > which can be controlled at platform side to completely reset the chip. > For most of x86 and other platforms, the chip is connected via PCIe M.2 > interface, and there is no way to control WL_EN pin. Instead the host > driver needs to reset the chip via PCIE_SOC_GLOBAL_RESET hardware > register, just like ath11k does currently. > > But when using PCIE_SOC_GLOBAL_RESET there are some hardware registers > which are not cleared/restored. To handle those cases we can enable > PLATFORM_CAP_PCIE_GLOBAL_RESET QMI host capability to tell the firmware > to do some platform specific operations after firmware download. > > This does not fix any known issues, but is recommended by the firmware > team, so enable the capability on QCA6390 and WCN6855 PCI devices. It is > currently unclear if this should be enabled also on QCN9074, so leave it > disabled for now. On AHB devices this is not needed as they don't use > PCIE_SOC_GLOBAL_RESET. > > Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-01720.1-QCAHSPSWPL_V1_V2_SILICONZ_LITE-1 > > Signed-off-by: Baochen Qiang <bqiang@xxxxxxxxxxxxxx> > Signed-off-by: Kalle Valo <quic_kvalo@xxxxxxxxxxx> Patch applied to ath-next branch of ath.git, thanks. 1e4ac7173c93 ath11k: enable PLATFORM_CAP_PCIE_GLOBAL_RESET QMI host capability -- https://patchwork.kernel.org/project/linux-wireless/patch/20211011055602.77342-1-bqiang@xxxxxxxxxxxxxx/ https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
