Hey all, I'm working on a setup using a RPi CM4 based board and a Sierra Wireless EM9191 module, running OpenWRT 21.02 and backported mhi+wwan drivers (from latest 5.15 rc). The kernel also has the mhi_pci_dev_info entry written by Thomas, as per https://forum.sierrawireless.com/t/sierra-wireless-airprime-em919x-pcie-support/24927 The EM9191 is now running 02.08.01.00 (latest firmware from Sierra), upgraded in several steps back from the original 01.04.01.02 the module came with. The firmware upgrades were done with qmi-firmware-update and the module in USB mode in a desktop PC. Most of the system boots end up with the mhi driver reporting that the module firmware crashed in different ways: [ 7.060730] mhi-pci-generic 0000:01:00.0: MHI PCI device found: sierra-em919x [ 7.067906] mhi-pci-generic 0000:01:00.0: BAR 0: assigned [mem 0x600000000-0x600000fff 64bit] [ 7.076455] mhi-pci-generic 0000:01:00.0: enabling device (0000 -> 0002) [ 7.083277] mhi-pci-generic 0000:01:00.0: using shared MSI [ 7.089508] mhi mhi0: Requested to power ON [ 7.094080] mhi mhi0: Attempting power on with EE: PASS THROUGH, state: SYS ERROR [ 7.180371] mhi mhi0: local ee: INVALID_EE state: RESET device ee: PASS THROUGH state: SYS ERROR [ 7.187146] mhi mhi0: Power on setup success [ 7.187219] mhi mhi0: Handling state transition: PBL [ 7.189165] mhi mhi0: System error detected [ 7.189178] mhi mhi0: Device MHI is not in valid state [ 7.189189] mhi-pci-generic 0000:01:00.0: firmware crashed (7) [ 7.213682] mhi mhi0: Handling state transition: SYS ERROR [ 7.219183] mhi mhi0: Transitioning from PM state: Linkdown or Error Fatal Detect to: SYS ERROR Process [ 7.228590] mhi-pci-generic 0000:01:00.0: firmware crashed (6) [ 7.234429] mhi mhi0: Failed to transition from PM state: Linkdown or Error Fatal Detect to: SYS ERROR Process [ 7.244433] mhi mhi0: Exiting with PM state: Linkdown or Error Fatal Detect, MHI state: RESET [ 7.252963] mhi mhi0: Handling state transition: DISABLE [ 7.258278] mhi mhi0: Processing disable transition with PM state: Linkdown or Error Fatal Detect [ 7.267155] mhi mhi0: Waiting for all pending event ring processing to complete [ 7.274480] mhi mhi0: Waiting for all pending threads to complete [ 7.280576] mhi mhi0: Reset all active channels and remove MHI devices [ 7.287110] mhi mhi0: Resetting EV CTXT and CMD CTXT [ 7.292077] mhi mhi0: Exiting with PM state: DISABLE, MHI state: RESET [ 7.298683] mhi-pci-generic 0000:01:00.0: failed to power up MHI controller [ 7.306184] mhi-pci-generic: probe of 0000:01:00.0 failed with error -110 Some of the boots successfully finish and I can talk to both the QMI and MBIM ports exposed by the WWAN subsystem, but the success rate is extremely low. Thomas, are you seeing similar issues in your setup? -- Aleksander https://aleksander.es
