On 7/16/2025 12:50 AM, Alexander Wilhelm wrote: > Fix endianness handling in QMI firmware transfer on big-endian > platforms. Without this fix, the firmware download fails due to > misinterpreted data structures exchanged between the host and the > wireless module. > > The issue occurs during early bring-up on big endian systems, where QMI > messages are not correctly parsed by the driver, leading to failed > initialization sequences. Ensure all relevant fields are properly > converted between CPU and little-endian format in request and response > messages, as expected by the firmware. Attached logs showing the failure > before the fix: > > ath12k_pci 0001:01:00.0: BAR 0: assigned [mem 0xc00000000-0xc001fffff 64bit] > ath12k_pci 0001:01:00.0: boot pci_mem 0xcd4148e9 > ath12k_pci 0001:01:00.0: pci probe 17cb:1109 17cb:1109 > ath12k_pci 0001:01:00.0: pci tcsr_soc_hw_version major 2 minor 0 > ath12k_pci 0001:01:00.0: request MSI one vector > ath12k_pci 0001:01:00.0: MSI vectors: 1 > ath12k_pci 0001:01:00.0: msi base data is 0 > ath12k_pci 0001:01:00.0: Hardware name: qcn9274 hw2.0 > ath12k_pci 0001:01:00.0: boot firmware request ath12k/QCN9274/hw2.0/firmware-2.bin size 15134776 > ath12k_pci 0001:01:00.0: found fw timestamp 1722934582 > ath12k_pci 0001:01:00.0: found m3 image ie (421880 B) > ath12k_pci 0001:01:00.0: found fw image ie (7229440 B) > ath12k_pci 0001:01:00.0: found dualmac fw image ie (7483392 B) > ath12k_pci 0001:01:00.0: found firmware features ie (1 B) > ath12k_pci 0001:01:00.0: features > ath12k_pci 0001:01:00.0: using fw api 2 > ath12k_pci 0001:01:00.0: dualmac fw selected for board id: 1005 > ath12k_pci 0001:01:00.0: Assign MSI to user: MHI, num_vectors: 3, user_base_data: 0, base_vector: 0 > ath12k_pci 0001:01:00.0: Number of assigned MSI for MHI is 3, base vector is 0 > ath12k_pci 0001:01:00.0: Assign MSI to user: CE, num_vectors: 1, user_base_data: 0, base_vector: 0 > ath12k_pci 0001:01:00.0: Assign MSI to user: DP, num_vectors: 1, user_base_data: 0, base_vector: 0 > ath12k_pci 0001:01:00.0: irq:18 group:0 > ath12k_pci 0001:01:00.0: irq:18 group:1 > ath12k_pci 0001:01:00.0: irq:18 group:2 > ath12k_pci 0001:01:00.0: irq:18 group:3 > ath12k_pci 0001:01:00.0: irq:18 group:4 > ath12k_pci 0001:01:00.0: irq:18 group:5 > ath12k_pci 0001:01:00.0: irq:18 group:6 > ath12k_pci 0001:01:00.0: irq:18 group:7 > ath12k_pci 0001:01:00.0: pci after request_irq msi_ep_base_data 0 > ath12k_pci 0001:01:00.0: cookie:0x0 > ath12k_pci 0001:01:00.0: WLAON_WARM_SW_ENTRY 0x2 > ath12k_pci 0001:01:00.0: WLAON_WARM_SW_ENTRY 0x2 > ath12k_pci 0001:01:00.0: soc reset cause:0 > ath12k_pci 0001:01:00.0: MHISTATUS 0xff04 > ath12k_pci 0001:01:00.0: pci link_ctl 0x0000 L0s 0 L1 0 > ath12k_pci 0001:01:00.0: pci reg 0x3164 instance 0x11 read val 0x11 > ath12k_pci 0001:01:00.0: setting mhi state: INIT(0) > ath12k_pci 0001:01:00.0: setting mhi state: POWER_ON(2) > ath12k_pci 0001:01:00.0: mhi notify status reason UNKNOWN > ath12k_pci 0001:01:00.0: mhi notify status reason MHI_CB_EE_MISSION_MODE > ath12k_pci 0001:01:00.0: qmi wifi fw qmi service connected > ath12k_pci 0001:01:00.0: phy capability resp valid 1 num_phy 2 valid 1 board_id 84934656 valid 1 single_chip_mlo_support 0 > ath12k_pci 0001:01:00.0: intra device MLO is disabled hence skip QMI MLO cap > > Alexander Wilhelm (11): > wifi: ath12k: fix endianness handling in QMI host capability request > wifi: ath12k: fix endianness handling in QMI phy capability response > wifi: ath12k: fix endianness handling in QMI firmware indication > wifi: ath12k: fix endianness handling in QMI firmware memory indication > wifi: ath12k: fix endianness handling in QMI respond firmware memory > wifi: ath12k: fix endianness handling in QMI firmware capabilities > wifi: ath12k: fix endianness handling in QMI bdf download > wifi: ath12k: fix endianness handling in QMI firmware m3 info > wifi: ath12k: fix endianness handling in QMI firmware wlan mode > wifi: ath12k: fix endianness handling in QMI wlan configuration > wifi: ath12k: fix endianness handling in QMI response > > drivers/net/wireless/ath/ath12k/qmi.c | 149 ++++++++++++++------------ > drivers/net/wireless/ath/ath12k/qmi.h | 106 +++++++++--------- > include/linux/soc/qcom/qmi.h | 4 +- > 3 files changed, 136 insertions(+), 123 deletions(-) > Frankly I'm shocked that the low-level QMI encode/decode is not doing the endian conversion. Since the Qualcomm internal tool that generates the data structures has always generated structs with cpu endianess (i.e. u8, u16, u32, etc) I just assumed that endian conversion was handled at a low level. So should this issue be pushed down to the QMI encode/decode rather than foist it upon every client's read & write? /jeff
