Package: src:linux Version: 7.1.3-1 Severity: normal Tags: patch X-Debbugs-Cc: [email protected]
Dear Maintainers, The debian-installer initrds for arm64 cannot bring up SDIO-attached Wi-Fi devices sitting behind an mmc-pwrseq-simple power sequencer, because the reset-gpio module is not included in any installer udeb. Observed on a MediaTek MT8186 Chromebook (Lenovo IdeaPad Slim 3 Chrome 14M868, device-tree compatible google,steelix-sku393221, "corsola" family) with an MT7921S Wi-Fi module on SDIO, booting the current daily arm64 netboot installer (kernel 7.1.3+deb14-arm64): ethdetect finds no NIC, manually loading mt7921s does nothing, and /sys/kernel/debug/devices_deferred shows: wifi-pwrseq pwrseq_simple: reset control not ready 11240000.mmc platform: supplied wifi-pwrseq not ready Root cause ---------- Since the conversion of pwrseq_simple to the reset framework (v6.9), pwrseq_simple with exactly one reset-gpios entry no longer toggles the GPIO directly: it requests a reset control, which the reset framework satisfies by instantiating an "auxiliary:reset.gpio" device bound by the reset-gpio driver (CONFIG_RESET_GPIO=m on arm64). pwrseq_simple itself is built into mmc_core.ko (CONFIG_MMC=m, CONFIG_PWRSEQ_SIMPLE=y), so it is always present, but without reset-gpio.ko the request returns -EPROBE_DEFER indefinitely. The MMC host for the Wi-Fi slot then never probes, the SDIO bus never enumerates, and the Wi-Fi driver has nothing to bind to. Installed systems are unaffected since the full linux-modules package ships the module; only the kernel-wedge initrd module selection lacks it. Verified fix ------------ Adding reset-gpio (plus the two mt7961 firmware files, which are a separate, known netboot limitation) to the netboot initrd and regenerating the module indices makes the same machine detect Wi-Fi in the installer immediately and out of the box: the deferred chain resolves during boot, the SDIO card enumerates and mt7921s binds without any manual step. The patch below adds reset-gpio to the shared mmc-modules list, marked optional so architectures without CONFIG_RESET_GPIO are unaffected. It sits with the MMC modules because its absence blocks MMC host probing; it will benefit any platform using mmc-pwrseq-simple with a single reset line (most ARM Chromebooks with SDIO Wi-Fi, various ARM boards). diff --git a/debian/installer/modules/mmc-modules b/debian/installer/modules/mmc-modules index c7aa372..e4974a1 100644 --- a/debian/installer/modules/mmc-modules +++ b/debian/installer/modules/mmc-modules @@ -4,5 +4,9 @@ drivers/mmc/host/** # Multifunction card reader driver tifm_7xx1 ? +# GPIO-based reset controller, required by mmc-pwrseq-simple +# (built into mmc_core) for a single reset-gpios line since 6.9 +reset-gpio ? + # Adds a dependency on pcmcia-modules sdricoh_cs -
