Hi Arend, recently I got an SDIO module, which includes a BCM4359. I tried to get it up and running via the SD card interface on a RK3399 SoC and succeeded in doing so with bcmdhd.1.579.77.41.x and a vendor kernel (based on Linux 4.4). All that was necessary was configure BCMDHD to run with in-band IRQs and use a GPIO as gpio_wl_reg_on.
Since I can run a mainline kernel as well, I gave it a try and tried brcmfmac on Linux 4.19-rc7. As the BCM4359 is not in the list of supported SDIO devices, but is supported USB device, I've created a patch (attached), which adds the support for that device. Additionally I've patched my DTS to include the WL_REG_ON pin as part of mmc-pwrseq-simple's reset-gpios and added a bcm4329-fmac node in the mmc node. During bootup I see messages from brcmfmac, which indicate that the BCM4359 has been found, but loading the nvram file continuously fails: > [ 5.993741] brcmfmac: brcmf_fw_alloc_request: using brcm/brcmfmac4359-sdio > for chip BCM4359/9 > [...] > [ 7.987167] brcmfmac: brcmf_sdiod_ramrw: membytes transfer failed > [ 8.008715] brcmfmac: brcmf_sdio_verifymemory: error -84 on reading 2048 > membytes at 0x0025f1f0 > [ 8.021182] brcmfmac: brcmf_sdio_download_firmware: dongle nvram file > download failed That -84 means EILSEQ, which is the error value, which represents a CRC error during SDIO data exchange (returned by the function dw_mci_data_complete() in the MMC driver). To address this, I've reduced the clock speed (in several steps) to 400 kHz (and verified the clock signal on an oscilloscope), but the issue persists. I've also tried to use Linux 4.14.74, where I see the same issue. I can confirm that the MMC interface works in general (I can use an SD card to host my rootfs). FWIW I'm using the same exact same firmware and nvram file for the DHD driver and the brcmfmac. Do you have any ideas how to debug this issue? Thanks, Christoph
0001-brcmfmac-Add-SDIO-support-for-BCM4359.patch
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-- Christoph Müllner Theobroma Systems Design und Consulting GmbH Seestadtstraße 27 (Aspern IQ), 1220 Wien, Austria Phone: +43 1 236 98 93-409, Fax: +43 1 236 98 93-9 http://www.theobroma-systems.com
