brcmfmac: add comment block in brcmf_sdio_buscore_read()
In brcmf_sdio_buscore_read() there is some special handling upon register access to chipid register of the chipcommon core. Add comment explaining why it is done here. Signed-off-by: Arend van Spriel <arend.vanspriel@broadcom.com> Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
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@ -3772,6 +3772,13 @@ static u32 brcmf_sdio_buscore_read32(void *ctx, u32 addr)
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val = brcmf_sdiod_readl(sdiodev, addr, NULL);
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/*
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* this is a bit of special handling if reading the chipcommon chipid
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* register. The 4339 is a next-gen of the 4335. It uses the same
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* SDIO device id as 4335 and the chipid register returns 4335 as well.
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* It can be identified as 4339 by looking at the chip revision. It
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* is corrected here so the chip.c module has the right info.
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*/
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if (addr == CORE_CC_REG(SI_ENUM_BASE, chipid) &&
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(sdiodev->func1->device == SDIO_DEVICE_ID_BROADCOM_4339 ||
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sdiodev->func1->device == SDIO_DEVICE_ID_BROADCOM_4335_4339)) {
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