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Commit 32adbcaa authored by Arend Van Spriel's avatar Arend Van Spriel Committed by Kalle Valo
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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: default avatarArend van Spriel <arend.vanspriel@broadcom.com>
Signed-off-by: default avatarKalle Valo <kvalo@codeaurora.org>
parent c9aa7a91

drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c

+7 −0
Original line number Diff line number Diff line
@@ -3772,6 +3772,13 @@ static u32 brcmf_sdio_buscore_read32(void *ctx, u32 addr) 


	val = brcmf_sdiod_readl(sdiodev, addr, NULL);



	/*

	 * this is a bit of special handling if reading the chipcommon chipid

	 * register. The 4339 is a next-gen of the 4335. It uses the same

	 * SDIO device id as 4335 and the chipid register returns 4335 as well.

	 * It can be identified as 4339 by looking at the chip revision. It

	 * is corrected here so the chip.c module has the right info.

	 */

	if (addr == CORE_CC_REG(SI_ENUM_BASE, chipid) &&

	    (sdiodev->func1->device == SDIO_DEVICE_ID_BROADCOM_4339 ||

	     sdiodev->func1->device == SDIO_DEVICE_ID_BROADCOM_4335_4339)) {