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@xxxxxxxxxxxx>
---
drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
index 81eb776..0868614 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
@@ -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)) {
--
1.9.1
