package/kernel/mac80211/patches/316-v4.16-0002-brcmfmac-add-comment-block-in-brcmf_sdio_buscore_rea.patch

   1 From 32adbcaa5df49f1977441f7a4bf180a0bcfe9966 Mon Sep 17 00:00:00 2001
   2 From: Arend Van Spriel <arend.vanspriel@broadcom.com>
   3 Date: Tue, 9 Jan 2018 13:22:53 +0100
   4 Subject: [PATCH] brcmfmac: add comment block in brcmf_sdio_buscore_read()
   5
   6 In brcmf_sdio_buscore_read() there is some special handling upon
   7 register access to chipid register of the chipcommon core. Add
   8 comment explaining why it is done here.
   9
  10 Signed-off-by: Arend van Spriel <arend.vanspriel@broadcom.com>
  11 Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
  12 ---
  13  drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c | 7 +++++++
  14  1 file changed, 7 insertions(+)
  15
  16 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
  17 +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
  18 @@ -3772,6 +3772,13 @@ static u32 brcmf_sdio_buscore_read32(voi
  19
  20         val = brcmf_sdiod_readl(sdiodev, addr, NULL);
  21
  22 +       /*
  23 +        * this is a bit of special handling if reading the chipcommon chipid
  24 +        * register. The 4339 is a next-gen of the 4335. It uses the same
  25 +        * SDIO device id as 4335 and the chipid register returns 4335 as well.
  26 +        * It can be identified as 4339 by looking at the chip revision. It
  27 +        * is corrected here so the chip.c module has the right info.
  28 +        */
  29         if (addr == CORE_CC_REG(SI_ENUM_BASE, chipid) &&
  30             (sdiodev->func1->device == SDIO_DEVICE_ID_BROADCOM_4339 ||
  31              sdiodev->func1->device == SDIO_DEVICE_ID_BROADCOM_4335_4339)) {