package/kernel/mac80211/patches/ath/973-ath10k_fix-band_center_freq-handling-for-VHT160-in-recent-firmwares.patch

   1 From: Sebastian Gottschall <s.gottschall@dd-wrt.com>
   2
   3 starting with firmware 10.4.3.4.x series QCA changed the handling of the channel property band_center_freq1 and band_center_freq2 in vht160 operation mode
   4 likelly for backward compatiblity with vht80 only capable clients.
   5 this patch adjusts the handling to get vht160 to work again with official qca firmwares newer than 3.3
   6 consider that this patch will not work with older firmwares anymore. to avoid undefined behaviour this we disable vht160 capability for outdated firmwares
   7 Signed-off-by: Sebastian Gottschall <s.gottschall@dd-wrt.com>
   8
   9 v2: fix trailing whitespace issue and fix some typos within the commit note
  10 ---
  11  drivers/net/wireless/ath/ath10k/mac.c |  7 -------
  12  drivers/net/wireless/ath/ath10k/wmi.c | 11 ++++++++---
  13  2 files changed, 8 insertions(+), 10 deletions(-)
  14 --- a/drivers/net/wireless/ath/ath10k/mac.c
  15 +++ b/drivers/net/wireless/ath/ath10k/mac.c
  16 @@ -4533,13 +4533,6 @@ static struct ieee80211_sta_vht_cap ath1
  17                 vht_cap.cap |= val;
  18         }
  19
  20 -       /* Currently the firmware seems to be buggy, don't enable 80+80
  21 -        * mode until that's resolved.
  22 -        */
  23 -       if ((ar->vht_cap_info & IEEE80211_VHT_CAP_SHORT_GI_160) &&
  24 -           (ar->vht_cap_info & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) == 0)
  25 -               vht_cap.cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
  26 -
  27         mcs_map = 0;
  28         for (i = 0; i < 8; i++) {
  29                 if ((i < ar->num_rf_chains) && (ar->cfg_tx_chainmask & BIT(i)))
  30 --- a/drivers/net/wireless/ath/ath10k/wmi.c
  31 +++ b/drivers/net/wireless/ath/ath10k/wmi.c
  32 @@ -1700,13 +1700,18 @@ void ath10k_wmi_put_wmi_channel(struct w
  33                 flags |= WMI_CHAN_FLAG_HT40_PLUS;
  34         if (arg->chan_radar)
  35                 flags |= WMI_CHAN_FLAG_DFS;
  36 -
  37 +       ch->band_center_freq2 = 0;
  38         ch->mhz = __cpu_to_le32(arg->freq);
  39         ch->band_center_freq1 = __cpu_to_le32(arg->band_center_freq1);
  40         if (arg->mode == MODE_11AC_VHT80_80)
  41                 ch->band_center_freq2 = __cpu_to_le32(arg->band_center_freq2);
  42 -       else
  43 -               ch->band_center_freq2 = 0;
  44 +       if (arg->mode == MODE_11AC_VHT160)  {
  45 +               if (arg->freq < arg->band_center_freq1)
  46 +                       ch->band_center_freq1 = __cpu_to_le32(arg->band_center_freq1 - 40);
  47 +               else
  48 +                       ch->band_center_freq1 = __cpu_to_le32(arg->band_center_freq1 + 40);
  49 +               ch->band_center_freq2 = __cpu_to_le32(arg->band_center_freq1);
  50 +       }
  51         ch->min_power = arg->min_power;
  52         ch->max_power = arg->max_power;
  53         ch->reg_power = arg->max_reg_power;