Commit a9841013 authored by Emmanuel Grumbach's avatar Emmanuel Grumbach Committed by John W. Linville

iwlwifi: don't switch to SGI if not supported by AP

This patch fixes SGI support. RS didn't look at the capabilities of the AP
before switching to SGI, this should lead to a stall in the traffic with an
AP that doesn't support SGI.
Signed-off-by: default avatarEmmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: default avatarGuy Cohen  <guy.cohen@intel.com>
Signed-off-by: default avatarTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent fd4abac5
......@@ -1439,6 +1439,15 @@ static int rs_move_siso_to_other(struct iwl_priv *priv,
}
break;
case IWL_SISO_SWITCH_GI:
if (!tbl->is_fat &&
!(priv->current_ht_config.sgf &
HT_SHORT_GI_20MHZ))
break;
if (tbl->is_fat &&
!(priv->current_ht_config.sgf &
HT_SHORT_GI_40MHZ))
break;
IWL_DEBUG_RATE("LQ: SISO toggle SGI/NGI\n");
memcpy(search_tbl, tbl, sz);
......@@ -1521,6 +1530,15 @@ static int rs_move_mimo_to_other(struct iwl_priv *priv,
break;
case IWL_MIMO_SWITCH_GI:
if (!tbl->is_fat &&
!(priv->current_ht_config.sgf &
HT_SHORT_GI_20MHZ))
break;
if (tbl->is_fat &&
!(priv->current_ht_config.sgf &
HT_SHORT_GI_40MHZ))
break;
IWL_DEBUG_RATE("LQ: MIMO toggle SGI/NGI\n");
/* Set up new search table for MIMO */
......
......@@ -610,8 +610,8 @@ struct iwl_hw_params {
#endif
};
#define HT_SHORT_GI_20MHZ_ONLY (1 << 0)
#define HT_SHORT_GI_40MHZ_ONLY (1 << 1)
#define HT_SHORT_GI_20MHZ (1 << 0)
#define HT_SHORT_GI_40MHZ (1 << 1)
#define IWL_RX_HDR(x) ((struct iwl4965_rx_frame_hdr *)(\
......
......@@ -700,9 +700,9 @@ static void iwl4965_ht_conf(struct iwl_priv *priv,
priv->ps_mode = (u8)((ht_conf->cap & IEEE80211_HT_CAP_MIMO_PS) >> 2);
if (ht_conf->cap & IEEE80211_HT_CAP_SGI_20)
iwl_conf->sgf |= 0x1;
iwl_conf->sgf |= HT_SHORT_GI_20MHZ;
if (ht_conf->cap & IEEE80211_HT_CAP_SGI_40)
iwl_conf->sgf |= 0x2;
iwl_conf->sgf |= HT_SHORT_GI_40MHZ;
iwl_conf->is_green_field = !!(ht_conf->cap & IEEE80211_HT_CAP_GRN_FLD);
iwl_conf->max_amsdu_size =
......
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