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From:   gregory.greenman@intel.com
To:     kvalo@kernel.org, johannes@sipsolutions.net
Cc:     linux-wireless@vger.kernel.org,
        Gregory Greenman <gregory.greenman@intel.com>
Subject: [PATCH 11/14] wifi: iwlwifi: disable RX STBC when a device doesn't support it
Date:   Wed, 24 May 2023 20:42:08 +0300
Message-Id: <20230524203151.65c3e09813e5.Iadfd8cdb0ea5a8088ae3daa555c780c423951894@changeid>
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From: Gregory Greenman <gregory.greenman@intel.com>

Some devices, like step A0 of GL FM device doesn't support RX STBC
for VHT/HE. Add a workaround to remove it from capabilities in
this case.

Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
---
 drivers/net/wireless/intel/iwlwifi/iwl-nvm-parse.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/net/wireless/intel/iwlwifi/iwl-nvm-parse.c b/drivers/net/wireless/intel/iwlwifi/iwl-nvm-parse.c
index 7dcb1c3ab728..cf19e8a561e9 100644
--- a/drivers/net/wireless/intel/iwlwifi/iwl-nvm-parse.c
+++ b/drivers/net/wireless/intel/iwlwifi/iwl-nvm-parse.c
@@ -464,6 +464,9 @@ static void iwl_init_vht_hw_capab(struct iwl_trans *trans,
 		       IEEE80211_VHT_MAX_AMPDU_1024K <<
 		       IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_SHIFT;
 
+	if (!trans->cfg->ht_params->stbc)
+		vht_cap->cap &= ~IEEE80211_VHT_CAP_RXSTBC_MASK;
+
 	if (data->vht160_supported)
 		vht_cap->cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ |
 				IEEE80211_VHT_CAP_SHORT_GI_160;
@@ -986,6 +989,13 @@ iwl_nvm_fixup_sband_iftd(struct iwl_trans *trans,
 		iftype_data->vendor_elems.data = iwl_vendor_caps;
 		iftype_data->vendor_elems.len = ARRAY_SIZE(iwl_vendor_caps);
 	}
+
+	if (!trans->cfg->ht_params->stbc) {
+		iftype_data->he_cap.he_cap_elem.phy_cap_info[2] &=
+			~IEEE80211_HE_PHY_CAP2_STBC_RX_UNDER_80MHZ;
+		iftype_data->he_cap.he_cap_elem.phy_cap_info[7] &=
+			~IEEE80211_HE_PHY_CAP7_STBC_RX_ABOVE_80MHZ;
+	}
 }
 
 static void iwl_init_he_hw_capab(struct iwl_trans *trans,
-- 
2.38.1