iwlwifi: mvm: add LDPC support

Use LDPC for Tx and publish support for Rx in case the chip
supports LDPC. Enable it for the 7265 family.

Signed-off-by: Eyal Shapira <eyalx.shapira@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

6 files changed, 40 insertions, 9 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-7000.c b/drivers/net/wireless/iwlwifi/iwl-7000.c
index 8e99dffa88e8..79c8f74685d5 100644
--- a/drivers/net/wireless/iwlwifi/iwl-7000.c
+++ b/drivers/net/wireless/iwlwifi/iwl-7000.c
@@ -220,6 +220,12 @@ static const struct iwl_pwr_tx_backoff iwl7265_pwr_tx_backoffs[] = {
         {0},
 };
 
+static const struct iwl_ht_params iwl7265_ht_params = {
+        .stbc = true,
+        .ldpc = true,
+        .ht40_bands = BIT(IEEE80211_BAND_2GHZ) | BIT(IEEE80211_BAND_5GHZ),
+};
+
 const struct iwl_cfg iwl3165_2ac_cfg = {
         .name = "Intel(R) Dual Band Wireless AC 3165",
         .fw_name_pre = IWL3165_FW_PRE,
@@ -234,7 +240,7 @@ const struct iwl_cfg iwl7265_2ac_cfg = {
         .name = "Intel(R) Dual Band Wireless AC 7265",
         .fw_name_pre = IWL7265_FW_PRE,
         IWL_DEVICE_7000,
-        .ht_params = &iwl7000_ht_params,
+        .ht_params = &iwl7265_ht_params,
         .nvm_ver = IWL7265_NVM_VERSION,
         .nvm_calib_ver = IWL7265_TX_POWER_VERSION,
         .pwr_tx_backoffs = iwl7265_pwr_tx_backoffs,
@@ -244,7 +250,7 @@ const struct iwl_cfg iwl7265_2n_cfg = {
         .name = "Intel(R) Dual Band Wireless N 7265",
         .fw_name_pre = IWL7265_FW_PRE,
         IWL_DEVICE_7000,
-        .ht_params = &iwl7000_ht_params,
+        .ht_params = &iwl7265_ht_params,
         .nvm_ver = IWL7265_NVM_VERSION,
         .nvm_calib_ver = IWL7265_TX_POWER_VERSION,
         .pwr_tx_backoffs = iwl7265_pwr_tx_backoffs,
@@ -254,7 +260,7 @@ const struct iwl_cfg iwl7265_n_cfg = {
         .name = "Intel(R) Wireless N 7265",
         .fw_name_pre = IWL7265_FW_PRE,
         IWL_DEVICE_7000,
-        .ht_params = &iwl7000_ht_params,
+        .ht_params = &iwl7265_ht_params,
         .nvm_ver = IWL7265_NVM_VERSION,
         .nvm_calib_ver = IWL7265_TX_POWER_VERSION,
         .pwr_tx_backoffs = iwl7265_pwr_tx_backoffs,
diff --git a/drivers/net/wireless/iwlwifi/iwl-config.h b/drivers/net/wireless/iwlwifi/iwl-config.h
index 3d7cc37420ae..07c0f1fdb993 100644
--- a/drivers/net/wireless/iwlwifi/iwl-config.h
+++ b/drivers/net/wireless/iwlwifi/iwl-config.h
@@ -171,6 +171,7 @@ struct iwl_base_params {
 
 /*
  * @stbc: support Tx STBC and 1*SS Rx STBC
+ * @ldpc: support Tx/Rx with LDPC
  * @use_rts_for_aggregation: use rts/cts protection for HT traffic
  * @ht40_bands: bitmap of bands (using %IEEE80211_BAND_*) that support HT40
  */
@@ -178,6 +179,7 @@ struct iwl_ht_params {
         enum ieee80211_smps_mode smps_mode;
         const bool ht_greenfield_support; /* if used set to true */
         const bool stbc;
+        const bool ldpc;
         bool use_rts_for_aggregation;
         u8 ht40_bands;
 };
diff --git a/drivers/net/wireless/iwlwifi/iwl-eeprom-parse.c b/drivers/net/wireless/iwlwifi/iwl-eeprom-parse.c
index 07ff7e0028ee..74b796dc4242 100644
--- a/drivers/net/wireless/iwlwifi/iwl-eeprom-parse.c
+++ b/drivers/net/wireless/iwlwifi/iwl-eeprom-parse.c
@@ -758,6 +758,9 @@ void iwl_init_ht_hw_capab(const struct iwl_cfg *cfg,
                         ht_info->cap |= IEEE80211_HT_CAP_TX_STBC;
         }
 
+        if (cfg->ht_params->ldpc)
+                ht_info->cap |= IEEE80211_HT_CAP_LDPC_CODING;
+
         if (iwlwifi_mod_params.amsdu_size_8K)
                 ht_info->cap |= IEEE80211_HT_CAP_MAX_AMSDU;
 
diff --git a/drivers/net/wireless/iwlwifi/iwl-nvm-parse.c b/drivers/net/wireless/iwlwifi/iwl-nvm-parse.c
index 40718f814f8d..c302e7468559 100644
--- a/drivers/net/wireless/iwlwifi/iwl-nvm-parse.c
+++ b/drivers/net/wireless/iwlwifi/iwl-nvm-parse.c
@@ -334,6 +334,9 @@ static void iwl_init_vht_hw_capab(const struct iwl_cfg *cfg,
                        3 << IEEE80211_VHT_CAP_BEAMFORMEE_STS_SHIFT |
                        7 << IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_SHIFT;
 
+        if (cfg->ht_params->ldpc)
+                vht_cap->cap |= IEEE80211_VHT_CAP_RXLDPC;
+
         if (num_tx_ants > 1)
                 vht_cap->cap |= IEEE80211_VHT_CAP_TXSTBC;
         else
diff --git a/drivers/net/wireless/iwlwifi/mvm/rs.c b/drivers/net/wireless/iwlwifi/mvm/rs.c
index 17002cf437db..6a13120f96db 100644
--- a/drivers/net/wireless/iwlwifi/mvm/rs.c
+++ b/drivers/net/wireless/iwlwifi/mvm/rs.c
@@ -505,10 +505,10 @@ static const char *rs_pretty_lq_type(enum iwl_table_type type)
 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
                                 const char *prefix)
 {
-        IWL_DEBUG_RATE(mvm, "%s: (%s: %d) ANT: %s BW: %d SGI: %d\n",
+        IWL_DEBUG_RATE(mvm, "%s: (%s: %d) ANT: %s BW: %d SGI: %d LDPC: %d\n",
                        prefix, rs_pretty_lq_type(rate->type),
                        rate->index, rs_pretty_ant(rate->ant),
-                       rate->bw, rate->sgi);
+                       rate->bw, rate->sgi, rate->ldpc);
 }
 
 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
@@ -742,6 +742,8 @@ static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
         ucode_rate |= rate->bw;
         if (rate->sgi)
                 ucode_rate |= RATE_MCS_SGI_MSK;
+        if (rate->ldpc)
+                ucode_rate |= RATE_MCS_LDPC_MSK;
 
         return ucode_rate;
 }
@@ -779,6 +781,8 @@ static int rs_rate_from_ucode_rate(const u32 ucode_rate,
         /* HT or VHT */
         if (ucode_rate & RATE_MCS_SGI_MSK)
                 rate->sgi = true;
+        if (ucode_rate & RATE_MCS_LDPC_MSK)
+                rate->ldpc = true;
 
         rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
 
@@ -965,13 +969,13 @@ static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
                              rate->index > IWL_RATE_MCS_9_INDEX);
 
                 rate->index = rs_ht_to_legacy[rate->index];
+                rate->ldpc = false;
         } else {
                 /* Downgrade to SISO with same MCS if in MIMO  */
                 rate->type = is_vht_mimo2(rate) ?
                         LQ_VHT_SISO : LQ_HT_SISO;
         }
 
-
         if (num_of_ant(rate->ant) > 1)
                 rate->ant = first_antenna(mvm->fw->valid_tx_ant);
 
@@ -1621,6 +1625,7 @@ static int rs_switch_to_column(struct iwl_mvm *mvm,
         }
 
         rate->bw = rs_bw_from_sta_bw(sta);
+        rate->ldpc = lq_sta->ldpc;
         search_tbl->column = col_id;
         rs_set_expected_tpt_table(lq_sta, search_tbl);
 
@@ -2342,6 +2347,7 @@ static void rs_initialize_lq(struct iwl_mvm *mvm,
         rate->index = i;
         rate->ant = first_antenna(valid_tx_ant);
         rate->sgi = false;
+        rate->ldpc = false;
         rate->bw = RATE_MCS_CHAN_WIDTH_20;
         if (band == IEEE80211_BAND_5GHZ)
                 rate->type = LQ_LEGACY_A;
@@ -2610,9 +2616,16 @@ void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
                 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
 
                 lq_sta->is_vht = false;
+                if (mvm->cfg->ht_params->ldpc &&
+                    (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
+                        lq_sta->ldpc = true;
         } else {
                 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
                 lq_sta->is_vht = true;
+
+                if (mvm->cfg->ht_params->ldpc &&
+                    (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
+                        lq_sta->ldpc = true;
         }
 
         lq_sta->max_legacy_rate_idx = find_last_bit(&lq_sta->active_legacy_rate,
@@ -2622,11 +2635,12 @@ void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
         lq_sta->max_mimo2_rate_idx = find_last_bit(&lq_sta->active_mimo2_rate,
                                                    BITS_PER_LONG);
 
-        IWL_DEBUG_RATE(mvm, "RATE MASK: LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d\n",
+        IWL_DEBUG_RATE(mvm,
+                       "RATE MASK: LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d\n",
                        lq_sta->active_legacy_rate,
                        lq_sta->active_siso_rate,
                        lq_sta->active_mimo2_rate,
-                       lq_sta->is_vht);
+                       lq_sta->is_vht, lq_sta->ldpc);
         IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
                        lq_sta->max_legacy_rate_idx,
                        lq_sta->max_siso_rate_idx,
@@ -3032,8 +3046,9 @@ static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
                                    (is_ht20(rate)) ? "20MHz" :
                                    (is_ht40(rate)) ? "40MHz" :
                                    (is_ht80(rate)) ? "80Mhz" : "BAD BW");
-                   desc += sprintf(buff+desc, " %s %s\n",
+                   desc += sprintf(buff+desc, " %s %s %s\n",
                                    (rate->sgi) ? "SGI" : "NGI",
+                                   (rate->ldpc) ? "LDPC" : "BCC",
                                    (lq_sta->is_agg) ? "AGG on" : "");
         }
         desc += sprintf(buff+desc, "last tx rate=0x%X\n",
diff --git a/drivers/net/wireless/iwlwifi/mvm/rs.h b/drivers/net/wireless/iwlwifi/mvm/rs.h
index f27b9d687a25..824a7506fc04 100644
--- a/drivers/net/wireless/iwlwifi/mvm/rs.h
+++ b/drivers/net/wireless/iwlwifi/mvm/rs.h
@@ -207,6 +207,7 @@ struct rs_rate {
         u8 ant;
         u32 bw;
         bool sgi;
+        bool ldpc;
 };
 
 
@@ -329,6 +330,7 @@ struct iwl_lq_sta {
                                  */
         u64 last_tx;
         bool is_vht;
+        bool ldpc;              /* LDPC Rx is supported by the STA */
         enum ieee80211_band band;
 
         struct rs_rate_stats tx_stats[RS_COLUMN_COUNT][IWL_RATE_COUNT];