iwlagn: implement layout-agnostic EEPROM reading

From: Johannes Berg <johannes.berg@intel.com>

The current EEPROM reading code has some layout
assumptions that now turned out to be false with
some newer versions of the EEPROM. Luckily, we
can avoid all such assumptions by using data in
the EEPROM itself, so implement using that.

However, for risk mitigation purposes, keep the
old reading code for current hardware for now.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>

diff --git a/drivers/net/wireless/iwlwifi/iwl-1000.c b/drivers/net/wireless/iwlwifi/iwl-1000.c
index db540910b1104d42b5d20d15e542c3fc5da7649c..0e027f787fbce6452b0c78fefc24dbd30cb75100 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-1000.c
+++ b/drivers/net/wireless/iwlwifi/iwl-1000.c
@@ -315,6 +315,7 @@ struct iwl_cfg iwl100_bgn_cfg = {
        .mod_params = &iwlagn_mod_params,
        .base_params = &iwl1000_base_params,
        .ht_params = &iwl1000_ht_params,
+       .use_new_eeprom_reading = true,
 };
 
 struct iwl_cfg iwl100_bg_cfg = {
@@ -330,6 +331,7 @@ struct iwl_cfg iwl100_bg_cfg = {
        .ops = &iwl1000_ops,
        .mod_params = &iwlagn_mod_params,
        .base_params = &iwl1000_base_params,
+       .use_new_eeprom_reading = true,
 };
 
 MODULE_FIRMWARE(IWL1000_MODULE_FIRMWARE(IWL1000_UCODE_API_MAX));

diff --git a/drivers/net/wireless/iwlwifi/iwl-6000.c b/drivers/net/wireless/iwlwifi/iwl-6000.c
index 11e6532fc573d1ed93d5ec4aaf886342d0fe8073..0ceeaac85eda1ab8a8dd8a046044b47dc5e5df63 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-6000.c
+++ b/drivers/net/wireless/iwlwifi/iwl-6000.c
@@ -561,6 +561,7 @@ struct iwl_cfg iwl6000g2a_2agn_cfg = {
        .ht_params = &iwl6000_ht_params,
        .need_dc_calib = true,
        .need_temp_offset_calib = true,
+       .use_new_eeprom_reading = true,
 };
 
 struct iwl_cfg iwl6000g2a_2abg_cfg = {
@@ -578,6 +579,7 @@ struct iwl_cfg iwl6000g2a_2abg_cfg = {
        .base_params = &iwl6000_base_params,
        .need_dc_calib = true,
        .need_temp_offset_calib = true,
+       .use_new_eeprom_reading = true,
 };
 
 struct iwl_cfg iwl6000g2a_2bg_cfg = {
@@ -595,6 +597,7 @@ struct iwl_cfg iwl6000g2a_2bg_cfg = {
        .base_params = &iwl6000_base_params,
        .need_dc_calib = true,
        .need_temp_offset_calib = true,
+       .use_new_eeprom_reading = true,
 };
 
 struct iwl_cfg iwl6000g2b_2agn_cfg = {
@@ -616,6 +619,7 @@ struct iwl_cfg iwl6000g2b_2agn_cfg = {
        .need_temp_offset_calib = true,
        /* Due to bluetooth, we transmit 2.4 GHz probes only on antenna A */
        .scan_tx_antennas[IEEE80211_BAND_2GHZ] = ANT_A,
+       .use_new_eeprom_reading = true,
 };
 
 struct iwl_cfg iwl6000g2b_2abg_cfg = {
@@ -636,6 +640,7 @@ struct iwl_cfg iwl6000g2b_2abg_cfg = {
        .need_temp_offset_calib = true,
        /* Due to bluetooth, we transmit 2.4 GHz probes only on antenna A */
        .scan_tx_antennas[IEEE80211_BAND_2GHZ] = ANT_A,
+       .use_new_eeprom_reading = true,
 };
 
 struct iwl_cfg iwl6000g2b_2bgn_cfg = {
@@ -657,6 +662,7 @@ struct iwl_cfg iwl6000g2b_2bgn_cfg = {
        .need_temp_offset_calib = true,
        /* Due to bluetooth, we transmit 2.4 GHz probes only on antenna A */
        .scan_tx_antennas[IEEE80211_BAND_2GHZ] = ANT_A,
+       .use_new_eeprom_reading = true,
 };
 
 struct iwl_cfg iwl6000g2b_2bg_cfg = {
@@ -677,6 +683,7 @@ struct iwl_cfg iwl6000g2b_2bg_cfg = {
        .need_temp_offset_calib = true,
        /* Due to bluetooth, we transmit 2.4 GHz probes only on antenna A */
        .scan_tx_antennas[IEEE80211_BAND_2GHZ] = ANT_A,
+       .use_new_eeprom_reading = true,
 };
 
 struct iwl_cfg iwl6000g2b_bgn_cfg = {
@@ -698,6 +705,7 @@ struct iwl_cfg iwl6000g2b_bgn_cfg = {
        .need_temp_offset_calib = true,
        /* Due to bluetooth, we transmit 2.4 GHz probes only on antenna A */
        .scan_tx_antennas[IEEE80211_BAND_2GHZ] = ANT_A,
+       .use_new_eeprom_reading = true,
 };
 
 struct iwl_cfg iwl6000g2b_bg_cfg = {
@@ -718,6 +726,7 @@ struct iwl_cfg iwl6000g2b_bg_cfg = {
        .need_temp_offset_calib = true,
        /* Due to bluetooth, we transmit 2.4 GHz probes only on antenna A */
        .scan_tx_antennas[IEEE80211_BAND_2GHZ] = ANT_A,
+       .use_new_eeprom_reading = true,
 };
 
 /*
@@ -804,6 +813,7 @@ struct iwl_cfg iwl6050g2_bgn_cfg = {
        .base_params = &iwl6050_base_params,
        .ht_params = &iwl6000_ht_params,
        .need_dc_calib = true,
+       .use_new_eeprom_reading = true,
 };
 
 struct iwl_cfg iwl6050_2abg_cfg = {
@@ -857,6 +867,7 @@ struct iwl_cfg iwl130_bgn_cfg = {
        .need_dc_calib = true,
        /* Due to bluetooth, we transmit 2.4 GHz probes only on antenna A */
        .scan_tx_antennas[IEEE80211_BAND_2GHZ] = ANT_A,
+       .use_new_eeprom_reading = true,
 };
 
 struct iwl_cfg iwl130_bg_cfg = {
@@ -876,6 +887,7 @@ struct iwl_cfg iwl130_bg_cfg = {
        .need_dc_calib = true,
        /* Due to bluetooth, we transmit 2.4 GHz probes only on antenna A */
        .scan_tx_antennas[IEEE80211_BAND_2GHZ] = ANT_A,
+       .use_new_eeprom_reading = true,
 };
 
 MODULE_FIRMWARE(IWL6000_MODULE_FIRMWARE(IWL6000_UCODE_API_MAX));

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-eeprom.c b/drivers/net/wireless/iwlwifi/iwl-agn-eeprom.c
index 96510600b7512f6bf1f8598009f70855866d2bc8..9eeeda18748de6fb12a09cc5f5b74c90553a4bf4 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-agn-eeprom.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn-eeprom.c
@@ -392,7 +392,7 @@ static s8 iwl_update_channel_txpower(struct iwl_priv *priv,
 /**
  * iwlcore_eeprom_enhanced_txpower: process enhanced tx power info
  */
-void iwlcore_eeprom_enhanced_txpower(struct iwl_priv *priv)
+static void iwlcore_eeprom_enhanced_txpower_old(struct iwl_priv *priv)
 {
        int eeprom_section_count = 0;
        int section, element;
@@ -453,3 +453,86 @@ void iwlcore_eeprom_enhanced_txpower(struct iwl_priv *priv)
                }
        }
 }
+
+static void
+iwlcore_eeprom_enh_txp_read_element(struct iwl_priv *priv,
+                                   struct iwl_eeprom_enhanced_txpwr *txp,
+                                   s8 max_txpower_avg)
+{
+       int ch_idx;
+       bool is_ht40 = txp->flags & IWL_EEPROM_ENH_TXP_FL_40MHZ;
+       enum ieee80211_band band;
+
+       band = txp->flags & IWL_EEPROM_ENH_TXP_FL_BAND_52G ?
+               IEEE80211_BAND_5GHZ : IEEE80211_BAND_2GHZ;
+
+       for (ch_idx = 0; ch_idx < priv->channel_count; ch_idx++) {
+               struct iwl_channel_info *ch_info = &priv->channel_info[ch_idx];
+
+               /* update matching channel or from common data only */
+               if (txp->channel != 0 && ch_info->channel != txp->channel)
+                       continue;
+
+               /* update matching band only */
+               if (band != ch_info->band)
+                       continue;
+
+               if (ch_info->max_power_avg < max_txpower_avg && !is_ht40) {
+                       ch_info->max_power_avg = max_txpower_avg;
+                       ch_info->curr_txpow = max_txpower_avg;
+                       ch_info->scan_power = max_txpower_avg;
+               }
+
+               if (is_ht40 && ch_info->ht40_max_power_avg < max_txpower_avg)
+                       ch_info->ht40_max_power_avg = max_txpower_avg;
+       }
+}
+
+#define EEPROM_TXP_OFFS        (0x00 | INDIRECT_ADDRESS | INDIRECT_TXP_LIMIT)
+#define EEPROM_TXP_ENTRY_LEN sizeof(struct iwl_eeprom_enhanced_txpwr)
+#define EEPROM_TXP_SZ_OFFS (0x00 | INDIRECT_ADDRESS | INDIRECT_TXP_LIMIT_SIZE)
+
+static void iwlcore_eeprom_enhanced_txpower_new(struct iwl_priv *priv)
+{
+       struct iwl_eeprom_enhanced_txpwr *txp_array, *txp;
+       int idx, entries;
+       __le16 *txp_len;
+       s8 max_txp_avg, max_txp_avg_halfdbm;
+
+       BUILD_BUG_ON(sizeof(struct iwl_eeprom_enhanced_txpwr) != 8);
+
+       /* the length is in 16-bit words, but we want entries */
+       txp_len = (__le16 *) iwlagn_eeprom_query_addr(priv, EEPROM_TXP_SZ_OFFS);
+       entries = le16_to_cpup(txp_len) * 2 / EEPROM_TXP_ENTRY_LEN;
+
+       txp_array = (void *) iwlagn_eeprom_query_addr(priv, EEPROM_TXP_OFFS);
+       for (idx = 0; idx < entries; idx++) {
+               txp = &txp_array[idx];
+
+               /* skip invalid entries */
+               if (!(txp->flags & IWL_EEPROM_ENH_TXP_FL_VALID))
+                       continue;
+
+               max_txp_avg = iwl_get_max_txpower_avg(priv, txp_array, idx,
+                                                     &max_txp_avg_halfdbm);
+
+               /*
+                * Update the user limit values values to the highest
+                * power supported by any channel
+                */
+               if (max_txp_avg > priv->tx_power_user_lmt)
+                       priv->tx_power_user_lmt = max_txp_avg;
+               if (max_txp_avg_halfdbm > priv->tx_power_lmt_in_half_dbm)
+                       priv->tx_power_lmt_in_half_dbm = max_txp_avg_halfdbm;
+
+               iwlcore_eeprom_enh_txp_read_element(priv, txp, max_txp_avg);
+       }
+}
+
+void iwlcore_eeprom_enhanced_txpower(struct iwl_priv *priv)
+{
+       if (priv->cfg->use_new_eeprom_reading)
+               iwlcore_eeprom_enhanced_txpower_new(priv);
+       else
+               iwlcore_eeprom_enhanced_txpower_old(priv);
+}

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-lib.c b/drivers/net/wireless/iwlwifi/iwl-agn-lib.c
index b555edd533547e3bf98eed8e948a276ef141aace..554afb7d9670dff564873b9509cd59c3058a346e 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-agn-lib.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn-lib.c
@@ -569,6 +569,12 @@ static u32 eeprom_indirect_address(const struct iwl_priv *priv, u32 address)
        case INDIRECT_REGULATORY:
                offset = iwl_eeprom_query16(priv, EEPROM_LINK_REGULATORY);
                break;
+       case INDIRECT_TXP_LIMIT:
+               offset = iwl_eeprom_query16(priv, EEPROM_LINK_TXP_LIMIT);
+               break;
+       case INDIRECT_TXP_LIMIT_SIZE:
+               offset = iwl_eeprom_query16(priv, EEPROM_LINK_TXP_LIMIT_SIZE);
+               break;
        case INDIRECT_CALIBRATION:
                offset = iwl_eeprom_query16(priv, EEPROM_LINK_CALIBRATION);
                break;

diff --git a/drivers/net/wireless/iwlwifi/iwl-core.h b/drivers/net/wireless/iwlwifi/iwl-core.h
index 64527def059f7de76ac0e4bdcadd0147576805c1..954ecc2c34c41f239dc1d24932d67be68aa741fa 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-core.h
+++ b/drivers/net/wireless/iwlwifi/iwl-core.h
@@ -390,6 +390,7 @@ struct iwl_cfg {
        const bool need_temp_offset_calib; /* if used set to true */
        u8 scan_rx_antennas[IEEE80211_NUM_BANDS];
        u8 scan_tx_antennas[IEEE80211_NUM_BANDS];
+       const bool use_new_eeprom_reading; /* temporary, remove later */
 };
 
 /***************************

diff --git a/drivers/net/wireless/iwlwifi/iwl-eeprom.h b/drivers/net/wireless/iwlwifi/iwl-eeprom.h
index 310e34568a41feb9f64e9ffb57394a1b8df13634..e3a279d2d0b6307fcf5d38948454cb7ba8da29c7 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-eeprom.h
+++ b/drivers/net/wireless/iwlwifi/iwl-eeprom.h
@@ -120,6 +120,17 @@ struct iwl_eeprom_channel {
        s8 max_power_avg;       /* max power (dBm) on this chnl, limit 31 */
 } __packed;
 
+enum iwl_eeprom_enhanced_txpwr_flags {
+       IWL_EEPROM_ENH_TXP_FL_VALID             = BIT(0),
+       IWL_EEPROM_ENH_TXP_FL_BAND_52G          = BIT(1),
+       IWL_EEPROM_ENH_TXP_FL_OFDM              = BIT(2),
+       IWL_EEPROM_ENH_TXP_FL_40MHZ             = BIT(3),
+       IWL_EEPROM_ENH_TXP_FL_HT_AP             = BIT(4),
+       IWL_EEPROM_ENH_TXP_FL_RES1              = BIT(5),
+       IWL_EEPROM_ENH_TXP_FL_RES2              = BIT(6),
+       IWL_EEPROM_ENH_TXP_FL_COMMON_TYPE       = BIT(7),
+};
+
 /**
  * iwl_eeprom_enhanced_txpwr structure
  *    This structure presents the enhanced regulatory tx power limit layout
@@ -188,6 +199,8 @@ struct iwl_eeprom_enhanced_txpwr {
 #define EEPROM_LINK_CALIBRATION      (2*0x67)
 #define EEPROM_LINK_PROCESS_ADJST    (2*0x68)
 #define EEPROM_LINK_OTHERS           (2*0x69)
+#define EEPROM_LINK_TXP_LIMIT        (2*0x6a)
+#define EEPROM_LINK_TXP_LIMIT_SIZE   (2*0x6b)
 
 /* agn regulatory - indirect access */
 #define EEPROM_REG_BAND_1_CHANNELS       ((0x08)\
@@ -391,6 +404,8 @@ struct iwl_eeprom_calib_info {
 #define INDIRECT_CALIBRATION        0x00040000
 #define INDIRECT_PROCESS_ADJST      0x00050000
 #define INDIRECT_OTHERS             0x00060000
+#define INDIRECT_TXP_LIMIT          0x00070000
+#define INDIRECT_TXP_LIMIT_SIZE     0x00080000
 #define INDIRECT_ADDRESS            0x00100000
 
 /* General */