From ddf89ab10a93e8bb0ecf91a563a71d1cfb604c9f Mon Sep 17 00:00:00 2001 From: Emmanuel Grumbach Date: Sun, 8 Feb 2015 10:56:43 +0200 Subject: [PATCH] iwlwifi: mvm: allow to force the Rx chains from debugfs This is useful to debug weird antenna problems. Signed-off-by: Emmanuel Grumbach --- drivers/net/wireless/iwlwifi/mvm/debugfs-vif.c | 54 ++++++++++++++++++++++++++ drivers/net/wireless/iwlwifi/mvm/mvm.h | 1 + drivers/net/wireless/iwlwifi/mvm/phy-ctxt.c | 2 + 3 files changed, 57 insertions(+) diff --git a/drivers/net/wireless/iwlwifi/mvm/debugfs-vif.c b/drivers/net/wireless/iwlwifi/mvm/debugfs-vif.c index 5fe1459..7faad90 100644 --- a/drivers/net/wireless/iwlwifi/mvm/debugfs-vif.c +++ b/drivers/net/wireless/iwlwifi/mvm/debugfs-vif.c @@ -545,6 +545,57 @@ static ssize_t iwl_dbgfs_uapsd_misbehaving_write(struct ieee80211_vif *vif, return ret ? count : -EINVAL; } +static ssize_t iwl_dbgfs_rx_phyinfo_write(struct ieee80211_vif *vif, char *buf, + size_t count, loff_t *ppos) +{ + struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif); + struct iwl_mvm *mvm = mvmvif->mvm; + struct ieee80211_chanctx_conf *chanctx_conf; + struct iwl_mvm_phy_ctxt *phy_ctxt; + u16 value; + int ret; + + ret = kstrtou16(buf, 0, &value); + if (ret) + return ret; + + mutex_lock(&mvm->mutex); + rcu_read_lock(); + + chanctx_conf = rcu_dereference(vif->chanctx_conf); + /* make sure the channel context is assigned */ + if (!chanctx_conf) { + rcu_read_unlock(); + mutex_unlock(&mvm->mutex); + return -EINVAL; + } + + phy_ctxt = &mvm->phy_ctxts[*(u16 *)chanctx_conf->drv_priv]; + rcu_read_unlock(); + + mvm->dbgfs_rx_phyinfo = value; + + ret = iwl_mvm_phy_ctxt_changed(mvm, phy_ctxt, &chanctx_conf->min_def, + chanctx_conf->rx_chains_static, + chanctx_conf->rx_chains_dynamic); + mutex_unlock(&mvm->mutex); + + return ret ?: count; +} + +static ssize_t iwl_dbgfs_rx_phyinfo_read(struct file *file, + char __user *user_buf, + size_t count, loff_t *ppos) +{ + struct ieee80211_vif *vif = file->private_data; + struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif); + char buf[8]; + + snprintf(buf, sizeof(buf), "0x%04x\n", mvmvif->mvm->dbgfs_rx_phyinfo); + + return simple_read_from_buffer(user_buf, count, ppos, buf, sizeof(buf)); +} + #define MVM_DEBUGFS_WRITE_FILE_OPS(name, bufsz) \ _MVM_DEBUGFS_WRITE_FILE_OPS(name, bufsz, struct ieee80211_vif) #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \ @@ -560,6 +611,7 @@ MVM_DEBUGFS_READ_WRITE_FILE_OPS(pm_params, 32); MVM_DEBUGFS_READ_WRITE_FILE_OPS(bf_params, 256); MVM_DEBUGFS_READ_WRITE_FILE_OPS(low_latency, 10); MVM_DEBUGFS_READ_WRITE_FILE_OPS(uapsd_misbehaving, 20); +MVM_DEBUGFS_READ_WRITE_FILE_OPS(rx_phyinfo, 10); void iwl_mvm_vif_dbgfs_register(struct iwl_mvm *mvm, struct ieee80211_vif *vif) { @@ -595,6 +647,8 @@ void iwl_mvm_vif_dbgfs_register(struct iwl_mvm *mvm, struct ieee80211_vif *vif) S_IRUSR | S_IWUSR); MVM_DEBUGFS_ADD_FILE_VIF(uapsd_misbehaving, mvmvif->dbgfs_dir, S_IRUSR | S_IWUSR); + MVM_DEBUGFS_ADD_FILE_VIF(rx_phyinfo, mvmvif->dbgfs_dir, + S_IRUSR | S_IWUSR); if (vif->type == NL80211_IFTYPE_STATION && !vif->p2p && mvmvif == mvm->bf_allowed_vif) diff --git a/drivers/net/wireless/iwlwifi/mvm/mvm.h b/drivers/net/wireless/iwlwifi/mvm/mvm.h index f78a006..885d096 100644 --- a/drivers/net/wireless/iwlwifi/mvm/mvm.h +++ b/drivers/net/wireless/iwlwifi/mvm/mvm.h @@ -681,6 +681,7 @@ struct iwl_mvm { struct iwl_mvm_frame_stats drv_rx_stats; spinlock_t drv_stats_lock; + u16 dbgfs_rx_phyinfo; #endif struct iwl_mvm_phy_ctxt phy_ctxts[NUM_PHY_CTX]; diff --git a/drivers/net/wireless/iwlwifi/mvm/phy-ctxt.c b/drivers/net/wireless/iwlwifi/mvm/phy-ctxt.c index 5b43616..1bd10ed 100644 --- a/drivers/net/wireless/iwlwifi/mvm/phy-ctxt.c +++ b/drivers/net/wireless/iwlwifi/mvm/phy-ctxt.c @@ -175,6 +175,8 @@ static void iwl_mvm_phy_ctxt_cmd_data(struct iwl_mvm *mvm, cmd->rxchain_info |= cpu_to_le32(idle_cnt << PHY_RX_CHAIN_CNT_POS); cmd->rxchain_info |= cpu_to_le32(active_cnt << PHY_RX_CHAIN_MIMO_CNT_POS); + if (unlikely(mvm->dbgfs_rx_phyinfo)) + cmd->rxchain_info = cpu_to_le32(mvm->dbgfs_rx_phyinfo); cmd->txchain_info = cpu_to_le32(iwl_mvm_get_valid_tx_ant(mvm)); } -- 2.7.4