iwlwifi: mvm: allow to force the Rx chains from debugfs
This is useful to debug weird antenna problems.
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
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 @@
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(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 @@
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_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 @@
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));
}