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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>
This commit is contained in:
Emmanuel Grumbach 2015-02-08 10:56:43 +02:00
parent 0522588d2f
commit ddf89ab10a
3 changed files with 57 additions and 0 deletions
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54
drivers/net/wireless/iwlwifi/mvm/debugfs-vif.c
View File

@ -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)

1
drivers/net/wireless/iwlwifi/mvm/mvm.h
View File

@ -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];

2
drivers/net/wireless/iwlwifi/mvm/phy-ctxt.c
View File

@ -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));
}