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iwlwifi: mvm: new api to get signal strength

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A new API that replaces the rx signal strength calculation via agc & rssi.
The energy is now calculated outside the driver and transferred by the fw.

Signed-off-by: Avri Altman <avri.altman@intel.com>
Reviewed-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Avri Altman
2013-07-09 01:42:17 +03:00
committed by Johannes Berg
parent 26e05cc32d
commit a2d7b870d0
3 changed files with 46 additions and 17 deletions
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41
drivers/net/wireless/iwlwifi/mvm/rx.c
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@@ -124,10 +124,6 @@ static void iwl_mvm_pass_packet_to_mac80211(struct iwl_mvm *mvm,
ieee80211_rx_ni(mvm->hw, skb);
}
/*
* iwl_mvm_calc_rssi - calculate the rssi in dBm
* @phy_info: the phy information for the coming packet
*/
static int iwl_mvm_calc_rssi(struct iwl_mvm *mvm,
struct iwl_rx_phy_info *phy_info)
{
@@ -136,12 +132,6 @@ static int iwl_mvm_calc_rssi(struct iwl_mvm *mvm,
u32 agc_a, agc_b, max_agc;
u32 val;
/* Find max rssi among 2 possible receivers.
* These values are measured by the Digital Signal Processor (DSP).
* They should stay fairly constant even as the signal strength varies,
* if the radio's Automatic Gain Control (AGC) is working right.
* AGC value (see below) will provide the "interesting" info.
*/
val = le32_to_cpu(phy_info->non_cfg_phy[IWL_RX_INFO_AGC_IDX]);
agc_a = (val & IWL_OFDM_AGC_A_MSK) >> IWL_OFDM_AGC_A_POS;
agc_b = (val & IWL_OFDM_AGC_B_MSK) >> IWL_OFDM_AGC_B_POS;
@@ -169,6 +159,32 @@ static int iwl_mvm_calc_rssi(struct iwl_mvm *mvm,
return max_rssi_dbm;
}
/*
* iwl_mvm_get_signal_strength - use new rx PHY INFO API
*/
static int iwl_mvm_get_signal_strength(struct iwl_mvm *mvm,
struct iwl_rx_phy_info *phy_info)
{
int energy_a, energy_b, energy_c, max_energy;
u32 val;
val =
le32_to_cpu(phy_info->non_cfg_phy[IWL_RX_INFO_ENERGY_ANT_ABC_IDX]);
energy_a = -((val & IWL_RX_INFO_ENERGY_ANT_A_MSK) >>
IWL_RX_INFO_ENERGY_ANT_A_POS);
energy_b = -((val & IWL_RX_INFO_ENERGY_ANT_B_MSK) >>
IWL_RX_INFO_ENERGY_ANT_B_POS);
energy_c = -((val & IWL_RX_INFO_ENERGY_ANT_C_MSK) >>
IWL_RX_INFO_ENERGY_ANT_C_POS);
max_energy = max(energy_a, energy_b);
max_energy = max(max_energy, energy_c);
IWL_DEBUG_STATS(mvm, "energy In A %d B %d C %d , and max %d\n",
energy_a, energy_b, energy_c, max_energy);
return max_energy;
}
/*
* iwl_mvm_set_mac80211_rx_flag - translate fw status to mac80211 format
* @mvm: the mvm object
@@ -290,7 +306,10 @@ int iwl_mvm_rx_rx_mpdu(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
/*rx_status.flag |= RX_FLAG_MACTIME_MPDU;*/
/* Find max signal strength (dBm) among 3 antenna/receiver chains */
rx_status.signal = iwl_mvm_calc_rssi(mvm, phy_info);
if (mvm->fw->ucode_capa.flags & IWL_UCODE_TLV_FLAGS_RX_ENERGY_API)
rx_status.signal = iwl_mvm_get_signal_strength(mvm, phy_info);
else
rx_status.signal = iwl_mvm_calc_rssi(mvm, phy_info);
IWL_DEBUG_STATS_LIMIT(mvm, "Rssi %d, TSF %llu\n", rx_status.signal,
(unsigned long long)rx_status.mactime);