From 17dbe56445328fcc275f2ca318c06e55d7d403df Mon Sep 17 00:00:00 2001 From: Avri Altman Date: Thu, 1 Aug 2013 07:19:27 +0300 Subject: [PATCH] iwlwifi: mvm: fix signal reporting for < 3 antennas When fewer than three antennas are connected (as is always the case for the current devices), the signal strength reporting was wrong; fix it. Signed-off-by: Avri Altman Signed-off-by: Johannes Berg --- drivers/net/wireless/iwlwifi/mvm/rx.c | 18 ++++++++++++------ 1 file changed, 12 insertions(+), 6 deletions(-) diff --git a/drivers/net/wireless/iwlwifi/mvm/rx.c b/drivers/net/wireless/iwlwifi/mvm/rx.c index 5057fd3bcb50..ee6547d22287 100644 --- a/drivers/net/wireless/iwlwifi/mvm/rx.c +++ b/drivers/net/wireless/iwlwifi/mvm/rx.c @@ -167,6 +167,9 @@ static void iwl_mvm_calc_rssi(struct iwl_mvm *mvm, /* * iwl_mvm_get_signal_strength - use new rx PHY INFO API + * values are reported by the fw as positive values - need to negate + * to obtain their dBM. Account for missing antennas by replacing 0 + * values by -256dBm: practically 0 power and a non-feasible 8 bit value. */ static void iwl_mvm_get_signal_strength(struct iwl_mvm *mvm, struct iwl_rx_phy_info *phy_info, @@ -177,12 +180,15 @@ static void iwl_mvm_get_signal_strength(struct iwl_mvm *mvm, 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); + energy_a = (val & IWL_RX_INFO_ENERGY_ANT_A_MSK) >> + IWL_RX_INFO_ENERGY_ANT_A_POS; + energy_a = energy_a ? -energy_a : -256; + energy_b = (val & IWL_RX_INFO_ENERGY_ANT_B_MSK) >> + IWL_RX_INFO_ENERGY_ANT_B_POS; + energy_b = energy_b ? -energy_b : -256; + energy_c = (val & IWL_RX_INFO_ENERGY_ANT_C_MSK) >> + IWL_RX_INFO_ENERGY_ANT_C_POS; + energy_c = energy_c ? -energy_c : -256; max_energy = max(energy_a, energy_b); max_energy = max(max_energy, energy_c); -- 2.20.1