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Commit 1a095d30 authored by Johannes Berg's avatar Johannes Berg Committed by Emmanuel Grumbach
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iwlwifi: mvm: enable RX chain diversity if needed 



In some situations (see comment) it makes sense to enable both
chains (if available) to get better throughput by having chain
diversity available.

Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
Signed-off-by: default avatarEmmanuel Grumbach <emmanuel.grumbach@intel.com>
parent d6aeb354

drivers/net/wireless/iwlwifi/mvm/phy-ctxt.c

+13 −0
Original line number Original line Diff line number Diff line
@@ -156,6 +156,19 @@ static void iwl_mvm_phy_ctxt_cmd_data(struct iwl_mvm *mvm, 
	idle_cnt = chains_static;

	idle_cnt = chains_static;

	active_cnt = chains_dynamic;

	active_cnt = chains_dynamic;





	/* In scenarios where we only ever use a single-stream rates,

	 * i.e. legacy 11b/g/a associations, single-stream APs or even

	 * static SMPS, enable both chains to get diversity, improving

	 * the case where we're far enough from the AP that attenuation

	 * between the two antennas is sufficiently different to impact

	 * performance.

	 */

	if (active_cnt == 1 && num_of_ant(mvm->fw->valid_rx_ant) > 1 &&

	    !mvm->cfg->rx_with_siso_diversity) {

		idle_cnt = 2;

		active_cnt = 2;

	}



	cmd->rxchain_info = cpu_to_le32(mvm->fw->valid_rx_ant <<

	cmd->rxchain_info = cpu_to_le32(mvm->fw->valid_rx_ant <<

					PHY_RX_CHAIN_VALID_POS);

					PHY_RX_CHAIN_VALID_POS);

	cmd->rxchain_info |= cpu_to_le32(idle_cnt << PHY_RX_CHAIN_CNT_POS);

	cmd->rxchain_info |= cpu_to_le32(idle_cnt << PHY_RX_CHAIN_CNT_POS);