linux-kernel - [PATCH] wifi: iwlwifi: mvm: fix power save for MLD

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Message-ID: <20230822040745.260086-1-sultan@kerneltoast.com>
Date:   Mon, 21 Aug 2023 21:07:41 -0700
From:   Sultan Alsawaf <sultan@...neltoast.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Sultan Alsawaf <sultan@...neltoast.com>,
        Gregory Greenman <gregory.greenman@...el.com>,
        Kalle Valo <kvalo@...nel.org>,
        Johannes Berg <johannes.berg@...el.com>,
        Miri Korenblit <miriam.rachel.korenblit@...el.com>,
        linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] wifi: iwlwifi: mvm: fix power save for MLD

From: Sultan Alsawaf <sultan@...neltoast.com>

The conversion from bss_info_changed() to vif_cfg/link_info_changed()
removed a call to iwl_mvm_bss_info_changed_station_common() from what
became the vif_cfg_changed() path. As a result, BSS_CHANGED_PS and other
power save changes sent via ieee80211_vif_cfg_change_notify() are ignored
for MLD, which breaks power save entirely. This has a noticeable impact on
power consumption, causing idle package power to hover at 10 W on my
i9-13980HX laptop with an AX210 while connected to WiFi.

Add the missing iwl_mvm_bss_info_changed_station_common() call to the
vif_cfg_changed() path to fix power save for MLD. This brings idle package
power down to 1 W on my laptop, a 9 W improvement.

Fixes: 22c588343529 ("wifi: iwlwifi: mvm: replace bss_info_changed() with vif_cfg/link_info_changed()")
Signed-off-by: Sultan Alsawaf <sultan@...neltoast.com>
---
 drivers/net/wireless/intel/iwlwifi/mvm/mld-mac80211.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mld-mac80211.c b/drivers/net/wireless/intel/iwlwifi/mvm/mld-mac80211.c
index 8b6c641772ee..6abc05976870 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mld-mac80211.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mld-mac80211.c
@@ -731,6 +731,8 @@ static void iwl_mvm_mld_vif_cfg_changed_station(struct iwl_mvm *mvm,

 	mvmvif->associated = vif->cfg.assoc;

+	iwl_mvm_bss_info_changed_station_common(mvm, vif, &vif->bss_conf,
+						changes);
 	if (!(changes & BSS_CHANGED_ASSOC))
 		return;

-- 
2.41.0