From:   Siva Rebbagondla <siva8118@gmail.com>
To:     Kalle Valo <kvalo@codeaurora.org>
Cc:     linux-wireless@vger.kernel.org, rishikesh.basu@redpinesignals.com,
        siva.rebbagondla@redpinesignals.com,
        krishna.pedda@redpinesignals.com, amitkarwar@gmail.com
Subject: [v3 4/5] rsi: resolve power save issue after S4 resume
Date:   Mon,  4 Feb 2019 12:03:28 +0530
Message-Id: <1549262009-8766-5-git-send-email-siva8118@gmail.com>
In-Reply-To: <1549262009-8766-1-git-send-email-siva8118@gmail.com>
References: <1549262009-8766-1-git-send-email-siva8118@gmail.com>
Sender: linux-wireless-owner@vger.kernel.org
Precedence: bulk

From: Siva Rebbagondla <siva.rebbagondla@redpinesignals.com>

We are redownloading the firmware after S4 restore and observed in
stress test that mac80211 sometimes gives power save request after
resume which causes the firmware in bad state. mac_ops_resumed flag
is added to skip that request until initialisation is done and Keeping
power save state is NONE.

Signed-off-by: Siva Rebbagondla <siva.rebbagondla@redpinesignals.com>
---
 drivers/net/wireless/rsi/rsi_91x_mac80211.c | 9 ++++++++-
 drivers/net/wireless/rsi/rsi_91x_sdio.c     | 1 +
 drivers/net/wireless/rsi/rsi_main.h         | 1 +
 3 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/rsi/rsi_91x_mac80211.c b/drivers/net/wireless/rsi/rsi_91x_mac80211.c
index 8d1282f..7bc8da6 100644
--- a/drivers/net/wireless/rsi/rsi_91x_mac80211.c
+++ b/drivers/net/wireless/rsi/rsi_91x_mac80211.c
@@ -239,6 +239,7 @@ static int rsi_mac80211_hw_scan_start(struct ieee80211_hw *hw,
 	struct ieee80211_bss_conf *bss = &vif->bss_conf;
 
 	rsi_dbg(INFO_ZONE, "***** Hardware scan start *****\n");
+	common->mac_ops_resumed = false;
 
 	if (common->fsm_state != FSM_MAC_INIT_DONE)
 		return -ENODEV;
@@ -370,6 +371,10 @@ static void rsi_mac80211_tx(struct ieee80211_hw *hw,
 {
 	struct rsi_hw *adapter = hw->priv;
 	struct rsi_common *common = adapter->priv;
+	struct ieee80211_hdr *wlh = (struct ieee80211_hdr *)skb->data;
+
+	if (ieee80211_is_auth(wlh->frame_control))
+		common->mac_ops_resumed = false;
 
 	rsi_core_xmit(common, skb);
 }
@@ -677,7 +682,8 @@ static int rsi_mac80211_config(struct ieee80211_hw *hw,
 	}
 
 	/* Power save parameters */
-	if (changed & IEEE80211_CONF_CHANGE_PS) {
+	if ((changed & IEEE80211_CONF_CHANGE_PS) &&
+	    !common->mac_ops_resumed) {
 		struct ieee80211_vif *vif, *sta_vif = NULL;
 		unsigned long flags;
 		int i, set_ps = 1;
@@ -1939,6 +1945,7 @@ static int rsi_mac80211_resume(struct ieee80211_hw *hw)
 	rsi_dbg(INFO_ZONE, "%s: mac80211 resume\n", __func__);
 
 	if (common->hibernate_resume) {
+		common->mac_ops_resumed = true;
 		/* Device need a complete restart of all MAC operations.
 		 * returning 1 will serve this purpose.
 		 */
diff --git a/drivers/net/wireless/rsi/rsi_91x_sdio.c b/drivers/net/wireless/rsi/rsi_91x_sdio.c
index 449803c..764ad06 100644
--- a/drivers/net/wireless/rsi/rsi_91x_sdio.c
+++ b/drivers/net/wireless/rsi/rsi_91x_sdio.c
@@ -1396,6 +1396,7 @@ static int rsi_restore(struct device *dev)
 	common->iface_down = true;
 
 	adapter->sc_nvifs = 0;
+	adapter->ps_state = PS_NONE;
 
 	common->wow_flags = 0;
 	common->iface_down = false;
diff --git a/drivers/net/wireless/rsi/rsi_main.h b/drivers/net/wireless/rsi/rsi_main.h
index 4dc0c01..35d13f3 100644
--- a/drivers/net/wireless/rsi/rsi_main.h
+++ b/drivers/net/wireless/rsi/rsi_main.h
@@ -311,6 +311,7 @@ struct rsi_common {
 	struct cfg80211_scan_request *hwscan;
 	struct rsi_bgscan_params bgscan;
 	u8 bgscan_en;
+	u8 mac_ops_resumed;
 };
 
 struct eepromrw_info {
-- 
2.5.5