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From:   Manikanta Pubbisetty <quic_mpubbise@quicinc.com>
To:     <ath11k@lists.infradead.org>
CC:     <linux-wireless@vger.kernel.org>,
        Manikanta Pubbisetty <quic_mpubbise@quicinc.com>
Subject: [PATCH 2/4] ath11k: Move hardware initialization logic to start()
Date:   Wed, 20 Jul 2022 19:19:57 +0530
Message-ID: <20220720134959.15688-3-quic_mpubbise@quicinc.com>
In-Reply-To: <20220720134959.15688-1-quic_mpubbise@quicinc.com>
References: <20220720134959.15688-1-quic_mpubbise@quicinc.com>
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Currently during recovery, hardware is re-initialized as part of
ath11k_core_reconfigure_on_crash(). In order to enable low power
mode support in the driver, it is required to move the hardware
re-initialization logic to ath11k_ops.start() hook.

Since ath11k_ops.start() hook is called during WiFi ON/resume and
also during hardware recovery, it is better to defer the hardware
initialization to ath11k_ops.start() in the case of hardware recovery.
This will help ensure that there is only path for the initialization
of the hardware across different scenarios. A future patch will add
the support of initializing the hardware from start() hook in
WiFi ON/resume cases as well.

Commit 38194f3a605e ("ath11k: add synchronization operation between
reconfigure of mac80211 and ath11k_base") introduced a similar change that
applies just to QCA6390/WCN6855 to defer the initialization of the hardware
during recovery by using wait logic. This is no more needed and therefore
remove it.

Tested-on: WCN6750 hw1.0 AHB WLAN.MSL.1.0.1-00887-QCAMSLSWPLZ-1

Signed-off-by: Manikanta Pubbisetty <quic_mpubbise@quicinc.com>
---
 drivers/net/wireless/ath/ath11k/core.c | 87 +++++++++++---------------
 drivers/net/wireless/ath/ath11k/core.h |  6 +-
 drivers/net/wireless/ath/ath11k/mac.c  | 29 +++------
 3 files changed, 44 insertions(+), 78 deletions(-)

diff --git a/drivers/net/wireless/ath/ath11k/core.c b/drivers/net/wireless/ath/ath11k/core.c
index c8e0bc935838..f4f88a19539e 100644
--- a/drivers/net/wireless/ath/ath11k/core.c
+++ b/drivers/net/wireless/ath/ath11k/core.c
@@ -1498,10 +1498,8 @@ int ath11k_core_qmi_firmware_ready(struct ath11k_base *ab)
 	return ret;
 }
 
-static int ath11k_core_reconfigure_on_crash(struct ath11k_base *ab)
+static void ath11k_core_reconfigure_on_crash(struct ath11k_base *ab)
 {
-	int ret;
-
 	mutex_lock(&ab->core_lock);
 	ath11k_thermal_unregister(ab);
 	ath11k_hif_irq_disable(ab);
@@ -1513,27 +1511,8 @@ static int ath11k_core_reconfigure_on_crash(struct ath11k_base *ab)
 	mutex_unlock(&ab->core_lock);
 
 	ath11k_dp_free(ab);
-	ath11k_hal_srng_deinit(ab);
 
 	ab->free_vdev_map = (1LL << (ab->num_radios * TARGET_NUM_VDEVS(ab))) - 1;
-
-	ret = ath11k_hal_srng_init(ab);
-	if (ret)
-		return ret;
-
-	clear_bit(ATH11K_FLAG_CRASH_FLUSH, &ab->dev_flags);
-
-	ret = ath11k_core_qmi_firmware_ready(ab);
-	if (ret)
-		goto err_hal_srng_deinit;
-
-	clear_bit(ATH11K_FLAG_RECOVERY, &ab->dev_flags);
-
-	return 0;
-
-err_hal_srng_deinit:
-	ath11k_hal_srng_deinit(ab);
-	return ret;
 }
 
 void ath11k_core_halt(struct ath11k *ar)
@@ -1694,22 +1673,10 @@ static void ath11k_core_post_reconfigure_recovery(struct ath11k_base *ab)
 static void ath11k_core_restart(struct work_struct *work)
 {
 	struct ath11k_base *ab = container_of(work, struct ath11k_base, restart_work);
-	int ret;
-
-	if (!ab->is_reset)
-		ath11k_core_pre_reconfigure_recovery(ab);
-
-	ret = ath11k_core_reconfigure_on_crash(ab);
-	if (ret) {
-		ath11k_err(ab, "failed to reconfigure driver on crash recovery\n");
-		return;
-	}
-
-	if (ab->is_reset)
-		complete_all(&ab->reconfigure_complete);
 
-	if (!ab->is_reset)
-		ath11k_core_post_reconfigure_recovery(ab);
+	ath11k_core_pre_reconfigure_recovery(ab);
+	ath11k_core_reconfigure_on_crash(ab);
+	ath11k_core_post_reconfigure_recovery(ab);
 }
 
 static void ath11k_core_reset(struct work_struct *work)
@@ -1763,18 +1730,6 @@ static void ath11k_core_reset(struct work_struct *work)
 
 	ab->is_reset = true;
 	atomic_set(&ab->recovery_count, 0);
-	reinit_completion(&ab->recovery_start);
-	atomic_set(&ab->recovery_start_count, 0);
-
-	ath11k_core_pre_reconfigure_recovery(ab);
-
-	reinit_completion(&ab->reconfigure_complete);
-	ath11k_core_post_reconfigure_recovery(ab);
-
-	ath11k_dbg(ab, ATH11K_DBG_BOOT, "waiting recovery start...\n");
-
-	time_left = wait_for_completion_timeout(&ab->recovery_start,
-						ATH11K_RECOVER_START_TIMEOUT_HZ);
 
 	ath11k_hif_power_down(ab);
 	ath11k_hif_power_up(ab);
@@ -1882,8 +1837,6 @@ struct ath11k_base *ath11k_core_alloc(struct device *dev, size_t priv_size,
 	spin_lock_init(&ab->base_lock);
 	mutex_init(&ab->vdev_id_11d_lock);
 	init_completion(&ab->reset_complete);
-	init_completion(&ab->reconfigure_complete);
-	init_completion(&ab->recovery_start);
 
 	INIT_LIST_HEAD(&ab->peers);
 	init_waitqueue_head(&ab->peer_mapping_wq);
@@ -1910,5 +1863,37 @@ struct ath11k_base *ath11k_core_alloc(struct device *dev, size_t priv_size,
 }
 EXPORT_SYMBOL(ath11k_core_alloc);
 
+int ath11k_core_start_device(struct ath11k_base *ab)
+{
+	int ret;
+
+	if (!test_bit(ATH11K_FLAG_RECOVERY, &ab->dev_flags))
+		return 0;
+
+	ath11k_hal_srng_deinit(ab);
+
+	ret = ath11k_hal_srng_init(ab);
+	if (ret) {
+		ath11k_err(ab, "failed to init srng: %d\n", ret);
+		return ret;
+	}
+
+	clear_bit(ATH11K_FLAG_CRASH_FLUSH, &ab->dev_flags);
+
+	ret = ath11k_core_qmi_firmware_ready(ab);
+	if (ret) {
+		ath11k_err(ab, "failed to init core: %d\n", ret);
+		goto err_hal_srng_deinit;
+	}
+
+	clear_bit(ATH11K_FLAG_RECOVERY, &ab->dev_flags);
+
+	return 0;
+
+err_hal_srng_deinit:
+	ath11k_hal_srng_deinit(ab);
+	return ret;
+}
+
 MODULE_DESCRIPTION("Core module for Qualcomm Atheros 802.11ax wireless LAN cards.");
 MODULE_LICENSE("Dual BSD/GPL");
diff --git a/drivers/net/wireless/ath/ath11k/core.h b/drivers/net/wireless/ath/ath11k/core.h
index 2bd5eb9df4d4..5ecb60a1b51d 100644
--- a/drivers/net/wireless/ath/ath11k/core.h
+++ b/drivers/net/wireless/ath/ath11k/core.h
@@ -60,8 +60,6 @@ extern unsigned int ath11k_frame_mode;
 #define ATH11K_RESET_MAX_FAIL_COUNT_FIRST 3
 #define ATH11K_RESET_MAX_FAIL_COUNT_FINAL 5
 #define ATH11K_RESET_FAIL_TIMEOUT_HZ (20 * HZ)
-#define ATH11K_RECONFIGURE_TIMEOUT_HZ (10 * HZ)
-#define ATH11K_RECOVER_START_TIMEOUT_HZ (20 * HZ)
 
 enum ath11k_supported_bw {
 	ATH11K_BW_20	= 0,
@@ -913,11 +911,8 @@ struct ath11k_base {
 	struct work_struct reset_work;
 	atomic_t reset_count;
 	atomic_t recovery_count;
-	atomic_t recovery_start_count;
 	bool is_reset;
 	struct completion reset_complete;
-	struct completion reconfigure_complete;
-	struct completion recovery_start;
 	/* continuous recovery fail count */
 	atomic_t fail_cont_count;
 	unsigned long reset_fail_timeout;
@@ -1144,6 +1139,7 @@ int ath11k_core_check_smbios(struct ath11k_base *ab);
 void ath11k_core_halt(struct ath11k *ar);
 int ath11k_core_resume(struct ath11k_base *ab);
 int ath11k_core_suspend(struct ath11k_base *ab);
+int ath11k_core_start_device(struct ath11k_base *ab);
 
 const struct firmware *ath11k_core_firmware_request(struct ath11k_base *ab,
 						    const char *filename);
diff --git a/drivers/net/wireless/ath/ath11k/mac.c b/drivers/net/wireless/ath/ath11k/mac.c
index d83d3c944594..84f2604a16e4 100644
--- a/drivers/net/wireless/ath/ath11k/mac.c
+++ b/drivers/net/wireless/ath/ath11k/mac.c
@@ -5753,27 +5753,6 @@ static int ath11k_mac_config_mon_status_default(struct ath11k *ar, bool enable)
 	return ret;
 }
 
-static void ath11k_mac_wait_reconfigure(struct ath11k_base *ab)
-{
-	int recovery_start_count;
-
-	if (!ab->is_reset)
-		return;
-
-	recovery_start_count = atomic_inc_return(&ab->recovery_start_count);
-	ath11k_dbg(ab, ATH11K_DBG_MAC, "recovery start count %d\n", recovery_start_count);
-
-	if (recovery_start_count == ab->num_radios) {
-		complete(&ab->recovery_start);
-		ath11k_dbg(ab, ATH11K_DBG_MAC, "recovery started success\n");
-	}
-
-	ath11k_dbg(ab, ATH11K_DBG_MAC, "waiting reconfigure...\n");
-
-	wait_for_completion_timeout(&ab->reconfigure_complete,
-				    ATH11K_RECONFIGURE_TIMEOUT_HZ);
-}
-
 static int ath11k_mac_op_start(struct ieee80211_hw *hw)
 {
 	struct ath11k *ar = hw->priv;
@@ -5782,6 +5761,13 @@ static int ath11k_mac_op_start(struct ieee80211_hw *hw)
 	int ret;
 
 	ath11k_mac_drain_tx(ar);
+
+	ret = ath11k_core_start_device(ab);
+	if (ret) {
+		ath11k_err(ab, "failed to start device : %d\n", ret);
+		return ret;
+	}
+
 	mutex_lock(&ar->conf_mutex);
 
 	switch (ar->state) {
@@ -5790,7 +5776,6 @@ static int ath11k_mac_op_start(struct ieee80211_hw *hw)
 		break;
 	case ATH11K_STATE_RESTARTING:
 		ar->state = ATH11K_STATE_RESTARTED;
-		ath11k_mac_wait_reconfigure(ab);
 		break;
 	case ATH11K_STATE_RESTARTED:
 	case ATH11K_STATE_WEDGED:
-- 
2.35.1