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Date:   Sat, 12 Nov 2022 13:18:13 +0100
From:   Lorenzo Bianconi <lorenzo@kernel.org>
To:     Ryder Lee <ryder.lee@mediatek.com>
Cc:     Felix Fietkau <nbd@nbd.name>, linux-wireless@vger.kernel.org,
        Lorenzo Bianconi <lorenzo.bianconi@redhat.com>,
        Shayne Chen <shayne.chen@mediatek.com>,
        Evelyn Tsai <evelyn.tsai@mediatek.com>,
        linux-mediatek@lists.infradead.org, Bo Jiao <bo.jiao@mediatek.com>
Subject: Re: [PATCH v3 2/4] wifi: mt76: mt7915: enable full system reset
 support
Message-ID: <Y2+PBWfEw+WtZXzC@lore-desk>
References: <3e6ef9fb1d2e09d415b4c489cc9c62134a05b3c1.1668024217.git.ryder.lee@mediatek.com>
 <e8f7b70d0d119234917bd79c16c41f79c222e8f8.1668024217.git.ryder.lee@mediatek.com>
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> From: Bo Jiao <bo.jiao@mediatek.com>
>=20
> Add mt7915_reset() and refactor mt7915_mac_reset_work() to support
> full system recovery.
>=20
> Co-developed-by: Ryder Lee <ryder.lee@mediatek.com>
> Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
> Signed-off-by: Bo Jiao <bo.jiao@mediatek.com>
> ---
> change since v2 - change dev_info to make it easier to see that firmware =
crashed while looking at dmesg.
> ---
>  .../net/wireless/mediatek/mt76/mt7915/init.c  |  11 +-
>  .../net/wireless/mediatek/mt76/mt7915/mac.c   | 214 +++++++++++++++++-
>  .../net/wireless/mediatek/mt76/mt7915/main.c  |  18 +-
>  .../net/wireless/mediatek/mt76/mt7915/mcu.c   |  24 +-
>  .../net/wireless/mediatek/mt76/mt7915/mmio.c  |   7 +-
>  .../wireless/mediatek/mt76/mt7915/mt7915.h    |  15 +-
>  .../net/wireless/mediatek/mt76/mt7915/regs.h  |   4 +
>  7 files changed, 267 insertions(+), 26 deletions(-)
>=20
> diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/init.c b/drivers/n=
et/wireless/mediatek/mt76/mt7915/init.c
> index 324db5291c85..1f39aa3e3f3d 100644
> --- a/drivers/net/wireless/mediatek/mt76/mt7915/init.c
> +++ b/drivers/net/wireless/mediatek/mt76/mt7915/init.c
> @@ -262,9 +262,8 @@ static void mt7915_led_set_brightness(struct led_clas=
sdev *led_cdev,
>  		mt7915_led_set_config(led_cdev, 0xff, 0);
>  }
> =20
> -static void
> -mt7915_init_txpower(struct mt7915_dev *dev,
> -		    struct ieee80211_supported_band *sband)
> +void mt7915_init_txpower(struct mt7915_dev *dev,
> +			 struct ieee80211_supported_band *sband)
>  {
>  	int i, n_chains =3D hweight8(dev->mphy.antenna_mask);
>  	int nss_delta =3D mt76_tx_power_nss_delta(n_chains);
> @@ -446,7 +445,7 @@ mt7915_mac_init_band(struct mt7915_dev *dev, u8 band)
>  	mt76_clear(dev, MT_DMA_DCR0(band), MT_DMA_DCR0_RXD_G5_EN);
>  }
> =20
> -static void mt7915_mac_init(struct mt7915_dev *dev)
> +void mt7915_mac_init(struct mt7915_dev *dev)
>  {
>  	int i;
>  	u32 rx_len =3D is_mt7915(&dev->mt76) ? 0x400 : 0x680;
> @@ -476,7 +475,7 @@ static void mt7915_mac_init(struct mt7915_dev *dev)
>  	}
>  }
> =20
> -static int mt7915_txbf_init(struct mt7915_dev *dev)
> +int mt7915_txbf_init(struct mt7915_dev *dev)
>  {
>  	int ret;
> =20
> @@ -1117,6 +1116,8 @@ int mt7915_register_device(struct mt7915_dev *dev)
>  			goto unreg_thermal;
>  	}
> =20
> +	dev->recovery.hw_init_done =3D true;
> +
>  	mt7915_init_debugfs(&dev->phy);
> =20
>  	return 0;
> diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c b/drivers/ne=
t/wireless/mediatek/mt76/mt7915/mac.c
> index 3b1259f14de6..69ce3b39aa53 100644
> --- a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
> +++ b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
> @@ -1265,7 +1265,7 @@ mt7915_wait_reset_state(struct mt7915_dev *dev, u32=
 state)
>  	bool ret;
> =20
>  	ret =3D wait_event_timeout(dev->reset_wait,
> -				 (READ_ONCE(dev->reset_state) & state),
> +				 (READ_ONCE(dev->recovery.state) & state),
>  				 MT7915_RESET_TIMEOUT);
> =20
>  	WARN(!ret, "Timeout waiting for MCU reset state %x\n", state);
> @@ -1320,6 +1320,171 @@ void mt7915_tx_token_put(struct mt7915_dev *dev)
>  	idr_destroy(&dev->mt76.token);
>  }
> =20
> +static int
> +mt7915_mac_restart(struct mt7915_dev *dev)
> +{
> +	struct mt7915_phy *phy2;
> +	struct mt76_phy *ext_phy;
> +	struct mt76_dev *mdev =3D &dev->mt76;
> +	int i, ret;
> +	u32 irq_mask;
> +
> +	ext_phy =3D dev->mt76.phys[MT_BAND1];
> +	phy2 =3D ext_phy ? ext_phy->priv : NULL;
> +
> +	if (dev->hif2) {
> +		mt76_wr(dev, MT_INT1_MASK_CSR, 0x0);
> +		mt76_wr(dev, MT_INT1_SOURCE_CSR, ~0);
> +	}
> +
> +	if (dev_is_pci(mdev->dev)) {
> +		mt76_wr(dev, MT_PCIE_MAC_INT_ENABLE, 0x0);
> +		if (dev->hif2)
> +			mt76_wr(dev, MT_PCIE1_MAC_INT_ENABLE, 0x0);
> +	}
> +
> +	set_bit(MT76_RESET, &dev->mphy.state);
> +	set_bit(MT76_MCU_RESET, &dev->mphy.state);
> +	wake_up(&dev->mt76.mcu.wait);
> +	if (ext_phy) {
> +		set_bit(MT76_RESET, &ext_phy->state);
> +		set_bit(MT76_MCU_RESET, &ext_phy->state);
> +	}
> +
> +	/* lock/unlock all queues to ensure that no tx is pending */
> +	mt76_txq_schedule_all(&dev->mphy);
> +	if (ext_phy)
> +		mt76_txq_schedule_all(ext_phy);
> +
> +	/* disable all tx/rx napi */
> +	mt76_worker_disable(&dev->mt76.tx_worker);
> +	mt76_for_each_q_rx(mdev, i) {
> +		if (mdev->q_rx[i].ndesc)
> +			napi_disable(&dev->mt76.napi[i]);
> +	}
> +	napi_disable(&dev->mt76.tx_napi);
> +
> +	/* token reinit */
> +	mt7915_tx_token_put(dev);
> +	idr_init(&dev->mt76.token);
> +
> +	mt7915_dma_reset(dev, true);
> +
> +	local_bh_disable();
> +	mt76_for_each_q_rx(mdev, i) {
> +		if (mdev->q_rx[i].ndesc) {
> +			napi_enable(&dev->mt76.napi[i]);
> +			napi_schedule(&dev->mt76.napi[i]);
> +		}
> +	}
> +	local_bh_enable();
> +	clear_bit(MT76_MCU_RESET, &dev->mphy.state);
> +	clear_bit(MT76_STATE_MCU_RUNNING, &dev->mphy.state);
> +
> +	mt76_wr(dev, MT_INT_MASK_CSR, dev->mt76.mmio.irqmask);
> +	mt76_wr(dev, MT_INT_SOURCE_CSR, ~0);
> +
> +	if (dev->hif2) {
> +		mt76_wr(dev, MT_INT1_MASK_CSR, irq_mask);

irq_mask is used uninitialized here.
Moreover is mt7915_mac_restart() and full-reset compatible with wed support?
it seems in mt7915_dual_hif_set_irq_mask() we took a different approach.

Regards,
Lorenzo

> +		mt76_wr(dev, MT_INT1_SOURCE_CSR, ~0);
> +	}
> +	if (dev_is_pci(mdev->dev)) {
> +		mt76_wr(dev, MT_PCIE_MAC_INT_ENABLE, 0xff);
> +		if (dev->hif2)
> +			mt76_wr(dev, MT_PCIE1_MAC_INT_ENABLE, 0xff);
> +	}
> +
> +	/* load firmware */
> +	ret =3D mt7915_mcu_init_firmware(dev);
> +	if (ret)
> +		goto out;
> +
> +	/* set the necessary init items */
> +	ret =3D mt7915_mcu_set_eeprom(dev);
> +	if (ret)
> +		goto out;
> +
> +	mt7915_mac_init(dev);
> +	mt7915_init_txpower(dev, &dev->mphy.sband_2g.sband);
> +	mt7915_init_txpower(dev, &dev->mphy.sband_5g.sband);
> +	ret =3D mt7915_txbf_init(dev);
> +
> +	if (test_bit(MT76_STATE_RUNNING, &dev->mphy.state)) {
> +		ret =3D mt7915_run(dev->mphy.hw);
> +		if (ret)
> +			goto out;
> +	}
> +
> +	if (ext_phy && test_bit(MT76_STATE_RUNNING, &ext_phy->state)) {
> +		ret =3D mt7915_run(ext_phy->hw);
> +		if (ret)
> +			goto out;
> +	}
> +
> +out:
> +	/* reset done */
> +	clear_bit(MT76_RESET, &dev->mphy.state);
> +	if (phy2)
> +		clear_bit(MT76_RESET, &phy2->mt76->state);
> +
> +	local_bh_disable();
> +	napi_enable(&dev->mt76.tx_napi);
> +	napi_schedule(&dev->mt76.tx_napi);
> +	local_bh_enable();
> +
> +	mt76_worker_enable(&dev->mt76.tx_worker);
> +
> +	return ret;
> +}
> +
> +static void
> +mt7915_mac_full_reset(struct mt7915_dev *dev)
> +{
> +	struct mt7915_phy *phy2;
> +	struct mt76_phy *ext_phy;
> +	int i;
> +
> +	ext_phy =3D dev->mt76.phys[MT_BAND1];
> +	phy2 =3D ext_phy ? ext_phy->priv : NULL;
> +
> +	dev->recovery.hw_full_reset =3D true;
> +
> +	wake_up(&dev->mt76.mcu.wait);
> +	ieee80211_stop_queues(mt76_hw(dev));
> +	if (ext_phy)
> +		ieee80211_stop_queues(ext_phy->hw);
> +
> +	cancel_delayed_work_sync(&dev->mphy.mac_work);
> +	if (ext_phy)
> +		cancel_delayed_work_sync(&ext_phy->mac_work);
> +
> +	mutex_lock(&dev->mt76.mutex);
> +	for (i =3D 0; i < 10; i++) {
> +		if (!mt7915_mac_restart(dev))
> +			break;
> +	}
> +	mutex_unlock(&dev->mt76.mutex);
> +
> +	if (i =3D=3D 10)
> +		dev_err(dev->mt76.dev, "chip full reset failed\n");
> +
> +	ieee80211_restart_hw(mt76_hw(dev));
> +	if (ext_phy)
> +		ieee80211_restart_hw(ext_phy->hw);
> +
> +	ieee80211_wake_queues(mt76_hw(dev));
> +	if (ext_phy)
> +		ieee80211_wake_queues(ext_phy->hw);
> +
> +	dev->recovery.hw_full_reset =3D false;
> +	ieee80211_queue_delayed_work(mt76_hw(dev), &dev->mphy.mac_work,
> +				     MT7915_WATCHDOG_TIME);
> +	if (ext_phy)
> +		ieee80211_queue_delayed_work(ext_phy->hw,
> +					     &ext_phy->mac_work,
> +					     MT7915_WATCHDOG_TIME);
> +}
> +
>  /* system error recovery */
>  void mt7915_mac_reset_work(struct work_struct *work)
>  {
> @@ -1332,7 +1497,28 @@ void mt7915_mac_reset_work(struct work_struct *wor=
k)
>  	ext_phy =3D dev->mt76.phys[MT_BAND1];
>  	phy2 =3D ext_phy ? ext_phy->priv : NULL;
> =20
> -	if (!(READ_ONCE(dev->reset_state) & MT_MCU_CMD_STOP_DMA))
> +	/* chip full reset */
> +	if (dev->recovery.restart) {
> +		/* disable WA/WM WDT */
> +		mt76_clear(dev, MT_WFDMA0_MCU_HOST_INT_ENA,
> +			   MT_MCU_CMD_WDT_MASK);
> +
> +		mt7915_mac_full_reset(dev);
> +
> +		/* enable mcu irq */
> +		mt7915_irq_enable(dev, MT_INT_MCU_CMD);
> +		mt7915_irq_disable(dev, 0);
> +
> +		/* enable WA/WM WDT */
> +		mt76_set(dev, MT_WFDMA0_MCU_HOST_INT_ENA, MT_MCU_CMD_WDT_MASK);
> +
> +		dev->recovery.state =3D MT_MCU_CMD_NORMAL_STATE;
> +		dev->recovery.restart =3D false;
> +		return;
> +	}
> +
> +	/* chip partial reset */
> +	if (!(READ_ONCE(dev->recovery.state) & MT_MCU_CMD_STOP_DMA))
>  		return;
> =20
>  	ieee80211_stop_queues(mt76_hw(dev));
> @@ -1406,6 +1592,30 @@ void mt7915_mac_reset_work(struct work_struct *wor=
k)
>  					     MT7915_WATCHDOG_TIME);
>  }
> =20
> +void mt7915_reset(struct mt7915_dev *dev)
> +{
> +	if (!dev->recovery.hw_init_done)
> +		return;
> +
> +	if (dev->recovery.hw_full_reset)
> +		return;
> +
> +	/* wm/wa exception: do full recovery */
> +	if (READ_ONCE(dev->recovery.state) & MT_MCU_CMD_WDT_MASK) {
> +		dev->recovery.restart =3D true;
> +		dev_info(dev->mt76.dev,
> +			 "%s indicated firmware crash, attempting recovery\n",
> +			 wiphy_name(dev->mt76.hw->wiphy));
> +
> +		mt7915_irq_disable(dev, MT_INT_MCU_CMD);
> +		queue_work(dev->mt76.wq, &dev->reset_work);
> +		return;
> +	}
> +
> +	queue_work(dev->mt76.wq, &dev->reset_work);
> +	wake_up(&dev->reset_wait);
> +}
> +
>  void mt7915_mac_update_stats(struct mt7915_phy *phy)
>  {
>  	struct mt7915_dev *dev =3D phy->dev;
> diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/main.c b/drivers/n=
et/wireless/mediatek/mt76/mt7915/main.c
> index 6de49b93387e..32c362965dc4 100644
> --- a/drivers/net/wireless/mediatek/mt76/mt7915/main.c
> +++ b/drivers/net/wireless/mediatek/mt76/mt7915/main.c
> @@ -20,17 +20,13 @@ static bool mt7915_dev_running(struct mt7915_dev *dev)
>  	return phy && test_bit(MT76_STATE_RUNNING, &phy->mt76->state);
>  }
> =20
> -static int mt7915_start(struct ieee80211_hw *hw)
> +int mt7915_run(struct ieee80211_hw *hw)
>  {
>  	struct mt7915_dev *dev =3D mt7915_hw_dev(hw);
>  	struct mt7915_phy *phy =3D mt7915_hw_phy(hw);
>  	bool running;
>  	int ret;
> =20
> -	flush_work(&dev->init_work);
> -
> -	mutex_lock(&dev->mt76.mutex);
> -
>  	running =3D mt7915_dev_running(dev);
> =20
>  	if (!running) {
> @@ -80,6 +76,18 @@ static int mt7915_start(struct ieee80211_hw *hw)
>  		mt7915_mac_reset_counters(phy);
> =20
>  out:
> +	return ret;
> +}
> +
> +static int mt7915_start(struct ieee80211_hw *hw)
> +{
> +	struct mt7915_dev *dev =3D mt7915_hw_dev(hw);
> +	int ret;
> +
> +	flush_work(&dev->init_work);
> +
> +	mutex_lock(&dev->mt76.mutex);
> +	ret =3D mt7915_run(hw);
>  	mutex_unlock(&dev->mt76.mutex);
> =20
>  	return ret;
> diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c b/drivers/ne=
t/wireless/mediatek/mt76/mt7915/mcu.c
> index 65ae959859e7..17fe29d8fd71 100644
> --- a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
> +++ b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
> @@ -2249,18 +2249,10 @@ mt7915_mcu_init_rx_airtime(struct mt7915_dev *dev)
>  				 sizeof(req), true);
>  }
> =20
> -int mt7915_mcu_init(struct mt7915_dev *dev)
> +int mt7915_mcu_init_firmware(struct mt7915_dev *dev)
>  {
> -	static const struct mt76_mcu_ops mt7915_mcu_ops =3D {
> -		.headroom =3D sizeof(struct mt76_connac2_mcu_txd),
> -		.mcu_skb_send_msg =3D mt7915_mcu_send_message,
> -		.mcu_parse_response =3D mt7915_mcu_parse_response,
> -		.mcu_restart =3D mt76_connac_mcu_restart,
> -	};
>  	int ret;
> =20
> -	dev->mt76.mcu_ops =3D &mt7915_mcu_ops;
> -
>  	/* force firmware operation mode into normal state,
>  	 * which should be set before firmware download stage.
>  	 */
> @@ -2309,6 +2301,20 @@ int mt7915_mcu_init(struct mt7915_dev *dev)
>  				 MCU_WA_PARAM_RED, 0, 0);
>  }
> =20
> +int mt7915_mcu_init(struct mt7915_dev *dev)
> +{
> +	static const struct mt76_mcu_ops mt7915_mcu_ops =3D {
> +		.headroom =3D sizeof(struct mt76_connac2_mcu_txd),
> +		.mcu_skb_send_msg =3D mt7915_mcu_send_message,
> +		.mcu_parse_response =3D mt7915_mcu_parse_response,
> +		.mcu_restart =3D mt76_connac_mcu_restart,
> +	};
> +
> +	dev->mt76.mcu_ops =3D &mt7915_mcu_ops;
> +
> +	return mt7915_mcu_init_firmware(dev);
> +}
> +
>  void mt7915_mcu_exit(struct mt7915_dev *dev)
>  {
>  	__mt76_mcu_restart(&dev->mt76);
> diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mmio.c b/drivers/n=
et/wireless/mediatek/mt76/mt7915/mmio.c
> index be1b8ea711c7..032af46289af 100644
> --- a/drivers/net/wireless/mediatek/mt76/mt7915/mmio.c
> +++ b/drivers/net/wireless/mediatek/mt76/mt7915/mmio.c
> @@ -746,10 +746,9 @@ static void mt7915_irq_tasklet(struct tasklet_struct=
 *t)
>  		u32 val =3D mt76_rr(dev, MT_MCU_CMD);
> =20
>  		mt76_wr(dev, MT_MCU_CMD, val);
> -		if (val & MT_MCU_CMD_ERROR_MASK) {
> -			dev->reset_state =3D val;
> -			queue_work(dev->mt76.wq, &dev->reset_work);
> -			wake_up(&dev->reset_wait);
> +		if (val & (MT_MCU_CMD_ERROR_MASK | MT_MCU_CMD_WDT_MASK)) {
> +			dev->recovery.state =3D val;
> +			mt7915_reset(dev);
>  		}
>  	}
>  }
> diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mt7915.h b/drivers=
/net/wireless/mediatek/mt76/mt7915/mt7915.h
> index 5af26e60e902..49caf7b21a20 100644
> --- a/drivers/net/wireless/mediatek/mt76/mt7915/mt7915.h
> +++ b/drivers/net/wireless/mediatek/mt76/mt7915/mt7915.h
> @@ -303,7 +303,13 @@ struct mt7915_dev {
>  	struct work_struct rc_work;
>  	struct work_struct reset_work;
>  	wait_queue_head_t reset_wait;
> -	u32 reset_state;
> +
> +	struct {
> +		u32 state;
> +		bool hw_full_reset:1;
> +		bool hw_init_done:1;
> +		bool restart:1;
> +	} recovery;
> =20
>  	struct list_head sta_rc_list;
>  	struct list_head sta_poll_list;
> @@ -444,7 +450,13 @@ int mt7915_dma_init(struct mt7915_dev *dev, struct m=
t7915_phy *phy2);
>  void mt7915_dma_prefetch(struct mt7915_dev *dev);
>  void mt7915_dma_cleanup(struct mt7915_dev *dev);
>  int mt7915_dma_reset(struct mt7915_dev *dev, bool force);
> +int mt7915_txbf_init(struct mt7915_dev *dev);
> +void mt7915_init_txpower(struct mt7915_dev *dev,
> +			 struct ieee80211_supported_band *sband);
> +void mt7915_reset(struct mt7915_dev *dev);
> +int mt7915_run(struct ieee80211_hw *hw);
>  int mt7915_mcu_init(struct mt7915_dev *dev);
> +int mt7915_mcu_init_firmware(struct mt7915_dev *dev);
>  int mt7915_mcu_twt_agrt_update(struct mt7915_dev *dev,
>  			       struct mt7915_vif *mvif,
>  			       struct mt7915_twt_flow *flow,
> @@ -544,6 +556,7 @@ static inline void mt7915_irq_disable(struct mt7915_d=
ev *dev, u32 mask)
>  		mt76_set_irq_mask(&dev->mt76, MT_INT_MASK_CSR, mask, 0);
>  }
> =20
> +void mt7915_mac_init(struct mt7915_dev *dev);
>  u32 mt7915_mac_wtbl_lmac_addr(struct mt7915_dev *dev, u16 wcid, u8 dw);
>  bool mt7915_mac_wtbl_update(struct mt7915_dev *dev, int idx, u32 mask);
>  void mt7915_mac_reset_counters(struct mt7915_phy *phy);
> diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/regs.h b/drivers/n=
et/wireless/mediatek/mt76/mt7915/regs.h
> index 5180dd931835..9120380d74c6 100644
> --- a/drivers/net/wireless/mediatek/mt76/mt7915/regs.h
> +++ b/drivers/net/wireless/mediatek/mt76/mt7915/regs.h
> @@ -541,6 +541,8 @@ enum offs_rev {
>  #define MT_WFDMA0_BUSY_ENA_TX_FIFO1	BIT(1)
>  #define MT_WFDMA0_BUSY_ENA_RX_FIFO	BIT(2)
> =20
> +#define MT_WFDMA0_MCU_HOST_INT_ENA	MT_WFDMA0(0x1f4)
> +
>  #define MT_WFDMA0_GLO_CFG		MT_WFDMA0(0x208)
>  #define MT_WFDMA0_GLO_CFG_TX_DMA_EN	BIT(0)
>  #define MT_WFDMA0_GLO_CFG_RX_DMA_EN	BIT(2)
> @@ -709,6 +711,8 @@ enum offs_rev {
>  #define MT_MCU_CMD_NORMAL_STATE		BIT(5)
>  #define MT_MCU_CMD_ERROR_MASK		GENMASK(5, 1)
> =20
> +#define MT_MCU_CMD_WDT_MASK		GENMASK(31, 30)
> +
>  /* TOP RGU */
>  #define MT_TOP_RGU_BASE			0x18000000
>  #define MT_TOP_PWR_CTRL			(MT_TOP_RGU_BASE + (0x0))
> --=20
> 2.36.1
>=20

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