[PATCH 4/6] mt76: mt7921: introduce mt7921_wpdma_reinit_cond utility routine

[Lorenzo Bianconi]

> From: Sean Wang <sean.wang at mediatek.com>

I guess here we should use my 'From' tag

Regards,
Lorenzo

> 
> Add mt7921_wpdma_reinit_cond to check dummy reg if driver needs to
> reinitialized WPDMA after driver_own operation
> 
> Co-developed-by: Leon Yen <leon.yen at mediatek.com>
> Signed-off-by: Leon Yen <leon.yen at mediatek.com>
> Signed-off-by: Lorenzo Bianconi <lorenzo at kernel.org>
> Signed-off-by: Sean Wang <sean.wang at mediatek.com>
> ---
>  .../net/wireless/mediatek/mt76/mt76_connac.h  |  4 +++
>  .../wireless/mediatek/mt76/mt7921/debugfs.c   | 13 ++++++++++
>  .../net/wireless/mediatek/mt76/mt7921/dma.c   | 25 +++++++++++++++++++
>  .../wireless/mediatek/mt76/mt7921/mt7921.h    |  6 +++++
>  4 files changed, 48 insertions(+)
> 
> diff --git a/drivers/net/wireless/mediatek/mt76/mt76_connac.h b/drivers/net/wireless/mediatek/mt76/mt76_connac.h
> index b811f3c410a1..3b5bff80a462 100644
> --- a/drivers/net/wireless/mediatek/mt76/mt76_connac.h
> +++ b/drivers/net/wireless/mediatek/mt76/mt76_connac.h
> @@ -58,6 +58,10 @@ struct mt76_connac_pm {
>  	struct delayed_work ps_work;
>  	unsigned long last_activity;
>  	unsigned long idle_timeout;
> +
> +	struct {
> +		unsigned int lp_wake;
> +	} stats;
>  };
>  
>  struct mt76_connac_coredump {
> diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c b/drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c
> index 5a54cd8d2ce4..bd2aca654767 100644
> --- a/drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c
> +++ b/drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c
> @@ -256,6 +256,17 @@ mt7921_pm_get(void *data, u64 *val)
>  
>  DEFINE_DEBUGFS_ATTRIBUTE(fops_pm, mt7921_pm_get, mt7921_pm_set, "%lld\n");
>  
> +static int
> +mt7921_pm_stats(struct seq_file *s, void *data)
> +{
> +	struct mt7921_dev *dev = dev_get_drvdata(s->private);
> +	struct mt76_connac_pm *pm = &dev->pm;
> +
> +	seq_printf(s, "low power wakes: %9d\n", pm->stats.lp_wake);
> +
> +	return 0;
> +}
> +
>  static int
>  mt7921_pm_idle_timeout_set(void *data, u64 val)
>  {
> @@ -322,6 +333,8 @@ int mt7921_init_debugfs(struct mt7921_dev *dev)
>  	debugfs_create_file("idle-timeout", 0600, dir, dev,
>  			    &fops_pm_idle_timeout);
>  	debugfs_create_file("chip_reset", 0600, dir, dev, &fops_reset);
> +	debugfs_create_devm_seqfile(dev->mt76.dev, "runtime_pm_stats", dir,
> +				    mt7921_pm_stats);
>  
>  	return 0;
>  }
> diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/dma.c b/drivers/net/wireless/mediatek/mt76/mt7921/dma.c
> index 8c556ff3ae93..72f5704f8f11 100644
> --- a/drivers/net/wireless/mediatek/mt76/mt7921/dma.c
> +++ b/drivers/net/wireless/mediatek/mt76/mt7921/dma.c
> @@ -329,6 +329,31 @@ int mt7921_wpdma_reset(struct mt7921_dev *dev, bool force)
>  	return 0;
>  }
>  
> +int mt7921_wpdma_reinit_cond(struct mt7921_dev *dev)
> +{
> +	struct mt76_connac_pm *pm = &dev->pm;
> +	int err;
> +
> +	/* check if the wpdma must be reinitialized */
> +	if (mt7921_dma_need_reinit(dev)) {
> +		/* disable interrutpts */
> +		mt76_wr(dev, MT_WFDMA0_HOST_INT_ENA, 0);
> +		mt76_wr(dev, MT_PCIE_MAC_INT_ENABLE, 0x0);
> +
> +		err = mt7921_wpdma_reset(dev, false);
> +		if (err) {
> +			dev_err(dev->mt76.dev, "wpdma reset failed\n");
> +			return err;
> +		}
> +
> +		/* enable interrutpts */
> +		mt76_wr(dev, MT_PCIE_MAC_INT_ENABLE, 0xff);
> +		pm->stats.lp_wake++;
> +	}
> +
> +	return 0;
> +}
> +
>  int mt7921_dma_init(struct mt7921_dev *dev)
>  {
>  	/* Increase buffer size to receive large VHT/HE MPDUs */
> diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h b/drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h
> index 06a85d2d1c6f..bb4961d3969a 100644
> --- a/drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h
> +++ b/drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h
> @@ -254,6 +254,7 @@ int mt7921_eeprom_get_target_power(struct mt7921_dev *dev,
>  void mt7921_eeprom_init_sku(struct mt7921_dev *dev);
>  int mt7921_dma_init(struct mt7921_dev *dev);
>  int mt7921_wpdma_reset(struct mt7921_dev *dev, bool force);
> +int mt7921_wpdma_reinit_cond(struct mt7921_dev *dev);
>  void mt7921_dma_cleanup(struct mt7921_dev *dev);
>  int mt7921_run_firmware(struct mt7921_dev *dev);
>  int mt7921_mcu_init(struct mt7921_dev *dev);
> @@ -317,6 +318,11 @@ mt7921_l1_rmw(struct mt7921_dev *dev, u32 addr, u32 mask, u32 val)
>  #define mt7921_l1_set(dev, addr, val)	mt7921_l1_rmw(dev, addr, 0, val)
>  #define mt7921_l1_clear(dev, addr, val)	mt7921_l1_rmw(dev, addr, val, 0)
>  
> +static inline bool mt7921_dma_need_reinit(struct mt7921_dev *dev)
> +{
> +	return !mt76_get_field(dev, MT_WFDMA_DUMMY_CR, MT_WFDMA_NEED_REINIT);
> +}
> +
>  void mt7921_mac_init(struct mt7921_dev *dev);
>  bool mt7921_mac_wtbl_update(struct mt7921_dev *dev, int idx, u32 mask);
>  void mt7921_mac_reset_counters(struct mt7921_phy *phy);
> -- 
> 2.25.1
> 
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