[PATCH mt76 3/6] wifi: mt76: mt7996: update WFSYS reset flow for MT7990 chipsets

[Lorenzo Bianconi]

> From: Peter Chiu <chui-hao.chiu at mediatek.com>
> 
> Skip WFSYS reset during bootup for MT7990 chipsets; only reset if L0.5
> recovery is triggered.
> Without this fix, the following kernel error may occur:
> Internal error: synchronous external abort.

I guess we are missing a Fixes tag here.

Regards,
Lorenzo

> 
> Signed-off-by: Peter Chiu <chui-hao.chiu at mediatek.com>
> Signed-off-by: Shayne Chen <shayne.chen at mediatek.com>
> ---
>  .../net/wireless/mediatek/mt76/mt7996/init.c  | 29 +++++++++++++++++--
>  .../net/wireless/mediatek/mt76/mt7996/regs.h  |  8 +++++
>  2 files changed, 34 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/wireless/mediatek/mt76/mt7996/init.c b/drivers/net/wireless/mediatek/mt76/mt7996/init.c
> index f3239f530aea..8dfb81eabc9a 100644
> --- a/drivers/net/wireless/mediatek/mt76/mt7996/init.c
> +++ b/drivers/net/wireless/mediatek/mt76/mt7996/init.c
> @@ -791,11 +791,34 @@ static void mt7996_init_work(struct work_struct *work)
>  
>  void mt7996_wfsys_reset(struct mt7996_dev *dev)
>  {
> -	mt76_set(dev, MT_WF_SUBSYS_RST, 0x1);
> -	msleep(20);
> +	if (!is_mt7990(&dev->mt76)) {
> +		mt76_set(dev, MT_WF_SUBSYS_RST, 0x1);
> +		msleep(20);
> +
> +		mt76_clear(dev, MT_WF_SUBSYS_RST, 0x1);
> +		msleep(20);
> +
> +		return;
> +	}
>  
> -	mt76_clear(dev, MT_WF_SUBSYS_RST, 0x1);
> +	if (!dev->recovery.hw_full_reset)
> +		return;
> +
> +	mt76_set(dev, MT_WF_SUBSYS_RST,
> +		 MT_WF_SUBSYS_RST_WHOLE_PATH_RST_REVERT |
> +		 MT_WF_SUBSYS_RST_BYPASS_WFDMA_SLP_PROT |
> +		 MT_WF_SUBSYS_RST_BYPASS_WFDMA2_SLP_PROT);
> +	mt76_rmw(dev, MT_WF_SUBSYS_RST,
> +		 MT_WF_SUBSYS_RST_WHOLE_PATH_RST_REVERT_CYCLE,
> +		 u32_encode_bits(0x20, MT_WF_SUBSYS_RST_WHOLE_PATH_RST_REVERT_CYCLE));
> +	mt76_clear(dev, MT_WF_L05_RST, MT_WF_L05_RST_WF_RST_MASK);
> +	mt76_set(dev, MT_WF_SUBSYS_RST, MT_WF_SUBSYS_RST_WHOLE_PATH_RST);
>  	msleep(20);
> +
> +	if (mt76_poll(dev, MT_WF_L05_RST, MT_WF_L05_RST_WF_RST_MASK, 0x1a, 1000))
> +		return;
> +
> +	dev_err(dev->mt76.dev, "wfsys reset fail\n");
>  }
>  
>  static void mt7996_rro_hw_init_v3(struct mt7996_dev *dev)
> diff --git a/drivers/net/wireless/mediatek/mt76/mt7996/regs.h b/drivers/net/wireless/mediatek/mt76/mt7996/regs.h
> index 393faae2d52b..c6379933b6c3 100644
> --- a/drivers/net/wireless/mediatek/mt76/mt7996/regs.h
> +++ b/drivers/net/wireless/mediatek/mt76/mt7996/regs.h
> @@ -736,7 +736,15 @@ enum offs_rev {
>  #define MT_HW_REV				0x70010204
>  #define MT_HW_REV1				0x8a00
>  
> +#define MT_WF_L05_RST				0x70028550
> +#define MT_WF_L05_RST_WF_RST_MASK		GENMASK(4, 0)
> +
>  #define MT_WF_SUBSYS_RST			0x70028600
> +#define MT_WF_SUBSYS_RST_WHOLE_PATH_RST		BIT(0)
> +#define MT_WF_SUBSYS_RST_WHOLE_PATH_RST_REVERT	BIT(5)
> +#define MT_WF_SUBSYS_RST_BYPASS_WFDMA_SLP_PROT	BIT(6)
> +#define MT_WF_SUBSYS_RST_BYPASS_WFDMA2_SLP_PROT	BIT(16)
> +#define MT_WF_SUBSYS_RST_WHOLE_PATH_RST_REVERT_CYCLE	GENMASK(15, 8)
>  
>  /* PCIE MAC */
>  #define MT_PCIE_MAC_BASE			0x74030000
> -- 
> 2.51.0
> 
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