[PATCH] mt76: mt7915: update station's airtime and gi from event

[Ryder Lee]

On Thu, 2021-11-25 at 17:13 +0800, MeiChia Chiu wrote:
> From: MeiChia Chiu <meichia.chiu at mediatek.com>

Should be [RFC].

> To avoid race condition in firmware,
> if firmware support airtime and gi event,
> driver update station's airtime and gi from event.
> 
> Reviewed-by: Evelyn Tsai <evelyn.tsai at mediatek.com>
> Reviewed-by: Ryder Lee <ryder.lee at mediatek.com>
> Co-developed-by: Sujuan Chen <sujuan.chen at mediatek.com>
> Signed-off-by: Sujuan Chen <sujuan.chen at mediatek.com>
> Signed-off-by: MeiChia Chiu <meichia.chiu at mediatek.com>
> 
> ---
>  .../net/wireless/mediatek/mt76/mt7915/init.c   |   2 +
>  .../net/wireless/mediatek/mt76/mt7915/mac.c    |  35 ++++++++----
>  .../net/wireless/mediatek/mt76/mt7915/mcu.c    | 138
> ++++++++++++++++++++++++++++++++++++++++++++++++
>  .../net/wireless/mediatek/mt76/mt7915/mcu.h    |  28 ++++++++++
>  .../net/wireless/mediatek/mt76/mt7915/mt7915.h |  11 ++++
>  5 files changed, 204 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/init.c
> b/drivers/net/wireless/mediatek/mt76/mt7915/init.c
> index 4b56358d..a5f6d25d 100644
> --- a/drivers/net/wireless/mediatek/mt76/mt7915/init.c
> +++ b/drivers/net/wireless/mediatek/mt76/mt7915/init.c
> @@ -960,6 +960,8 @@ int mt7915_register_device(struct mt7915_dev
> *dev)
>  	if (ret)
>  		return ret;
>  
> +	dev->fw_ver = mt76_rr(dev, MT_SWDEF(0x7c));
> +
>  	return mt7915_init_debugfs(&dev->phy);
>  }
>  
> diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
> b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
> index 1041d88f..b2e20251 100644
> --- a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
> +++ b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
> @@ -1433,7 +1433,8 @@ mt7915_mac_tx_free(struct mt7915_dev *dev,
> struct sk_buff *skb)
>  		mt7915_txwi_free(dev, txwi, sta, &free_list);
>  	}
>  
> -	mt7915_mac_sta_poll(dev);
> +	if (!mt7915_firmware_offload(dev))
> +		mt7915_mac_sta_poll(dev);

@ Sujuan, can you double check if MCU_EXT_EVENT_TXRX_AIR_TIME works for
all firmware versions? Maybe we can use this single event directly if
everyone agrees with this change. 

I'd suggest adding some persuasive testing datas into the commit
message to help reviewers make adjudgement.

Ryder