RE: [PATCH rtw-next 5/5] wifi: rtlwifi: rtl8192d: let the firmware use all rates

[Ping-Ke Shih <pkshih@realtek.com>]

Ho Jie Feng <hjf3108@gmail.com> wrote:
> The rate mask is chosen based on rssi_level, however rssi_level
> is always 0, 

Should we fix it ?

> since:
> - for rtl8192de, call to rtl92d_dm_refresh_rate_adaptive_mask is
>   commented out and function is not implemented
> - for rtl8192du, it is also not called.
> 
> This makes the branch always choose less than optimal allowed MCS rates.
> Enable all the rates.
> 
> Test results (2.4 GHz):
>    before after
> TX 6.4    12.6

How about the rate before/after? I think the highest rate will be similar
or the same?

> RX 32.0   39.1

You change many rate masks for different wireless modes, so please provide
more experiments. Especially you need tests for a clean & noisy environments. 

> 
> Signed-off-by: Ho Jie Feng <hjf3108@gmail.com>
> ---
>  .../wireless/realtek/rtlwifi/rtl8192d/hw_common.c    | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8192d/hw_common.c
> b/drivers/net/wireless/realtek/rtlwifi/rtl8192d/hw_common.c
> index cfefbe86380fbc..0c921c049b5178 100644
> --- a/drivers/net/wireless/realtek/rtlwifi/rtl8192d/hw_common.c
> +++ b/drivers/net/wireless/realtek/rtlwifi/rtl8192d/hw_common.c
> @@ -903,7 +903,7 @@ static void rtl92d_update_hal_rate_mask(struct ieee80211_hw *hw,
>                 else if (rssi_level == 2)
>                         ratr_bitmap &= 0x00000ff0;
>                 else
> -                       ratr_bitmap &= 0x00000ff5;
> +                       ratr_bitmap &= 0x00000fff;

This mask means all 12 OFDM rates. I guess original design wants to select
higher rate quickly.

>                 break;
>         case WIRELESS_MODE_A:
>                 ratr_index = RATR_INX_WIRELESS_G;
> @@ -922,7 +922,7 @@ static void rtl92d_update_hal_rate_mask(struct ieee80211_hw *hw,
>                         else if (rssi_level == 2)
>                                 ratr_bitmap &= 0x0007f000;
>                         else
> -                               ratr_bitmap &= 0x0007f005;
> +                               ratr_bitmap &= 0x000fffff;

For N mode, it wants to jump to MCS rate quickly I guess.

>                 } else {
>                         if (rtlphy->rf_type == RF_1T2R ||
>                             rtlphy->rf_type == RF_1T1R) {

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