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From:   Kalle Valo <kvalo@codeaurora.org>
To:     Jouni Malinen <jouni@codeaurora.org>
Cc:     ath11k@lists.infradead.org, linux-wireless@vger.kernel.org,
        Wen Gong <wgong@codeaurora.org>
Subject: Re: [PATCH 3/3] ath11k: set correct NL80211_FEATURE_DYNAMIC_SMPS for WCN6855
References: <20210914163726.38604-1-jouni@codeaurora.org>
        <20210914163726.38604-3-jouni@codeaurora.org>
Date:   Thu, 28 Oct 2021 13:07:11 +0300
In-Reply-To: <20210914163726.38604-3-jouni@codeaurora.org> (Jouni Malinen's
        message of "Tue, 14 Sep 2021 19:37:26 +0300")
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Jouni Malinen <jouni@codeaurora.org> writes:

> From: Wen Gong <wgong@codeaurora.org>
>
> Commit "ath11k: support SMPS configuration for 6 GHz" changed "if
> (ht_cap & WMI_HT_CAP_DYNAMIC_SMPS)" to "if (ht_cap &
> WMI_HT_CAP_DYNAMIC_SMPS || ar->supports_6ghz)" which means
> NL80211_FEATURE_DYNAMIC_SMPS is enabled for all chips which support 6
> GHz. However, WCN6855 supports 6 GHz but it does not support feature
> NL80211_FEATURE_DYNAMIC_SMPS, and this can lead to MU-MIMO test failures
> for WCN6855.
>
> Disable NL80211_FEATURE_DYNAMIC_SMPS for WCN6855 since its ht_cap does
> not support WMI_HT_CAP_DYNAMIC_SMPS.
>
> Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-01720.1-QCAHSPSWPL_V1_V2_SILICONZ_LITE-1
>
> Signed-off-by: Wen Gong <wgong@codeaurora.org>
> Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
> ---
>  drivers/net/wireless/ath/ath11k/core.c | 1 +
>  drivers/net/wireless/ath/ath11k/hw.h   | 1 +
>  drivers/net/wireless/ath/ath11k/mac.c  | 3 ++-
>  3 files changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/wireless/ath/ath11k/core.c b/drivers/net/wireless/ath/ath11k/core.c
> index 265ff225bd81..2bae8c5184d4 100644
> --- a/drivers/net/wireless/ath/ath11k/core.c
> +++ b/drivers/net/wireless/ath/ath11k/core.c
> @@ -279,6 +279,7 @@ static const struct ath11k_hw_params ath11k_hw_params[] = {
>  		.sram_dump = &sram_dump_wcn6855,
>  		.max_tx_ring = DP_TCL_NUM_RING_MAX_QCA6390,
>  		.hal_params = &ath11k_hal_params_qca6390,
> +		.check_dynamic_smps = true,
>  	},
>  };
>  
> diff --git a/drivers/net/wireless/ath/ath11k/hw.h b/drivers/net/wireless/ath/ath11k/hw.h
> index c6831fb110ba..7463b96770b7 100644
> --- a/drivers/net/wireless/ath/ath11k/hw.h
> +++ b/drivers/net/wireless/ath/ath11k/hw.h
> @@ -180,6 +180,7 @@ struct ath11k_hw_params {
>  	const struct ath11k_hw_sram_dump *sram_dump;
>  	u8 max_tx_ring;
>  	const struct hal_param *hal_params;
> +	bool check_dynamic_smps;
>  };
>  
>  struct ath11k_hw_ops {
> diff --git a/drivers/net/wireless/ath/ath11k/mac.c b/drivers/net/wireless/ath/ath11k/mac.c
> index 1f4765e43546..97a2c92b7b9b 100644
> --- a/drivers/net/wireless/ath/ath11k/mac.c
> +++ b/drivers/net/wireless/ath/ath11k/mac.c
> @@ -7570,7 +7570,8 @@ static int __ath11k_mac_register(struct ath11k *ar)
>  	 * for each band for a dual band capable radio. It will be tricky to
>  	 * handle it when the ht capability different for each band.
>  	 */
> -	if (ht_cap & WMI_HT_CAP_DYNAMIC_SMPS || ar->supports_6ghz)
> +	if (ht_cap & WMI_HT_CAP_DYNAMIC_SMPS ||
> +	    (ar->supports_6ghz && !ab->hw_params.check_dynamic_smps))
>  		ar->hw->wiphy->features |= NL80211_FEATURE_DYNAMIC_SMPS;

Instead of a "negative" flag I reverted the test and renamed the flag to
supports_dynamic_smps_6ghz. AFAIK QCN9074 is the only device supporting
6 GHz band so I enabled the flag only for it.

Please review my changes in the pending branch:

https://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git/commit/?h=pending&id=cc692cfb9f2981691b39b601b37e4544ecf01136

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