linux-kernel - Re: [PATCH 2/5] brcmfmac: Use common CORDIC

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Message-ID: <21e6a75b-7728-761d-d899-395864226fb5@broadcom.com>
Date:   Mon, 5 Nov 2018 10:13:47 +0100
From:   Arend van Spriel <arend.vanspriel@...adcom.com>
To:     Kalle Valo <kvalo@...eaurora.org>, Priit Laes <plaes@...es.org>
Cc:     linux-kernel@...r.kernel.org, Franky Lin <franky.lin@...adcom.com>,
        Hante Meuleman <hante.meuleman@...adcom.com>,
        Chi-Hsien Lin <chi-hsien.lin@...ress.com>,
        Wright Feng <wright.feng@...ress.com>,
        "David S. Miller" <davem@...emloft.net>,
        linux-wireless@...r.kernel.org,
        brcm80211-dev-list.pdl@...adcom.com,
        brcm80211-dev-list@...ress.com, netdev@...r.kernel.org
Subject: Re: [PATCH 2/5] brcmfmac: Use common CORDIC_FLOAT macro from lib

On 11/5/2018 10:05 AM, Kalle Valo wrote:
> Priit Laes <plaes@...es.org> writes:
>
>> Now that cordic library has the CORDIC_FLOAT macro, use that
>>
>> Signed-off-by: Priit Laes <plaes@...es.org>
>> ---
>>  drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_lcn.c | 4 ++--
>>  drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_n.c   | 4 ++--
>
> The driver is "brcmsmac" (note the 's', not 'f'), you should fix the
> title accordingly.
>
>> --- a/drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_lcn.c
>> +++ b/drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_lcn.c
>> @@ -3447,8 +3447,8 @@ wlc_lcnphy_start_tx_tone(struct brcms_phy *pi, s32 f_kHz, u16 max_val,
>>
>>  		theta += rot;
>>
>> -		i_samp = (u16) (FLOAT(tone_samp.i * max_val) & 0x3ff);
>> -		q_samp = (u16) (FLOAT(tone_samp.q * max_val) & 0x3ff);
>> +		i_samp = (u16)(CORDIC_FLOAT(tone_samp.i * max_val) & 0x3ff);
>> +		q_samp = (u16)(CORDIC_FLOAT(tone_samp.q * max_val) & 0x3ff);
>
> I haven't seen the patch 1 yet, but just from seeing this patch I don't
> get what's the benefit.

The FLOAT macro was defined in brcmsmac (see patch 3). It is now moved 
to the cordic library simply because it is more closely related to that.

Regards,
Arend