linux-kernel - Re: [PATCH v2] rtl8xxxu: add bluetooth co-existence support for single antenna

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Date:   Thu, 3 Oct 2019 09:19:15 +0800
From:   Chris Chiu <chiu@...lessm.com>
To:     Jes Sorensen <jes.sorensen@...il.com>
Cc:     Kalle Valo <kvalo@...eaurora.org>,
        David Miller <davem@...emloft.net>,
        linux-wireless <linux-wireless@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        Linux Upstreaming Team <linux@...lessm.com>
Subject: Re: [PATCH v2] rtl8xxxu: add bluetooth co-existence support for
 single antenna

On Wed, Oct 2, 2019 at 11:04 PM Jes Sorensen <jes.sorensen@...il.com> wrote:
>
>
> In general I think it looks good! One nit below:
>
> Sorry I have been traveling for the last three weeks, so just catching up.
>
>
> > +void rtl8723bu_set_coex_with_type(struct rtl8xxxu_priv *priv, u8 type)
> > +{
> > +     switch (type) {
> > +     case 0:
> > +             rtl8xxxu_write32(priv, REG_BT_COEX_TABLE1, 0x55555555);
> > +             rtl8xxxu_write32(priv, REG_BT_COEX_TABLE2, 0x55555555);
> > +             rtl8xxxu_write32(priv, REG_BT_COEX_TABLE3, 0x00ffffff);
> > +             rtl8xxxu_write8(priv, REG_BT_COEX_TABLE4, 0x03);
> > +             break;
> > +     case 1:
> > +     case 3:
>
> The one item here, I would prefer introducing some defined types to
> avoid the hard coded type numbers. It's much easier to read and debug
> when named.
>
Honestly, I also thought of that but there's no meaningful description for these
numbers in the vendor driver. Even based on where they're invoked, I can merely
give a rough definition on 0. So I left it as it is for the covenience
if I have to do
cross-comparison with vendor driver in the future for some possible
unknown bugs.

> If you shortened the name of the function to rtl8723bu_set_coex() you
> won't have problems with line lengths at the calling point.
>
I think the rtl8723bu_set_ps_tdma() function would cause the line length problem
more than rtl8723bu_set_coex_with_type() at the calling point. But as the same
debug reason as mentioned, I may like to keep it because I don't know how to
categorize the 5 magic parameters. I also reference the latest rtw88
driver code,
it seems no better solution so far. I'll keep watching if there's any
better idea.

Chris