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

[Jes Sorensen]

On 10/2/19 9:19 PM, Chris Chiu wrote:
> On Wed, Oct 2, 2019 at 11:04 PM Jes Sorensen <jes.sorensen@xxxxxxxxx> 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.

Personally I would still prefer to name it COEX_TYPE_1 etc. but I can 
live with this. Would you mind at least adding some comments in the code 
about it?

Cheers,
Jes