linux-kernel - Re: [PATCH] staging: vt6656: Use defines in vnt_mac_reg_bits

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Message-ID: <20200402161825.GA3939@ubuntu>
Date:   Thu, 2 Apr 2020 18:18:25 +0200
From:   Oscar Carter <oscar.carter@....com>
To:     Dan Carpenter <dan.carpenter@...cle.com>,
        Malcolm Priestley <tvboxspy@...il.com>,
        Quentin Deslandes <quentin.deslandes@...ev.co.uk>
Cc:     Oscar Carter <oscar.carter@....com>,
        Forest Bond <forest@...ttletooquiet.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Amir Mahdi Ghorbanian <indigoomega021@...il.com>,
        Colin Ian King <colin.king@...onical.com>,
        Gabriela Bittencourt <gabrielabittencourt00@...il.com>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: vt6656: Use defines in vnt_mac_reg_bits_*
 functions

On Thu, Apr 02, 2020 at 11:58:07AM +0100, Malcolm Priestley wrote:
>
>
> On 02/04/2020 10:19, Quentin Deslandes wrote:
> > On 04/01/20 18:55:38, Oscar Carter wrote:
> > > On Tue, Mar 31, 2020 at 01:29:06PM +0300, Dan Carpenter wrote:
> > > > On Sat, Mar 28, 2020 at 10:54:33AM +0100, Oscar Carter wrote:
> > > > > Define the necessary bits in the CHANNEL, PAPEDELAY and GPIOCTL0
> > > > > registers to can use them in the calls to vnt_mac_reg_bits_on and
> > > > > vnt_mac_reg_bits_off functions. In this way, avoid the use of BIT()
> > > > > macros and clarify the code.
> > > > >
> > > > > Fixes: 3017e587e368 ("staging: vt6656: Use BIT() macro in vnt_mac_reg_bits_* functions")
> > > > > Suggested-by: Dan Carpenter <dan.carpenter@...cle.com>
> > > > > Signed-off-by: Oscar Carter <oscar.carter@....com>
> > > > > ---
> > > > >   drivers/staging/vt6656/baseband.c |  6 ++++--
> > > > >   drivers/staging/vt6656/card.c     |  3 +--
> > > > >   drivers/staging/vt6656/mac.h      | 12 ++++++++++++
> > > > >   drivers/staging/vt6656/main_usb.c |  2 +-
> > > > >   4 files changed, 18 insertions(+), 5 deletions(-)
> > > > >
> > > > > diff --git a/drivers/staging/vt6656/baseband.c b/drivers/staging/vt6656/baseband.c
> > > > > index a19a563d8bcc..dd3c3bf5e8b5 100644
> > > > > --- a/drivers/staging/vt6656/baseband.c
> > > > > +++ b/drivers/staging/vt6656/baseband.c
> > > > > @@ -442,7 +442,8 @@ int vnt_vt3184_init(struct vnt_private *priv)
> > > > >   		if (ret)
> > > > >   			goto end;
> > > > >
> > > > > -		ret = vnt_mac_reg_bits_on(priv, MAC_REG_PAPEDELAY, BIT(0));
> > > > > +		ret = vnt_mac_reg_bits_on(priv, MAC_REG_PAPEDELAY,
> > > > > +					  PAPEDELAY_B0);
> > > >
> > > > This doesn't clarify anything.  It makes it less clear because someone
> > > > would assume B0 means something but it's just hiding a magic number
> > > > behind a meaningless define.  B0 means BIT(0) which means nothing.  So
> > > > now we have to jump through two hoops to find out that we don't know
> > > > anything.
> > > >
> > > I created this names due to the lack of information about the hardware. I
> > > searched but I did not find anything.
> > >
> > > > Just leave it as-is.  Same for the rest.
> > > Ok.
> > >
> > > >
> > > > There problem is a hardware spec which explains what this stuff is.
> > > >
> > > It's possible to find a datasheet of this hardware to make this modification
> > > accordingly to the correct bit names of registers ?
> >
> > I haven't found any so far, if your researches are luckier than mine, I
> > would be interested too. Even getting your hands on the actual device is
> > complicated.
>
> All I can tell you is it related to command above it MAC_REG_ITRTMSET
> without it the device will not associate with access point is probably TX
> timing/power rated.
>
> Other bits in MAC_REG_PAPEDELAY are related to LED function and defined in
> LEDSTS_* in mac.h.
>
> I think it is some kind of enable so something like ITRTMSET_ENABLE would
> do.
>
I think the best for now is leave it as-is due to the lack of information about
bit names of registers.

> Regards
>
> Malcolm

Thanks,

Oscar carter