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

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Date:   Thu, 2 Apr 2020 11:58:07 +0100
From:   Malcolm Priestley <tvboxspy@...il.com>
To:     Quentin Deslandes <quentin.deslandes@...ev.co.uk>,
        Oscar Carter <oscar.carter@....com>
Cc:     Dan Carpenter <dan.carpenter@...cle.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 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.

Regards

Malcolm