linux-kernel - Re: [PATCH 1/2] staging: vt6656: Refactor the assignment of the phy->signal variable

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Message-ID: <986e8e5e-245a-cc70-2c6f-8ac3a4a485c9@gmail.com>
Date:   Fri, 10 Apr 2020 16:37:59 +0100
From:   Malcolm Priestley <tvboxspy@...il.com>
To:     Oscar Carter <oscar.carter@....com>,
        Forest Bond <forest@...ttletooquiet.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Quentin Deslandes <quentin.deslandes@...ev.co.uk>,
        Amir Mahdi Ghorbanian <indigoomega021@...il.com>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] staging: vt6656: Refactor the assignment of the
 phy->signal variable



On 10/04/2020 12:28, Oscar Carter wrote:
> Create a constant array with the values of the "phy->signal" for every
> rate. Remove all "phy->signal" assignments inside the switch statement
> and replace these with a single reading from the new vnt_phy_signal
> array.
> 
> Signed-off-by: Oscar Carter <oscar.carter@....com>
> ---
>   drivers/staging/vt6656/baseband.c | 101 +++++++-----------------------
>   1 file changed, 21 insertions(+), 80 deletions(-)
> 
> diff --git a/drivers/staging/vt6656/baseband.c b/drivers/staging/vt6656/baseband.c
> index a19a563d8bcc..47f93bf6e07b 100644
> --- a/drivers/staging/vt6656/baseband.c
> +++ b/drivers/staging/vt6656/baseband.c
> @@ -115,6 +115,21 @@ static const u16 vnt_frame_time[MAX_RATE] = {
>   	10, 20, 55, 110, 24, 36, 48, 72, 96, 144, 192, 216
>   };

Actually you don't need the second values
> 
> +static const u8 vnt_phy_signal[][2] = {
> +	{0x00, 0x00},	/* RATE_1M  */
The driver would never attempt use preamble at this rate
so it's safe to include in with the next 3 rates

> +	{0x01, 0x09},	/* RATE_2M  */
> +	{0x02, 0x0a},	/* RATE_5M  */
> +	{0x03, 0x0b},	/* RATE_11M */
just |= BIT(3) for preamble.

> +	{0x8b, 0x9b},	/* RATE_6M  */
> +	{0x8f, 0x9f},	/* RATE_9M  */
> +	{0x8a, 0x9a},	/* RATE_12M */
> +	{0x8e, 0x9e},	/* RATE_18M */
> +	{0x89, 0x99},	/* RATE_24M */
> +	{0x8d, 0x9d},	/* RATE_36M */
> +	{0x88, 0x98},	/* RATE_48M */
> +	{0x8c, 0x9c}	/* RATE_54M */

Again just |= BIT(4) for PK_TYPE_11A

Regards

Malcolm