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Date: Mon, 30 Mar 2020 16:34:04 +0100
From: Quentin Deslandes <quentin.deslandes@...ev.co.uk>
To: Oscar Carter <oscar.carter@....com>
Cc: Forest Bond <forest@...ttletooquiet.net>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Malcolm Priestley <tvboxspy@...il.com>,
Amir Mahdi Ghorbanian <indigoomega021@...il.com>,
devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: vt6656: Refactor the
vnt_update_pre_ed_threshold function
On 03/28/20 19:17:06, Oscar Carter wrote:
> Create three arrays with the threshold data use in the switch statement
> of the vnt_update_pre_ed_threshold function. These three arrays contains
> elements of struct vnt_threshold new type.
>
> Create a for loop in the vnt_update_pre_ed_threshold function to do
> exactly the same that the if-elseif-else statements in the switch
> statement.
>
> Also, remove the if check against the !cr_201 && !cr_206 due to now it
> is replace by the NULL check against the threshold pointer. When this
> pointer is NULL means that the cr_201 and cr_206 variables have not been
> assigned, that is the same that the old comparison against cr_201 and
> cr_206 due to these variables were initialized with 0.
>
> The statistics of the old baseband object file are:
>
> section size addr
> .text 3415 0
> .data 576 0
> .bss 0 0
> .rodata 120 0
> .comment 45 0
> .note.GNU-stack 0 0
> .note.gnu.property 28 0
> Total 4184
>
> The statistics of the new baseband object file are:
>
> section size addr
> .text 2209 0
> .data 576 0
> .bss 0 0
> .rodata 344 0
> .comment 45 0
> .note.GNU-stack 0 0
> .note.gnu.property 28 0
> Total 3202
>
> With this refactoring it increase a little the readonly data but it
> decrease much more the .text section. This refactoring decrease the
> footprint and makes the code more clear.
>
> Signed-off-by: Oscar Carter <oscar.carter@....com>
> ---
> drivers/staging/vt6656/baseband.c | 335 +++++++++---------------------
> 1 file changed, 100 insertions(+), 235 deletions(-)
>
> diff --git a/drivers/staging/vt6656/baseband.c b/drivers/staging/vt6656/baseband.c
> index a19a563d8bcc..e03f83e1c394 100644
> --- a/drivers/staging/vt6656/baseband.c
> +++ b/drivers/staging/vt6656/baseband.c
> @@ -115,6 +115,86 @@ static const u16 vnt_frame_time[MAX_RATE] = {
> 10, 20, 55, 110, 24, 36, 48, 72, 96, 144, 192, 216
> };
>
> +struct vnt_threshold {
> + u8 bb_pre_ed_rssi;
> + u8 cr_201;
> + u8 cr_206;
> +};
> +
> +static const struct vnt_threshold al2230_vnt_threshold[] = {
> + {0, 0x00, 0x30}, /* Max sensitivity */
> + {68, 0x00, 0x36},
> + {67, 0x00, 0x43},
> + {66, 0x00, 0x51},
> + {65, 0x00, 0x62},
> + {64, 0x00, 0x79},
> + {63, 0x00, 0x93},
> + {62, 0x00, 0xb9},
> + {61, 0x00, 0xe3},
> + {60, 0x01, 0x18},
> + {59, 0x01, 0x54},
> + {58, 0x01, 0xa0},
> + {57, 0x02, 0x20},
> + {56, 0x02, 0xa0},
> + {55, 0x03, 0x00},
> + {53, 0x06, 0x00},
> + {51, 0x09, 0x00},
> + {49, 0x0e, 0x00},
> + {47, 0x15, 0x00},
> + {46, 0x1a, 0x00},
> + {45, 0xff, 0x00}
> +};
> +
> +static const struct vnt_threshold vt3226_vnt_threshold[] = {
> + {0, 0x00, 0x24}, /* Max sensitivity */
> + {68, 0x00, 0x2d},
> + {67, 0x00, 0x36},
> + {66, 0x00, 0x43},
> + {65, 0x00, 0x52},
> + {64, 0x00, 0x68},
> + {63, 0x00, 0x80},
> + {62, 0x00, 0x9c},
> + {61, 0x00, 0xc0},
> + {60, 0x00, 0xea},
> + {59, 0x01, 0x30},
> + {58, 0x01, 0x70},
> + {57, 0x01, 0xb0},
> + {56, 0x02, 0x30},
> + {55, 0x02, 0xc0},
> + {53, 0x04, 0x00},
> + {51, 0x07, 0x00},
> + {49, 0x0a, 0x00},
> + {47, 0x11, 0x00},
> + {45, 0x18, 0x00},
> + {43, 0x26, 0x00},
> + {42, 0x36, 0x00},
> + {41, 0xff, 0x00}
> +};
> +
> +static const struct vnt_threshold vt3342_vnt_threshold[] = {
> + {0, 0x00, 0x38}, /* Max sensitivity */
> + {66, 0x00, 0x43},
> + {65, 0x00, 0x52},
> + {64, 0x00, 0x68},
> + {63, 0x00, 0x80},
> + {62, 0x00, 0x9c},
> + {61, 0x00, 0xc0},
> + {60, 0x00, 0xea},
> + {59, 0x01, 0x30},
> + {58, 0x01, 0x70},
> + {57, 0x01, 0xb0},
> + {56, 0x02, 0x30},
> + {55, 0x02, 0xc0},
> + {53, 0x04, 0x00},
> + {51, 0x07, 0x00},
> + {49, 0x0a, 0x00},
> + {47, 0x11, 0x00},
> + {45, 0x18, 0x00},
> + {43, 0x26, 0x00},
> + {42, 0x36, 0x00},
> + {41, 0xff, 0x00}
> +};
> +
> /*
> * Description: Calculate data frame transmitting time
> *
> @@ -572,254 +652,42 @@ int vnt_exit_deep_sleep(struct vnt_private *priv)
>
> void vnt_update_pre_ed_threshold(struct vnt_private *priv, int scanning)
> {
> - u8 cr_201 = 0x0, cr_206 = 0x0;
> + const struct vnt_threshold *threshold = NULL;
> + u8 length;
> + u8 cr_201, cr_206;
> u8 ed_inx = priv->bb_pre_ed_index;
>
> switch (priv->rf_type) {
> case RF_AL2230:
> case RF_AL2230S:
> case RF_AIROHA7230:
> - if (scanning) { /* Max sensitivity */
> - ed_inx = 0;
> - cr_206 = 0x30;
> - break;
> - }
> -
> - if (priv->bb_pre_ed_rssi <= 45) {
> - ed_inx = 20;
> - cr_201 = 0xff;
> - } else if (priv->bb_pre_ed_rssi <= 46) {
> - ed_inx = 19;
> - cr_201 = 0x1a;
> - } else if (priv->bb_pre_ed_rssi <= 47) {
> - ed_inx = 18;
> - cr_201 = 0x15;
> - } else if (priv->bb_pre_ed_rssi <= 49) {
> - ed_inx = 17;
> - cr_201 = 0xe;
> - } else if (priv->bb_pre_ed_rssi <= 51) {
> - ed_inx = 16;
> - cr_201 = 0x9;
> - } else if (priv->bb_pre_ed_rssi <= 53) {
> - ed_inx = 15;
> - cr_201 = 0x6;
> - } else if (priv->bb_pre_ed_rssi <= 55) {
> - ed_inx = 14;
> - cr_201 = 0x3;
> - } else if (priv->bb_pre_ed_rssi <= 56) {
> - ed_inx = 13;
> - cr_201 = 0x2;
> - cr_206 = 0xa0;
> - } else if (priv->bb_pre_ed_rssi <= 57) {
> - ed_inx = 12;
> - cr_201 = 0x2;
> - cr_206 = 0x20;
> - } else if (priv->bb_pre_ed_rssi <= 58) {
> - ed_inx = 11;
> - cr_201 = 0x1;
> - cr_206 = 0xa0;
> - } else if (priv->bb_pre_ed_rssi <= 59) {
> - ed_inx = 10;
> - cr_201 = 0x1;
> - cr_206 = 0x54;
> - } else if (priv->bb_pre_ed_rssi <= 60) {
> - ed_inx = 9;
> - cr_201 = 0x1;
> - cr_206 = 0x18;
> - } else if (priv->bb_pre_ed_rssi <= 61) {
> - ed_inx = 8;
> - cr_206 = 0xe3;
> - } else if (priv->bb_pre_ed_rssi <= 62) {
> - ed_inx = 7;
> - cr_206 = 0xb9;
> - } else if (priv->bb_pre_ed_rssi <= 63) {
> - ed_inx = 6;
> - cr_206 = 0x93;
> - } else if (priv->bb_pre_ed_rssi <= 64) {
> - ed_inx = 5;
> - cr_206 = 0x79;
> - } else if (priv->bb_pre_ed_rssi <= 65) {
> - ed_inx = 4;
> - cr_206 = 0x62;
> - } else if (priv->bb_pre_ed_rssi <= 66) {
> - ed_inx = 3;
> - cr_206 = 0x51;
> - } else if (priv->bb_pre_ed_rssi <= 67) {
> - ed_inx = 2;
> - cr_206 = 0x43;
> - } else if (priv->bb_pre_ed_rssi <= 68) {
> - ed_inx = 1;
> - cr_206 = 0x36;
> - } else {
> - ed_inx = 0;
> - cr_206 = 0x30;
> - }
> + threshold = al2230_vnt_threshold;
> + length = ARRAY_SIZE(al2230_vnt_threshold);
> break;
>
> case RF_VT3226:
> case RF_VT3226D0:
> - if (scanning) { /* Max sensitivity */
> - ed_inx = 0;
> - cr_206 = 0x24;
> - break;
> - }
> -
> - if (priv->bb_pre_ed_rssi <= 41) {
> - ed_inx = 22;
> - cr_201 = 0xff;
> - } else if (priv->bb_pre_ed_rssi <= 42) {
> - ed_inx = 21;
> - cr_201 = 0x36;
> - } else if (priv->bb_pre_ed_rssi <= 43) {
> - ed_inx = 20;
> - cr_201 = 0x26;
> - } else if (priv->bb_pre_ed_rssi <= 45) {
> - ed_inx = 19;
> - cr_201 = 0x18;
> - } else if (priv->bb_pre_ed_rssi <= 47) {
> - ed_inx = 18;
> - cr_201 = 0x11;
> - } else if (priv->bb_pre_ed_rssi <= 49) {
> - ed_inx = 17;
> - cr_201 = 0xa;
> - } else if (priv->bb_pre_ed_rssi <= 51) {
> - ed_inx = 16;
> - cr_201 = 0x7;
> - } else if (priv->bb_pre_ed_rssi <= 53) {
> - ed_inx = 15;
> - cr_201 = 0x4;
> - } else if (priv->bb_pre_ed_rssi <= 55) {
> - ed_inx = 14;
> - cr_201 = 0x2;
> - cr_206 = 0xc0;
> - } else if (priv->bb_pre_ed_rssi <= 56) {
> - ed_inx = 13;
> - cr_201 = 0x2;
> - cr_206 = 0x30;
> - } else if (priv->bb_pre_ed_rssi <= 57) {
> - ed_inx = 12;
> - cr_201 = 0x1;
> - cr_206 = 0xb0;
> - } else if (priv->bb_pre_ed_rssi <= 58) {
> - ed_inx = 11;
> - cr_201 = 0x1;
> - cr_206 = 0x70;
> - } else if (priv->bb_pre_ed_rssi <= 59) {
> - ed_inx = 10;
> - cr_201 = 0x1;
> - cr_206 = 0x30;
> - } else if (priv->bb_pre_ed_rssi <= 60) {
> - ed_inx = 9;
> - cr_206 = 0xea;
> - } else if (priv->bb_pre_ed_rssi <= 61) {
> - ed_inx = 8;
> - cr_206 = 0xc0;
> - } else if (priv->bb_pre_ed_rssi <= 62) {
> - ed_inx = 7;
> - cr_206 = 0x9c;
> - } else if (priv->bb_pre_ed_rssi <= 63) {
> - ed_inx = 6;
> - cr_206 = 0x80;
> - } else if (priv->bb_pre_ed_rssi <= 64) {
> - ed_inx = 5;
> - cr_206 = 0x68;
> - } else if (priv->bb_pre_ed_rssi <= 65) {
> - ed_inx = 4;
> - cr_206 = 0x52;
> - } else if (priv->bb_pre_ed_rssi <= 66) {
> - ed_inx = 3;
> - cr_206 = 0x43;
> - } else if (priv->bb_pre_ed_rssi <= 67) {
> - ed_inx = 2;
> - cr_206 = 0x36;
> - } else if (priv->bb_pre_ed_rssi <= 68) {
> - ed_inx = 1;
> - cr_206 = 0x2d;
> - } else {
> - ed_inx = 0;
> - cr_206 = 0x24;
> - }
> + threshold = vt3226_vnt_threshold;
> + length = ARRAY_SIZE(vt3226_vnt_threshold);
> break;
>
> case RF_VT3342A0:
> - if (scanning) { /* need Max sensitivity */
> - ed_inx = 0;
> - cr_206 = 0x38;
> - break;
> - }
> -
> - if (priv->bb_pre_ed_rssi <= 41) {
> - ed_inx = 20;
> - cr_201 = 0xff;
> - } else if (priv->bb_pre_ed_rssi <= 42) {
> - ed_inx = 19;
> - cr_201 = 0x36;
> - } else if (priv->bb_pre_ed_rssi <= 43) {
> - ed_inx = 18;
> - cr_201 = 0x26;
> - } else if (priv->bb_pre_ed_rssi <= 45) {
> - ed_inx = 17;
> - cr_201 = 0x18;
> - } else if (priv->bb_pre_ed_rssi <= 47) {
> - ed_inx = 16;
> - cr_201 = 0x11;
> - } else if (priv->bb_pre_ed_rssi <= 49) {
> - ed_inx = 15;
> - cr_201 = 0xa;
> - } else if (priv->bb_pre_ed_rssi <= 51) {
> - ed_inx = 14;
> - cr_201 = 0x7;
> - } else if (priv->bb_pre_ed_rssi <= 53) {
> - ed_inx = 13;
> - cr_201 = 0x4;
> - } else if (priv->bb_pre_ed_rssi <= 55) {
> - ed_inx = 12;
> - cr_201 = 0x2;
> - cr_206 = 0xc0;
> - } else if (priv->bb_pre_ed_rssi <= 56) {
> - ed_inx = 11;
> - cr_201 = 0x2;
> - cr_206 = 0x30;
> - } else if (priv->bb_pre_ed_rssi <= 57) {
> - ed_inx = 10;
> - cr_201 = 0x1;
> - cr_206 = 0xb0;
> - } else if (priv->bb_pre_ed_rssi <= 58) {
> - ed_inx = 9;
> - cr_201 = 0x1;
> - cr_206 = 0x70;
> - } else if (priv->bb_pre_ed_rssi <= 59) {
> - ed_inx = 8;
> - cr_201 = 0x1;
> - cr_206 = 0x30;
> - } else if (priv->bb_pre_ed_rssi <= 60) {
> - ed_inx = 7;
> - cr_206 = 0xea;
> - } else if (priv->bb_pre_ed_rssi <= 61) {
> - ed_inx = 6;
> - cr_206 = 0xc0;
> - } else if (priv->bb_pre_ed_rssi <= 62) {
> - ed_inx = 5;
> - cr_206 = 0x9c;
> - } else if (priv->bb_pre_ed_rssi <= 63) {
> - ed_inx = 4;
> - cr_206 = 0x80;
> - } else if (priv->bb_pre_ed_rssi <= 64) {
> - ed_inx = 3;
> - cr_206 = 0x68;
> - } else if (priv->bb_pre_ed_rssi <= 65) {
> - ed_inx = 2;
> - cr_206 = 0x52;
> - } else if (priv->bb_pre_ed_rssi <= 66) {
> - ed_inx = 1;
> - cr_206 = 0x43;
> - } else {
> - ed_inx = 0;
> - cr_206 = 0x38;
> - }
> + threshold = vt3342_vnt_threshold;
> + length = ARRAY_SIZE(vt3342_vnt_threshold);
> break;
> }
>
> + if (!threshold)
> + return;
> +
> + for (ed_inx = scanning ? 0 : length - 1; ed_inx > 0; ed_inx--) {
> + if (priv->bb_pre_ed_rssi <= threshold[ed_inx].bb_pre_ed_rssi)
> + break;
> + }
> +
> + cr_201 = threshold[ed_inx].cr_201;
> + cr_206 = threshold[ed_inx].cr_206;
> +
> if (ed_inx == priv->bb_pre_ed_index && !scanning)
> return;
>
> @@ -828,9 +696,6 @@ void vnt_update_pre_ed_threshold(struct vnt_private *priv, int scanning)
> dev_dbg(&priv->usb->dev, "%s bb_pre_ed_rssi %d\n",
> __func__, priv->bb_pre_ed_rssi);
>
> - if (!cr_201 && !cr_206)
> - return;
> -
> vnt_control_out_u8(priv, MESSAGE_REQUEST_BBREG, 0xc9, cr_201);
> vnt_control_out_u8(priv, MESSAGE_REQUEST_BBREG, 0xce, cr_206);
> }
> --
> 2.20.1
>
Looks good to me, nice job.
Reviewed-by: Quentin Deslandes <quentin.deslandes@...ev.co.uk>
Thanks,
Quentin
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