staging: vt6656: Refactor the assignment of the phy->signal variable

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.

The constant array can be of one dimension because the OR mask with
BIT(3) or BIT(4) allow obtain a second value according to the rate,
the preamble_type and the pkt_type.

Signed-off-by: Oscar Carter <oscar.carter@gmx.com>
Link: https://lore.kernel.org/r/20200414153849.5785-5-oscar.carter@gmx.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/vt6656/baseband.c b/drivers/staging/vt6656/baseband.c
index 149c9bba7108a3dcef8f3c7877693a5ebcf4c583..3b6f2bcf91a7dfd222be08c39aeb6b56b059847a 100644 (file)
--- a/drivers/staging/vt6656/baseband.c
+++ b/drivers/staging/vt6656/baseband.c
@@ -196,6 +196,21 @@ static const struct vnt_threshold vt3342_vnt_threshold[] = {
        {41, 0xff, 0x00}
 };
 
+static const u8 vnt_phy_signal[] = {
+       0x00,   /* RATE_1M  */
+       0x01,   /* RATE_2M  */
+       0x02,   /* RATE_5M  */
+       0x03,   /* RATE_11M */
+       0x8b,   /* RATE_6M  */
+       0x8f,   /* RATE_9M  */
+       0x8a,   /* RATE_12M */
+       0x8e,   /* RATE_18M */
+       0x89,   /* RATE_24M */
+       0x8d,   /* RATE_36M */
+       0x88,   /* RATE_48M */
+       0x8c    /* RATE_54M */
+};
+
 /*
  * Description: Calculate data frame transmitting time
  *
@@ -264,6 +279,8 @@ void vnt_get_phy_field(struct vnt_private *priv, u32 frame_length,
        u32 count = 0;
        u32 tmp;
        int ext_bit;
+       int i;
+       u8 mask = 0;
        u8 preamble_type = priv->preamble_type;
 
        bit_count = frame_length * 8;
@@ -272,27 +289,12 @@ void vnt_get_phy_field(struct vnt_private *priv, u32 frame_length,
        switch (tx_rate) {
        case RATE_1M:
                count = bit_count;
-
-               phy->signal = 0x00;
-
                break;
        case RATE_2M:
                count = bit_count / 2;
-
-               if (preamble_type == PREAMBLE_SHORT)
-                       phy->signal = 0x09;
-               else
-                       phy->signal = 0x01;
-
                break;
        case RATE_5M:
                count = DIV_ROUND_UP(bit_count * 10, 55);
-
-               if (preamble_type == PREAMBLE_SHORT)
-                       phy->signal = 0x0a;
-               else
-                       phy->signal = 0x02;
-
                break;
        case RATE_11M:
                count = bit_count / 11;
@@ -305,75 +307,20 @@ void vnt_get_phy_field(struct vnt_private *priv, u32 frame_length,
                                ext_bit = true;
                }
 
-               if (preamble_type == PREAMBLE_SHORT)
-                       phy->signal = 0x0b;
-               else
-                       phy->signal = 0x03;
-
-               break;
-       case RATE_6M:
-               if (pkt_type == PK_TYPE_11A)
-                       phy->signal = 0x9b;
-               else
-                       phy->signal = 0x8b;
-
-               break;
-       case RATE_9M:
-               if (pkt_type == PK_TYPE_11A)
-                       phy->signal = 0x9f;
-               else
-                       phy->signal = 0x8f;
-
-               break;
-       case RATE_12M:
-               if (pkt_type == PK_TYPE_11A)
-                       phy->signal = 0x9a;
-               else
-                       phy->signal = 0x8a;
-
                break;
-       case RATE_18M:
-               if (pkt_type == PK_TYPE_11A)
-                       phy->signal = 0x9e;
-               else
-                       phy->signal = 0x8e;
-
-               break;
-       case RATE_24M:
-               if (pkt_type == PK_TYPE_11A)
-                       phy->signal = 0x99;
-               else
-                       phy->signal = 0x89;
-
-               break;
-       case RATE_36M:
-               if (pkt_type == PK_TYPE_11A)
-                       phy->signal = 0x9d;
-               else
-                       phy->signal = 0x8d;
-
-               break;
-       case RATE_48M:
-               if (pkt_type == PK_TYPE_11A)
-                       phy->signal = 0x98;
-               else
-                       phy->signal = 0x88;
+       }
 
-               break;
-       case RATE_54M:
-               if (pkt_type == PK_TYPE_11A)
-                       phy->signal = 0x9c;
-               else
-                       phy->signal = 0x8c;
-               break;
-       default:
+       if (tx_rate > RATE_11M) {
                if (pkt_type == PK_TYPE_11A)
-                       phy->signal = 0x9c;
-               else
-                       phy->signal = 0x8c;
-               break;
+                       mask = BIT(4);
+       } else if (tx_rate > RATE_1M) {
+               if (preamble_type == PREAMBLE_SHORT)
+                       mask = BIT(3);
        }
 
+       i = tx_rate > RATE_54M ? RATE_54M : tx_rate;
+       phy->signal = vnt_phy_signal[i] | mask;
+
        if (pkt_type == PK_TYPE_11B) {
                phy->service = 0x00;
                if (ext_bit)