brcmfmac: Fix set and get tx-power functions.

Implementation of tx-power (get and set) related functions are
still assuming mW interface. This is wrong as functions use dbm
(or mbm) nowadays. As a result a tx power configuration could
result in wrong power configuration.
Reviewed-by: Arend Van Spriel <arend@broadcom.com>
Reviewed-by: Franky (Zhenhui) Lin <frankyl@broadcom.com>
Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Signed-off-by: Hante Meuleman <meuleman@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/brcm80211/brcmfmac/cfg80211.c

@@ -236,89 +236,6 @@ static int brcmf_roamoff;
 module_param_named(roamoff, brcmf_roamoff, int, S_IRUSR);
 MODULE_PARM_DESC(roamoff, "do not use internal roaming engine");
 
-/* Quarter dBm units to mW
- * Table starts at QDBM_OFFSET, so the first entry is mW for qdBm=153
- * Table is offset so the last entry is largest mW value that fits in
- * a u16.
- */
-
-#define QDBM_OFFSET 153		/* Offset for first entry */
-#define QDBM_TABLE_LEN 40	/* Table size */
-
-/* Smallest mW value that will round up to the first table entry, QDBM_OFFSET.
- * Value is ( mW(QDBM_OFFSET - 1) + mW(QDBM_OFFSET) ) / 2
- */
-#define QDBM_TABLE_LOW_BOUND 6493	/* Low bound */
-
-/* Largest mW value that will round down to the last table entry,
- * QDBM_OFFSET + QDBM_TABLE_LEN-1.
- * Value is ( mW(QDBM_OFFSET + QDBM_TABLE_LEN - 1) +
- * mW(QDBM_OFFSET + QDBM_TABLE_LEN) ) / 2.
- */
-#define QDBM_TABLE_HIGH_BOUND 64938	/* High bound */
-
-static const u16 nqdBm_to_mW_map[QDBM_TABLE_LEN] = {
-/* qdBm:	+0	+1	+2	+3	+4	+5	+6	+7 */
-/* 153: */ 6683, 7079, 7499, 7943, 8414, 8913, 9441, 10000,
-/* 161: */ 10593, 11220, 11885, 12589, 13335, 14125, 14962, 15849,
-/* 169: */ 16788, 17783, 18836, 19953, 21135, 22387, 23714, 25119,
-/* 177: */ 26607, 28184, 29854, 31623, 33497, 35481, 37584, 39811,
-/* 185: */ 42170, 44668, 47315, 50119, 53088, 56234, 59566, 63096
-};
-
-static u16 brcmf_qdbm_to_mw(u8 qdbm)
-{
-	uint factor = 1;
-	int idx = qdbm - QDBM_OFFSET;
-
-	if (idx >= QDBM_TABLE_LEN)
-		/* clamp to max u16 mW value */
-		return 0xFFFF;
-
-	/* scale the qdBm index up to the range of the table 0-40
-	 * where an offset of 40 qdBm equals a factor of 10 mW.
-	 */
-	while (idx < 0) {
-		idx += 40;
-		factor *= 10;
-	}
-
-	/* return the mW value scaled down to the correct factor of 10,
-	 * adding in factor/2 to get proper rounding.
-	 */
-	return (nqdBm_to_mW_map[idx] + factor / 2) / factor;
-}
-
-static u8 brcmf_mw_to_qdbm(u16 mw)
-{
-	u8 qdbm;
-	int offset;
-	uint mw_uint = mw;
-	uint boundary;
-
-	/* handle boundary case */
-	if (mw_uint <= 1)
-		return 0;
-
-	offset = QDBM_OFFSET;
-
-	/* move mw into the range of the table */
-	while (mw_uint < QDBM_TABLE_LOW_BOUND) {
-		mw_uint *= 10;
-		offset -= 40;
-	}
-
-	for (qdbm = 0; qdbm < QDBM_TABLE_LEN - 1; qdbm++) {
-		boundary = nqdBm_to_mW_map[qdbm] + (nqdBm_to_mW_map[qdbm + 1] -
-						    nqdBm_to_mW_map[qdbm]) / 2;
-		if (mw_uint < boundary)
-			break;
-	}
-
-	qdbm += (u8) offset;
-
-	return qdbm;
-}
 
 static u16 chandef_to_chanspec(struct brcmu_d11inf *d11inf,
 			       struct cfg80211_chan_def *ch)
@@ -2017,16 +1934,14 @@ static s32
 brcmf_cfg80211_set_tx_power(struct wiphy *wiphy, struct wireless_dev *wdev,
 			    enum nl80211_tx_power_setting type, s32 mbm)
 {
-
 	struct brcmf_cfg80211_info *cfg = wiphy_to_cfg(wiphy);
 	struct net_device *ndev = cfg_to_ndev(cfg);
 	struct brcmf_if *ifp = netdev_priv(ndev);
-	u16 txpwrmw;
-	s32 err = 0;
-	s32 disable = 0;
-	s32 dbm = MBM_TO_DBM(mbm);
+	s32 err;
+	s32 disable;
+	u32 qdbm = 127;
 
-	brcmf_dbg(TRACE, "Enter\n");
+	brcmf_dbg(TRACE, "Enter %d %d\n", type, mbm);
 	if (!check_vif_up(ifp->vif))
 		return -EIO;
 
@@ -2035,12 +1950,20 @@ brcmf_cfg80211_set_tx_power(struct wiphy *wiphy, struct wireless_dev *wdev,
 		break;
 	case NL80211_TX_POWER_LIMITED:
 	case NL80211_TX_POWER_FIXED:
-		if (dbm < 0) {
+		if (mbm < 0) {
 			brcmf_err("TX_POWER_FIXED - dbm is negative\n");
 			err = -EINVAL;
 			goto done;
 		}
+		qdbm =  MBM_TO_DBM(4 * mbm);
+		if (qdbm > 127)
+			qdbm = 127;
+		qdbm |= WL_TXPWR_OVERRIDE;
 		break;
+	default:
+		brcmf_err("Unsupported type %d\n", type);
+		err = -EINVAL;
+		goto done;
 	}
 	/* Make sure radio is off or on as far as software is concerned */
 	disable = WL_RADIO_SW_DISABLE << 16;
@@ -2048,46 +1971,38 @@ brcmf_cfg80211_set_tx_power(struct wiphy *wiphy, struct wireless_dev *wdev,
 	if (err)
 		brcmf_err("WLC_SET_RADIO error (%d)\n", err);
 
-	if (dbm > 0xffff)
-		txpwrmw = 0xffff;
-	else
-		txpwrmw = (u16) dbm;
-	err = brcmf_fil_iovar_int_set(ifp, "qtxpower",
-				      (s32)brcmf_mw_to_qdbm(txpwrmw));
+	err = brcmf_fil_iovar_int_set(ifp, "qtxpower", qdbm);
 	if (err)
 		brcmf_err("qtxpower error (%d)\n", err);
-	cfg->conf->tx_power = dbm;
 
 done:
-	brcmf_dbg(TRACE, "Exit\n");
+	brcmf_dbg(TRACE, "Exit %d (qdbm)\n", qdbm & ~WL_TXPWR_OVERRIDE);
 	return err;
 }
 
-static s32 brcmf_cfg80211_get_tx_power(struct wiphy *wiphy,
-				       struct wireless_dev *wdev,
+static s32
+brcmf_cfg80211_get_tx_power(struct wiphy *wiphy, struct wireless_dev *wdev,
 			    s32 *dbm)
 {
 	struct brcmf_cfg80211_info *cfg = wiphy_to_cfg(wiphy);
-	struct brcmf_if *ifp = netdev_priv(cfg_to_ndev(cfg));
-	s32 txpwrdbm;
-	u8 result;
-	s32 err = 0;
+	struct net_device *ndev = cfg_to_ndev(cfg);
+	struct brcmf_if *ifp = netdev_priv(ndev);
+	s32 qdbm = 0;
+	s32 err;
 
 	brcmf_dbg(TRACE, "Enter\n");
 	if (!check_vif_up(ifp->vif))
 		return -EIO;
 
-	err = brcmf_fil_iovar_int_get(ifp, "qtxpower", &txpwrdbm);
+	err = brcmf_fil_iovar_int_get(ifp, "qtxpower", &qdbm);
 	if (err) {
 		brcmf_err("error (%d)\n", err);
 		goto done;
 	}
-
-	result = (u8) (txpwrdbm & ~WL_TXPWR_OVERRIDE);
-	*dbm = (s32) brcmf_qdbm_to_mw(result);
+	*dbm = (qdbm & ~WL_TXPWR_OVERRIDE) / 4;
 
 done:
-	brcmf_dbg(TRACE, "Exit\n");
+	brcmf_dbg(TRACE, "Exit (0x%x %d)\n", qdbm, *dbm);
 	return err;
 }