rtl8187: Fix error in setting OFDM power settings for RTL8187L

commit eb83bbf57429ab80f49b413e3e44d3b19c3fdc5a upstream.

After reports of poor performance, a review of the latest vendor driver
(rtl8187_linux_26.1025.0328.2007) for RTL8187L devices was undertaken.

A difference was found in the code used to index the OFDM power tables. When
the Linux driver was changed, my unit works at a much greater range than
before. I think this fixes Bugzilla #12380 and has been tested by at least
two other users.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Tested-by: Martín Ernesto Barreyro <barreyromartin@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/net/wireless/rtl8187_rtl8225.c b/drivers/net/wireless/rtl8187_rtl8225.c
index 1bae8990341096913c6800c19df076ac4f7e208a..487593f6efe269cc48d283bf097048e199d1fa64 100644 (file)
--- a/drivers/net/wireless/rtl8187_rtl8225.c
+++ b/drivers/net/wireless/rtl8187_rtl8225.c
@@ -287,7 +287,10 @@ static void rtl8225_rf_set_tx_power(struct ieee80211_hw *dev, int channel)
        ofdm_power = priv->channels[channel - 1].hw_value >> 4;
 
        cck_power = min(cck_power, (u8)11);
-       ofdm_power = min(ofdm_power, (u8)35);
+       if (ofdm_power > (u8)15)
+               ofdm_power = 25;
+       else
+               ofdm_power += 10;
 
        rtl818x_iowrite8(priv, &priv->map->TX_GAIN_CCK,
                         rtl8225_tx_gain_cck_ofdm[cck_power / 6] >> 1);
@@ -540,7 +543,10 @@ static void rtl8225z2_rf_set_tx_power(struct ieee80211_hw *dev, int channel)
        cck_power += priv->txpwr_base & 0xF;
        cck_power = min(cck_power, (u8)35);
 
-       ofdm_power = min(ofdm_power, (u8)15);
+       if (ofdm_power > (u8)15)
+               ofdm_power = 25;
+       else
+               ofdm_power += 10;
        ofdm_power += priv->txpwr_base >> 4;
        ofdm_power = min(ofdm_power, (u8)35);