On 05/14/2011 12:01 PM, Rob Browning wrote:
I'm seeing very slow receive rates (~63kb/s) with an EW-7811Un USB
adapter which appears to load the rtl8192cu driver. Is that a known
problem?
I'm currently running the Debian 2.6.39-rc7-amd64 kernel from unstable;
I believe rc7 may be the first Debian kernel to work with this adapter.
I also needed to patch Debian's firmware-realtek package to include the
relevant firmware as detailed here:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=625614.
With respect to the connection quality I see:
Channel:1
Frequency:2.412 GHz (Channel 1)
Quality=65/70 Signal level=-45 dBm
And during transfers "iw event -t" shows nothing other than the
occasional scan started/finished pair.
You are using the correct firmware.
Could you please try the attached patch to see if it improves your throughput?
In addition, please file a Bugzilla report for this problem at
http:bugzilla.kernel.org.
Thanks,
Larry
Index: linux-2.6/drivers/net/wireless/rtlwifi/rtl8192cu/dm.c
===================================================================
--- linux-2.6.orig/drivers/net/wireless/rtlwifi/rtl8192cu/dm.c
+++ linux-2.6/drivers/net/wireless/rtlwifi/rtl8192cu/dm.c
@@ -34,6 +34,27 @@
#include "phy.h"
#include "dm.h"
+static void _rtl92c_dm_restore_power_index(struct ieee80211_hw *hw)
+{
+ struct rtl_priv *rtlpriv = rtl_priv(hw);
+ u8 index;
+ u32 power_index_reg[6] = {0xc90, 0xc91, 0xc92, 0xc98, 0xc99, 0xc9a};
+
+ for(index = 0; index< 6; index++)
+ rtl_write_byte(rtlpriv, power_index_reg[index],
+ rtlpriv->dm.power_index_backup[index]);
+}
+
+static void _rtl92c_dm_write_power_index(struct ieee80211_hw *hw,u8 value)
+{
+ struct rtl_priv *rtlpriv = rtl_priv(hw);
+ u8 index;
+ u32 power_index_reg[6] = {0xc90, 0xc91, 0xc92, 0xc98, 0xc99, 0xc9a};
+
+ for(index = 0; index< 6; index++)
+ rtl_write_byte(rtlpriv, power_index_reg[index], value);
+}
+
void rtl92cu_dm_dynamic_txpower(struct ieee80211_hw *hw)
{
struct rtl_priv *rtlpriv = rtl_priv(hw);
@@ -107,6 +128,17 @@ void rtl92cu_dm_dynamic_txpower(struct i
("PHY_SetTxPowerLevel8192S() Channel = %d\n",
rtlphy->current_channel));
rtl92c_phy_set_txpower_level(hw, rtlphy->current_channel);
+
+ if(rtlpriv->dm.dynamic_txhighpower_lvl == TXHIGHPWRLEVEL_NORMAL)
+ /* HP1 -> Normal or HP2 -> Normal */
+ _rtl92c_dm_restore_power_index(hw);
+ else if(rtlpriv->dm.dynamic_txhighpower_lvl ==
+ TXHIGHPWRLEVEL_LEVEL1)
+ _rtl92c_dm_write_power_index(hw,0x14);
+ else if(rtlpriv->dm.dynamic_txhighpower_lvl ==
+ TXHIGHPWRLEVEL_LEVEL2)
+ _rtl92c_dm_write_power_index(hw,0x10);
+
}
rtlpriv->dm.last_dtp_lvl = rtlpriv->dm.dynamic_txhighpower_lvl;
Index: linux-2.6/drivers/net/wireless/rtlwifi/rtl8192c/dm_common.c
===================================================================
--- linux-2.6.orig/drivers/net/wireless/rtlwifi/rtl8192c/dm_common.c
+++ linux-2.6/drivers/net/wireless/rtlwifi/rtl8192c/dm_common.c
@@ -503,11 +503,33 @@ static void rtl92c_dm_dig(struct ieee802
}
+static void _rtl92c_dm_save_power_index(struct ieee80211_hw *hw)
+{
+ struct rtl_priv *rtlpriv = rtl_priv(hw);
+ u8 index;
+ u32 power_index_reg[6] = {0xc90, 0xc91, 0xc92, 0xc98, 0xc99, 0xc9a};
+
+ for(index = 0; index< 6; index++)
+ rtlpriv->dm.power_index_backup[index] =
+ rtl_read_byte(rtlpriv, power_index_reg[index]);
+}
+
static void rtl92c_dm_init_dynamic_txpower(struct ieee80211_hw *hw)
{
struct rtl_priv *rtlpriv = rtl_priv(hw);
+ struct rtl_hal *rtlhal = rtl_hal(rtlpriv);
+ struct rtl_efuse *rtlefuse = rtl_efuse(rtlpriv);
- rtlpriv->dm.dynamic_txpower_enable = false;
+ if (rtlhal->interface == INTF_PCI) {
+ rtlpriv->dm.dynamic_txpower_enable = false;
+ } else {
+ if (rtlefuse->external_pa) {
+ _rtl92c_dm_save_power_index(hw);
+ rtlpriv->dm.dynamic_txpower_enable = true;
+ } else {
+ rtlpriv->dm.dynamic_txpower_enable = false;
+ }
+ }
rtlpriv->dm.last_dtp_lvl = TXHIGHPWRLEVEL_NORMAL;
rtlpriv->dm.dynamic_txhighpower_lvl = TXHIGHPWRLEVEL_NORMAL;
@@ -541,8 +563,6 @@ static void rtl92c_dm_pwdb_monitor(struc
u8 h2c_parameter[3] = { 0 };
- return;
-
if (tmpentry_max_pwdb != 0) {
rtlpriv->dm.entry_max_undecoratedsmoothed_pwdb =
tmpentry_max_pwdb;
Index: linux-2.6/drivers/net/wireless/rtlwifi/wifi.h
===================================================================
--- linux-2.6.orig/drivers/net/wireless/rtlwifi/wifi.h
+++ linux-2.6/drivers/net/wireless/rtlwifi/wifi.h
@@ -1105,6 +1105,7 @@ struct rtl_dm {
bool disable_tx_int;
char ofdm_index[2];
char cck_index;
+ u8 power_index_backup[6];
};
#define EFUSE_MAX_LOGICAL_SIZE 256
