[ 046/175] rtlwifi: rtl8192ce: Fix loss of receive performance

From: Greg KH
Date: Fri Mar 30 2012 - 17:52:43 EST

3.3-stable review patch. If anyone has any objections, please let me know.


From: Jingjun Wu <jingjun_wu@xxxxxxxxxxxxxx>

commit a9b89e2567c743483e6354f64d7a7e3a8c101e9e upstream.

Driver rtl8192ce when used with the RTL8188CE device would start at about
20 Mbps on a 54 Mbps connection, but quickly drop to 1 Mbps. One of the
symptoms is that the AP would need to retransmit each packet 4 of 5 times
before the driver would acknowledge it. Recovery is possible only by
unloading and reloading the driver. This problem was reported at

The problem is due to a missing update of the gain setting.

Signed-off-by: Jingjun Wu <jingjun_wu@xxxxxxxxxxxxxx>
Signed-off-by: Larry Finger <Larry.Finger@xxxxxxxxxxxx>
Signed-off-by: John W. Linville <linville@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

drivers/net/wireless/rtlwifi/rtl8192c/dm_common.c | 4 ++++
1 file changed, 4 insertions(+)

--- a/drivers/net/wireless/rtlwifi/rtl8192c/dm_common.c
+++ b/drivers/net/wireless/rtlwifi/rtl8192c/dm_common.c
@@ -524,6 +524,10 @@ void rtl92c_dm_write_dig(struct ieee8021
dm_digtable.cur_igvalue, dm_digtable.pre_igvalue,

+ dm_digtable.cur_igvalue += 2;
+ if (dm_digtable.cur_igvalue > 0x3f)
+ dm_digtable.cur_igvalue = 0x3f;
if (dm_digtable.pre_igvalue != dm_digtable.cur_igvalue) {
rtl_set_bbreg(hw, ROFDM0_XAAGCCORE1, 0x7f,

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