According to the Realtek propritary driver and the rtw88 driver, the
tx rates of the ack (includes block ack) are initialized with lower
tx rates (no HT rates) which is set by the RRSR register value. In
real cases, ack rate higher than current tx rate could lead to
difficulty for the receiving end to receive management/control frames.
The retransmission rate would be higher then expected when the driver
is acting as receiver and the RSSI is not good.
Cross out higer rates for ack packet before implementing dynamic rrsr
configuration like the commit 4830872685f8 ("rtw88: add dynamic rrsr
configuration").
Signed-off-by: Chris Chiu <chris.chiu@xxxxxxxxxxxxx>
---
Changelog:
v2:
- Specify the dynamic rrsr commit for reference
- Remove the unintentional twice reading of REG_RESPONSE_RATE_SET
drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c | 6 +++++-
drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_regs.h | 2 ++
2 files changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
index 774341b0005a..a42e2081b75f 100644
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
@@ -4460,13 +4460,17 @@ void rtl8xxxu_gen1_init_aggregation(struct rtl8xxxu_priv *priv)
static void rtl8xxxu_set_basic_rates(struct rtl8xxxu_priv *priv, u32 rate_cfg)
{
+ struct ieee80211_hw *hw = priv->hw;
u32 val32;
u8 rate_idx = 0;
rate_cfg &= RESPONSE_RATE_BITMAP_ALL;
val32 = rtl8xxxu_read32(priv, REG_RESPONSE_RATE_SET);
- val32 &= ~RESPONSE_RATE_BITMAP_ALL;
+ if (hw->conf.chandef.chan->band == NL80211_BAND_5GHZ)
+ val32 &= RESPONSE_RATE_RRSR_INIT_5G;
+ else
+ val32 &= RESPONSE_RATE_RRSR_INIT_2G;
val32 |= rate_cfg;
rtl8xxxu_write32(priv, REG_RESPONSE_RATE_SET, val32);
diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_regs.h b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_regs.h
index a2a31f374a82..438b65ba9640 100644
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_regs.h
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_regs.h
@@ -516,6 +516,8 @@
#define REG_RESPONSE_RATE_SET 0x0440
#define RESPONSE_RATE_BITMAP_ALL 0xfffff
#define RESPONSE_RATE_RRSR_CCK_ONLY_1M 0xffff1
+#define RESPONSE_RATE_RRSR_INIT_2G 0x15f
+#define RESPONSE_RATE_RRSR_INIT_5G 0x150
#define RSR_1M BIT(0)
#define RSR_2M BIT(1)
#define RSR_5_5M BIT(2)
--
2.20.1
