wifi: rtw89: pci: update interrupt mitigation register for 8922AE

To reduce interrupts, configure the mitigation setting of 8922AE when
bringing interface up, and then check situations to decide turning on or
off the function. With this, interrupt count decreases to 20,141 from
202,141 in period of 20 seconds.

Signed-off-by: Ping-Ke Shih <[email protected]>
Signed-off-by: Kalle Valo <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: Ping-Ke Shih

drivers/net/wireless/realtek/rtw89/pci.c

@@ -3620,19 +3620,26 @@ static void rtw89_pci_aspm_set(struct rtw89_dev *rtwdev, bool enable)
 
 static void rtw89_pci_recalc_int_mit(struct rtw89_dev *rtwdev)
 {
+	enum rtw89_chip_gen chip_gen = rtwdev->chip->chip_gen;
 	const struct rtw89_pci_info *info = rtwdev->pci_info;
 	struct rtw89_traffic_stats *stats = &rtwdev->stats;
 	enum rtw89_tfc_lv tx_tfc_lv = stats->tx_tfc_lv;
 	enum rtw89_tfc_lv rx_tfc_lv = stats->rx_tfc_lv;
 	u32 val = 0;
 
-	if (!rtwdev->scanning &&
-	    (tx_tfc_lv >= RTW89_TFC_HIGH || rx_tfc_lv >= RTW89_TFC_HIGH))
+	if (rtwdev->scanning ||
+	    (tx_tfc_lv < RTW89_TFC_HIGH && rx_tfc_lv < RTW89_TFC_HIGH))
+		goto out;
+
+	if (chip_gen == RTW89_CHIP_BE)
+		val = B_BE_PCIE_MIT_RX0P2_EN | B_BE_PCIE_MIT_RX0P1_EN;
+	else
 		val = B_AX_RXMIT_RXP2_SEL | B_AX_RXMIT_RXP1_SEL |
 		      FIELD_PREP(B_AX_RXCOUNTER_MATCH_MASK, RTW89_PCI_RXBD_NUM_MAX / 2) |
 		      FIELD_PREP(B_AX_RXTIMER_UNIT_MASK, AX_RXTIMER_UNIT_64US) |
 		      FIELD_PREP(B_AX_RXTIMER_MATCH_MASK, 2048 / 64);
 
+out:
 	rtw89_write32(rtwdev, info->mit_addr, val);
 }
 

drivers/net/wireless/realtek/rtw89/rtw8922ae.c

@@ -43,6 +43,7 @@ static const struct rtw89_pci_info rtw8922a_pci_info = {
 
 	.rpwm_addr		= R_BE_PCIE_HRPWM,
 	.cpwm_addr		= R_BE_PCIE_CRPWM,
+	.mit_addr		= R_BE_PCIE_MIT_CH_EN,
 	.tx_dma_ch_mask		= 0,
 	.bd_idx_addr_low_power	= NULL,
 	.dma_addr_set		= &rtw89_pci_ch_dma_addr_set_be,