wifi: rtw89: pci: add LTR v2 for WiFi 7 chip

PCI LTR (Latency Tolerance Reporting) is a capability to yield expected
power consumption, and we configure the parameters according to design.

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.h

@@ -1317,6 +1317,7 @@ void rtw89_pci_remove(struct pci_dev *pdev);
 void rtw89_pci_ops_reset(struct rtw89_dev *rtwdev);
 int rtw89_pci_ltr_set(struct rtw89_dev *rtwdev, bool en);
 int rtw89_pci_ltr_set_v1(struct rtw89_dev *rtwdev, bool en);
+int rtw89_pci_ltr_set_v2(struct rtw89_dev *rtwdev, bool en);
 u32 rtw89_pci_fill_txaddr_info(struct rtw89_dev *rtwdev,
 			       void *txaddr_info_addr, u32 total_len,
 			       dma_addr_t dma, u8 *add_info_nr);

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

@@ -328,6 +328,63 @@ static int rtw89_pci_ops_mac_pre_init_be(struct rtw89_dev *rtwdev)
 	return 0;
 }
 
+int rtw89_pci_ltr_set_v2(struct rtw89_dev *rtwdev, bool en)
+{
+	u32 ctrl0, cfg0, cfg1, dec_ctrl, idle_ltcy, act_ltcy, dis_ltcy;
+
+	ctrl0 = rtw89_read32(rtwdev, R_BE_LTR_CTRL_0);
+	if (rtw89_pci_ltr_is_err_reg_val(ctrl0))
+		return -EINVAL;
+	cfg0 = rtw89_read32(rtwdev, R_BE_LTR_CFG_0);
+	if (rtw89_pci_ltr_is_err_reg_val(cfg0))
+		return -EINVAL;
+	cfg1 = rtw89_read32(rtwdev, R_BE_LTR_CFG_1);
+	if (rtw89_pci_ltr_is_err_reg_val(cfg1))
+		return -EINVAL;
+	dec_ctrl = rtw89_read32(rtwdev, R_BE_LTR_DECISION_CTRL_V1);
+	if (rtw89_pci_ltr_is_err_reg_val(dec_ctrl))
+		return -EINVAL;
+	idle_ltcy = rtw89_read32(rtwdev, R_BE_LTR_LATENCY_IDX3_V1);
+	if (rtw89_pci_ltr_is_err_reg_val(idle_ltcy))
+		return -EINVAL;
+	act_ltcy = rtw89_read32(rtwdev, R_BE_LTR_LATENCY_IDX1_V1);
+	if (rtw89_pci_ltr_is_err_reg_val(act_ltcy))
+		return -EINVAL;
+	dis_ltcy = rtw89_read32(rtwdev, R_BE_LTR_LATENCY_IDX0_V1);
+	if (rtw89_pci_ltr_is_err_reg_val(dis_ltcy))
+		return -EINVAL;
+
+	if (en) {
+		dec_ctrl |= B_BE_ENABLE_LTR_CTL_DECISION | B_BE_LTR_HW_DEC_EN_V1;
+		ctrl0 |= B_BE_LTR_HW_EN;
+	} else {
+		dec_ctrl &= ~(B_BE_ENABLE_LTR_CTL_DECISION | B_BE_LTR_HW_DEC_EN_V1 |
+			      B_BE_LTR_EN_PORT_V1_MASK);
+		ctrl0 &= ~B_BE_LTR_HW_EN;
+	}
+
+	dec_ctrl = u32_replace_bits(dec_ctrl, PCI_LTR_SPC_500US,
+				    B_BE_LTR_SPACE_IDX_MASK);
+	cfg0 = u32_replace_bits(cfg0, PCI_LTR_IDLE_TIMER_3_2MS,
+				B_BE_LTR_IDLE_TIMER_IDX_MASK);
+	cfg1 = u32_replace_bits(cfg1, 0xC0, B_BE_LTR_CMAC0_RX_USE_PG_TH_MASK);
+	cfg1 = u32_replace_bits(cfg1, 0xC0, B_BE_LTR_CMAC1_RX_USE_PG_TH_MASK);
+	cfg0 = u32_replace_bits(cfg0, 1, B_BE_LTR_IDX_ACTIVE_MASK);
+	cfg0 = u32_replace_bits(cfg0, 3, B_BE_LTR_IDX_IDLE_MASK);
+	dec_ctrl = u32_replace_bits(dec_ctrl, 0, B_BE_LTR_IDX_DISABLE_V1_MASK);
+
+	rtw89_write32(rtwdev, R_BE_LTR_LATENCY_IDX3_V1, 0x90039003);
+	rtw89_write32(rtwdev, R_BE_LTR_LATENCY_IDX1_V1, 0x880b880b);
+	rtw89_write32(rtwdev, R_BE_LTR_LATENCY_IDX0_V1, 0);
+	rtw89_write32(rtwdev, R_BE_LTR_DECISION_CTRL_V1, dec_ctrl);
+	rtw89_write32(rtwdev, R_BE_LTR_CFG_0, cfg0);
+	rtw89_write32(rtwdev, R_BE_LTR_CFG_1, cfg1);
+	rtw89_write32(rtwdev, R_BE_LTR_CTRL_0, ctrl0);
+
+	return 0;
+}
+EXPORT_SYMBOL(rtw89_pci_ltr_set_v2);
+
 const struct rtw89_pci_gen_def rtw89_pci_gen_be = {
 	.mac_pre_init = rtw89_pci_ops_mac_pre_init_be,
 

drivers/net/wireless/realtek/rtw89/reg.h

@@ -3960,6 +3960,49 @@
 #define B_BE_WDT_R_BYPASS BIT(1)
 #define B_BE_WDT_R_ENABLE BIT(0)
 
+#define R_BE_LTR_DECISION_CTRL_V1 0x3610
+#define B_BE_ENABLE_LTR_CTL_DECISION BIT(31)
+#define B_BE_LAT_LTR_IDX_DRV_VLD_V1 BIT(24)
+#define B_BE_LAT_LTR_IDX_DRV_V1_MASK GENMASK(23, 22)
+#define B_BE_LAT_LTR_IDX_FW_VLD_V1 BIT(21)
+#define B_BE_LAT_LTR_IDX_FW_V1_MASK GENMASK(20, 19)
+#define B_BE_LAT_LTR_IDX_HW_VLD_V1 BIT(18)
+#define B_BE_LAT_LTR_IDX_HW_V1_MASK GENMASK(17, 16)
+#define B_BE_LTR_IDX_DRV_V1_MASK GENMASK(15, 14)
+#define B_BE_LTR_REQ_DRV_V1 BIT(13)
+#define B_BE_LTR_IDX_DISABLE_V1_MASK GENMASK(9, 8)
+#define B_BE_LTR_EN_PORT_V1_MASK GENMASK(6, 4)
+#define B_BE_LTR_DRV_DEC_EN_V1 BIT(6)
+#define B_BE_LTR_FW_DEC_EN_V1 BIT(5)
+#define B_BE_LTR_HW_DEC_EN_V1 BIT(4)
+#define B_BE_LTR_SPACE_IDX_MASK GENMASK(1, 0)
+
+#define R_BE_LTR_LATENCY_IDX0_V1 0x3614
+#define R_BE_LTR_LATENCY_IDX1_V1 0x3618
+#define R_BE_LTR_LATENCY_IDX2_V1 0x361C
+#define R_BE_LTR_LATENCY_IDX3_V1 0x3620
+
+#define R_BE_LTR_CTRL_0 0x8410
+#define B_BE_LTR_REQ_FW BIT(18)
+#define B_BE_LTR_IDX_FW_MASK GENMASK(17, 16)
+#define B_BE_LTR_IDLE_TIMER_IDX_MASK GENMASK(10, 8)
+#define B_BE_LTR_WD_NOEMP_CHK BIT(1)
+#define B_BE_LTR_HW_EN BIT(0)
+
+#define R_BE_LTR_CFG_0 0x8414
+#define B_BE_LTR_IDX_DISABLE_MASK GENMASK(17, 16)
+#define B_BE_LTR_IDX_IDLE_MASK GENMASK(15, 14)
+#define B_BE_LTR_IDX_ACTIVE_MASK GENMASK(13, 12)
+#define B_BE_LTR_IDLE_TIMER_IDX_MASK GENMASK(10, 8)
+#define B_BE_EN_LTR_CMAC_RX_USE_PG_CHK BIT(3)
+#define B_BE_EN_LTR_WD_NON_EMPTY_CHK BIT(2)
+#define B_BE_EN_LTR_HAXIDMA_TX_IDLE_CHK BIT(1)
+#define B_BE_EN_LTR_HAXIDMA_RX_IDLE_CHK BIT(0)
+
+#define R_BE_LTR_CFG_1 0x8418
+#define B_BE_LTR_CMAC1_RX_USE_PG_TH_MASK GENMASK(27, 16)
+#define B_BE_LTR_CMAC0_RX_USE_PG_TH_MASK GENMASK(11, 0)
+
 #define R_BE_PLE_DBG_FUN_INTF_CTL 0x9110
 #define B_BE_PLE_DFI_ACTIVE BIT(31)
 #define B_BE_PLE_DFI_TRGSEL_MASK GENMASK(19, 16)

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

@@ -48,6 +48,7 @@ static const struct rtw89_pci_info rtw8922a_pci_info = {
 	.dma_addr_set		= &rtw89_pci_ch_dma_addr_set_be,
 	.bd_ram_table		= NULL,
 
+	.ltr_set		= rtw89_pci_ltr_set_v2,
 	.fill_txaddr_info	= rtw89_pci_fill_txaddr_info_v1,
 };