[PATCH rtw-next] wifi: rtw89: pci: disable D3cold on ASUS ExpertBook B3/P3 series

[Ping-Ke Shih <pkshih@realtek.com>]

From: Chin-Yen Lee <timlee@realtek.com>

ASUS ExpertBook models (B3406CMA, B3606CMA, P3406CMA, and P3606CMA) may
encounter PCIe link loss or recovery issues after entering the L2 low-power
state associated with D3cold.

Prevent these affected platforms from entering D3cold to avoid the
problematic PCIe L2 state transition.

Add a DMI quirk match table so that other non-affected platforms can
continue utilizing D3cold power saving.

Signed-off-by: Chin-Yen Lee <timlee@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
---
 drivers/net/wireless/realtek/rtw89/pci.c | 44 ++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/drivers/net/wireless/realtek/rtw89/pci.c b/drivers/net/wireless/realtek/rtw89/pci.c
index 8c3f4eb52cc5..941fb5ca15b6 100644
--- a/drivers/net/wireless/realtek/rtw89/pci.c
+++ b/drivers/net/wireless/realtek/rtw89/pci.c
@@ -4766,6 +4766,49 @@ static const struct rtw89_hci_ops rtw89_pci_ops = {
 	.rst_bdram	= rtw89_pci_reset_bdram,
 };
 
+static void rtw89_pci_d3cold_quirks(struct rtw89_dev *rtwdev, struct pci_dev *pdev)
+{
+	static const struct dmi_system_id d3cold_quirks[] = {
+		{
+			.ident = "ASUS EXPERTBOOK B3406CMA",
+			.matches = {
+				DMI_MATCH(DMI_BOARD_VENDOR, "ASUS"),
+				DMI_MATCH(DMI_BOARD_NAME, "B3406CMA"),
+			},
+		},
+		{
+			.ident = "ASUS EXPERTBOOK B3606CMA",
+			.matches = {
+				DMI_MATCH(DMI_BOARD_VENDOR, "ASUS"),
+				DMI_MATCH(DMI_BOARD_NAME, "B3606CMA"),
+			},
+		},
+		{
+			.ident = "ASUS EXPERTBOOK P3406CMA",
+			.matches = {
+				DMI_MATCH(DMI_BOARD_VENDOR, "ASUS"),
+				DMI_MATCH(DMI_BOARD_NAME, "P3406CMA"),
+			},
+		},
+		{
+			.ident = "ASUS EXPERTBOOK P3606CMA",
+			.matches = {
+				DMI_MATCH(DMI_BOARD_VENDOR, "ASUS"),
+				DMI_MATCH(DMI_BOARD_NAME, "P3606CMA"),
+			},
+		},
+		{},
+	};
+	const struct dmi_system_id *match;
+
+	match = dmi_first_match(d3cold_quirks);
+	if (!match)
+		return;
+
+	rtw89_debug(rtwdev, RTW89_DBG_STATE, "Disable D3Cold on %s\n", match->ident);
+	pci_d3cold_disable(pdev);
+}
+
 int rtw89_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 {
 	struct rtw89_dev *rtwdev;
@@ -4791,6 +4834,7 @@ int rtw89_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	rtwdev->hci.rpwm_addr = pci_info->rpwm_addr;
 	rtwdev->hci.cpwm_addr = pci_info->cpwm_addr;
 
+	rtw89_pci_d3cold_quirks(rtwdev, pdev);
 	rtw89_check_quirks(rtwdev, info->quirks);
 	rtw89_check_pci_ssid_quirks(rtwdev, pdev, pci_info->ssid_quirks);
 

base-commit: f71dd599a98182d6bc34dce39977f928068ecd64
-- 
2.25.1