[PATCH 1/1][SRU][J] rtw88: pci: 8821c: Disable 21ce completion timeout

[Chris Chiu]

From: Po-Hao Huang <phhuang at realtek.com>

BugLink: https://bugs.launchpad.net/bugs/1969771

Disable this capability to avoid timeout errors on certain platforms.
Without it, pci bus might stuck and leads to disconnection.

Signed-off-by: Po-Hao Huang <phhuang at realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih at realtek.com>
Tested-by: Chris Chiu <chris.chiu at canonical.com>
Signed-off-by: Kalle Valo <kvalo at kernel.org>
Link: https://lore.kernel.org/r/20220420093058.31646-2-pkshih@realtek.com
(cherry picked from commit 9ebacb1e7e75f2a7a9745d42da7031d3a1741029)
Signed-off-by: Chris Chiu <chris.chiu at canonical.com>
---
 drivers/net/wireless/realtek/rtw88/pci.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/net/wireless/realtek/rtw88/pci.c b/drivers/net/wireless/realtek/rtw88/pci.c
index 70ca338ed180..d6aaca75516c 100644
--- a/drivers/net/wireless/realtek/rtw88/pci.c
+++ b/drivers/net/wireless/realtek/rtw88/pci.c
@@ -1478,12 +1478,15 @@ static void rtw_pci_interface_cfg(struct rtw_dev *rtwdev)
 
 static void rtw_pci_phy_cfg(struct rtw_dev *rtwdev)
 {
+	struct rtw_pci *rtwpci = (struct rtw_pci *)rtwdev->priv;
 	struct rtw_chip_info *chip = rtwdev->chip;
+	struct pci_dev *pdev = rtwpci->pdev;
 	const struct rtw_intf_phy_para *para;
 	u16 cut;
 	u16 value;
 	u16 offset;
 	int i;
+	int ret;
 
 	cut = BIT(0) << rtwdev->hal.cut_version;
 
@@ -1516,6 +1519,15 @@ static void rtw_pci_phy_cfg(struct rtw_dev *rtwdev)
 	}
 
 	rtw_pci_link_cfg(rtwdev);
+
+	/* Disable 8821ce completion timeout by default */
+	if (chip->id == RTW_CHIP_TYPE_8821C) {
+		ret = pcie_capability_set_word(pdev, PCI_EXP_DEVCTL2,
+					       PCI_EXP_DEVCTL2_COMP_TMOUT_DIS);
+		if (ret)
+			rtw_err(rtwdev, "failed to set PCI cap, ret = %d\n",
+				ret);
+	}
 }
 
 static int __maybe_unused rtw_pci_suspend(struct device *dev)
-- 
2.25.1