rtw89: 8852c: disable dma during mac init

Without this patch, our hardware attempts to perform dma while device
cpu restarts, and leads to iommu page faults caused by invalid requests.
Some platforms show warning messages as below:
rtw89_8852ce 0000:01:00.0: AMD-Vi: Event logged [IO_PAGE_FAULT
domain=0x000a address=0x10000000004 flags=0x0030]

Signed-off-by: Po-Hao Huang <phhuang@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20220704023453.19935-2-pkshih@realtek.com

diff --git a/drivers/net/wireless/realtek/rtw89/pci.c b/drivers/net/wireless/realtek/rtw89/pci.c
index 7fdd592bfb8255e3d25201b5ad0e8886e8c9fd93..d00f152543dafc9737fd18656d3ef9b4340e6210 100644 (file)
--- a/drivers/net/wireless/realtek/rtw89/pci.c
+++ b/drivers/net/wireless/realtek/rtw89/pci.c
@@ -1627,6 +1627,8 @@ static void rtw89_pci_ctrl_dma_all(struct rtw89_dev *rtwdev, bool enable)
                else
                        rtw89_write32_clr(rtwdev, R_AX_PCIE_INIT_CFG1,
                                          B_AX_STOP_AXI_MST);
+               rtw89_write32_clr(rtwdev, R_AX_PCIE_INIT_CFG1,
+                                 txhci_en | rxhci_en);
                if (chip_id == RTL8852C)
                        rtw89_write32_set(rtwdev, R_AX_PCIE_INIT_CFG1,
                                          B_AX_STOP_AXI_MST);