Navi (new AMD GPU card) doesn't have proper reset method. This is a patch downloaded from https://aur.archlinux.org/cgit/aur.git/tree/navi_reset.patch?h=linux-fix_navi_reset

fix-navi-reset.patch

--- a/drivers/pci/quirks.c	2021-07-04 16:26:40.345636618 +0200
+++ b/drivers/pci/quirks.c	2021-07-04 16:14:15.504916148 +0200
@@ -3998,6 +3998,132 @@
 	return 0;
 }
 
+/*
+ * AMD Navi 10 series GPUs require a vendor specific reset procedure.
+ * According to AMD a PSP mode 2 reset should be enough however at this
+ * time the details of how to perform this are not available to us.
+ * Instead we can signal the SMU to enter and exit BACO which has the same
+ * desired effect.
+ */
+static int reset_amd_navi10(struct pci_dev *dev, bool probe)
+{
+	const int mmMP0_SMN_C2PMSG_81 = 0x16091;
+	const int mmMP1_SMN_C2PMSG_66 = 0x16282;
+	const int mmMP1_SMN_C2PMSG_82 = 0x16292;
+	const int mmMP1_SMN_C2PMSG_90 = 0x1629a;
+
+	u16 cfg;
+	resource_size_t mmio_base, mmio_size;
+	uint32_t __iomem * mmio;
+	unsigned int sol;
+	unsigned int timeout;
+
+	/*
+	 * if the device has FLR return -ENOTTY indicating that we have no
+	 * device-specific reset method.
+	 */
+	if (pcie_reset_flr(dev, true))
+		return -ENOTTY;
+
+	/* bus resets still cause navi to flake out */
+	dev->dev_flags |= PCI_DEV_FLAGS_NO_BUS_RESET;
+
+	if (probe)
+		return 0;
+
+	/* map BAR5 */
+	mmio_base = pci_resource_start(dev, 5);
+	mmio_size = pci_resource_len(dev, 5);
+	mmio = ioremap(mmio_base, mmio_size);
+	if (mmio == NULL) {
+		pci_disable_device(dev);
+		pci_err(dev, "Navi10: cannot iomap device\n");
+		return 0;
+	}
+
+	/* save the PCI state and enable memory access */
+	pci_read_config_word(dev, PCI_COMMAND, &cfg);
+	pci_write_config_word(dev, PCI_COMMAND, cfg | PCI_COMMAND_MEMORY);
+
+	#define SMU_WAIT() \
+	for(timeout = 1000; timeout && (readl(mmio + mmMP1_SMN_C2PMSG_90) & 0xFFFFFFFFL) == 0; --timeout) \
+		udelay(1000); \
+	if (readl(mmio + mmMP1_SMN_C2PMSG_90) != 0x1) \
+		pci_info(dev, "Navi10: SMU error 0x%x (line %d)\n", \
+				readl(mmio + mmMP1_SMN_C2PMSG_90), __LINE__);
+
+	pci_set_power_state(dev, PCI_D0);
+
+	/* it's important we wait for the SOC to be ready */
+	for(timeout = 1000; timeout; --timeout) {
+		sol = readl(mmio + mmMP0_SMN_C2PMSG_81);
+		if (sol != 0xFFFFFFFF)
+			break;
+		udelay(1000);
+	}
+
+	if (sol == 0xFFFFFFFF)
+		pci_warn(dev, "Navi10: timeout waiting for wakeup, continuing anyway\n");
+
+	/* check the sign of life indicator */
+	if (sol == 0x0) {
+		goto out;
+	}
+
+	pci_info(dev, "Navi10: performing BACO reset\n");
+
+	/* save the state around the reset */
+	pci_save_state(dev);
+
+	/* the SMU might be busy already, wait for it */
+	SMU_WAIT();
+
+	/* send PPSMC_MSG_ArmD3 with param */
+	writel(0x00, mmio + mmMP1_SMN_C2PMSG_90);
+	writel(0x00, mmio + mmMP1_SMN_C2PMSG_82); // BACO_SEQ_BACO
+	writel(0x46, mmio + mmMP1_SMN_C2PMSG_66);
+	SMU_WAIT();
+
+	/* send PPSMC_MSG_EnterBaco with param */
+	writel(0x00, mmio + mmMP1_SMN_C2PMSG_90);
+	writel(0x00, mmio + mmMP1_SMN_C2PMSG_82); // BACO_SEQ_BACO
+	writel(0x18, mmio + mmMP1_SMN_C2PMSG_66);
+	SMU_WAIT();
+
+	/* wait for the regulators to shutdown */
+	mdelay(1000);
+
+	/* send PPSMC_MSG_ExitBaco */
+	writel(0x00, mmio + mmMP1_SMN_C2PMSG_90);
+	writel(0x19, mmio + mmMP1_SMN_C2PMSG_66);
+	SMU_WAIT();
+
+	#undef SMU_WAIT
+
+	/* wait for the SOC register to become valid */
+	for(timeout = 1000; timeout; --timeout) {
+		sol = readl(mmio + mmMP0_SMN_C2PMSG_81);
+		if (sol != 0xFFFFFFFF)
+			break;
+		udelay(1000);
+	}
+
+	if (sol != 0x0) {
+		pci_err(dev, "Navi10: sol register = 0x%x\n", sol);
+		goto out;
+	}
+
+out:
+	/* unmap BAR5 */
+	iounmap(mmio);
+
+	/* restore the state and command register */
+	pci_restore_state(dev);
+	pci_write_config_word(dev, PCI_COMMAND, cfg);
+	return 0;
+}
+
+
 static const struct pci_dev_reset_methods pci_dev_reset_methods[] = {
 	{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82599_SFP_VF,
 		 reset_intel_82599_sfp_virtfn },
@@ -4011,6 +4137,13 @@
 		reset_chelsio_generic_dev },
 	{ PCI_VENDOR_ID_HUAWEI, PCI_DEVICE_ID_HINIC_VF,
 		reset_hinic_vf_dev },
+	{ PCI_VENDOR_ID_ATI, 0x7310, reset_amd_navi10 },
+	{ PCI_VENDOR_ID_ATI, 0x7312, reset_amd_navi10 },
+	{ PCI_VENDOR_ID_ATI, 0x7318, reset_amd_navi10 },
+	{ PCI_VENDOR_ID_ATI, 0x7319, reset_amd_navi10 },
+	{ PCI_VENDOR_ID_ATI, 0x731a, reset_amd_navi10 },
+	{ PCI_VENDOR_ID_ATI, 0x731b, reset_amd_navi10 },
+	{ PCI_VENDOR_ID_ATI, 0x731f, reset_amd_navi10 },
 	{ 0 }
 };