static int reset_amdgpu_vega(struct pci_dev *dev, int probe) {
#define AMDGPU_MAX_USEC_TIMEOUT      100000
#define MP0_BASE                     0x16000
#define mmMP0_SMN_C2PMSG_33          ((MP0_BASE + 0x0061) * 4)
#define mmMP0_SMN_C2PMSG_64          ((MP0_BASE + 0x0080) * 4)
#define mmMP0_SMN_C2PMSG_81          ((MP0_BASE + 0x0091) * 4)

        resource_size_t rmmio_base, rmmio_size;
        void __iomem *rmmio;
        int ret;
        int i;
        uint32_t val;

        if (probe)
                return 0;

        pci_clear_master(dev);
        pci_save_state(dev);

        rmmio_base = pci_resource_start(dev, 5);
        rmmio_size = pci_resource_len(dev, 5);
        rmmio = ioremap(rmmio_base, rmmio_size);
        if (rmmio == NULL) {
                printk(KERN_ERR "[reset_amdgpu_vega] failed to ioremap the device\n");
                ret = -ENOMEM;
                goto out;
        }
#if 0
        /* check the sign of life register to see if we even need to reset */
        if (!readl(rmmio + mmMP0_SMN_C2PMSG_81)) {
                printk(KERN_INFO "[reset_amdgpu_vega] psp is not running\n");
                ret = 0;
                goto out_unmap;
        }

        /* ensure the PSP is working */
        ret = -EINVAL;
        for(i = 0; i < AMDGPU_MAX_USEC_TIMEOUT; i++) {
                val = readl(rmmio + mmMP0_SMN_C2PMSG_64);
                if ((val & 0x8000FFFF) == 0x80000000) {
                        ret = 0;
                        break;
                }
                udelay(1);
        }
        if (ret) {
                printk(KERN_ERR "[reset_amdgpu_vega] psp is not working correctly\n");
                goto out_unmap;
        }
#endif
        /* send the mode 1 reset command */
        writel(0x70000, rmmio + mmMP0_SMN_C2PMSG_64);

        mdelay(1000);

        /* wait for the reset to complete */
        ret = -EINVAL;
        for(i = 0; i < AMDGPU_MAX_USEC_TIMEOUT; i++) {
                val = readl(rmmio + mmMP0_SMN_C2PMSG_33);
                if ((val & 0x80000000) == 0x80000000) {
                        ret = 0;
                        break;
                }
                udelay(1);
        }
        if (ret) {
                printk(KERN_ERR "[reset_amdgpu_vega] reset failed\n");
                goto out_unmap;
        }

        pcie_flr(dev);

        ret = 0;
        printk(KERN_INFO "[reset_amdgpu_vega] reset success\n");

out_unmap:
        iounmap(rmmio);
out:
        pci_restore_state(dev);
        return ret;
}