/**
* genwqe_pci_fundamental_reset() - trigger a PCIe fundamental reset on the slot
*
* Note: pci_set_pcie_reset_state() is not implemented on all archs, so this
* reset method will not work in all cases.
*
* Return: 0 on success or error code from pci_set_pcie_reset_state()
*/
static int genwqe_pci_fundamental_reset(struct pci_dev *pci_dev)
{
int rc;
/*
* lock pci config space access from userspace,
* save state and issue PCIe fundamental reset
*/
pci_cfg_access_lock(pci_dev);
pci_save_state(pci_dev);
rc = pci_set_pcie_reset_state(pci_dev, pcie_warm_reset);
if (!rc) {
/* keep PCIe reset asserted for 250ms */
msleep(250);
pci_set_pcie_reset_state(pci_dev, pcie_deassert_reset);
/* Wait for 2s to reload flash and train the link */
msleep(2000);
}
pci_restore_state(pci_dev);
pci_cfg_access_unlock(pci_dev);
return rc;
}
int cxl_reset(struct cxl *adapter)
{
struct pci_dev *dev = to_pci_dev(adapter->dev.parent);
int rc;
dev_info(&dev->dev, "CXL reset\n");
/* pcie_warm_reset requests a fundamental pci reset which includes a
* PERST assert/deassert. PERST triggers a loading of the image
* if "user" or "factory" is selected in sysfs */
if ((rc = pci_set_pcie_reset_state(dev, pcie_warm_reset))) {
dev_err(&dev->dev, "cxl: pcie_warm_reset failed\n");
return rc;
}
return rc;
}
