1 files changed, 28 insertions, 2 deletions

diff --git a/drivers/misc/cxl/pci.c b/drivers/misc/cxl/pci.c
index 02c85160bfe9..85761d7eb333 100644
--- a/drivers/misc/cxl/pci.c
+++ b/drivers/misc/cxl/pci.c
@@ -1035,6 +1035,32 @@ static int cxl_read_vsec(struct cxl *adapter, struct pci_dev *dev)
         return 0;
 }
 
+/*
+ * Workaround a PCIe Host Bridge defect on some cards, that can cause
+ * malformed Transaction Layer Packet (TLP) errors to be erroneously
+ * reported. Mask this error in the Uncorrectable Error Mask Register.
+ *
+ * The upper nibble of the PSL revision is used to distinguish between
+ * different cards. The affected ones have it set to 0.
+ */
+static void cxl_fixup_malformed_tlp(struct cxl *adapter, struct pci_dev *dev)
+{
+        int aer;
+        u32 data;
+
+        if (adapter->psl_rev & 0xf000)
+                return;
+        if (!(aer = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR)))
+                return;
+        pci_read_config_dword(dev, aer + PCI_ERR_UNCOR_MASK, &data);
+        if (data & PCI_ERR_UNC_MALF_TLP)
+                if (data & PCI_ERR_UNC_INTN)
+                        return;
+        data |= PCI_ERR_UNC_MALF_TLP;
+        data |= PCI_ERR_UNC_INTN;
+        pci_write_config_dword(dev, aer + PCI_ERR_UNCOR_MASK, data);
+}
+
 static int cxl_vsec_looks_ok(struct cxl *adapter, struct pci_dev *dev)
 {
         if (adapter->vsec_status & CXL_STATUS_SECOND_PORT)
@@ -1134,6 +1160,8 @@ static int cxl_configure_adapter(struct cxl *adapter, struct pci_dev *dev)
         if ((rc = cxl_vsec_looks_ok(adapter, dev)))
                 return rc;
 
+        cxl_fixup_malformed_tlp(adapter, dev);
+
         if ((rc = setup_cxl_bars(dev)))
                 return rc;
 
@@ -1249,8 +1277,6 @@ static int cxl_probe(struct pci_dev *dev, const struct pci_device_id *id)
         int slice;
         int rc;
 
-        pci_dev_get(dev);
-
         if (cxl_verbose)
                 dump_cxl_config_space(dev);