diff options
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/host/pci-thunder-pem.c | 25 |
1 files changed, 20 insertions, 5 deletions
diff --git a/drivers/pci/host/pci-thunder-pem.c b/drivers/pci/host/pci-thunder-pem.c index af722eb0ca75..52b5bdccf5f0 100644 --- a/drivers/pci/host/pci-thunder-pem.c +++ b/drivers/pci/host/pci-thunder-pem.c @@ -36,7 +36,7 @@ struct thunder_pem_pci { static int thunder_pem_bridge_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *val) { - u64 read_val; + u64 read_val, tmp_val; struct pci_config_window *cfg = bus->sysdata; struct thunder_pem_pci *pem_pci = (struct thunder_pem_pci *)cfg->priv; @@ -65,13 +65,28 @@ static int thunder_pem_bridge_read(struct pci_bus *bus, unsigned int devfn, read_val |= 0x00007000; /* Skip MSI CAP */ break; case 0x70: /* Express Cap */ - /* PME interrupt on vector 2*/ - read_val |= (2u << 25); + /* + * Change PME interrupt to vector 2 on T88 where it + * reads as 0, else leave it alone. + */ + if (!(read_val & (0x1f << 25))) + read_val |= (2u << 25); break; case 0xb0: /* MSI-X Cap */ - /* TableSize=4, Next Cap is EA */ + /* TableSize=2 or 4, Next Cap is EA */ read_val &= 0xc00000ff; - read_val |= 0x0003bc00; + /* + * If Express Cap(0x70) raw PME vector reads as 0 we are on + * T88 and TableSize is reported as 4, else TableSize + * is 2. + */ + writeq(0x70, pem_pci->pem_reg_base + PEM_CFG_RD); + tmp_val = readq(pem_pci->pem_reg_base + PEM_CFG_RD); + tmp_val >>= 32; + if (!(tmp_val & (0x1f << 25))) + read_val |= 0x0003bc00; + else + read_val |= 0x0001bc00; break; case 0xb4: /* Table offset=0, BIR=0 */ |