sh: pci: Support ports with disabled links on SH7786 PCIe.

Presently we error out if a link is disabled and simply drop the port
registration outright. This follows the PPC changes and simply reports on
the link state on boot, leaving the port registered, in order to more
easily deal with hotplug on future parts.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

diff --git a/arch/sh/drivers/pci/pcie-sh7786.c b/arch/sh/drivers/pci/pcie-sh7786.c
index 21854eb..aacd0fc 100644 (file)
--- a/arch/sh/drivers/pci/pcie-sh7786.c
+++ b/arch/sh/drivers/pci/pcie-sh7786.c
@@ -341,9 +341,12 @@ static int pcie_init(struct sh7786_pcie_port *port)
        data |= PCIEMACCTLR_SCR_DIS | (0xff << 16);
        pci_write_reg(chan, data, SH4A_PCIEMACCTLR);
 
+       /*
+        * This will timeout if we don't have a link, but we permit the
+        * port to register anyways in order to support hotplug on future
+        * hardware.
+        */
        ret = pci_wait_for_irq(chan, MASK_INT_TX_CTRL);
-       if (unlikely(ret != 0))
-               return -ENODEV;
 
        data = pci_read_reg(chan, SH4A_PCIEPCICONF1);
        data &= ~(PCI_STATUS_DEVSEL_MASK << 16);
@@ -356,9 +359,13 @@ static int pcie_init(struct sh7786_pcie_port *port)
 
        wmb();
 
-       data = pci_read_reg(chan, SH4A_PCIEMACSR);
-       printk(KERN_NOTICE "PCI: PCIe#%d link width %d\n",
-              port->index, (data >> 20) & 0x3f);
+       if (ret == 0) {
+               data = pci_read_reg(chan, SH4A_PCIEMACSR);
+               printk(KERN_NOTICE "PCI: PCIe#%d x%d link detected\n",
+                      port->index, (data >> 20) & 0x3f);
+       } else
+               printk(KERN_NOTICE "PCI: PCIe#%d link down\n",
+                      port->index);
 
        for (i = win = 0; i < chan->nr_resources; i++) {
                struct resource *res = chan->resources + i;