@@ -674,10 +674,33 @@ int __init pcibios_init(void)
continue;
}
- ret = gxio_trio_force_rc_link_up(trio_context, mac);
- if (ret < 0)
- pr_err("PCI: PCIE_FORCE_LINK_UP failure, "
- "MAC %d on TRIO %d\n", mac, trio_index);
+ /*
+ * Check for PCIe link-up status to decide if we need
+ * to force the link to come up.
+ */
+ reg_offset =
+ (TRIO_PCIE_INTFC_PORT_STATUS <<
+ TRIO_CFG_REGION_ADDR__REG_SHIFT) |
+ (TRIO_CFG_REGION_ADDR__INTFC_VAL_MAC_INTERFACE <<
+ TRIO_CFG_REGION_ADDR__INTFC_SHIFT) |
+ (mac << TRIO_CFG_REGION_ADDR__MAC_SEL_SHIFT);
+
+ port_status.word =
+ __gxio_mmio_read(trio_context->mmio_base_mac +
+ reg_offset);
+ if (!port_status.dl_up) {
+ if (rc_delay[trio_index][mac]) {
+ pr_info("Delaying PCIe RC TRIO init %d sec"
+ " on MAC %d on TRIO %d\n",
+ rc_delay[trio_index][mac], mac,
+ trio_index);
+ msleep(rc_delay[trio_index][mac] * 1000);
+ }
+ ret = gxio_trio_force_rc_link_up(trio_context, mac);
+ if (ret < 0)
+ pr_err("PCI: PCIE_FORCE_LINK_UP failure, "
+ "MAC %d on TRIO %d\n", mac, trio_index);
+ }
pr_info("PCI: Found PCI controller #%d on TRIO %d MAC %d\n", i,
trio_index, controller->mac);
@@ -700,16 +723,8 @@ int __init pcibios_init(void)
}
/*
- * Check for PCIe link-up status.
+ * Check for PCIe link-up status again.
*/
-
- reg_offset =
- (TRIO_PCIE_INTFC_PORT_STATUS <<
- TRIO_CFG_REGION_ADDR__REG_SHIFT) |
- (TRIO_CFG_REGION_ADDR__INTFC_VAL_MAC_INTERFACE <<
- TRIO_CFG_REGION_ADDR__INTFC_SHIFT ) |
- (mac << TRIO_CFG_REGION_ADDR__MAC_SEL_SHIFT);
-
port_status.word =
__gxio_mmio_read(trio_context->mmio_base_mac +
reg_offset);
If we are rebooting (e.g. via kexec) then the PCI RC link may already be up. In that case, we don't want to do the software fixup to force the link up, since that can degrade it to Gen1. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com> --- arch/tile/kernel/pci_gx.c | 41 ++++++++++++++++++++++++++++------------- 1 file changed, 28 insertions(+), 13 deletions(-)