From 52e2b0f16574afd082cff0f0e8567b2d9f68c033 Mon Sep 17 00:00:00 2001
From: Tyrel Datwyler <tyreld@linux.ibm.com>
Date: Sun, 10 Nov 2019 23:21:32 -0600
Subject: [PATCH] PCI: rpaphp: Don't rely on firmware feature to imply drc-info
support
References: FATE#326955 bsc#1157480 ltc#181028
Patch-mainline: v5.5-rc1
Git-commit: 52e2b0f16574afd082cff0f0e8567b2d9f68c033
In the event that the partition is migrated to a platform with older
firmware that doesn't support the ibm,drc-info property the device
tree is modified to remove the ibm,drc-info property and replace it
with the older style ibm,drc-* properties for types, names, indexes,
and power-domains. One of the requirements of the drc-info firmware
feature is that the client is able to handle both the new property,
and old style properties at runtime. Therefore we can't rely on the
firmware feature alone to dictate which property is currently
present in the device tree.
Fix this short coming by checking explicitly for the ibm,drc-info
property, and falling back to the older ibm,drc-* properties if it
doesn't exist.
Signed-off-by: Tyrel Datwyler <tyreld@linux.ibm.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/1573449697-5448-6-git-send-email-tyreld@linux.ibm.com
Acked-by: Michal Suchanek <msuchanek@suse.de>
---
drivers/pci/hotplug/rpaphp_core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/pci/hotplug/rpaphp_core.c b/drivers/pci/hotplug/rpaphp_core.c
index e3502644a45c..e18e9a0e959c 100644
--- a/drivers/pci/hotplug/rpaphp_core.c
+++ b/drivers/pci/hotplug/rpaphp_core.c
@@ -275,7 +275,7 @@ int rpaphp_check_drc_props(struct device_node *dn, char *drc_name,
return -EINVAL;
}
- if (firmware_has_feature(FW_FEATURE_DRC_INFO))
+ if (of_find_property(dn->parent, "ibm,drc-info", NULL))
return rpaphp_check_drc_props_v2(dn, drc_name, drc_type,
*my_index);
else
--
2.23.0