On 19.01.2016 17:02, Lorenzo Pieralisi wrote:
On Wed, Jan 13, 2016 at 02:20:57PM +0100, Tomasz Nowicki wrote:
[...]
device via pci_create_root_bus parameter (as the ACPI device type)
I do not understand what you mean by "as the ACPI device type".
See below.
and using ACPI_COMPANION_SET in core code for ACPI boot method.
ACPI_COMPANION_SET is safe to run for all cases DT, ACPI and DT&ACPI.
Suggested-by: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
Signed-off-by: Tomasz Nowicki <tn@xxxxxxxxxxxx>
---
drivers/acpi/pci_root.c | 5 ++++-
drivers/pci/probe.c | 2 ++
2 files changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index ae3fe4e..a65c8c2 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -846,7 +846,10 @@ struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root,
pci_acpi_root_add_resources(info);
pci_add_resource(&info->resources, &root->secondary);
- bus = pci_create_root_bus(NULL, busnum, ops->pci_ops,
+
+ /* Root bridge device needs to be sure of parent ACPI type */
+ ACPI_COMPANION_SET(&device->dev, device);
I do not understand why the code above is needed, can you elaborate
please ?
This makes sure that device->dev can be identified as ACPI device, so we
can use to_acpi_device_node() and assign companion safely below.
+ bus = pci_create_root_bus(&device->dev, busnum, ops->pci_ops,
sysdata, &info->resources);
if (!bus)
goto out_release_info;
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 553a029..cad836f 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -2107,6 +2107,8 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
bridge->dev.parent = parent;
bridge->dev.release = pci_release_host_bridge_dev;
dev_set_name(&bridge->dev, "pci%04x:%02x", pci_domain_nr(b), bus);
+ ACPI_COMPANION_SET(&bridge->dev,
+ parent ? to_acpi_device_node(parent->fwnode) : NULL);
pci_create_root_bus() can be called with DT device, then
ACPI_COMPANION_SET assign no companion to bridge device.
Thanks,
Tomasz
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