The blamed commit simplifies code, by using the for_each_of_range()
iterator. But it results in no pci devices being detected anymore on
Turris Omnia (and probably other mvebu targets).
Issue #1:
To determine range.flags, of_pci_range_parser_one() uses bus->get_flags(),
which resolves to of_bus_pci_get_flags(). That function already returns an
IORESOURCE bit field, and NOT the original flags from the "ranges"
resource.
Then mvebu_get_tgt_attr() attempts the very same conversion again.
But this is a misinterpretation of range.flags.
Remove the misinterpretation of range.flags in mvebu_get_tgt_attr(),
to restore the intended behavior.
Issue #2:
The driver needs target and attributes, which are encoded in the raw
address values of the "/soc/pcie/ranges" resource. According to
of_pci_range_parser_one(), the raw values are stored in range.bus_addr
and range.parent_bus_addr, respectively. range.cpu_addr is a translated
version of range.parent_bus_addr, and not relevant here.
Use the correct range structure member, to extract target and attributes.
This restores the intended behavior.
Signed-off-by: Klaus Kudielka <klaus.kudielka@xxxxxxxxx>
Fixes: 5da3d94a23c6 ("PCI: mvebu: Use for_each_of_range() iterator for parsing "ranges"")
Reported-by: Bjorn Helgaas <helgaas@xxxxxxxxxx>
Closes: https://lore.kernel.org/r/20250820184603.GA633069@bhelgaas/
Reported-by: Jan Palus <jpalus@xxxxxxxxxxxx>
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=220479
---
v2: Fix issue #2, as well.
drivers/pci/controller/pci-mvebu.c | 21 ++++-----------------
1 file changed, 4 insertions(+), 17 deletions(-)
diff --git a/drivers/pci/controller/pci-mvebu.c b/drivers/pci/controller/pci-mvebu.c
index 755651f338..a72aa57591 100644
--- a/drivers/pci/controller/pci-mvebu.c
+++ b/drivers/pci/controller/pci-mvebu.c
@@ -1168,12 +1168,6 @@ static void __iomem *mvebu_pcie_map_registers(struct platform_device *pdev,
return devm_ioremap_resource(&pdev->dev, &port->regs);
}
-#define DT_FLAGS_TO_TYPE(flags) (((flags) >> 24) & 0x03)
-#define DT_TYPE_IO 0x1
-#define DT_TYPE_MEM32 0x2
-#define DT_CPUADDR_TO_TARGET(cpuaddr) (((cpuaddr) >> 56) & 0xFF)
-#define DT_CPUADDR_TO_ATTR(cpuaddr) (((cpuaddr) >> 48) & 0xFF)
-
static int mvebu_get_tgt_attr(struct device_node *np, int devfn,
unsigned long type,
unsigned int *tgt,
@@ -1189,19 +1183,12 @@ static int mvebu_get_tgt_attr(struct device_node *np, int devfn,
return -EINVAL;
for_each_of_range(&parser, &range) {
- unsigned long rtype;
u32 slot = upper_32_bits(range.bus_addr);
- if (DT_FLAGS_TO_TYPE(range.flags) == DT_TYPE_IO)
- rtype = IORESOURCE_IO;
- else if (DT_FLAGS_TO_TYPE(range.flags) == DT_TYPE_MEM32)
- rtype = IORESOURCE_MEM;
- else
- continue;
-
- if (slot == PCI_SLOT(devfn) && type == rtype) {
- *tgt = DT_CPUADDR_TO_TARGET(range.cpu_addr);
- *attr = DT_CPUADDR_TO_ATTR(range.cpu_addr);
+ if (slot == PCI_SLOT(devfn) &&
+ type == (range.flags & IORESOURCE_TYPE_BITS)) {
+ *tgt = (range.parent_bus_addr >> 56) & 0xFF;
+ *attr = (range.parent_bus_addr >> 48) & 0xFF;
return 0;
}
}
--
2.50.1
