[PATCH] pci: Fix register for determining type of IO base address

Pali Rohár pali at kernel.org
Thu Nov 25 11:30:58 CET 2021

Function dm_pciauto_prescan_setup_bridge() configures base address
registers, therefore it should read type of IO from base address registers
(and not from limit address registers).

Note that base and limit address registers should have same type, so this
change is just usage correction and has no functional change on correctly
working hardware.

Fixes: 8e85f36a8fab ("pci: Fix configuring io/memory base and limit registers of PCI bridges")
Signed-off-by: Pali Rohár <pali at kernel.org>
 drivers/pci/pci_auto.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/pci_auto.c b/drivers/pci/pci_auto.c
index 5af4ee6e56df..7e6ee54be087 100644
--- a/drivers/pci/pci_auto.c
+++ b/drivers/pci/pci_auto.c
@@ -197,7 +197,7 @@ void dm_pciauto_prescan_setup_bridge(struct udevice *dev, int sub_bus)
 	dm_pci_read_config16(dev, PCI_COMMAND, &cmdstat);
 	dm_pci_read_config16(dev, PCI_PREF_MEMORY_BASE, &prefechable_64);
 	prefechable_64 &= PCI_PREF_RANGE_TYPE_MASK;
-	dm_pci_read_config8(dev, PCI_IO_LIMIT, &io_32);
+	dm_pci_read_config8(dev, PCI_IO_BASE, &io_32);
 	/* Configure bus number registers */

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