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pci: Disable I/O forwarding during autoconfiguration if unsupported

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If U-Boot does not have any I/O resource for assignment then disable I/O
forwarding in PCI bridge autoconfiguration code. Default initial state of
PCI bridge IO registers is unspecified, therefore they can be in enabled if
U-Boot does not touch them.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Stefan Roese <sr@denx.de>
This commit is contained in:
Pali Rohár
2021-11-25 11:32:43 +01:00
committed by Tom Rini
parent f2094143c5
commit 06f25bd2a9
1 changed files with 8 additions and 0 deletions
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8
drivers/pci/pci_auto.c
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@@ -265,6 +265,14 @@ void dm_pciauto_prescan_setup_bridge(struct udevice *dev, int sub_bus)
(pci_io->bus_lower & 0xffff0000) >> 16);
cmdstat |= PCI_COMMAND_IO;
} else {
/* Disable I/O if unsupported */
dm_pci_write_config8(dev, PCI_IO_BASE, 0xf0 | io_32);
dm_pci_write_config8(dev, PCI_IO_LIMIT, 0x0 | io_32);
if (io_32 == PCI_IO_RANGE_TYPE_32) {
dm_pci_write_config16(dev, PCI_IO_BASE_UPPER16, 0x0);
dm_pci_write_config16(dev, PCI_IO_LIMIT_UPPER16, 0x0);
}
}
/* Enable memory and I/O accesses, enable bus master */