diff options
| author | Pali Rohár <pali@kernel.org> | 2021-11-25 11:32:43 +0100 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2022-01-12 14:21:24 -0500 |
| commit | 06f25bd2a907fa543d69757da4e3c752b7103e54 (patch) | |
| tree | c52d7c31d288e83984dbc5b2490bc2eaa9efcdda | |
| parent | f2094143c5367f38c74d4233a65afb07a25a8ace (diff) | |
| download | u-boot-06f25bd2a907fa543d69757da4e3c752b7103e54.zip u-boot-06f25bd2a907fa543d69757da4e3c752b7103e54.tar.gz u-boot-06f25bd2a907fa543d69757da4e3c752b7103e54.tar.bz2 | |
pci: Disable I/O forwarding during autoconfiguration if unsupported
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>
| -rw-r--r-- | drivers/pci/pci_auto.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/pci/pci_auto.c b/drivers/pci/pci_auto.c index 7e6ee54..6e5ed19 100644 --- a/drivers/pci/pci_auto.c +++ b/drivers/pci/pci_auto.c @@ -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 */ |