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| author | Jisheng Zhang <jszhang@marvell.com> | 2016-01-07 07:12:38 +0100 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2016-02-09 19:38:51 +0100 |
| commit | dd193929d91e1b44b90f81509feeff10c94ddc4d (patch) | |
| tree | c0bacadae9b24950f18968d7cc646524e6e7c9e3 /drivers | |
| parent | Linux 4.5-rc1 (diff) | |
| download | linux-dd193929d91e1b44b90f81509feeff10c94ddc4d.tar.xz linux-dd193929d91e1b44b90f81509feeff10c94ddc4d.zip | |
PCI: designware: Explain why we don't program ATU for some platforms
Some platforms don't support ATU, e.g., pci-keystone.c. These platforms
use their own address translation component rather than ATU, and they
provide the rd_other_conf and wr_other_conf methods to program the
translation component and perform the access.
Add a comment to explain why we don't program the ATU for these platforms.
[bhelgaas: changelog]
Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/pci/host/pcie-designware.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c index 21716827847a..8bcaed18f0dd 100644 --- a/drivers/pci/host/pcie-designware.c +++ b/drivers/pci/host/pcie-designware.c @@ -517,6 +517,11 @@ int dw_pcie_host_init(struct pcie_port *pp) if (pp->ops->host_init) pp->ops->host_init(pp); + /* + * If the platform provides ->rd_other_conf, it means the platform + * uses its own address translation component rather than ATU, so + * we should not program the ATU here. + */ if (!pp->ops->rd_other_conf) dw_pcie_prog_outbound_atu(pp, PCIE_ATU_REGION_INDEX1, PCIE_ATU_TYPE_MEM, pp->mem_base, |