openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

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>
This commit is contained in:
Jisheng Zhang 2016-01-07 14:12:38 +08:00 committed by Bjorn Helgaas
parent 92e963f50f
commit dd193929d9
1 changed files with 5 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/pci/host/pcie-designware.c
View File

@ -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,