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Commit dd193929 authored by Jisheng Zhang's avatar Jisheng Zhang Committed by Bjorn Helgaas
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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: default avatarJisheng Zhang <jszhang@marvell.com>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
parent 92e963f5

drivers/pci/host/pcie-designware.c

+5 −0
Original line number Diff line number Diff line
@@ -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,