35 lines
1.3 KiB
Diff
35 lines
1.3 KiB
Diff
|
From 481b1bc4ce0d58107887558342e50d6323a9601d Mon Sep 17 00:00:00 2001
|
||
|
|
From: Jisheng Zhang <jszhang@marvell.com>
|
||
|
|
Date: Thu, 7 Jan 2016 14:12:38 +0800
|
||
|
|
Subject: [PATCH 54/70] 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>
|
||
|
|
---
|
||
|
|
drivers/pci/host/pcie-designware.c | 5 +++++
|
||
|
|
1 file changed, 5 insertions(+)
|
||
|
|
|
||
|
|
--- 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 *
|
||
|
|
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,
|