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PCI: dwc: Use resource start as ioremap() input in dw_pcie_pme_turn_off()

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[ Upstream commit 8f4a489b370e6612700aa16b9e4373b2d85d7503 ]

The msg_res region translates writes into PCIe Message TLPs. Previously we
mapped this region using atu.cpu_addr, the input address programmed into
the ATU.

"cpu_addr" is a misnomer because when a bus fabric translates addresses
between the CPU and the ATU, the ATU input address is different from the
CPU address.  A future patch will rename "cpu_addr" and correct the value
to be the ATU input address instead of the CPU physical address.

Map the msg_res region before writing to it using the msg_res resource
start, a CPU physical address.

Link: https://lore.kernel.org/r/20250315201548.858189-2-helgaas@kernel.org
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Frank Li
2025-03-15 15:15:36 -05:00
committed by Greg Kroah-Hartman
parent e658f2d94a
commit e2520cc19b
1 changed files with 1 additions and 1 deletions
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2
drivers/pci/controller/dwc/pcie-designware-host.c
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@@ -902,7 +902,7 @@ static int dw_pcie_pme_turn_off(struct dw_pcie *pci)
if (ret)
return ret;
mem = ioremap(atu.cpu_addr, pci->region_align);
mem = ioremap(pci->pp.msg_res->start, pci->region_align);
if (!mem)
return -ENOMEM;