PCI: dwc: ep: Fix resizable BAR support for multi-PF configurations

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[ Upstream commit 43d67ec26b ]

The resizable BAR support added by the commit 3a3d4cabe6 ("PCI: dwc: ep:
Allow EPF drivers to configure the size of Resizable BARs") incorrectly
configures the resizable BARs only for the first Physical Function (PF0)
in EP mode.

The resizable BAR configuration functions use generic dw_pcie_*_dbi()
operations instead of physical function specific dw_pcie_ep_*_dbi()
operations. This causes resizable BAR configuration to always target
PF0 regardless of the requested function number.

Additionally, dw_pcie_ep_init_non_sticky_registers() only initializes
resizable BAR registers for PF0, leaving other PFs unconfigured during
the execution of this function.

Fix this by using physical function specific configuration space access
operations throughout the resizable BAR code path and initializing
registers for all the physical functions that support resizable BARs.

Fixes: 3a3d4cabe6 ("PCI: dwc: ep: Allow EPF drivers to configure the size of Resizable BARs")
Signed-off-by: Aksh Garg <a-garg7@ti.com>
[mani: added stable tag]
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Niklas Cassel <cassel@kernel.org>
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260130115516.515082-2-a-garg7@ti.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

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This commit is contained in:

Aksh Garg 2026-01-30 17:25:14 +05:30 • committed by Sasha Levin

parent 7c0c4b7e84

commit c6db0f4a16

1 changed files with 32 additions and 16 deletions

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drivers/pci/controller/dwc/pcie-designware-ep.c

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