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PCI: dwc: rcar-gen4: Change EPC BAR alignment to 4K as per the documentation

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R-Car S4 Series (R8A779F[4-7]*) EP controller uses a 4K minimum iATU region
size (CX_ATU_MIN_REGION_SIZE = 4K) as per R19UH0161EJ0130 Rev.1.30. Also,
the controller itself can only be configured in the range 4 KB to 64 KB, so
the current 1 MB alignment requirement is incorrect.

Hence, change the alignment to the min size 4K as per the documentation.

This also fixes needless unusability of BAR4 on this platform when the
target address is fixed, such as for doorbell targets.

Fixes: e311b3834d ("PCI: rcar-gen4: Add endpoint mode support")
Signed-off-by: Koichiro Den <den@valinux.co.jp>
[mani: commit log]
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Niklas Cassel <cassel@kernel.org>
Link: https://patch.msgid.link/20260305151050.1834007-1-den@valinux.co.jp
This commit is contained in:
Koichiro Den 2026-03-06 00:10:50 +09:00 committed by Bjorn Helgaas
parent f761e0deb4
commit 13f55a7ca7
1 changed files with 1 additions and 1 deletions
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2
drivers/pci/controller/dwc/pcie-rcar-gen4.c
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@ -428,7 +428,7 @@ static const struct pci_epc_features rcar_gen4_pcie_epc_features = {
.bar[BAR_3] = { .type = BAR_RESERVED, },
.bar[BAR_4] = { .type = BAR_FIXED, .fixed_size = 256 },
.bar[BAR_5] = { .type = BAR_RESERVED, },
.align = SZ_1M,
.align = SZ_4K,
};
static const struct pci_epc_features*