linux-kernel - [PATCH v2] PCI: dwc: rcar-gen4-ep: Mark BAR0 and BAR2 as Resizable BARs

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Message-ID: <20260210160315.2272930-1-den@valinux.co.jp>
Date: Wed, 11 Feb 2026 01:03:15 +0900
From: Koichiro Den <den@...inux.co.jp>
To: marek.vasut+renesas@...il.com,
	yoshihiro.shimoda.uh@...esas.com,
	lpieralisi@...nel.org,
	kwilczynski@...nel.org,
	mani@...nel.org,
	robh@...nel.org,
	bhelgaas@...gle.com,
	geert+renesas@...der.be,
	magnus.damm@...il.com,
	cassel@...nel.org
Cc: linux-pci@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2] PCI: dwc: rcar-gen4-ep: Mark BAR0 and BAR2 as Resizable BARs

R-Car Gen4 (S4) implements the PCIe Resizable BAR capability for BAR0 and
BAR2. Advertise them as BAR_RESIZABLE so EPF-requested BAR sizes are
reflected to the host.

Reviewed-by: Niklas Cassel <cassel@...nel.org>
Signed-off-by: Koichiro Den <den@...inux.co.jp>
---
Changes since v1:
  - Reword commit message only, no code changes.
  - Rebased onto pci/controller/dwc as of 2026-02-11

v1: https://lore.kernel.org/linux-pci/20251023072217.901888-1-den@valinux.co.jp

 drivers/pci/controller/dwc/pcie-rcar-gen4.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-rcar-gen4.c b/drivers/pci/controller/dwc/pcie-rcar-gen4.c
index a6912e85e4dd..3d4a889e38cc 100644
--- a/drivers/pci/controller/dwc/pcie-rcar-gen4.c
+++ b/drivers/pci/controller/dwc/pcie-rcar-gen4.c
@@ -422,7 +422,9 @@ static int rcar_gen4_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
 static const struct pci_epc_features rcar_gen4_pcie_epc_features = {
 	DWC_EPC_COMMON_FEATURES,
 	.msi_capable = true,
+	.bar[BAR_0] = { .type = BAR_RESIZABLE, },
 	.bar[BAR_1] = { .type = BAR_RESERVED, },
+	.bar[BAR_2] = { .type = BAR_RESIZABLE, },
 	.bar[BAR_3] = { .type = BAR_RESERVED, },
 	.bar[BAR_4] = { .type = BAR_FIXED, .fixed_size = 256 },
 	.bar[BAR_5] = { .type = BAR_RESERVED, },
-- 
2.51.0