linux-kernel - [PATCH] PCI: rcar-gen4: set ep BAR4 fixed size

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Message-Id: <20250328-rcar-gen4-bar4-v1-1-10bb6ce9ee7f@baylibre.com>
Date: Fri, 28 Mar 2025 15:30:44 +0100
From: Jerome Brunet <jbrunet@...libre.com>
To: Marek Vasut <marek.vasut+renesas@...il.com>, 
 Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>, 
 Lorenzo Pieralisi <lpieralisi@...nel.org>, 
 Krzysztof Wilczyński <kw@...ux.com>, 
 Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>, 
 Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>, 
 Serge Semin <fancer.lancer@...il.com>
Cc: Krzysztof Wilczyński <kwilczynski@...nel.org>, 
 linux-pci@...r.kernel.org, linux-renesas-soc@...r.kernel.org, 
 linux-kernel@...r.kernel.org, 
 Yuya Hamamachi <yuya.hamamachi.sx@...esas.com>, 
 Jerome Brunet <jbrunet@...libre.com>
Subject: [PATCH] PCI: rcar-gen4: set ep BAR4 fixed size

On rcar-gen4, the ep BAR4 has a fixed size of 256B.
Document this constraint in the epc features of the platform.

Fixes: e311b3834dfa ("PCI: rcar-gen4: Add endpoint mode support")
Signed-off-by: Jerome Brunet <jbrunet@...libre.com>
---
This was tested on rcar-gen4 r8a779f0-spider device.
---
 drivers/pci/controller/dwc/pcie-rcar-gen4.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/pci/controller/dwc/pcie-rcar-gen4.c b/drivers/pci/controller/dwc/pcie-rcar-gen4.c
index fc872dd35029c083da58144dce23cd1ce80f9374..02638ec442e7012d61dfad70016077d9becf56a6 100644
--- a/drivers/pci/controller/dwc/pcie-rcar-gen4.c
+++ b/drivers/pci/controller/dwc/pcie-rcar-gen4.c
@@ -403,6 +403,7 @@ static const struct pci_epc_features rcar_gen4_pcie_epc_features = {
 	.msix_capable = false,
 	.bar[BAR_1] = { .type = BAR_RESERVED, },
 	.bar[BAR_3] = { .type = BAR_RESERVED, },
+	.bar[BAR_4] = { .type = BAR_FIXED, .fixed_size = 256 },
 	.bar[BAR_5] = { .type = BAR_RESERVED, },
 	.align = SZ_1M,
 };

---
base-commit: dea140198b846f7432d78566b7b0b83979c72c2b
change-id: 20250328-rcar-gen4-bar4-dccd1347fe38

Best regards,
-- 
Jerome