openwrt/target/linux/generic/backport-5.15/850-v5.17-0003-PCI-aardvark-Add-support-for-DEVCAP2-DEVCTL2-LNKCAP2.patch

From 1d3e170344dff2cef8827db6c09909b78cbc11d7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
Date: Tue, 30 Nov 2021 18:29:05 +0100
Subject: [PATCH] PCI: aardvark: Add support for DEVCAP2, DEVCTL2, LNKCAP2 and
 LNKCTL2 registers on emulated bridge
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PCI aardvark hardware supports access to DEVCAP2, DEVCTL2, LNKCAP2 and
LNKCTL2 configuration registers of PCIe core via PCIE_CORE_PCIEXP_CAP.
Export them via emulated software root bridge.

Link: https://lore.kernel.org/r/20211130172913.9727-4-kabel@kernel.org
Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Marek Behún <kabel@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
---
 drivers/pci/controller/pci-aardvark.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

--- a/drivers/pci/controller/pci-aardvark.c
+++ b/drivers/pci/controller/pci-aardvark.c
@@ -876,8 +876,13 @@ advk_pci_bridge_emul_pcie_conf_read(stru
 
 	case PCI_EXP_DEVCAP:
 	case PCI_EXP_DEVCTL:
+	case PCI_EXP_DEVCAP2:
+	case PCI_EXP_DEVCTL2:
+	case PCI_EXP_LNKCAP2:
+	case PCI_EXP_LNKCTL2:
 		*value = advk_readl(pcie, PCIE_CORE_PCIEXP_CAP + reg);
 		return PCI_BRIDGE_EMUL_HANDLED;
+
 	default:
 		return PCI_BRIDGE_EMUL_NOT_HANDLED;
 	}
@@ -891,10 +896,6 @@ advk_pci_bridge_emul_pcie_conf_write(str
 	struct advk_pcie *pcie = bridge->data;
 
 	switch (reg) {
-	case PCI_EXP_DEVCTL:
-		advk_writel(pcie, new, PCIE_CORE_PCIEXP_CAP + reg);
-		break;
-
 	case PCI_EXP_LNKCTL:
 		advk_writel(pcie, new, PCIE_CORE_PCIEXP_CAP + reg);
 		if (new & PCI_EXP_LNKCTL_RL)
@@ -916,6 +917,12 @@ advk_pci_bridge_emul_pcie_conf_write(str
 		advk_writel(pcie, new, PCIE_ISR0_REG);
 		break;
 
+	case PCI_EXP_DEVCTL:
+	case PCI_EXP_DEVCTL2:
+	case PCI_EXP_LNKCTL2:
+		advk_writel(pcie, new, PCIE_CORE_PCIEXP_CAP + reg);
+		break;
+
 	default:
 		break;
 	}