Subject: [PATCH 34/42] PCI: aardvark: Add support for DEVCAP2, DEVCTL2, LNKCAP2 and LNKCTL2 registers on emulated bridge

From: Pali Rohár <[email-masked]>
Date: Thu, 6 May 2021 17:31:45 +0200

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.

Signed-off-by: Pali Rohár <[email-masked]>
Reviewed-by: Marek Behún <[email-masked]>
Fixes: 8a3ebd8de328 ("PCI: aardvark: Implement emulated root PCI bridge config space")
---
 drivers/pci/controller/pci-aardvark.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
index e724d05a61a8..13bbc0b5134d 100644
--- a/drivers/pci/controller/pci-aardvark.c
+++ b/drivers/pci/controller/pci-aardvark.c
@@ -610,8 +610,13 @@ advk_pci_bridge_emul_pcie_conf_read(struct pci_bridge_emul *bridge,
 	case PCI_EXP_DEVCAP:
 	case PCI_EXP_DEVCTL:
 	case PCI_EXP_LNKCAP:
+	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;
 	}
@@ -631,16 +636,18 @@ advk_pci_bridge_emul_pcie_conf_write(struct pci_bridge_emul *bridge,
 	 */
 
 	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)
 			advk_pcie_wait_for_retrain(pcie);
 		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;
 	}
-- 
2.20.1

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