Subject: [PATCH 06/42] PCI: aardvark: Fix reporting CRS Software Visibility on emulated bridge

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

CRS Software Visibility is supported and always enabled by PIO.
Correctly report this information via emulated 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")
Cc: [email-masked]
---
 drivers/pci/controller/pci-aardvark.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
index 3f3c72927afb..e297ec9ec390 100644
--- a/drivers/pci/controller/pci-aardvark.c
+++ b/drivers/pci/controller/pci-aardvark.c
@@ -578,6 +578,8 @@ advk_pci_bridge_emul_pcie_conf_read(struct pci_bridge_emul *bridge,
 	case PCI_EXP_RTCTL: {
 		u32 val = advk_readl(pcie, PCIE_ISR0_MASK_REG);
 		*value = (val & PCIE_MSG_PM_PME_MASK) ? 0 : PCI_EXP_RTCTL_PMEIE;
+		*value |= PCI_EXP_RTCTL_CRSSVE;
+		*value |= PCI_EXP_RTCAP_CRSVIS << 16;
 		return PCI_BRIDGE_EMUL_HANDLED;
 	}
 
@@ -659,6 +661,7 @@ static struct pci_bridge_emul_ops advk_pci_bridge_emul_ops = {
 static int advk_sw_pci_bridge_init(struct advk_pcie *pcie)
 {
 	struct pci_bridge_emul *bridge = &pcie->bridge;
+	int ret;
 
 	bridge->conf.vendor =
 		cpu_to_le16(advk_readl(pcie, PCIE_CORE_DEV_ID_REG) & 0xffff);
@@ -682,7 +685,16 @@ static int advk_sw_pci_bridge_init(struct advk_pcie *pcie)
 	bridge->data = pcie;
 	bridge->ops = &advk_pci_bridge_emul_ops;
 
-	return pci_bridge_emul_init(bridge, 0);
+	/* PCIe config space can be initialized after pci_bridge_emul_init() */
+	ret = pci_bridge_emul_init(bridge, 0);
+	if (ret < 0)
+		return ret;
+
+	/* Completion Retry Status is supported and always enabled by PIO */
+	bridge->pcie_conf.rootctl = cpu_to_le16(PCI_EXP_RTCTL_CRSSVE);
+	bridge->pcie_conf.rootcap = cpu_to_le16(PCI_EXP_RTCAP_CRSVIS);
+
+	return 0;
 }
 
 static bool advk_pcie_valid_device(struct advk_pcie *pcie, struct pci_bus *bus,
-- 
2.20.1

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