linux-kernel - [PATCH v3 2/4] PCI: dwc: Pass DWC PCIe mode to dwc_pcie_debugfs

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Message-Id: <20250424-pcie-ptm-v3-2-c929ebd2821c@linaro.org>
Date: Thu, 24 Apr 2025 21:37:17 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Lorenzo Pieralisi <lpieralisi@...nel.org>, 
 Krzysztof Wilczyński <kw@...ux.com>, 
 Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>, 
 Jingoo Han <jingoohan1@...il.com>
Cc: linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-arm-msm@...r.kernel.org, 
 Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Subject: [PATCH v3 2/4] PCI: dwc: Pass DWC PCIe mode to
 dwc_pcie_debugfs_init()

Upcoming PTM debugfs interface relies on the DWC PCIe mode to expose the
relevat debugfs attributes to userspace. So pass the mode to
dwc_pcie_debugfs_init() API from host and ep drivers and save it in
'struct dw_pcie::mode'.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
---
 drivers/pci/controller/dwc/pcie-designware-debugfs.c | 4 +++-
 drivers/pci/controller/dwc/pcie-designware-ep.c      | 2 +-
 drivers/pci/controller/dwc/pcie-designware-host.c    | 2 +-
 drivers/pci/controller/dwc/pcie-designware.h         | 6 ++++--
 4 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-designware-debugfs.c b/drivers/pci/controller/dwc/pcie-designware-debugfs.c
index 9e6f4d00f26298077c976c9e74d8616544f20ddb..896c387450ca45d979f6baa04e6b3ae3e4be167e 100644
--- a/drivers/pci/controller/dwc/pcie-designware-debugfs.c
+++ b/drivers/pci/controller/dwc/pcie-designware-debugfs.c
@@ -651,7 +651,7 @@ void dwc_pcie_debugfs_deinit(struct dw_pcie *pci)
 	debugfs_remove_recursive(pci->debugfs->debug_dir);
 }
 
-void dwc_pcie_debugfs_init(struct dw_pcie *pci)
+void dwc_pcie_debugfs_init(struct dw_pcie *pci, enum dw_pcie_device_mode mode)
 {
 	char dirname[DWC_DEBUGFS_BUF_MAX];
 	struct device *dev = pci->dev;
@@ -674,4 +674,6 @@ void dwc_pcie_debugfs_init(struct dw_pcie *pci)
 			err);
 
 	dwc_pcie_ltssm_debugfs_init(pci, dir);
+
+	pci->mode = mode;
 }
diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
index 1a0bf9341542eabc4d28070e3a2d6a8b0b444578..6ee14694372c70783c83c2c7483310f4cbfda078 100644
--- a/drivers/pci/controller/dwc/pcie-designware-ep.c
+++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
@@ -1013,7 +1013,7 @@ int dw_pcie_ep_init_registers(struct dw_pcie_ep *ep)
 
 	dw_pcie_ep_init_non_sticky_registers(pci);
 
-	dwc_pcie_debugfs_init(pci);
+	dwc_pcie_debugfs_init(pci, DW_PCIE_EP_TYPE);
 
 	return 0;
 
diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index ecc33f6789e32cd022a5e5fb487bdec5d7759880..17c78a3346512bef8319af2ff7b8c412d41394a5 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -567,7 +567,7 @@ int dw_pcie_host_init(struct dw_pcie_rp *pp)
 	if (pp->ops->post_init)
 		pp->ops->post_init(pp);
 
-	dwc_pcie_debugfs_init(pci);
+	dwc_pcie_debugfs_init(pci, DW_PCIE_RC_TYPE);
 
 	return 0;
 
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index 56aafdbcdacaff6b738800fb03ae60eb13c9a0f2..7f58c94b5b1e9a590692474d5efa80c5b5ed9b8d 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -503,6 +503,7 @@ struct dw_pcie {
 	struct gpio_desc		*pe_rst;
 	bool			suspended;
 	struct debugfs_info	*debugfs;
+	enum			dw_pcie_device_mode mode;
 
 	/*
 	 * If iATU input addresses are offset from CPU physical addresses,
@@ -871,10 +872,11 @@ dw_pcie_ep_get_func_from_ep(struct dw_pcie_ep *ep, u8 func_no)
 #endif
 
 #ifdef CONFIG_PCIE_DW_DEBUGFS
-void dwc_pcie_debugfs_init(struct dw_pcie *pci);
+void dwc_pcie_debugfs_init(struct dw_pcie *pci, enum dw_pcie_device_mode mode);
 void dwc_pcie_debugfs_deinit(struct dw_pcie *pci);
 #else
-static inline void dwc_pcie_debugfs_init(struct dw_pcie *pci)
+static inline void dwc_pcie_debugfs_init(struct dw_pcie *pci,
+					 enum dw_pcie_device_mode mode)
 {
 }
 static inline void dwc_pcie_debugfs_deinit(struct dw_pcie *pci)

-- 
2.43.0