linux-kernel - [PATCH v5 4/6] PCI: dwc: Add dw_pcie_host_ops.host

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Date:   Wed,  5 Jan 2022 15:43:20 +0800
From:   Richard Zhu <hongxing.zhu@....com>
To:     l.stach@...gutronix.de, bhelgaas@...gle.com, broonie@...nel.org,
        lorenzo.pieralisi@....com, jingoohan1@...il.com, festevam@...il.com
Cc:     hongxing.zhu@....com, stable@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-imx@....com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel@...gutronix.de
Subject: [PATCH v5 4/6] PCI: dwc: Add dw_pcie_host_ops.host_exit() callback

When link is never came up in the link training after host_init.
The clocks and power supplies usage counter balance should be handled
properly on some DWC platforms (for example, i.MX PCIe).

Add a new host_exit() callback into dw_pcie_host_ops, then it could be
invoked to handle the unbalance issue in the error handling after
host_init() function when link is down.

Signed-off-by: Richard Zhu <hongxing.zhu@....com>
---
 drivers/pci/controller/dwc/pcie-designware-host.c | 5 ++++-
 drivers/pci/controller/dwc/pcie-designware.h      | 1 +
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index f4755f3a03be..461863bde3c9 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -405,7 +405,7 @@ int dw_pcie_host_init(struct pcie_port *pp)
 	if (!dw_pcie_link_up(pci) && pci->ops && pci->ops->start_link) {
 		ret = pci->ops->start_link(pci);
 		if (ret)
-			goto err_free_msi;
+			goto err_host_init;
 	}
 
 	/* Ignore errors, the link may come up later */
@@ -417,6 +417,9 @@ int dw_pcie_host_init(struct pcie_port *pp)
 	if (!ret)
 		return 0;
 
+err_host_init:
+	if (pp->ops->host_exit)
+		pp->ops->host_exit(pp);
 err_free_msi:
 	if (pp->has_msi_ctrl)
 		dw_pcie_free_msi(pp);
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index 7d6e9b7576be..1153687ea9a6 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -174,6 +174,7 @@ enum dw_pcie_device_mode {
 
 struct dw_pcie_host_ops {
 	int (*host_init)(struct pcie_port *pp);
+	void (*host_exit)(struct pcie_port *pp);
 	int (*msi_host_init)(struct pcie_port *pp);
 };
 
-- 
2.25.1