linux-kernel - [PATCH 01/10] PCI: save pci_bus pointer in pcie

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Date:   Tue, 26 Mar 2019 20:43:18 +0530
From:   Vidya Sagar <vidyas@...dia.com>
To:     <bhelgaas@...gle.com>, <robh+dt@...nel.org>,
        <mark.rutland@....com>, <thierry.reding@...il.com>,
        <jonathanh@...dia.com>, <kishon@...com>, <catalin.marinas@....com>,
        <will.deacon@....com>, <lorenzo.pieralisi@....com>,
        <jingoohan1@...il.com>, <gustavo.pimentel@...opsys.com>,
        <mperttunen@...dia.com>, <vidyas@...dia.com>, <tiwai@...e.de>,
        <spujar@...dia.com>, <skomatineni@...dia.com>,
        <liviu.dudau@....com>, <krzk@...nel.org>, <heiko@...ech.de>,
        <horms+renesas@...ge.net.au>, <olof@...om.net>,
        <maxime.ripard@...tlin.com>, <andy.gross@...aro.org>,
        <bjorn.andersson@...aro.org>, <jagan@...rulasolutions.com>,
        <enric.balletbo@...labora.com>, <ezequiel@...labora.com>,
        <stefan.wahren@...e.com>, <marc.w.gonzalez@...e.fr>,
        <l.stach@...gutronix.de>, <tpiepho@...inj.com>,
        <hayashi.kunihiko@...ionext.com>, <yue.wang@...ogic.com>,
        <shawn.lin@...k-chips.com>, <xiaowei.bao@....com>
CC:     <linux-pci@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <kthota@...dia.com>,
        <mmaddireddy@...dia.com>
Subject: [PATCH 01/10] PCI: save pci_bus pointer in pcie_port structure

save pci_bus pointer created by PCIe sub-system's
pci_scan_root_bus_bridge() to be used by host controller drivers for post
processing. Tegra host controller driver needs it for the following
reasons
- to derive pci_host_bridge structure from pci_bus which is used to
configure iATU's outbound regions for different windows accesses
- to traverse and configure downstream hierarchy. One such case is,
configuring all immediate downstream devices to D0 state before transiting
link to L2 state. Saving pci_bus pointer seems the best method compared to
deriving it by other means.

Signed-off-by: Vidya Sagar <vidyas@...dia.com>
---
 drivers/pci/controller/dwc/pcie-designware-host.c | 1 +
 drivers/pci/controller/dwc/pcie-designware.h      | 1 +
 2 files changed, 2 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index 25087d3c9a82..15add3cf3945 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -494,6 +494,7 @@ int dw_pcie_host_init(struct pcie_port *pp)
 		goto error;
 
 	bus = bridge->bus;
+	pp->bus = bus;
 
 	if (pp->ops->scan_bus)
 		pp->ops->scan_bus(pp);
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index 377f4c0b52da..70007276bc93 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -175,6 +175,7 @@ struct pcie_port {
 	struct resource		*busn;
 	int			irq;
 	const struct dw_pcie_host_ops *ops;
+	struct pci_bus		*bus;
 	int			msi_irq;
 	struct irq_domain	*irq_domain;
 	struct irq_domain	*msi_domain;
-- 
2.7.4