[PATCH v2 00/16] PCI: dwc: Another round of clean-ups

[PATCH v2 00/16] PCI: dwc: Another round of clean-ups

[Rob Herring]

Here's another batch of DWC PCI host refactoring. This series primarily
moves more of the MSI, link up, and resource handling to the core
code. Beyond a couple of minor fixes, new in this version is runtime
detection of iATU regions instead of using DT properties.

No doubt I've probably broken something. Please test. I've run this thru
kernelci and checked boards with DWC PCI which currently is just
Layerscape boards (hint: add boards and/or enable PCI). A git branch is
here[1].

This is dependent on "PCI: dwc: Restore ATU memory resource setup to use
last entry" which will be in v5.10-rc3.

Rob

[1] git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git pci-more-dwc-cleanup

Rob Herring (16):
  PCI: dwc: Support multiple ATU memory regions
  PCI: dwc/intel-gw: Move ATU offset out of driver match data
  PCI: dwc: Move "dbi", "dbi2", and "addr_space" resource setup into
    common code
  PCI: dwc/intel-gw: Remove some unneeded function wrappers
  PCI: dwc: Ensure all outbound ATU windows are reset
  PCI: dwc/dra7xx: Use the common MSI irq_chip
  PCI: dwc: Drop the .set_num_vectors() host op
  PCI: dwc: Move MSI interrupt setup into DWC common code
  PCI: dwc: Rework MSI initialization
  PCI: dwc: Move link handling into common code
  PCI: dwc: Move dw_pcie_msi_init() into core
  PCI: dwc: Move dw_pcie_setup_rc() to DWC common code
  PCI: dwc: Remove unnecessary wrappers around dw_pcie_host_init()
  Revert "PCI: dwc/keystone: Drop duplicated 'num-viewport'"
  PCI: dwc: Move inbound and outbound windows to common struct
  PCI: dwc: Detect number of iATU windows

 drivers/pci/controller/dwc/pci-dra7xx.c       | 141 +-----------------
 drivers/pci/controller/dwc/pci-exynos.c       |  50 ++-----
 drivers/pci/controller/dwc/pci-imx6.c         |  39 +----
 drivers/pci/controller/dwc/pci-keystone.c     |  79 ++--------
 .../pci/controller/dwc/pci-layerscape-ep.c    |  37 +----
 drivers/pci/controller/dwc/pci-layerscape.c   |  67 +--------
 drivers/pci/controller/dwc/pci-meson.c        |  53 ++-----
 drivers/pci/controller/dwc/pcie-al.c          |  29 +---
 drivers/pci/controller/dwc/pcie-armada8k.c    |  37 ++---
 drivers/pci/controller/dwc/pcie-artpec6.c     |  76 +---------
 .../pci/controller/dwc/pcie-designware-ep.c   |  58 +++----
 .../pci/controller/dwc/pcie-designware-host.c | 139 ++++++++++-------
 .../pci/controller/dwc/pcie-designware-plat.c |  70 +--------
 drivers/pci/controller/dwc/pcie-designware.c  |  93 +++++++++++-
 drivers/pci/controller/dwc/pcie-designware.h  |  24 +--
 drivers/pci/controller/dwc/pcie-histb.c       |  37 ++---
 drivers/pci/controller/dwc/pcie-intel-gw.c    |  67 ++-------
 drivers/pci/controller/dwc/pcie-kirin.c       |  62 +-------
 drivers/pci/controller/dwc/pcie-qcom.c        |  38 +----
 drivers/pci/controller/dwc/pcie-spear13xx.c   |  62 +++-----
 drivers/pci/controller/dwc/pcie-tegra194.c    |  41 +----
 drivers/pci/controller/dwc/pcie-uniphier-ep.c |  38 +----
 drivers/pci/controller/dwc/pcie-uniphier.c    |  51 +------
 23 files changed, 356 insertions(+), 1032 deletions(-)

--
2.25.1

[PATCH v2 01/16] PCI: dwc: Support multiple ATU memory regions

[Rob Herring]

The current ATU setup only supports a single memory resource which
isn't sufficient if there are also prefetchable memory regions. In order
to support multiple memory regions, we need to move away from fixed ATU
slots and rework the assignment. As there's always an ATU entry for
config space, let's assign index 0 to config space. Then we assign
memory resources to index 1 and up. Finally, if we have an I/O region
and slots remaining, we assign the I/O region last. If there aren't
remaining slots, we keep the same config and I/O space sharing.

Cc: Vidya Sagar <vidyas@nvidia.com>
Cc: Jingoo Han <jingoohan1@gmail.com>
Cc: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Vidya Sagar <vidyas@nvidia.com>
Tested-by: Vidya Sagar <vidyas@nvidia.com>
Acked-by: Jingoo Han <jingoohan1@gmail.com>
Signed-off-by: Rob Herring <robh@kernel.org>
---
 .../pci/controller/dwc/pcie-designware-host.c | 54 +++++++++++--------
 drivers/pci/controller/dwc/pcie-designware.h  |  6 +--
 2 files changed, 34 insertions(+), 26 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index 44c2a6572199..a6ffab9b537e 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -464,9 +464,7 @@ static void __iomem *dw_pcie_other_conf_map_bus(struct pci_bus *bus,
 		type = PCIE_ATU_TYPE_CFG1;
 
 
-	dw_pcie_prog_outbound_atu(pci, PCIE_ATU_REGION_INDEX1,
-				  type, pp->cfg0_base,
-				  busdev, pp->cfg0_size);
+	dw_pcie_prog_outbound_atu(pci, 0, type, pp->cfg0_base, busdev, pp->cfg0_size);
 
 	return pp->va_cfg0_base + where;
 }
@@ -480,9 +478,8 @@ static int dw_pcie_rd_other_conf(struct pci_bus *bus, unsigned int devfn,
 
 	ret = pci_generic_config_read(bus, devfn, where, size, val);
 
-	if (!ret && pci->num_viewport <= 2)
-		dw_pcie_prog_outbound_atu(pci, PCIE_ATU_REGION_INDEX1,
-					  PCIE_ATU_TYPE_IO, pp->io_base,
+	if (!ret && pci->io_cfg_atu_shared)
+		dw_pcie_prog_outbound_atu(pci, 0, PCIE_ATU_TYPE_IO, pp->io_base,
 					  pp->io_bus_addr, pp->io_size);
 
 	return ret;
@@ -497,9 +494,8 @@ static int dw_pcie_wr_other_conf(struct pci_bus *bus, unsigned int devfn,
 
 	ret = pci_generic_config_write(bus, devfn, where, size, val);
 
-	if (!ret && pci->num_viewport <= 2)
-		dw_pcie_prog_outbound_atu(pci, PCIE_ATU_REGION_INDEX1,
-					  PCIE_ATU_TYPE_IO, pp->io_base,
+	if (!ret && pci->io_cfg_atu_shared)
+		dw_pcie_prog_outbound_atu(pci, 0, PCIE_ATU_TYPE_IO, pp->io_base,
 					  pp->io_bus_addr, pp->io_size);
 
 	return ret;
@@ -586,21 +582,35 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
 	 * ATU, so we should not program the ATU here.
 	 */
 	if (pp->bridge->child_ops == &dw_child_pcie_ops) {
-		struct resource_entry *tmp, *entry = NULL;
+		int atu_idx = 0;
+		struct resource_entry *entry;
 
 		/* Get last memory resource entry */
-		resource_list_for_each_entry(tmp, &pp->bridge->windows)
-			if (resource_type(tmp->res) == IORESOURCE_MEM)
-				entry = tmp;
-
-		dw_pcie_prog_outbound_atu(pci, PCIE_ATU_REGION_INDEX0,
-					  PCIE_ATU_TYPE_MEM, entry->res->start,
-					  entry->res->start - entry->offset,
-					  resource_size(entry->res));
-		if (pci->num_viewport > 2)
-			dw_pcie_prog_outbound_atu(pci, PCIE_ATU_REGION_INDEX2,
-						  PCIE_ATU_TYPE_IO, pp->io_base,
-						  pp->io_bus_addr, pp->io_size);
+		resource_list_for_each_entry(entry, &pp->bridge->windows) {
+			if (resource_type(entry->res) != IORESOURCE_MEM)
+				continue;
+
+			if (pci->num_viewport <= ++atu_idx)
+				break;
+
+			dw_pcie_prog_outbound_atu(pci, atu_idx,
+						  PCIE_ATU_TYPE_MEM, entry->res->start,
+						  entry->res->start - entry->offset,
+						  resource_size(entry->res));
+		}
+
+		if (pp->io_size) {
+			if (pci->num_viewport > ++atu_idx)
+				dw_pcie_prog_outbound_atu(pci, atu_idx,
+							  PCIE_ATU_TYPE_IO, pp->io_base,
+							  pp->io_bus_addr, pp->io_size);
+			else
+				pci->io_cfg_atu_shared = true;
+		}
+
+		if (pci->num_viewport <= atu_idx)
+			dev_warn(pci->dev, "Resources exceed number of ATU entries (%d)",
+				 pci->num_viewport);
 	}
 
 	dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, 0);
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index 9d2f511f13fa..ed19c34dd0fe 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -80,9 +80,6 @@
 #define PCIE_ATU_VIEWPORT		0x900
 #define PCIE_ATU_REGION_INBOUND		BIT(31)
 #define PCIE_ATU_REGION_OUTBOUND	0
-#define PCIE_ATU_REGION_INDEX2		0x2
-#define PCIE_ATU_REGION_INDEX1		0x1
-#define PCIE_ATU_REGION_INDEX0		0x0
 #define PCIE_ATU_CR1			0x904
 #define PCIE_ATU_TYPE_MEM		0x0
 #define PCIE_ATU_TYPE_IO		0x2
@@ -266,7 +263,6 @@ struct dw_pcie {
 	/* Used when iatu_unroll_enabled is true */
 	void __iomem		*atu_base;
 	u32			num_viewport;
-	u8			iatu_unroll_enabled;
 	struct pcie_port	pp;
 	struct dw_pcie_ep	ep;
 	const struct dw_pcie_ops *ops;
@@ -274,6 +270,8 @@ struct dw_pcie {
 	int			num_lanes;
 	int			link_gen;
 	u8			n_fts[2];
+	bool			iatu_unroll_enabled: 1;
+	bool			io_cfg_atu_shared: 1;
 };
 
 #define to_dw_pcie_from_pp(port) container_of((port), struct dw_pcie, pp)
-- 
2.25.1

[PATCH v2 02/16] PCI: dwc/intel-gw: Move ATU offset out of driver match data

[Rob Herring]

The ATU offset should be a register range in DT called 'atu', not driver
match data. Any future platforms with a different ATU offset should add
it to their DT.

This is also in preparation to do DBI resource setup in the core DWC
code, so let's move setting atu_base later in intel_pcie_rc_setup().

Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Rob Herring <robh@kernel.org>
---
 drivers/pci/controller/dwc/pcie-intel-gw.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-intel-gw.c b/drivers/pci/controller/dwc/pcie-intel-gw.c
index 5650cb78acba..77ef88333115 100644
--- a/drivers/pci/controller/dwc/pcie-intel-gw.c
+++ b/drivers/pci/controller/dwc/pcie-intel-gw.c
@@ -58,7 +58,6 @@
 
 struct intel_pcie_soc {
 	unsigned int	pcie_ver;
-	unsigned int	pcie_atu_offset;
 	u32		num_viewport;
 };
 
@@ -155,11 +154,15 @@ static void intel_pcie_init_n_fts(struct dw_pcie *pci)
 
 static void intel_pcie_rc_setup(struct intel_pcie_port *lpp)
 {
+	struct dw_pcie *pci = &lpp->pci;
+
+	pci->atu_base = pci->dbi_base + 0xC0000;
+
 	intel_pcie_ltssm_disable(lpp);
 	intel_pcie_link_setup(lpp);
-	intel_pcie_init_n_fts(&lpp->pci);
-	dw_pcie_setup_rc(&lpp->pci.pp);
-	dw_pcie_upconfig_setup(&lpp->pci);
+	intel_pcie_init_n_fts(pci);
+	dw_pcie_setup_rc(&pci->pp);
+	dw_pcie_upconfig_setup(pci);
 }
 
 static int intel_pcie_ep_rst_init(struct intel_pcie_port *lpp)
@@ -425,7 +428,6 @@ static const struct dw_pcie_host_ops intel_pcie_dw_ops = {
 
 static const struct intel_pcie_soc pcie_data = {
 	.pcie_ver =		0x520A,
-	.pcie_atu_offset =	0xC0000,
 	.num_viewport =		3,
 };
 
@@ -461,7 +463,6 @@ static int intel_pcie_probe(struct platform_device *pdev)
 
 	pci->ops = &intel_pcie_ops;
 	pci->version = data->pcie_ver;
-	pci->atu_base = pci->dbi_base + data->pcie_atu_offset;
 	pp->ops = &intel_pcie_dw_ops;
 
 	ret = dw_pcie_host_init(pp);
-- 
2.25.1

[PATCH v2 03/16] PCI: dwc: Move "dbi", "dbi2", and "addr_space" resource setup into common code

[Rob Herring]

Most DWC drivers use the common register resource names "dbi", "dbi2", and
"addr_space", so let's move their setup into the DWC common code.

This means 'dbi_base' in particular is setup later, but it looks like no
drivers touch DBI registers before dw_pcie_host_init or dw_pcie_ep_init.

Cc: Kishon Vijay Abraham I <kishon@ti.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Murali Karicheri <m-karicheri2@ti.com>
Cc: Minghuan Lian <minghuan.Lian@nxp.com>
Cc: Mingkai Hu <mingkai.hu@nxp.com>
Cc: Roy Zang <roy.zang@nxp.com>
Cc: Jonathan Chocron <jonnyc@amazon.com>
Cc: Jesper Nilsson <jesper.nilsson@axis.com>
Cc: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Cc: Xiaowei Song <songxiaowei@hisilicon.com>
Cc: Binghui Wang <wangbinghui@hisilicon.com>
Cc: Andy Gross <agross@kernel.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: Stanimir Varbanov <svarbanov@mm-sol.com>
Cc: Pratyush Anand <pratyush.anand@gmail.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Jonathan Hunter <jonathanh@nvidia.com>
Cc: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: linux-omap@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-arm-kernel@axis.com
Cc: linux-arm-msm@vger.kernel.org
Cc: linux-tegra@vger.kernel.org
Acked-by: Jingoo Han <jingoohan1@gmail.com>
Signed-off-by: Rob Herring <robh@kernel.org>
---
v2:
 - Fix Layerscape EP build error
---
 drivers/pci/controller/dwc/pci-dra7xx.c       |  8 ----
 drivers/pci/controller/dwc/pci-keystone.c     | 29 +-----------
 .../pci/controller/dwc/pci-layerscape-ep.c    | 37 +--------------
 drivers/pci/controller/dwc/pcie-al.c          |  9 +---
 drivers/pci/controller/dwc/pcie-artpec6.c     | 43 ++----------------
 .../pci/controller/dwc/pcie-designware-ep.c   | 29 ++++++++++--
 .../pci/controller/dwc/pcie-designware-host.c |  7 +++
 .../pci/controller/dwc/pcie-designware-plat.c | 45 +------------------
 drivers/pci/controller/dwc/pcie-intel-gw.c    |  4 --
 drivers/pci/controller/dwc/pcie-kirin.c       |  5 ---
 drivers/pci/controller/dwc/pcie-qcom.c        |  8 ----
 drivers/pci/controller/dwc/pcie-spear13xx.c   | 11 +----
 drivers/pci/controller/dwc/pcie-tegra194.c    | 22 ---------
 drivers/pci/controller/dwc/pcie-uniphier-ep.c | 38 +---------------
 drivers/pci/controller/dwc/pcie-uniphier.c    |  6 ---
 15 files changed, 47 insertions(+), 254 deletions(-)

diff --git a/drivers/pci/controller/dwc/pci-dra7xx.c b/drivers/pci/controller/dwc/pci-dra7xx.c
index 6d012d2b1e90..a4aabc85dbb1 100644
--- a/drivers/pci/controller/dwc/pci-dra7xx.c
+++ b/drivers/pci/controller/dwc/pci-dra7xx.c
@@ -578,7 +578,6 @@ static int __init dra7xx_add_pcie_ep(struct dra7xx_pcie *dra7xx,
 {
 	int ret;
 	struct dw_pcie_ep *ep;
-	struct resource *res;
 	struct device *dev = &pdev->dev;
 	struct dw_pcie *pci = dra7xx->pci;
 
@@ -594,13 +593,6 @@ static int __init dra7xx_add_pcie_ep(struct dra7xx_pcie *dra7xx,
 	if (IS_ERR(pci->dbi_base2))
 		return PTR_ERR(pci->dbi_base2);
 
-	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "addr_space");
-	if (!res)
-		return -EINVAL;
-
-	ep->phys_base = res->start;
-	ep->addr_size = resource_size(res);
-
 	ret = dw_pcie_ep_init(ep);
 	if (ret) {
 		dev_err(dev, "failed to initialize endpoint\n");
diff --git a/drivers/pci/controller/dwc/pci-keystone.c b/drivers/pci/controller/dwc/pci-keystone.c
index a222728238ca..9cf14f13798b 100644
--- a/drivers/pci/controller/dwc/pci-keystone.c
+++ b/drivers/pci/controller/dwc/pci-keystone.c
@@ -977,33 +977,6 @@ static const struct dw_pcie_ep_ops ks_pcie_am654_ep_ops = {
 	.get_features = &ks_pcie_am654_get_features,
 };
 
-static int __init ks_pcie_add_pcie_ep(struct keystone_pcie *ks_pcie,
-				      struct platform_device *pdev)
-{
-	int ret;
-	struct dw_pcie_ep *ep;
-	struct resource *res;
-	struct device *dev = &pdev->dev;
-	struct dw_pcie *pci = ks_pcie->pci;
-
-	ep = &pci->ep;
-
-	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "addr_space");
-	if (!res)
-		return -EINVAL;
-
-	ep->phys_base = res->start;
-	ep->addr_size = resource_size(res);
-
-	ret = dw_pcie_ep_init(ep);
-	if (ret) {
-		dev_err(dev, "failed to initialize endpoint\n");
-		return ret;
-	}
-
-	return 0;
-}
-
 static void ks_pcie_disable_phy(struct keystone_pcie *ks_pcie)
 {
 	int num_lanes = ks_pcie->num_lanes;
@@ -1313,7 +1286,7 @@ static int __init ks_pcie_probe(struct platform_device *pdev)
 		}
 
 		pci->ep.ops = ep_ops;
-		ret = ks_pcie_add_pcie_ep(ks_pcie, pdev);
+		ret = dw_pcie_ep_init(&pci->ep);
 		if (ret < 0)
 			goto err_get_sync;
 		break;
diff --git a/drivers/pci/controller/dwc/pci-layerscape-ep.c b/drivers/pci/controller/dwc/pci-layerscape-ep.c
index 84206f265e54..4d12efdacd2f 100644
--- a/drivers/pci/controller/dwc/pci-layerscape-ep.c
+++ b/drivers/pci/controller/dwc/pci-layerscape-ep.c
@@ -18,8 +18,6 @@
 
 #include "pcie-designware.h"
 
-#define PCIE_DBI2_OFFSET		0x1000	/* DBI2 base address*/
-
 #define to_ls_pcie_ep(x)	dev_get_drvdata((x)->dev)
 
 struct ls_pcie_ep_drvdata {
@@ -124,34 +122,6 @@ static const struct of_device_id ls_pcie_ep_of_match[] = {
 	{ },
 };
 
-static int __init ls_add_pcie_ep(struct ls_pcie_ep *pcie,
-				 struct platform_device *pdev)
-{
-	struct dw_pcie *pci = pcie->pci;
-	struct device *dev = pci->dev;
-	struct dw_pcie_ep *ep;
-	struct resource *res;
-	int ret;
-
-	ep = &pci->ep;
-	ep->ops = pcie->drvdata->ops;
-
-	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "addr_space");
-	if (!res)
-		return -EINVAL;
-
-	ep->phys_base = res->start;
-	ep->addr_size = resource_size(res);
-
-	ret = dw_pcie_ep_init(ep);
-	if (ret) {
-		dev_err(dev, "failed to initialize endpoint\n");
-		return ret;
-	}
-
-	return 0;
-}
-
 static int __init ls_pcie_ep_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -159,7 +129,6 @@ static int __init ls_pcie_ep_probe(struct platform_device *pdev)
 	struct ls_pcie_ep *pcie;
 	struct pci_epc_features *ls_epc;
 	struct resource *dbi_base;
-	int ret;
 
 	pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
 	if (!pcie)
@@ -188,13 +157,11 @@ static int __init ls_pcie_ep_probe(struct platform_device *pdev)
 	if (IS_ERR(pci->dbi_base))
 		return PTR_ERR(pci->dbi_base);
 
-	pci->dbi_base2 = pci->dbi_base + PCIE_DBI2_OFFSET;
+	pci->ep.ops = &ls_pcie_ep_ops;
 
 	platform_set_drvdata(pdev, pcie);
 
-	ret = ls_add_pcie_ep(pcie, pdev);
-
-	return ret;
+	return dw_pcie_ep_init(&pci->ep);
 }
 
 static struct platform_driver ls_pcie_ep_driver = {
diff --git a/drivers/pci/controller/dwc/pcie-al.c b/drivers/pci/controller/dwc/pcie-al.c
index f973fbca90cf..d06866921187 100644
--- a/drivers/pci/controller/dwc/pcie-al.c
+++ b/drivers/pci/controller/dwc/pcie-al.c
@@ -347,7 +347,6 @@ static int al_pcie_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct resource *controller_res;
 	struct resource *ecam_res;
-	struct resource *dbi_res;
 	struct al_pcie *al_pcie;
 	struct dw_pcie *pci;
 
@@ -365,11 +364,6 @@ static int al_pcie_probe(struct platform_device *pdev)
 	al_pcie->pci = pci;
 	al_pcie->dev = dev;
 
-	dbi_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi");
-	pci->dbi_base = devm_pci_remap_cfg_resource(dev, dbi_res);
-	if (IS_ERR(pci->dbi_base))
-		return PTR_ERR(pci->dbi_base);
-
 	ecam_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "config");
 	if (!ecam_res) {
 		dev_err(dev, "couldn't find 'config' reg in DT\n");
@@ -386,8 +380,7 @@ static int al_pcie_probe(struct platform_device *pdev)
 		return PTR_ERR(al_pcie->controller_base);
 	}
 
-	dev_dbg(dev, "From DT: dbi_base: %pR, controller_base: %pR\n",
-		dbi_res, controller_res);
+	dev_dbg(dev, "From DT: controller_base: %pR\n", controller_res);
 
 	platform_set_drvdata(pdev, al_pcie);
 
diff --git a/drivers/pci/controller/dwc/pcie-artpec6.c b/drivers/pci/controller/dwc/pcie-artpec6.c
index 929448e9e0bc..52ad7909cd0c 100644
--- a/drivers/pci/controller/dwc/pcie-artpec6.c
+++ b/drivers/pci/controller/dwc/pcie-artpec6.c
@@ -403,38 +403,6 @@ static const struct dw_pcie_ep_ops pcie_ep_ops = {
 	.raise_irq = artpec6_pcie_raise_irq,
 };
 
-static int artpec6_add_pcie_ep(struct artpec6_pcie *artpec6_pcie,
-			       struct platform_device *pdev)
-{
-	int ret;
-	struct dw_pcie_ep *ep;
-	struct resource *res;
-	struct device *dev = &pdev->dev;
-	struct dw_pcie *pci = artpec6_pcie->pci;
-
-	ep = &pci->ep;
-	ep->ops = &pcie_ep_ops;
-
-	pci->dbi_base2 = devm_platform_ioremap_resource_byname(pdev, "dbi2");
-	if (IS_ERR(pci->dbi_base2))
-		return PTR_ERR(pci->dbi_base2);
-
-	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "addr_space");
-	if (!res)
-		return -EINVAL;
-
-	ep->phys_base = res->start;
-	ep->addr_size = resource_size(res);
-
-	ret = dw_pcie_ep_init(ep);
-	if (ret) {
-		dev_err(dev, "failed to initialize endpoint\n");
-		return ret;
-	}
-
-	return 0;
-}
-
 static int artpec6_pcie_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -469,10 +437,6 @@ static int artpec6_pcie_probe(struct platform_device *pdev)
 	artpec6_pcie->variant = variant;
 	artpec6_pcie->mode = mode;
 
-	pci->dbi_base = devm_platform_ioremap_resource_byname(pdev, "dbi");
-	if (IS_ERR(pci->dbi_base))
-		return PTR_ERR(pci->dbi_base);
-
 	artpec6_pcie->phy_base =
 		devm_platform_ioremap_resource_byname(pdev, "phy");
 	if (IS_ERR(artpec6_pcie->phy_base))
@@ -504,9 +468,10 @@ static int artpec6_pcie_probe(struct platform_device *pdev)
 		val = artpec6_pcie_readl(artpec6_pcie, PCIECFG);
 		val &= ~PCIECFG_DEVICE_TYPE_MASK;
 		artpec6_pcie_writel(artpec6_pcie, PCIECFG, val);
-		ret = artpec6_add_pcie_ep(artpec6_pcie, pdev);
-		if (ret < 0)
-			return ret;
+
+		pci->ep.ops = &pcie_ep_ops;
+
+		return dw_pcie_ep_init(&pci->ep);
 		break;
 	}
 	default:
diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
index ad7da4ea43a5..6fe176e1bdd2 100644
--- a/drivers/pci/controller/dwc/pcie-designware-ep.c
+++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
@@ -7,6 +7,7 @@
  */
 
 #include <linux/of.h>
+#include <linux/platform_device.h>
 
 #include "pcie-designware.h"
 #include <linux/pci-epc.h>
@@ -676,20 +677,42 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep)
 	int ret;
 	void *addr;
 	u8 func_no;
+	struct resource *res;
 	struct pci_epc *epc;
 	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
 	struct device *dev = pci->dev;
+	struct platform_device *pdev = to_platform_device(dev);
 	struct device_node *np = dev->of_node;
 	const struct pci_epc_features *epc_features;
 	struct dw_pcie_ep_func *ep_func;
 
 	INIT_LIST_HEAD(&ep->func_list);
 
-	if (!pci->dbi_base || !pci->dbi_base2) {
-		dev_err(dev, "dbi_base/dbi_base2 is not populated\n");
-		return -EINVAL;
+	if (!pci->dbi_base) {
+		res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi");
+		pci->dbi_base = devm_pci_remap_cfg_resource(dev, res);
+		if (IS_ERR(pci->dbi_base))
+			return PTR_ERR(pci->dbi_base);
+	}
+
+	if (!pci->dbi_base2) {
+		res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi2");
+		if (!res)
+			pci->dbi_base2 = pci->dbi_base + SZ_4K;
+		else {
+			pci->dbi_base2 = devm_pci_remap_cfg_resource(dev, res);
+			if (IS_ERR(pci->dbi_base2))
+				return PTR_ERR(pci->dbi_base2);
+		}
 	}
 
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "addr_space");
+	if (!res)
+		return -EINVAL;
+
+	ep->phys_base = res->start;
+	ep->addr_size = resource_size(res);
+
 	ret = of_property_read_u32(np, "num-ib-windows", &ep->num_ib_windows);
 	if (ret < 0) {
 		dev_err(dev, "Unable to read *num-ib-windows* property\n");
diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index a6ffab9b537e..cde45b2076ee 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -310,6 +310,13 @@ int dw_pcie_host_init(struct pcie_port *pp)
 		dev_err(dev, "Missing *config* reg space\n");
 	}
 
+	if (!pci->dbi_base) {
+		struct resource *dbi_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi");
+		pci->dbi_base = devm_pci_remap_cfg_resource(dev, dbi_res);
+		if (IS_ERR(pci->dbi_base))
+			return PTR_ERR(pci->dbi_base);
+	}
+
 	bridge = devm_pci_alloc_host_bridge(dev, 0);
 	if (!bridge)
 		return -ENOMEM;
diff --git a/drivers/pci/controller/dwc/pcie-designware-plat.c b/drivers/pci/controller/dwc/pcie-designware-plat.c
index e3e300669ed5..562a05e07b1d 100644
--- a/drivers/pci/controller/dwc/pcie-designware-plat.c
+++ b/drivers/pci/controller/dwc/pcie-designware-plat.c
@@ -139,43 +139,11 @@ static int dw_plat_add_pcie_port(struct dw_plat_pcie *dw_plat_pcie,
 	return 0;
 }
 
-static int dw_plat_add_pcie_ep(struct dw_plat_pcie *dw_plat_pcie,
-			       struct platform_device *pdev)
-{
-	int ret;
-	struct dw_pcie_ep *ep;
-	struct resource *res;
-	struct device *dev = &pdev->dev;
-	struct dw_pcie *pci = dw_plat_pcie->pci;
-
-	ep = &pci->ep;
-	ep->ops = &pcie_ep_ops;
-
-	pci->dbi_base2 = devm_platform_ioremap_resource_byname(pdev, "dbi2");
-	if (IS_ERR(pci->dbi_base2))
-		return PTR_ERR(pci->dbi_base2);
-
-	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "addr_space");
-	if (!res)
-		return -EINVAL;
-
-	ep->phys_base = res->start;
-	ep->addr_size = resource_size(res);
-
-	ret = dw_pcie_ep_init(ep);
-	if (ret) {
-		dev_err(dev, "Failed to initialize endpoint\n");
-		return ret;
-	}
-	return 0;
-}
-
 static int dw_plat_pcie_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct dw_plat_pcie *dw_plat_pcie;
 	struct dw_pcie *pci;
-	struct resource *res;  /* Resource from DT */
 	int ret;
 	const struct of_device_id *match;
 	const struct dw_plat_pcie_of_data *data;
@@ -202,14 +170,6 @@ static int dw_plat_pcie_probe(struct platform_device *pdev)
 	dw_plat_pcie->pci = pci;
 	dw_plat_pcie->mode = mode;
 
-	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi");
-	if (!res)
-		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-
-	pci->dbi_base = devm_ioremap_resource(dev, res);
-	if (IS_ERR(pci->dbi_base))
-		return PTR_ERR(pci->dbi_base);
-
 	platform_set_drvdata(pdev, dw_plat_pcie);
 
 	switch (dw_plat_pcie->mode) {
@@ -225,9 +185,8 @@ static int dw_plat_pcie_probe(struct platform_device *pdev)
 		if (!IS_ENABLED(CONFIG_PCIE_DW_PLAT_EP))
 			return -ENODEV;
 
-		ret = dw_plat_add_pcie_ep(dw_plat_pcie, pdev);
-		if (ret < 0)
-			return ret;
+		pci->ep.ops = &pcie_ep_ops;
+		return dw_pcie_ep_init(&pci->ep);
 		break;
 	default:
 		dev_err(dev, "INVALID device type %d\n", dw_plat_pcie->mode);
diff --git a/drivers/pci/controller/dwc/pcie-intel-gw.c b/drivers/pci/controller/dwc/pcie-intel-gw.c
index 77ef88333115..88782653ed21 100644
--- a/drivers/pci/controller/dwc/pcie-intel-gw.c
+++ b/drivers/pci/controller/dwc/pcie-intel-gw.c
@@ -237,10 +237,6 @@ static int intel_pcie_get_resources(struct platform_device *pdev)
 	struct device *dev = pci->dev;
 	int ret;
 
-	pci->dbi_base = devm_platform_ioremap_resource_byname(pdev, "dbi");
-	if (IS_ERR(pci->dbi_base))
-		return PTR_ERR(pci->dbi_base);
-
 	lpp->core_clk = devm_clk_get(dev, NULL);
 	if (IS_ERR(lpp->core_clk)) {
 		ret = PTR_ERR(lpp->core_clk);
diff --git a/drivers/pci/controller/dwc/pcie-kirin.c b/drivers/pci/controller/dwc/pcie-kirin.c
index d0a6a2dee6f5..3042a23cf09a 100644
--- a/drivers/pci/controller/dwc/pcie-kirin.c
+++ b/drivers/pci/controller/dwc/pcie-kirin.c
@@ -157,11 +157,6 @@ static long kirin_pcie_get_resource(struct kirin_pcie *kirin_pcie,
 	if (IS_ERR(kirin_pcie->phy_base))
 		return PTR_ERR(kirin_pcie->phy_base);
 
-	kirin_pcie->pci->dbi_base =
-		devm_platform_ioremap_resource_byname(pdev, "dbi");
-	if (IS_ERR(kirin_pcie->pci->dbi_base))
-		return PTR_ERR(kirin_pcie->pci->dbi_base);
-
 	kirin_pcie->crgctrl =
 		syscon_regmap_lookup_by_compatible("hisilicon,hi3660-crgctrl");
 	if (IS_ERR(kirin_pcie->crgctrl))
diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index b4761640ffd9..3b4f70b9f3f0 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -1368,7 +1368,6 @@ static const struct dw_pcie_ops dw_pcie_ops = {
 static int qcom_pcie_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
-	struct resource *res;
 	struct pcie_port *pp;
 	struct dw_pcie *pci;
 	struct qcom_pcie *pcie;
@@ -1407,13 +1406,6 @@ static int qcom_pcie_probe(struct platform_device *pdev)
 		goto err_pm_runtime_put;
 	}
 
-	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi");
-	pci->dbi_base = devm_pci_remap_cfg_resource(dev, res);
-	if (IS_ERR(pci->dbi_base)) {
-		ret = PTR_ERR(pci->dbi_base);
-		goto err_pm_runtime_put;
-	}
-
 	pcie->elbi = devm_platform_ioremap_resource_byname(pdev, "elbi");
 	if (IS_ERR(pcie->elbi)) {
 		ret = PTR_ERR(pcie->elbi);
diff --git a/drivers/pci/controller/dwc/pcie-spear13xx.c b/drivers/pci/controller/dwc/pcie-spear13xx.c
index e348225f651f..1ed7e3501ff1 100644
--- a/drivers/pci/controller/dwc/pcie-spear13xx.c
+++ b/drivers/pci/controller/dwc/pcie-spear13xx.c
@@ -152,6 +152,8 @@ static int spear13xx_pcie_host_init(struct pcie_port *pp)
 	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
 	struct spear13xx_pcie *spear13xx_pcie = to_spear13xx_pcie(pci);
 
+	spear13xx_pcie->app_base = pci->dbi_base + 0x2000;
+
 	spear13xx_pcie_establish_link(spear13xx_pcie);
 	spear13xx_pcie_enable_interrupts(spear13xx_pcie);
 
@@ -203,7 +205,6 @@ static int spear13xx_pcie_probe(struct platform_device *pdev)
 	struct dw_pcie *pci;
 	struct spear13xx_pcie *spear13xx_pcie;
 	struct device_node *np = dev->of_node;
-	struct resource *dbi_base;
 	int ret;
 
 	spear13xx_pcie = devm_kzalloc(dev, sizeof(*spear13xx_pcie), GFP_KERNEL);
@@ -242,14 +243,6 @@ static int spear13xx_pcie_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	dbi_base = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi");
-	pci->dbi_base = devm_pci_remap_cfg_resource(dev, dbi_base);
-	if (IS_ERR(pci->dbi_base)) {
-		ret = PTR_ERR(pci->dbi_base);
-		goto fail_clk;
-	}
-	spear13xx_pcie->app_base = pci->dbi_base + 0x2000;
-
 	if (of_property_read_bool(np, "st,pcie-is-gen1"))
 		pci->link_gen = 1;
 
diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c
index f920e7efe118..f8fca6794282 100644
--- a/drivers/pci/controller/dwc/pcie-tegra194.c
+++ b/drivers/pci/controller/dwc/pcie-tegra194.c
@@ -1907,19 +1907,12 @@ static int tegra_pcie_config_ep(struct tegra_pcie_dw *pcie,
 	struct dw_pcie *pci = &pcie->pci;
 	struct device *dev = pcie->dev;
 	struct dw_pcie_ep *ep;
-	struct resource *res;
 	char *name;
 	int ret;
 
 	ep = &pci->ep;
 	ep->ops = &pcie_ep_ops;
 
-	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "addr_space");
-	if (!res)
-		return -EINVAL;
-
-	ep->phys_base = res->start;
-	ep->addr_size = resource_size(res);
 	ep->page_size = SZ_64K;
 
 	ret = gpiod_set_debounce(pcie->pex_rst_gpiod, PERST_DEBOUNCE_TIME);
@@ -1982,7 +1975,6 @@ static int tegra_pcie_dw_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct resource *atu_dma_res;
 	struct tegra_pcie_dw *pcie;
-	struct resource *dbi_res;
 	struct pcie_port *pp;
 	struct dw_pcie *pci;
 	struct phy **phys;
@@ -2091,20 +2083,6 @@ static int tegra_pcie_dw_probe(struct platform_device *pdev)
 
 	pcie->phys = phys;
 
-	dbi_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi");
-	if (!dbi_res) {
-		dev_err(dev, "Failed to find \"dbi\" region\n");
-		return -ENODEV;
-	}
-	pcie->dbi_res = dbi_res;
-
-	pci->dbi_base = devm_ioremap_resource(dev, dbi_res);
-	if (IS_ERR(pci->dbi_base))
-		return PTR_ERR(pci->dbi_base);
-
-	/* Tegra HW locates DBI2 at a fixed offset from DBI */
-	pci->dbi_base2 = pci->dbi_base + 0x1000;
-
 	atu_dma_res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
 						   "atu_dma");
 	if (!atu_dma_res) {
diff --git a/drivers/pci/controller/dwc/pcie-uniphier-ep.c b/drivers/pci/controller/dwc/pcie-uniphier-ep.c
index 148355960061..69810c6b0d58 100644
--- a/drivers/pci/controller/dwc/pcie-uniphier-ep.c
+++ b/drivers/pci/controller/dwc/pcie-uniphier-ep.c
@@ -218,35 +218,6 @@ static const struct dw_pcie_ep_ops uniphier_pcie_ep_ops = {
 	.get_features = uniphier_pcie_get_features,
 };
 
-static int uniphier_add_pcie_ep(struct uniphier_pcie_ep_priv *priv,
-				struct platform_device *pdev)
-{
-	struct dw_pcie *pci = &priv->pci;
-	struct dw_pcie_ep *ep = &pci->ep;
-	struct device *dev = &pdev->dev;
-	struct resource *res;
-	int ret;
-
-	ep->ops = &uniphier_pcie_ep_ops;
-
-	pci->dbi_base2 = devm_platform_ioremap_resource_byname(pdev, "dbi2");
-	if (IS_ERR(pci->dbi_base2))
-		return PTR_ERR(pci->dbi_base2);
-
-	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "addr_space");
-	if (!res)
-		return -EINVAL;
-
-	ep->phys_base = res->start;
-	ep->addr_size = resource_size(res);
-
-	ret = dw_pcie_ep_init(ep);
-	if (ret)
-		dev_err(dev, "Failed to initialize endpoint (%d)\n", ret);
-
-	return ret;
-}
-
 static int uniphier_pcie_ep_enable(struct uniphier_pcie_ep_priv *priv)
 {
 	int ret;
@@ -300,7 +271,6 @@ static int uniphier_pcie_ep_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct uniphier_pcie_ep_priv *priv;
-	struct resource *res;
 	int ret;
 
 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
@@ -314,11 +284,6 @@ static int uniphier_pcie_ep_probe(struct platform_device *pdev)
 	priv->pci.dev = dev;
 	priv->pci.ops = &dw_pcie_ops;
 
-	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi");
-	priv->pci.dbi_base = devm_pci_remap_cfg_resource(dev, res);
-	if (IS_ERR(priv->pci.dbi_base))
-		return PTR_ERR(priv->pci.dbi_base);
-
 	priv->base = devm_platform_ioremap_resource_byname(pdev, "link");
 	if (IS_ERR(priv->base))
 		return PTR_ERR(priv->base);
@@ -352,7 +317,8 @@ static int uniphier_pcie_ep_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
-	return uniphier_add_pcie_ep(priv, pdev);
+	priv->pci.ep.ops = &uniphier_pcie_ep_ops;
+	return dw_pcie_ep_init(&priv->pci.ep);
 }
 
 static const struct pci_epc_features uniphier_pro5_data = {
diff --git a/drivers/pci/controller/dwc/pcie-uniphier.c b/drivers/pci/controller/dwc/pcie-uniphier.c
index 48176265c867..33130fb4af90 100644
--- a/drivers/pci/controller/dwc/pcie-uniphier.c
+++ b/drivers/pci/controller/dwc/pcie-uniphier.c
@@ -400,7 +400,6 @@ static int uniphier_pcie_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct uniphier_pcie_priv *priv;
-	struct resource *res;
 	int ret;
 
 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
@@ -410,11 +409,6 @@ static int uniphier_pcie_probe(struct platform_device *pdev)
 	priv->pci.dev = dev;
 	priv->pci.ops = &dw_pcie_ops;
 
-	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi");
-	priv->pci.dbi_base = devm_pci_remap_cfg_resource(dev, res);
-	if (IS_ERR(priv->pci.dbi_base))
-		return PTR_ERR(priv->pci.dbi_base);
-
 	priv->base = devm_platform_ioremap_resource_byname(pdev, "link");
 	if (IS_ERR(priv->base))
 		return PTR_ERR(priv->base);
-- 
2.25.1

[PATCH v2 04/16] PCI: dwc/intel-gw: Remove some unneeded function wrappers

[Rob Herring]

Remove some of the pointless levels of functions that just wrap or group
a series of other functions.

Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Rob Herring <robh@kernel.org>
---
 drivers/pci/controller/dwc/pcie-intel-gw.c | 47 ++++++++--------------
 1 file changed, 16 insertions(+), 31 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-intel-gw.c b/drivers/pci/controller/dwc/pcie-intel-gw.c
index 88782653ed21..c562eb7454b1 100644
--- a/drivers/pci/controller/dwc/pcie-intel-gw.c
+++ b/drivers/pci/controller/dwc/pcie-intel-gw.c
@@ -152,19 +152,6 @@ static void intel_pcie_init_n_fts(struct dw_pcie *pci)
 	pci->n_fts[0] = PORT_AFR_N_FTS_GEN12_DFT;
 }
 
-static void intel_pcie_rc_setup(struct intel_pcie_port *lpp)
-{
-	struct dw_pcie *pci = &lpp->pci;
-
-	pci->atu_base = pci->dbi_base + 0xC0000;
-
-	intel_pcie_ltssm_disable(lpp);
-	intel_pcie_link_setup(lpp);
-	intel_pcie_init_n_fts(pci);
-	dw_pcie_setup_rc(&pci->pp);
-	dw_pcie_upconfig_setup(pci);
-}
-
 static int intel_pcie_ep_rst_init(struct intel_pcie_port *lpp)
 {
 	struct device *dev = lpp->pci.dev;
@@ -216,14 +203,6 @@ static void intel_pcie_device_rst_deassert(struct intel_pcie_port *lpp)
 	gpiod_set_value_cansleep(lpp->reset_gpio, 0);
 }
 
-static int intel_pcie_app_logic_setup(struct intel_pcie_port *lpp)
-{
-	intel_pcie_device_rst_deassert(lpp);
-	intel_pcie_ltssm_enable(lpp);
-
-	return dw_pcie_wait_for_link(&lpp->pci);
-}
-
 static void intel_pcie_core_irq_disable(struct intel_pcie_port *lpp)
 {
 	pcie_app_wr(lpp, PCIE_APP_IRNEN, 0);
@@ -273,11 +252,6 @@ static int intel_pcie_get_resources(struct platform_device *pdev)
 	return 0;
 }
 
-static void intel_pcie_deinit_phy(struct intel_pcie_port *lpp)
-{
-	phy_exit(lpp->phy);
-}
-
 static int intel_pcie_wait_l2(struct intel_pcie_port *lpp)
 {
 	u32 value;
@@ -314,6 +288,7 @@ static void intel_pcie_turn_off(struct intel_pcie_port *lpp)
 static int intel_pcie_host_setup(struct intel_pcie_port *lpp)
 {
 	int ret;
+	struct dw_pcie *pci = &lpp->pci;
 
 	intel_pcie_core_rst_assert(lpp);
 	intel_pcie_device_rst_assert(lpp);
@@ -330,8 +305,18 @@ static int intel_pcie_host_setup(struct intel_pcie_port *lpp)
 		goto clk_err;
 	}
 
-	intel_pcie_rc_setup(lpp);
-	ret = intel_pcie_app_logic_setup(lpp);
+	pci->atu_base = pci->dbi_base + 0xC0000;
+
+	intel_pcie_ltssm_disable(lpp);
+	intel_pcie_link_setup(lpp);
+	intel_pcie_init_n_fts(pci);
+	dw_pcie_setup_rc(&pci->pp);
+	dw_pcie_upconfig_setup(pci);
+
+	intel_pcie_device_rst_deassert(lpp);
+	intel_pcie_ltssm_enable(lpp);
+
+	ret = dw_pcie_wait_for_link(pci);
 	if (ret)
 		goto app_init_err;
 
@@ -345,7 +330,7 @@ static int intel_pcie_host_setup(struct intel_pcie_port *lpp)
 	clk_disable_unprepare(lpp->core_clk);
 clk_err:
 	intel_pcie_core_rst_assert(lpp);
-	intel_pcie_deinit_phy(lpp);
+	phy_exit(lpp->phy);
 
 	return ret;
 }
@@ -356,7 +341,7 @@ static void __intel_pcie_remove(struct intel_pcie_port *lpp)
 	intel_pcie_turn_off(lpp);
 	clk_disable_unprepare(lpp->core_clk);
 	intel_pcie_core_rst_assert(lpp);
-	intel_pcie_deinit_phy(lpp);
+	phy_exit(lpp->phy);
 }
 
 static int intel_pcie_remove(struct platform_device *pdev)
@@ -380,7 +365,7 @@ static int __maybe_unused intel_pcie_suspend_noirq(struct device *dev)
 	if (ret)
 		return ret;
 
-	intel_pcie_deinit_phy(lpp);
+	phy_exit(lpp->phy);
 	clk_disable_unprepare(lpp->core_clk);
 	return ret;
 }
-- 
2.25.1

[PATCH v2 05/16] PCI: dwc: Ensure all outbound ATU windows are reset

[Rob Herring]

The Layerscape driver clears the ATU registers which may have been
configured by the bootloader. Any driver could have the same issue
and doing it for all drivers doesn't hurt, so let's move it into the
common DWC code.

Cc: Minghuan Lian <minghuan.Lian@nxp.com>
Cc: Mingkai Hu <mingkai.hu@nxp.com>
Cc: Roy Zang <roy.zang@nxp.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Jingoo Han <jingoohan1@gmail.com>
Cc: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Cc: linuxppc-dev@lists.ozlabs.org
Acked-by: Jingoo Han <jingoohan1@gmail.com>
Signed-off-by: Rob Herring <robh@kernel.org>
---
 drivers/pci/controller/dwc/pci-layerscape.c       | 14 --------------
 drivers/pci/controller/dwc/pcie-designware-host.c |  5 +++++
 2 files changed, 5 insertions(+), 14 deletions(-)

diff --git a/drivers/pci/controller/dwc/pci-layerscape.c b/drivers/pci/controller/dwc/pci-layerscape.c
index f24f79a70d9a..53e56d54c482 100644
--- a/drivers/pci/controller/dwc/pci-layerscape.c
+++ b/drivers/pci/controller/dwc/pci-layerscape.c
@@ -83,14 +83,6 @@ static void ls_pcie_drop_msg_tlp(struct ls_pcie *pcie)
 	iowrite32(val, pci->dbi_base + PCIE_STRFMR1);
 }
 
-static void ls_pcie_disable_outbound_atus(struct ls_pcie *pcie)
-{
-	int i;
-
-	for (i = 0; i < PCIE_IATU_NUM; i++)
-		dw_pcie_disable_atu(pcie->pci, i, DW_PCIE_REGION_OUTBOUND);
-}
-
 static int ls1021_pcie_link_up(struct dw_pcie *pci)
 {
 	u32 state;
@@ -136,12 +128,6 @@ static int ls_pcie_host_init(struct pcie_port *pp)
 	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
 	struct ls_pcie *pcie = to_ls_pcie(pci);
 
-	/*
-	 * Disable outbound windows configured by the bootloader to avoid
-	 * one transaction hitting multiple outbound windows.
-	 * dw_pcie_setup_rc() will reconfigure the outbound windows.
-	 */
-	ls_pcie_disable_outbound_atus(pcie);
 	ls_pcie_fix_error_response(pcie);
 
 	dw_pcie_dbi_ro_wr_en(pci);
diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index cde45b2076ee..265a48f1a0ae 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -534,6 +534,7 @@ static struct pci_ops dw_pcie_ops = {
 
 void dw_pcie_setup_rc(struct pcie_port *pp)
 {
+	int i;
 	u32 val, ctrl, num_ctrls;
 	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
 
@@ -583,6 +584,10 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
 		PCI_COMMAND_MASTER | PCI_COMMAND_SERR;
 	dw_pcie_writel_dbi(pci, PCI_COMMAND, val);
 
+	/* Ensure all outbound windows are disabled so there are multiple matches */
+	for (i = 0; i < pci->num_viewport; i++)
+		dw_pcie_disable_atu(pci, i, DW_PCIE_REGION_OUTBOUND);
+
 	/*
 	 * If the platform provides its own child bus config accesses, it means
 	 * the platform uses its own address translation component rather than
-- 
2.25.1

[PATCH v2 06/16] PCI: dwc/dra7xx: Use the common MSI irq_chip

[Rob Herring]

The dra7xx MSI irq_chip implementation is identical to the default DWC one.
The only difference is the interrupt handler as the MSI interrupt is muxed
with other interrupts, but that doesn't affect the irq_chip part of it.

Cc: Kishon Vijay Abraham I <kishon@ti.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: linux-omap@vger.kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>
---
 drivers/pci/controller/dwc/pci-dra7xx.c | 125 ------------------------
 1 file changed, 125 deletions(-)

diff --git a/drivers/pci/controller/dwc/pci-dra7xx.c b/drivers/pci/controller/dwc/pci-dra7xx.c
index a4aabc85dbb1..4d0c35a4aa59 100644
--- a/drivers/pci/controller/dwc/pci-dra7xx.c
+++ b/drivers/pci/controller/dwc/pci-dra7xx.c
@@ -377,133 +377,8 @@ static int dra7xx_pcie_init_irq_domain(struct pcie_port *pp)
 	return 0;
 }
 
-static void dra7xx_pcie_setup_msi_msg(struct irq_data *d, struct msi_msg *msg)
-{
-	struct pcie_port *pp = irq_data_get_irq_chip_data(d);
-	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
-	u64 msi_target;
-
-	msi_target = (u64)pp->msi_data;
-
-	msg->address_lo = lower_32_bits(msi_target);
-	msg->address_hi = upper_32_bits(msi_target);
-
-	msg->data = d->hwirq;
-
-	dev_dbg(pci->dev, "msi#%d address_hi %#x address_lo %#x\n",
-		(int)d->hwirq, msg->address_hi, msg->address_lo);
-}
-
-static int dra7xx_pcie_msi_set_affinity(struct irq_data *d,
-					const struct cpumask *mask,
-					bool force)
-{
-	return -EINVAL;
-}
-
-static void dra7xx_pcie_bottom_mask(struct irq_data *d)
-{
-	struct pcie_port *pp = irq_data_get_irq_chip_data(d);
-	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
-	unsigned int res, bit, ctrl;
-	unsigned long flags;
-
-	raw_spin_lock_irqsave(&pp->lock, flags);
-
-	ctrl = d->hwirq / MAX_MSI_IRQS_PER_CTRL;
-	res = ctrl * MSI_REG_CTRL_BLOCK_SIZE;
-	bit = d->hwirq % MAX_MSI_IRQS_PER_CTRL;
-
-	pp->irq_mask[ctrl] |= BIT(bit);
-	dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_MASK + res,
-			   pp->irq_mask[ctrl]);
-
-	raw_spin_unlock_irqrestore(&pp->lock, flags);
-}
-
-static void dra7xx_pcie_bottom_unmask(struct irq_data *d)
-{
-	struct pcie_port *pp = irq_data_get_irq_chip_data(d);
-	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
-	unsigned int res, bit, ctrl;
-	unsigned long flags;
-
-	raw_spin_lock_irqsave(&pp->lock, flags);
-
-	ctrl = d->hwirq / MAX_MSI_IRQS_PER_CTRL;
-	res = ctrl * MSI_REG_CTRL_BLOCK_SIZE;
-	bit = d->hwirq % MAX_MSI_IRQS_PER_CTRL;
-
-	pp->irq_mask[ctrl] &= ~BIT(bit);
-	dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_MASK + res,
-			   pp->irq_mask[ctrl]);
-
-	raw_spin_unlock_irqrestore(&pp->lock, flags);
-}
-
-static void dra7xx_pcie_bottom_ack(struct irq_data *d)
-{
-	struct pcie_port *pp  = irq_data_get_irq_chip_data(d);
-	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
-	unsigned int res, bit, ctrl;
-
-	ctrl = d->hwirq / MAX_MSI_IRQS_PER_CTRL;
-	res = ctrl * MSI_REG_CTRL_BLOCK_SIZE;
-	bit = d->hwirq % MAX_MSI_IRQS_PER_CTRL;
-
-	dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_STATUS + res, BIT(bit));
-}
-
-static struct irq_chip dra7xx_pci_msi_bottom_irq_chip = {
-	.name = "DRA7XX-PCI-MSI",
-	.irq_ack = dra7xx_pcie_bottom_ack,
-	.irq_compose_msi_msg = dra7xx_pcie_setup_msi_msg,
-	.irq_set_affinity = dra7xx_pcie_msi_set_affinity,
-	.irq_mask = dra7xx_pcie_bottom_mask,
-	.irq_unmask = dra7xx_pcie_bottom_unmask,
-};
-
-static int dra7xx_pcie_msi_host_init(struct pcie_port *pp)
-{
-	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
-	struct device *dev = pci->dev;
-	u32 ctrl, num_ctrls;
-	int ret;
-
-	pp->msi_irq_chip = &dra7xx_pci_msi_bottom_irq_chip;
-
-	num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL;
-	/* Initialize IRQ Status array */
-	for (ctrl = 0; ctrl < num_ctrls; ctrl++) {
-		pp->irq_mask[ctrl] = ~0;
-		dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_MASK +
-				    (ctrl * MSI_REG_CTRL_BLOCK_SIZE),
-				    pp->irq_mask[ctrl]);
-		dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_ENABLE +
-				    (ctrl * MSI_REG_CTRL_BLOCK_SIZE),
-				    ~0);
-	}
-
-	ret = dw_pcie_allocate_domains(pp);
-	if (ret)
-		return ret;
-
-	pp->msi_data = dma_map_single_attrs(dev, &pp->msi_msg,
-					   sizeof(pp->msi_msg),
-					   DMA_FROM_DEVICE,
-					   DMA_ATTR_SKIP_CPU_SYNC);
-	ret = dma_mapping_error(dev, pp->msi_data);
-	if (ret) {
-		dev_err(dev, "Failed to map MSI data\n");
-		pp->msi_data = 0;
-		dw_pcie_free_msi(pp);
-	}
-	return ret;
-}
-
 static const struct dw_pcie_host_ops dra7xx_pcie_host_ops = {
 	.host_init = dra7xx_pcie_host_init,
-	.msi_host_init = dra7xx_pcie_msi_host_init,
 };
 
 static void dra7xx_pcie_ep_init(struct dw_pcie_ep *ep)
-- 
2.25.1

[PATCH v2 07/16] PCI: dwc: Drop the .set_num_vectors() host op

[Rob Herring]

There's no reason for the .set_num_vectors() host op. Drivers needing a
non-default value can just initialize pcie_port.num_vectors directly.

Cc: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Jonathan Hunter <jonathanh@nvidia.com>
Cc: linux-tegra@vger.kernel.org
Acked-by: Jingoo Han <jingoohan1@gmail.com>
Signed-off-by: Rob Herring <robh@kernel.org>
---
 .../pci/controller/dwc/pcie-designware-host.c | 19 ++++---------------
 .../pci/controller/dwc/pcie-designware-plat.c |  7 +------
 drivers/pci/controller/dwc/pcie-designware.h  |  1 -
 drivers/pci/controller/dwc/pcie-tegra194.c    |  7 +------
 4 files changed, 6 insertions(+), 28 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index 265a48f1a0ae..1bd6a9762426 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -365,22 +365,11 @@ int dw_pcie_host_init(struct pcie_port *pp)
 		pci->link_gen = of_pci_get_max_link_speed(np);
 
 	if (pci_msi_enabled()) {
-		/*
-		 * If a specific SoC driver needs to change the
-		 * default number of vectors, it needs to implement
-		 * the set_num_vectors callback.
-		 */
-		if (!pp->ops->set_num_vectors) {
+		if (!pp->num_vectors) {
 			pp->num_vectors = MSI_DEF_NUM_VECTORS;
-		} else {
-			pp->ops->set_num_vectors(pp);
-
-			if (pp->num_vectors > MAX_MSI_IRQS ||
-			    pp->num_vectors == 0) {
-				dev_err(dev,
-					"Invalid number of vectors\n");
-				return -EINVAL;
-			}
+		} else if (pp->num_vectors > MAX_MSI_IRQS) {
+			dev_err(dev, "Invalid number of vectors\n");
+			return -EINVAL;
 		}
 
 		if (!pp->ops->msi_host_init) {
diff --git a/drivers/pci/controller/dwc/pcie-designware-plat.c b/drivers/pci/controller/dwc/pcie-designware-plat.c
index 562a05e07b1d..13fede1d4157 100644
--- a/drivers/pci/controller/dwc/pcie-designware-plat.c
+++ b/drivers/pci/controller/dwc/pcie-designware-plat.c
@@ -44,14 +44,8 @@ static int dw_plat_pcie_host_init(struct pcie_port *pp)
 	return 0;
 }
 
-static void dw_plat_set_num_vectors(struct pcie_port *pp)
-{
-	pp->num_vectors = MAX_MSI_IRQS;
-}
-
 static const struct dw_pcie_host_ops dw_plat_pcie_host_ops = {
 	.host_init = dw_plat_pcie_host_init,
-	.set_num_vectors = dw_plat_set_num_vectors,
 };
 
 static int dw_plat_pcie_establish_link(struct dw_pcie *pci)
@@ -128,6 +122,7 @@ static int dw_plat_add_pcie_port(struct dw_plat_pcie *dw_plat_pcie,
 			return pp->msi_irq;
 	}
 
+	pp->num_vectors = MAX_MSI_IRQS;
 	pp->ops = &dw_plat_pcie_host_ops;
 
 	ret = dw_pcie_host_init(pp);
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index ed19c34dd0fe..96382dcb2859 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -171,7 +171,6 @@ enum dw_pcie_device_mode {
 
 struct dw_pcie_host_ops {
 	int (*host_init)(struct pcie_port *pp);
-	void (*set_num_vectors)(struct pcie_port *pp);
 	int (*msi_host_init)(struct pcie_port *pp);
 };
 
diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c
index f8fca6794282..5e2841f58700 100644
--- a/drivers/pci/controller/dwc/pcie-tegra194.c
+++ b/drivers/pci/controller/dwc/pcie-tegra194.c
@@ -990,11 +990,6 @@ static int tegra_pcie_dw_link_up(struct dw_pcie *pci)
 	return !!(val & PCI_EXP_LNKSTA_DLLLA);
 }
 
-static void tegra_pcie_set_msi_vec_num(struct pcie_port *pp)
-{
-	pp->num_vectors = MAX_MSI_IRQS;
-}
-
 static int tegra_pcie_dw_start_link(struct dw_pcie *pci)
 {
 	struct tegra_pcie_dw *pcie = to_tegra_pcie(pci);
@@ -1019,7 +1014,6 @@ static const struct dw_pcie_ops tegra_dw_pcie_ops = {
 
 static struct dw_pcie_host_ops tegra_pcie_dw_host_ops = {
 	.host_init = tegra_pcie_dw_host_init,
-	.set_num_vectors = tegra_pcie_set_msi_vec_num,
 };
 
 static void tegra_pcie_disable_phy(struct tegra_pcie_dw *pcie)
@@ -1995,6 +1989,7 @@ static int tegra_pcie_dw_probe(struct platform_device *pdev)
 	pci->n_fts[1] = FTS_VAL;
 
 	pp = &pci->pp;
+	pp->num_vectors = MAX_MSI_IRQS;
 	pcie->dev = &pdev->dev;
 	pcie->mode = (enum dw_pcie_device_mode)data->mode;
 
-- 
2.25.1

[PATCH v2 08/16] PCI: dwc: Move MSI interrupt setup into DWC common code

[Rob Herring]

Platforms using the built-in DWC MSI controller all have a dedicated
interrupt with "msi" name or at index 0, so let's move setting up the
interrupt to the common DWC code.

spear13xx and dra7xx are the 2 oddballs with muxed interrupts, so
we need to prevent configuring the MSI interrupt by setting msi_irq
to negative.

Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Kukjin Kim <kgene@kernel.org>
Cc: Krzysztof Kozlowski <krzk@kernel.org>
Cc: Richard Zhu <hongxing.zhu@nxp.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Pengutronix Kernel Team <kernel@pengutronix.de>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: NXP Linux Team <linux-imx@nxp.com>
Cc: Yue Wang <yue.wang@Amlogic.com>
Cc: Kevin Hilman <khilman@baylibre.com>
Cc: Neil Armstrong <narmstrong@baylibre.com>
Cc: Jerome Brunet <jbrunet@baylibre.com>
Cc: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Cc: Jesper Nilsson <jesper.nilsson@axis.com>
Cc: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Cc: Xiaowei Song <songxiaowei@hisilicon.com>
Cc: Binghui Wang <wangbinghui@hisilicon.com>
Cc: Stanimir Varbanov <svarbanov@mm-sol.com>
Cc: Andy Gross <agross@kernel.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: Pratyush Anand <pratyush.anand@gmail.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Jonathan Hunter <jonathanh@nvidia.com>
Cc: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: linux-samsung-soc@vger.kernel.org
Cc: linux-amlogic@lists.infradead.org
Cc: linux-arm-kernel@axis.com
Cc: linux-arm-msm@vger.kernel.org
Cc: linux-tegra@vger.kernel.org
Acked-by: Jingoo Han <jingoohan1@gmail.com>
Signed-off-by: Rob Herring <robh@kernel.org>
---
v2:
 - Make get_irq optional to avoid error message
---
 drivers/pci/controller/dwc/pci-dra7xx.c       |  3 +++
 drivers/pci/controller/dwc/pci-exynos.c       |  6 -----
 drivers/pci/controller/dwc/pci-imx6.c         |  6 -----
 drivers/pci/controller/dwc/pci-meson.c        |  6 -----
 drivers/pci/controller/dwc/pcie-artpec6.c     |  6 -----
 .../pci/controller/dwc/pcie-designware-host.c | 11 +++++++++-
 .../pci/controller/dwc/pcie-designware-plat.c |  6 -----
 drivers/pci/controller/dwc/pcie-histb.c       |  6 -----
 drivers/pci/controller/dwc/pcie-kirin.c       | 22 -------------------
 drivers/pci/controller/dwc/pcie-qcom.c        |  8 -------
 drivers/pci/controller/dwc/pcie-spear13xx.c   |  1 +
 drivers/pci/controller/dwc/pcie-tegra194.c    |  8 -------
 drivers/pci/controller/dwc/pcie-uniphier.c    |  6 -----
 13 files changed, 14 insertions(+), 81 deletions(-)

diff --git a/drivers/pci/controller/dwc/pci-dra7xx.c b/drivers/pci/controller/dwc/pci-dra7xx.c
index 4d0c35a4aa59..6b75c68dddb5 100644
--- a/drivers/pci/controller/dwc/pci-dra7xx.c
+++ b/drivers/pci/controller/dwc/pci-dra7xx.c
@@ -489,6 +489,9 @@ static int __init dra7xx_add_pcie_port(struct dra7xx_pcie *dra7xx,
 	if (pp->irq < 0)
 		return pp->irq;
 
+	/* MSI IRQ is muxed */
+	pp->msi_irq = -ENODEV;
+
 	ret = dra7xx_pcie_init_irq_domain(pp);
 	if (ret < 0)
 		return ret;
diff --git a/drivers/pci/controller/dwc/pci-exynos.c b/drivers/pci/controller/dwc/pci-exynos.c
index 242683cde04a..7734394953e5 100644
--- a/drivers/pci/controller/dwc/pci-exynos.c
+++ b/drivers/pci/controller/dwc/pci-exynos.c
@@ -415,12 +415,6 @@ static int __init exynos_add_pcie_port(struct exynos_pcie *ep,
 		return ret;
 	}
 
-	if (IS_ENABLED(CONFIG_PCI_MSI)) {
-		pp->msi_irq = platform_get_irq(pdev, 0);
-		if (pp->msi_irq < 0)
-			return pp->msi_irq;
-	}
-
 	pp->ops = &exynos_pcie_host_ops;
 
 	ret = dw_pcie_host_init(pp);
diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
index 5cf1ef12fb9b..95e7cf06863d 100644
--- a/drivers/pci/controller/dwc/pci-imx6.c
+++ b/drivers/pci/controller/dwc/pci-imx6.c
@@ -853,12 +853,6 @@ static int imx6_add_pcie_port(struct imx6_pcie *imx6_pcie,
 	struct device *dev = &pdev->dev;
 	int ret;
 
-	if (IS_ENABLED(CONFIG_PCI_MSI)) {
-		pp->msi_irq = platform_get_irq_byname(pdev, "msi");
-		if (pp->msi_irq < 0)
-			return pp->msi_irq;
-	}
-
 	pp->ops = &imx6_pcie_host_ops;
 
 	ret = dw_pcie_host_init(pp);
diff --git a/drivers/pci/controller/dwc/pci-meson.c b/drivers/pci/controller/dwc/pci-meson.c
index 1913dc2c8fa0..10d65b3093e4 100644
--- a/drivers/pci/controller/dwc/pci-meson.c
+++ b/drivers/pci/controller/dwc/pci-meson.c
@@ -405,12 +405,6 @@ static int meson_add_pcie_port(struct meson_pcie *mp,
 	struct device *dev = &pdev->dev;
 	int ret;
 
-	if (IS_ENABLED(CONFIG_PCI_MSI)) {
-		pp->msi_irq = platform_get_irq(pdev, 0);
-		if (pp->msi_irq < 0)
-			return pp->msi_irq;
-	}
-
 	pp->ops = &meson_pcie_host_ops;
 
 	ret = dw_pcie_host_init(pp);
diff --git a/drivers/pci/controller/dwc/pcie-artpec6.c b/drivers/pci/controller/dwc/pcie-artpec6.c
index 52ad7909cd0c..a5239a58cee0 100644
--- a/drivers/pci/controller/dwc/pcie-artpec6.c
+++ b/drivers/pci/controller/dwc/pcie-artpec6.c
@@ -348,12 +348,6 @@ static int artpec6_add_pcie_port(struct artpec6_pcie *artpec6_pcie,
 	struct device *dev = pci->dev;
 	int ret;
 
-	if (IS_ENABLED(CONFIG_PCI_MSI)) {
-		pp->msi_irq = platform_get_irq_byname(pdev, "msi");
-		if (pp->msi_irq < 0)
-			return pp->msi_irq;
-	}
-
 	pp->ops = &artpec6_pcie_host_ops;
 
 	ret = dw_pcie_host_init(pp);
diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index 1bd6a9762426..95deef0eaadf 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -373,13 +373,22 @@ int dw_pcie_host_init(struct pcie_port *pp)
 		}
 
 		if (!pp->ops->msi_host_init) {
+			if (!pp->msi_irq) {
+				pp->msi_irq = platform_get_irq_byname_optional(pdev, "msi");
+				if (pp->msi_irq < 0) {
+					pp->msi_irq = platform_get_irq(pdev, 0);
+					if (pp->msi_irq < 0)
+						return pp->msi_irq;
+				}
+			}
+
 			pp->msi_irq_chip = &dw_pci_msi_bottom_irq_chip;
 
 			ret = dw_pcie_allocate_domains(pp);
 			if (ret)
 				return ret;
 
-			if (pp->msi_irq)
+			if (pp->msi_irq > 0)
 				irq_set_chained_handler_and_data(pp->msi_irq,
 							    dw_chained_msi_isr,
 							    pp);
diff --git a/drivers/pci/controller/dwc/pcie-designware-plat.c b/drivers/pci/controller/dwc/pcie-designware-plat.c
index 13fede1d4157..3da38ac6a87a 100644
--- a/drivers/pci/controller/dwc/pcie-designware-plat.c
+++ b/drivers/pci/controller/dwc/pcie-designware-plat.c
@@ -116,12 +116,6 @@ static int dw_plat_add_pcie_port(struct dw_plat_pcie *dw_plat_pcie,
 	if (pp->irq < 0)
 		return pp->irq;
 
-	if (IS_ENABLED(CONFIG_PCI_MSI)) {
-		pp->msi_irq = platform_get_irq(pdev, 0);
-		if (pp->msi_irq < 0)
-			return pp->msi_irq;
-	}
-
 	pp->num_vectors = MAX_MSI_IRQS;
 	pp->ops = &dw_plat_pcie_host_ops;
 
diff --git a/drivers/pci/controller/dwc/pcie-histb.c b/drivers/pci/controller/dwc/pcie-histb.c
index afc1abbe49aa..777e24902afb 100644
--- a/drivers/pci/controller/dwc/pcie-histb.c
+++ b/drivers/pci/controller/dwc/pcie-histb.c
@@ -400,12 +400,6 @@ static int histb_pcie_probe(struct platform_device *pdev)
 		return PTR_ERR(hipcie->bus_reset);
 	}
 
-	if (IS_ENABLED(CONFIG_PCI_MSI)) {
-		pp->msi_irq = platform_get_irq_byname(pdev, "msi");
-		if (pp->msi_irq < 0)
-			return pp->msi_irq;
-	}
-
 	hipcie->phy = devm_phy_get(dev, "phy");
 	if (IS_ERR(hipcie->phy)) {
 		dev_info(dev, "no pcie-phy found\n");
diff --git a/drivers/pci/controller/dwc/pcie-kirin.c b/drivers/pci/controller/dwc/pcie-kirin.c
index 3042a23cf09a..ba03dbca7885 100644
--- a/drivers/pci/controller/dwc/pcie-kirin.c
+++ b/drivers/pci/controller/dwc/pcie-kirin.c
@@ -439,31 +439,9 @@ static const struct dw_pcie_host_ops kirin_pcie_host_ops = {
 	.host_init = kirin_pcie_host_init,
 };
 
-static int kirin_pcie_add_msi(struct dw_pcie *pci,
-				struct platform_device *pdev)
-{
-	int irq;
-
-	if (IS_ENABLED(CONFIG_PCI_MSI)) {
-		irq = platform_get_irq(pdev, 0);
-		if (irq < 0)
-			return irq;
-
-		pci->pp.msi_irq = irq;
-	}
-
-	return 0;
-}
-
 static int kirin_add_pcie_port(struct dw_pcie *pci,
 			       struct platform_device *pdev)
 {
-	int ret;
-
-	ret = kirin_pcie_add_msi(pci, pdev);
-	if (ret)
-		return ret;
-
 	pci->pp.ops = &kirin_pcie_host_ops;
 
 	return dw_pcie_host_init(&pci->pp);
diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index 3b4f70b9f3f0..7ac08f0cae17 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -1424,14 +1424,6 @@ static int qcom_pcie_probe(struct platform_device *pdev)
 
 	pp->ops = &qcom_pcie_dw_ops;
 
-	if (IS_ENABLED(CONFIG_PCI_MSI)) {
-		pp->msi_irq = platform_get_irq_byname(pdev, "msi");
-		if (pp->msi_irq < 0) {
-			ret = pp->msi_irq;
-			goto err_pm_runtime_put;
-		}
-	}
-
 	ret = phy_init(pcie->phy);
 	if (ret) {
 		pm_runtime_disable(&pdev->dev);
diff --git a/drivers/pci/controller/dwc/pcie-spear13xx.c b/drivers/pci/controller/dwc/pcie-spear13xx.c
index 1ed7e3501ff1..800c34a60a33 100644
--- a/drivers/pci/controller/dwc/pcie-spear13xx.c
+++ b/drivers/pci/controller/dwc/pcie-spear13xx.c
@@ -185,6 +185,7 @@ static int spear13xx_add_pcie_port(struct spear13xx_pcie *spear13xx_pcie,
 	}
 
 	pp->ops = &spear13xx_pcie_host_ops;
+	pp->msi_irq = -ENODEV;
 
 	ret = dw_pcie_host_init(pp);
 	if (ret) {
diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c
index 5e2841f58700..77fc3ba3dec1 100644
--- a/drivers/pci/controller/dwc/pcie-tegra194.c
+++ b/drivers/pci/controller/dwc/pcie-tegra194.c
@@ -1554,14 +1554,6 @@ static int tegra_pcie_config_rp(struct tegra_pcie_dw *pcie)
 	char *name;
 	int ret;
 
-	if (IS_ENABLED(CONFIG_PCI_MSI)) {
-		pp->msi_irq = of_irq_get_byname(dev->of_node, "msi");
-		if (!pp->msi_irq) {
-			dev_err(dev, "Failed to get MSI interrupt\n");
-			return -ENODEV;
-		}
-	}
-
 	pm_runtime_enable(dev);
 
 	ret = pm_runtime_get_sync(dev);
diff --git a/drivers/pci/controller/dwc/pcie-uniphier.c b/drivers/pci/controller/dwc/pcie-uniphier.c
index 33130fb4af90..6198bd106b8a 100644
--- a/drivers/pci/controller/dwc/pcie-uniphier.c
+++ b/drivers/pci/controller/dwc/pcie-uniphier.c
@@ -341,12 +341,6 @@ static int uniphier_add_pcie_port(struct uniphier_pcie_priv *priv,
 
 	pp->ops = &uniphier_pcie_host_ops;
 
-	if (IS_ENABLED(CONFIG_PCI_MSI)) {
-		pp->msi_irq = platform_get_irq_byname(pdev, "msi");
-		if (pp->msi_irq < 0)
-			return pp->msi_irq;
-	}
-
 	ret = dw_pcie_host_init(pp);
 	if (ret) {
 		dev_err(dev, "Failed to initialize host (%d)\n", ret);
-- 
2.25.1

[PATCH v2 09/16] PCI: dwc: Rework MSI initialization

[Rob Herring]

There are 3 possible MSI implementations for the DWC host. The first is
using the built-in DWC MSI controller. The 2nd is a custom MSI
controller as part of the PCI host (keystone only). The 3rd is an
external MSI controller (typically GICv3 ITS). Currently, the last 2
are distinguished with a .msi_host_init() hook with the 3rd option using
an empty function. However we can detect the 3rd case with the presence
of 'msi-parent' or 'msi-map' properties, so let's do that instead and
remove the empty functions.

Cc: Murali Karicheri <m-karicheri2@ti.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Minghuan Lian <minghuan.Lian@nxp.com>
Cc: Mingkai Hu <mingkai.hu@nxp.com>
Cc: Roy Zang <roy.zang@nxp.com>
Cc: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Cc: linuxppc-dev@lists.ozlabs.org
Acked-by: Jingoo Han <jingoohan1@gmail.com>
Signed-off-by: Rob Herring <robh@kernel.org>
---
 drivers/pci/controller/dwc/pci-keystone.c     |  9 -------
 drivers/pci/controller/dwc/pci-layerscape.c   | 25 -------------------
 .../pci/controller/dwc/pcie-designware-host.c | 20 +++++++++------
 drivers/pci/controller/dwc/pcie-designware.h  |  1 +
 drivers/pci/controller/dwc/pcie-intel-gw.c    |  9 -------
 5 files changed, 13 insertions(+), 51 deletions(-)

diff --git a/drivers/pci/controller/dwc/pci-keystone.c b/drivers/pci/controller/dwc/pci-keystone.c
index 9cf14f13798b..784385ae6074 100644
--- a/drivers/pci/controller/dwc/pci-keystone.c
+++ b/drivers/pci/controller/dwc/pci-keystone.c
@@ -272,14 +272,6 @@ static void ks_pcie_handle_legacy_irq(struct keystone_pcie *ks_pcie,
 	ks_pcie_app_writel(ks_pcie, IRQ_EOI, offset);
 }
 
-/*
- * Dummy function so that DW core doesn't configure MSI
- */
-static int ks_pcie_am654_msi_host_init(struct pcie_port *pp)
-{
-	return 0;
-}
-
 static void ks_pcie_enable_error_irq(struct keystone_pcie *ks_pcie)
 {
 	ks_pcie_app_writel(ks_pcie, ERR_IRQ_ENABLE_SET, ERR_IRQ_ALL);
@@ -854,7 +846,6 @@ static const struct dw_pcie_host_ops ks_pcie_host_ops = {
 
 static const struct dw_pcie_host_ops ks_pcie_am654_host_ops = {
 	.host_init = ks_pcie_host_init,
-	.msi_host_init = ks_pcie_am654_msi_host_init,
 };
 
 static irqreturn_t ks_pcie_err_irq_handler(int irq, void *priv)
diff --git a/drivers/pci/controller/dwc/pci-layerscape.c b/drivers/pci/controller/dwc/pci-layerscape.c
index 53e56d54c482..0d84986c4c16 100644
--- a/drivers/pci/controller/dwc/pci-layerscape.c
+++ b/drivers/pci/controller/dwc/pci-layerscape.c
@@ -168,37 +168,12 @@ static int ls1021_pcie_host_init(struct pcie_port *pp)
 	return ls_pcie_host_init(pp);
 }
 
-static int ls_pcie_msi_host_init(struct pcie_port *pp)
-{
-	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
-	struct device *dev = pci->dev;
-	struct device_node *np = dev->of_node;
-	struct device_node *msi_node;
-
-	/*
-	 * The MSI domain is set by the generic of_msi_configure().  This
-	 * .msi_host_init() function keeps us from doing the default MSI
-	 * domain setup in dw_pcie_host_init() and also enforces the
-	 * requirement that "msi-parent" exists.
-	 */
-	msi_node = of_parse_phandle(np, "msi-parent", 0);
-	if (!msi_node) {
-		dev_err(dev, "failed to find msi-parent\n");
-		return -EINVAL;
-	}
-
-	of_node_put(msi_node);
-	return 0;
-}
-
 static const struct dw_pcie_host_ops ls1021_pcie_host_ops = {
 	.host_init = ls1021_pcie_host_init,
-	.msi_host_init = ls_pcie_msi_host_init,
 };
 
 static const struct dw_pcie_host_ops ls_pcie_host_ops = {
 	.host_init = ls_pcie_host_init,
-	.msi_host_init = ls_pcie_msi_host_init,
 };
 
 static const struct dw_pcie_ops dw_ls1021_pcie_ops = {
diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index 95deef0eaadf..9b952639d020 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -365,6 +365,10 @@ int dw_pcie_host_init(struct pcie_port *pp)
 		pci->link_gen = of_pci_get_max_link_speed(np);
 
 	if (pci_msi_enabled()) {
+		pp->has_msi_ctrl = !(pp->ops->msi_host_init ||
+				     of_property_read_bool(np, "msi-parent") ||
+				     of_property_read_bool(np, "msi-map"));
+
 		if (!pp->num_vectors) {
 			pp->num_vectors = MSI_DEF_NUM_VECTORS;
 		} else if (pp->num_vectors > MAX_MSI_IRQS) {
@@ -372,7 +376,11 @@ int dw_pcie_host_init(struct pcie_port *pp)
 			return -EINVAL;
 		}
 
-		if (!pp->ops->msi_host_init) {
+		if (pp->ops->msi_host_init) {
+			ret = pp->ops->msi_host_init(pp);
+			if (ret < 0)
+				return ret;
+		} else if (pp->has_msi_ctrl) {
 			if (!pp->msi_irq) {
 				pp->msi_irq = platform_get_irq_byname_optional(pdev, "msi");
 				if (pp->msi_irq < 0) {
@@ -402,10 +410,6 @@ int dw_pcie_host_init(struct pcie_port *pp)
 				pp->msi_data = 0;
 				goto err_free_msi;
 			}
-		} else {
-			ret = pp->ops->msi_host_init(pp);
-			if (ret < 0)
-				return ret;
 		}
 	}
 
@@ -426,7 +430,7 @@ int dw_pcie_host_init(struct pcie_port *pp)
 		return 0;
 
 err_free_msi:
-	if (pci_msi_enabled() && !pp->ops->msi_host_init)
+	if (pp->has_msi_ctrl)
 		dw_pcie_free_msi(pp);
 	return ret;
 }
@@ -436,7 +440,7 @@ void dw_pcie_host_deinit(struct pcie_port *pp)
 {
 	pci_stop_root_bus(pp->bridge->bus);
 	pci_remove_root_bus(pp->bridge->bus);
-	if (pci_msi_enabled() && !pp->ops->msi_host_init)
+	if (pp->has_msi_ctrl)
 		dw_pcie_free_msi(pp);
 }
 EXPORT_SYMBOL_GPL(dw_pcie_host_deinit);
@@ -544,7 +548,7 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
 
 	dw_pcie_setup(pci);
 
-	if (pci_msi_enabled() && !pp->ops->msi_host_init) {
+	if (pp->has_msi_ctrl) {
 		num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL;
 
 		/* Initialize IRQ Status array */
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index 96382dcb2859..5d374bab10d1 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -175,6 +175,7 @@ struct dw_pcie_host_ops {
 };
 
 struct pcie_port {
+	bool			has_msi_ctrl:1;
 	u64			cfg0_base;
 	void __iomem		*va_cfg0_base;
 	u32			cfg0_size;
diff --git a/drivers/pci/controller/dwc/pcie-intel-gw.c b/drivers/pci/controller/dwc/pcie-intel-gw.c
index c562eb7454b1..292b9de86532 100644
--- a/drivers/pci/controller/dwc/pcie-intel-gw.c
+++ b/drivers/pci/controller/dwc/pcie-intel-gw.c
@@ -385,14 +385,6 @@ static int intel_pcie_rc_init(struct pcie_port *pp)
 	return intel_pcie_host_setup(lpp);
 }
 
-/*
- * Dummy function so that DW core doesn't configure MSI
- */
-static int intel_pcie_msi_init(struct pcie_port *pp)
-{
-	return 0;
-}
-
 static u64 intel_pcie_cpu_addr(struct dw_pcie *pcie, u64 cpu_addr)
 {
 	return cpu_addr + BUS_IATU_OFFSET;
@@ -404,7 +396,6 @@ static const struct dw_pcie_ops intel_pcie_ops = {
 
 static const struct dw_pcie_host_ops intel_pcie_dw_ops = {
 	.host_init =		intel_pcie_rc_init,
-	.msi_host_init =	intel_pcie_msi_init,
 };
 
 static const struct intel_pcie_soc pcie_data = {
-- 
2.25.1

[PATCH v2 10/16] PCI: dwc: Move link handling into common code

[Rob Herring]

All the DWC drivers do link setup and checks at roughly the same time.
Let's use the existing .start_link() hook (currently only used in EP
mode) and move the link handling to the core code.

The behavior for a link down was inconsistent as some drivers would fail
probe in that case while others succeed. Let's standardize this to
succeed as there are usecases where devices (and the link) appear later
even without hotplug. For example, a reconfigured FPGA device.

Cc: Kishon Vijay Abraham I <kishon@ti.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Kukjin Kim <kgene@kernel.org>
Cc: Krzysztof Kozlowski <krzk@kernel.org>
Cc: Richard Zhu <hongxing.zhu@nxp.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Pengutronix Kernel Team <kernel@pengutronix.de>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: NXP Linux Team <linux-imx@nxp.com>
Cc: Murali Karicheri <m-karicheri2@ti.com>
Cc: Yue Wang <yue.wang@Amlogic.com>
Cc: Kevin Hilman <khilman@baylibre.com>
Cc: Neil Armstrong <narmstrong@baylibre.com>
Cc: Jerome Brunet <jbrunet@baylibre.com>
Cc: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Cc: Jesper Nilsson <jesper.nilsson@axis.com>
Cc: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Cc: Xiaowei Song <songxiaowei@hisilicon.com>
Cc: Binghui Wang <wangbinghui@hisilicon.com>
Cc: Andy Gross <agross@kernel.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: Stanimir Varbanov <svarbanov@mm-sol.com>
Cc: Pratyush Anand <pratyush.anand@gmail.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Jonathan Hunter <jonathanh@nvidia.com>
Cc: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: linux-omap@vger.kernel.org
Cc: linux-samsung-soc@vger.kernel.org
Cc: linux-amlogic@lists.infradead.org
Cc: linux-arm-kernel@axis.com
Cc: linux-arm-msm@vger.kernel.org
Cc: linux-tegra@vger.kernel.org
Acked-by: Jingoo Han <jingoohan1@gmail.com>
Signed-off-by: Rob Herring <robh@kernel.org>
---
 drivers/pci/controller/dwc/pci-dra7xx.c       |  2 -
 drivers/pci/controller/dwc/pci-exynos.c       | 41 +++++++----------
 drivers/pci/controller/dwc/pci-imx6.c         |  9 ++--
 drivers/pci/controller/dwc/pci-keystone.c     |  9 ----
 drivers/pci/controller/dwc/pci-meson.c        | 24 ++++------
 drivers/pci/controller/dwc/pcie-armada8k.c    | 39 +++++++---------
 drivers/pci/controller/dwc/pcie-artpec6.c     |  2 -
 .../pci/controller/dwc/pcie-designware-host.c |  9 ++++
 .../pci/controller/dwc/pcie-designware-plat.c |  3 --
 drivers/pci/controller/dwc/pcie-histb.c       | 34 +++++++-------
 drivers/pci/controller/dwc/pcie-kirin.c       | 23 ++--------
 drivers/pci/controller/dwc/pcie-qcom.c        | 19 ++------
 drivers/pci/controller/dwc/pcie-spear13xx.c   | 46 ++++++++-----------
 drivers/pci/controller/dwc/pcie-tegra194.c    |  1 -
 drivers/pci/controller/dwc/pcie-uniphier.c    | 13 ++----
 15 files changed, 103 insertions(+), 171 deletions(-)

diff --git a/drivers/pci/controller/dwc/pci-dra7xx.c b/drivers/pci/controller/dwc/pci-dra7xx.c
index 6b75c68dddb5..054423d9646d 100644
--- a/drivers/pci/controller/dwc/pci-dra7xx.c
+++ b/drivers/pci/controller/dwc/pci-dra7xx.c
@@ -183,8 +183,6 @@ static int dra7xx_pcie_host_init(struct pcie_port *pp)
 
 	dw_pcie_setup_rc(pp);
 
-	dra7xx_pcie_establish_link(pci);
-	dw_pcie_wait_for_link(pci);
 	dw_pcie_msi_init(pp);
 	dra7xx_pcie_enable_interrupts(dra7xx);
 
diff --git a/drivers/pci/controller/dwc/pci-exynos.c b/drivers/pci/controller/dwc/pci-exynos.c
index 7734394953e5..6498b615c834 100644
--- a/drivers/pci/controller/dwc/pci-exynos.c
+++ b/drivers/pci/controller/dwc/pci-exynos.c
@@ -229,30 +229,9 @@ static void exynos_pcie_assert_reset(struct exynos_pcie *ep)
 				GPIOF_OUT_INIT_HIGH, "RESET");
 }
 
-static int exynos_pcie_establish_link(struct exynos_pcie *ep)
+static int exynos_pcie_start_link(struct dw_pcie *pci)
 {
-	struct dw_pcie *pci = ep->pci;
-	struct pcie_port *pp = &pci->pp;
-	struct device *dev = pci->dev;
-
-	if (dw_pcie_link_up(pci)) {
-		dev_err(dev, "Link already up\n");
-		return 0;
-	}
-
-	exynos_pcie_assert_core_reset(ep);
-
-	phy_reset(ep->phy);
-
-	exynos_pcie_writel(ep->mem_res->elbi_base, 1,
-			PCIE_PWR_RESET);
-
-	phy_power_on(ep->phy);
-	phy_init(ep->phy);
-
-	exynos_pcie_deassert_core_reset(ep);
-	dw_pcie_setup_rc(pp);
-	exynos_pcie_assert_reset(ep);
+	struct exynos_pcie *ep = to_exynos_pcie(pci);
 
 	/* assert LTSSM enable */
 	exynos_pcie_writel(ep->mem_res->elbi_base, PCIE_ELBI_LTSSM_ENABLE,
@@ -386,7 +365,20 @@ static int exynos_pcie_host_init(struct pcie_port *pp)
 
 	pp->bridge->ops = &exynos_pci_ops;
 
-	exynos_pcie_establish_link(ep);
+	exynos_pcie_assert_core_reset(ep);
+
+	phy_reset(ep->phy);
+
+	exynos_pcie_writel(ep->mem_res->elbi_base, 1,
+			PCIE_PWR_RESET);
+
+	phy_power_on(ep->phy);
+	phy_init(ep->phy);
+
+	exynos_pcie_deassert_core_reset(ep);
+	dw_pcie_setup_rc(pp);
+	exynos_pcie_assert_reset(ep);
+
 	exynos_pcie_enable_interrupts(ep);
 
 	return 0;
@@ -430,6 +422,7 @@ static const struct dw_pcie_ops dw_pcie_ops = {
 	.read_dbi = exynos_pcie_read_dbi,
 	.write_dbi = exynos_pcie_write_dbi,
 	.link_up = exynos_pcie_link_up,
+	.start_link = exynos_pcie_start_link,
 };
 
 static int __init exynos_pcie_probe(struct platform_device *pdev)
diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
index 95e7cf06863d..1fe8f3f2c380 100644
--- a/drivers/pci/controller/dwc/pci-imx6.c
+++ b/drivers/pci/controller/dwc/pci-imx6.c
@@ -745,9 +745,9 @@ static void imx6_pcie_ltssm_enable(struct device *dev)
 	}
 }
 
-static int imx6_pcie_establish_link(struct imx6_pcie *imx6_pcie)
+static int imx6_pcie_start_link(struct dw_pcie *pci)
 {
-	struct dw_pcie *pci = imx6_pcie->pci;
+	struct imx6_pcie *imx6_pcie = to_imx6_pcie(pci);
 	struct device *dev = pci->dev;
 	u8 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
 	u32 tmp;
@@ -835,7 +835,6 @@ static int imx6_pcie_host_init(struct pcie_port *pp)
 	imx6_pcie_deassert_core_reset(imx6_pcie);
 	imx6_setup_phy_mpll(imx6_pcie);
 	dw_pcie_setup_rc(pp);
-	imx6_pcie_establish_link(imx6_pcie);
 	dw_pcie_msi_init(pp);
 
 	return 0;
@@ -865,7 +864,7 @@ static int imx6_add_pcie_port(struct imx6_pcie *imx6_pcie,
 }
 
 static const struct dw_pcie_ops dw_pcie_ops = {
-	/* No special ops needed, but pcie-designware still expects this struct */
+	.start_link = imx6_pcie_start_link,
 };
 
 #ifdef CONFIG_PM_SLEEP
@@ -974,7 +973,7 @@ static int imx6_pcie_resume_noirq(struct device *dev)
 	imx6_pcie_deassert_core_reset(imx6_pcie);
 	dw_pcie_setup_rc(pp);
 
-	ret = imx6_pcie_establish_link(imx6_pcie);
+	ret = imx6_pcie_start_link(imx6_pcie->pci);
 	if (ret < 0)
 		dev_info(dev, "pcie link is down after resume.\n");
 
diff --git a/drivers/pci/controller/dwc/pci-keystone.c b/drivers/pci/controller/dwc/pci-keystone.c
index 784385ae6074..90b222b020a3 100644
--- a/drivers/pci/controller/dwc/pci-keystone.c
+++ b/drivers/pci/controller/dwc/pci-keystone.c
@@ -511,14 +511,8 @@ static void ks_pcie_stop_link(struct dw_pcie *pci)
 static int ks_pcie_start_link(struct dw_pcie *pci)
 {
 	struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
-	struct device *dev = pci->dev;
 	u32 val;
 
-	if (dw_pcie_link_up(pci)) {
-		dev_dbg(dev, "link is already up\n");
-		return 0;
-	}
-
 	/* Initiate Link Training */
 	val = ks_pcie_app_readl(ks_pcie, CMD_STATUS);
 	ks_pcie_app_writel(ks_pcie, CMD_STATUS, LTSSM_EN_VAL | val);
@@ -833,9 +827,6 @@ static int __init ks_pcie_host_init(struct pcie_port *pp)
 			"Asynchronous external abort");
 #endif
 
-	ks_pcie_start_link(pci);
-	dw_pcie_wait_for_link(pci);
-
 	return 0;
 }
 
diff --git a/drivers/pci/controller/dwc/pci-meson.c b/drivers/pci/controller/dwc/pci-meson.c
index 10d65b3093e4..41a3351b100b 100644
--- a/drivers/pci/controller/dwc/pci-meson.c
+++ b/drivers/pci/controller/dwc/pci-meson.c
@@ -231,7 +231,7 @@ static void meson_pcie_assert_reset(struct meson_pcie *mp)
 	gpiod_set_value_cansleep(mp->reset_gpio, 0);
 }
 
-static void meson_pcie_init_dw(struct meson_pcie *mp)
+static void meson_pcie_ltssm_enable(struct meson_pcie *mp)
 {
 	u32 val;
 
@@ -289,20 +289,14 @@ static void meson_set_max_rd_req_size(struct meson_pcie *mp, int size)
 	dw_pcie_writel_dbi(pci, offset + PCI_EXP_DEVCTL, val);
 }
 
-static int meson_pcie_establish_link(struct meson_pcie *mp)
+static int meson_pcie_start_link(struct dw_pcie *pci)
 {
-	struct dw_pcie *pci = &mp->pci;
-	struct pcie_port *pp = &pci->pp;
-
-	meson_pcie_init_dw(mp);
-	meson_set_max_payload(mp, MAX_PAYLOAD_SIZE);
-	meson_set_max_rd_req_size(mp, MAX_READ_REQ_SIZE);
-
-	dw_pcie_setup_rc(pp);
+	struct meson_pcie *mp = to_meson_pcie(pci);
 
+	meson_pcie_ltssm_enable(mp);
 	meson_pcie_assert_reset(mp);
 
-	return dw_pcie_wait_for_link(pci);
+	return 0;
 }
 
 static int meson_pcie_rd_own_conf(struct pci_bus *bus, u32 devfn,
@@ -380,14 +374,13 @@ static int meson_pcie_host_init(struct pcie_port *pp)
 {
 	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
 	struct meson_pcie *mp = to_meson_pcie(pci);
-	int ret;
 
 	pp->bridge->ops = &meson_pci_ops;
 
-	ret = meson_pcie_establish_link(mp);
-	if (ret)
-		return ret;
+	meson_set_max_payload(mp, MAX_PAYLOAD_SIZE);
+	meson_set_max_rd_req_size(mp, MAX_READ_REQ_SIZE);
 
+	dw_pcie_setup_rc(pp);
 	dw_pcie_msi_init(pp);
 
 	return 0;
@@ -418,6 +411,7 @@ static int meson_add_pcie_port(struct meson_pcie *mp,
 
 static const struct dw_pcie_ops dw_pcie_ops = {
 	.link_up = meson_pcie_link_up,
+	.start_link = meson_pcie_start_link,
 };
 
 static int meson_pcie_probe(struct platform_device *pdev)
diff --git a/drivers/pci/controller/dwc/pcie-armada8k.c b/drivers/pci/controller/dwc/pcie-armada8k.c
index 13901f359a41..dd2926bbb901 100644
--- a/drivers/pci/controller/dwc/pcie-armada8k.c
+++ b/drivers/pci/controller/dwc/pcie-armada8k.c
@@ -154,10 +154,24 @@ static int armada8k_pcie_link_up(struct dw_pcie *pci)
 	return 0;
 }
 
-static void armada8k_pcie_establish_link(struct armada8k_pcie *pcie)
+static int armada8k_pcie_start_link(struct dw_pcie *pci)
+{
+	u32 reg;
+
+	/* Start LTSSM */
+	reg = dw_pcie_readl_dbi(pci, PCIE_GLOBAL_CONTROL_REG);
+	reg |= PCIE_APP_LTSSM_EN;
+	dw_pcie_writel_dbi(pci, PCIE_GLOBAL_CONTROL_REG, reg);
+
+	return 0;
+}
+
+static int armada8k_pcie_host_init(struct pcie_port *pp)
 {
-	struct dw_pcie *pci = pcie->pci;
 	u32 reg;
+	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+
+	dw_pcie_setup_rc(pp);
 
 	if (!dw_pcie_link_up(pci)) {
 		/* Disable LTSSM state machine to enable configuration */
@@ -193,26 +207,6 @@ static void armada8k_pcie_establish_link(struct armada8k_pcie *pcie)
 	       PCIE_INT_C_ASSERT_MASK | PCIE_INT_D_ASSERT_MASK;
 	dw_pcie_writel_dbi(pci, PCIE_GLOBAL_INT_MASK1_REG, reg);
 
-	if (!dw_pcie_link_up(pci)) {
-		/* Configuration done. Start LTSSM */
-		reg = dw_pcie_readl_dbi(pci, PCIE_GLOBAL_CONTROL_REG);
-		reg |= PCIE_APP_LTSSM_EN;
-		dw_pcie_writel_dbi(pci, PCIE_GLOBAL_CONTROL_REG, reg);
-	}
-
-	/* Wait until the link becomes active again */
-	if (dw_pcie_wait_for_link(pci))
-		dev_err(pci->dev, "Link not up after reconfiguration\n");
-}
-
-static int armada8k_pcie_host_init(struct pcie_port *pp)
-{
-	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
-	struct armada8k_pcie *pcie = to_armada8k_pcie(pci);
-
-	dw_pcie_setup_rc(pp);
-	armada8k_pcie_establish_link(pcie);
-
 	return 0;
 }
 
@@ -269,6 +263,7 @@ static int armada8k_add_pcie_port(struct armada8k_pcie *pcie,
 
 static const struct dw_pcie_ops dw_pcie_ops = {
 	.link_up = armada8k_pcie_link_up,
+	.start_link = armada8k_pcie_start_link,
 };
 
 static int armada8k_pcie_probe(struct platform_device *pdev)
diff --git a/drivers/pci/controller/dwc/pcie-artpec6.c b/drivers/pci/controller/dwc/pcie-artpec6.c
index a5239a58cee0..8b3da3038ac3 100644
--- a/drivers/pci/controller/dwc/pcie-artpec6.c
+++ b/drivers/pci/controller/dwc/pcie-artpec6.c
@@ -329,8 +329,6 @@ static int artpec6_pcie_host_init(struct pcie_port *pp)
 	artpec6_pcie_deassert_core_reset(artpec6_pcie);
 	artpec6_pcie_wait_for_phy(artpec6_pcie);
 	dw_pcie_setup_rc(pp);
-	artpec6_pcie_establish_link(pci);
-	dw_pcie_wait_for_link(pci);
 	dw_pcie_msi_init(pp);
 
 	return 0;
diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index 9b952639d020..800e7a0415cf 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -423,6 +423,15 @@ int dw_pcie_host_init(struct pcie_port *pp)
 			goto err_free_msi;
 	}
 
+	if (!dw_pcie_link_up(pci) && pci->ops->start_link) {
+		ret = pci->ops->start_link(pci);
+		if (ret)
+			goto err_free_msi;
+	}
+
+	/* Ignore errors, the link may come up later */
+	dw_pcie_wait_for_link(pci);
+
 	bridge->sysdata = pp;
 
 	ret = pci_host_probe(bridge);
diff --git a/drivers/pci/controller/dwc/pcie-designware-plat.c b/drivers/pci/controller/dwc/pcie-designware-plat.c
index 3da38ac6a87a..adebcaeb1a6c 100644
--- a/drivers/pci/controller/dwc/pcie-designware-plat.c
+++ b/drivers/pci/controller/dwc/pcie-designware-plat.c
@@ -35,10 +35,7 @@ static const struct of_device_id dw_plat_pcie_of_match[];
 
 static int dw_plat_pcie_host_init(struct pcie_port *pp)
 {
-	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
-
 	dw_pcie_setup_rc(pp);
-	dw_pcie_wait_for_link(pci);
 	dw_pcie_msi_init(pp);
 
 	return 0;
diff --git a/drivers/pci/controller/dwc/pcie-histb.c b/drivers/pci/controller/dwc/pcie-histb.c
index 777e24902afb..ece544165059 100644
--- a/drivers/pci/controller/dwc/pcie-histb.c
+++ b/drivers/pci/controller/dwc/pcie-histb.c
@@ -169,39 +169,36 @@ static int histb_pcie_link_up(struct dw_pcie *pci)
 	return 0;
 }
 
-static int histb_pcie_establish_link(struct pcie_port *pp)
+static int histb_pcie_start_link(struct dw_pcie *pci)
 {
-	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
 	struct histb_pcie *hipcie = to_histb_pcie(pci);
 	u32 regval;
 
-	if (dw_pcie_link_up(pci)) {
-		dev_info(pci->dev, "Link already up\n");
-		return 0;
-	}
-
-	/* PCIe RC work mode */
-	regval = histb_pcie_readl(hipcie, PCIE_SYS_CTRL0);
-	regval &= ~PCIE_DEVICE_TYPE_MASK;
-	regval |= PCIE_WM_RC;
-	histb_pcie_writel(hipcie, PCIE_SYS_CTRL0, regval);
-
-	/* setup root complex */
-	dw_pcie_setup_rc(pp);
-
 	/* assert LTSSM enable */
 	regval = histb_pcie_readl(hipcie, PCIE_SYS_CTRL7);
 	regval |= PCIE_APP_LTSSM_ENABLE;
 	histb_pcie_writel(hipcie, PCIE_SYS_CTRL7, regval);
 
-	return dw_pcie_wait_for_link(pci);
+	return 0;
 }
 
 static int histb_pcie_host_init(struct pcie_port *pp)
 {
+	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+	struct histb_pcie *hipcie = to_histb_pcie(pci);
+	u32 regval;
+
 	pp->bridge->ops = &histb_pci_ops;
 
-	histb_pcie_establish_link(pp);
+	/* PCIe RC work mode */
+	regval = histb_pcie_readl(hipcie, PCIE_SYS_CTRL0);
+	regval &= ~PCIE_DEVICE_TYPE_MASK;
+	regval |= PCIE_WM_RC;
+	histb_pcie_writel(hipcie, PCIE_SYS_CTRL0, regval);
+
+	/* setup root complex */
+	dw_pcie_setup_rc(pp);
+
 	dw_pcie_msi_init(pp);
 
 	return 0;
@@ -300,6 +297,7 @@ static const struct dw_pcie_ops dw_pcie_ops = {
 	.read_dbi = histb_pcie_read_dbi,
 	.write_dbi = histb_pcie_write_dbi,
 	.link_up = histb_pcie_link_up,
+	.start_link = histb_pcie_start_link,
 };
 
 static int histb_pcie_probe(struct platform_device *pdev)
diff --git a/drivers/pci/controller/dwc/pcie-kirin.c b/drivers/pci/controller/dwc/pcie-kirin.c
index ba03dbca7885..675b4d8392d3 100644
--- a/drivers/pci/controller/dwc/pcie-kirin.c
+++ b/drivers/pci/controller/dwc/pcie-kirin.c
@@ -390,32 +390,14 @@ static int kirin_pcie_link_up(struct dw_pcie *pci)
 	return 0;
 }
 
-static int kirin_pcie_establish_link(struct pcie_port *pp)
+static int kirin_pcie_start_link(struct dw_pcie *pci)
 {
-	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
 	struct kirin_pcie *kirin_pcie = to_kirin_pcie(pci);
-	struct device *dev = kirin_pcie->pci->dev;
-	int count = 0;
-
-	if (kirin_pcie_link_up(pci))
-		return 0;
-
-	dw_pcie_setup_rc(pp);
 
 	/* assert LTSSM enable */
 	kirin_apb_ctrl_writel(kirin_pcie, PCIE_LTSSM_ENABLE_BIT,
 			      PCIE_APP_LTSSM_ENABLE);
 
-	/* check if the link is up or not */
-	while (!kirin_pcie_link_up(pci)) {
-		usleep_range(LINK_WAIT_MIN, LINK_WAIT_MAX);
-		count++;
-		if (count == 1000) {
-			dev_err(dev, "Link Fail\n");
-			return -EINVAL;
-		}
-	}
-
 	return 0;
 }
 
@@ -423,7 +405,7 @@ static int kirin_pcie_host_init(struct pcie_port *pp)
 {
 	pp->bridge->ops = &kirin_pci_ops;
 
-	kirin_pcie_establish_link(pp);
+	dw_pcie_setup_rc(pp);
 	dw_pcie_msi_init(pp);
 
 	return 0;
@@ -433,6 +415,7 @@ static const struct dw_pcie_ops kirin_dw_pcie_ops = {
 	.read_dbi = kirin_pcie_read_dbi,
 	.write_dbi = kirin_pcie_write_dbi,
 	.link_up = kirin_pcie_link_up,
+	.start_link = kirin_pcie_start_link,
 };
 
 static const struct dw_pcie_host_ops kirin_pcie_host_ops = {
diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index 7ac08f0cae17..8eb8ac2fb270 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -207,18 +207,15 @@ static void qcom_ep_reset_deassert(struct qcom_pcie *pcie)
 	usleep_range(PERST_DELAY_US, PERST_DELAY_US + 500);
 }
 
-static int qcom_pcie_establish_link(struct qcom_pcie *pcie)
+static int qcom_pcie_start_link(struct dw_pcie *pci)
 {
-	struct dw_pcie *pci = pcie->pci;
-
-	if (dw_pcie_link_up(pci))
-		return 0;
+	struct qcom_pcie *pcie = to_qcom_pcie(pci);
 
 	/* Enable Link Training state machine */
 	if (pcie->ops->ltssm_enable)
 		pcie->ops->ltssm_enable(pcie);
 
-	return dw_pcie_wait_for_link(pci);
+	return 0;
 }
 
 static void qcom_pcie_2_1_0_ltssm_enable(struct qcom_pcie *pcie)
@@ -1288,15 +1285,8 @@ static int qcom_pcie_host_init(struct pcie_port *pp)
 
 	qcom_ep_reset_deassert(pcie);
 
-	ret = qcom_pcie_establish_link(pcie);
-	if (ret)
-		goto err;
-
 	return 0;
-err:
-	qcom_ep_reset_assert(pcie);
-	if (pcie->ops->post_deinit)
-		pcie->ops->post_deinit(pcie);
+
 err_disable_phy:
 	phy_power_off(pcie->phy);
 err_deinit:
@@ -1363,6 +1353,7 @@ static const struct qcom_pcie_ops ops_2_7_0 = {
 
 static const struct dw_pcie_ops dw_pcie_ops = {
 	.link_up = qcom_pcie_link_up,
+	.start_link = qcom_pcie_start_link,
 };
 
 static int qcom_pcie_probe(struct platform_device *pdev)
diff --git a/drivers/pci/controller/dwc/pcie-spear13xx.c b/drivers/pci/controller/dwc/pcie-spear13xx.c
index 800c34a60a33..ebbaa06fc8ab 100644
--- a/drivers/pci/controller/dwc/pcie-spear13xx.c
+++ b/drivers/pci/controller/dwc/pcie-spear13xx.c
@@ -66,32 +66,10 @@ struct pcie_app_reg {
 
 #define to_spear13xx_pcie(x)	dev_get_drvdata((x)->dev)
 
-static int spear13xx_pcie_establish_link(struct spear13xx_pcie *spear13xx_pcie)
+static int spear13xx_pcie_start_link(struct dw_pcie *pci)
 {
-	struct dw_pcie *pci = spear13xx_pcie->pci;
-	struct pcie_port *pp = &pci->pp;
+	struct spear13xx_pcie *spear13xx_pcie = to_spear13xx_pcie(pci);
 	struct pcie_app_reg *app_reg = spear13xx_pcie->app_base;
-	u32 val;
-	u32 exp_cap_off = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
-
-	if (dw_pcie_link_up(pci)) {
-		dev_err(pci->dev, "link already up\n");
-		return 0;
-	}
-
-	dw_pcie_setup_rc(pp);
-
-	/*
-	 * this controller support only 128 bytes read size, however its
-	 * default value in capability register is 512 bytes. So force
-	 * it to 128 here.
-	 */
-	val = dw_pcie_readw_dbi(pci, exp_cap_off + PCI_EXP_DEVCTL);
-	val &= ~PCI_EXP_DEVCTL_READRQ;
-	dw_pcie_writew_dbi(pci, exp_cap_off + PCI_EXP_DEVCTL, val);
-
-	dw_pcie_writew_dbi(pci, PCI_VENDOR_ID, 0x104A);
-	dw_pcie_writew_dbi(pci, PCI_DEVICE_ID, 0xCD80);
 
 	/* enable ltssm */
 	writel(DEVICE_TYPE_RC | (1 << MISCTRL_EN_ID)
@@ -99,7 +77,7 @@ static int spear13xx_pcie_establish_link(struct spear13xx_pcie *spear13xx_pcie)
 			| ((u32)1 << REG_TRANSLATION_ENABLE),
 			&app_reg->app_ctrl_0);
 
-	return dw_pcie_wait_for_link(pci);
+	return 0;
 }
 
 static irqreturn_t spear13xx_pcie_irq_handler(int irq, void *arg)
@@ -151,10 +129,25 @@ static int spear13xx_pcie_host_init(struct pcie_port *pp)
 {
 	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
 	struct spear13xx_pcie *spear13xx_pcie = to_spear13xx_pcie(pci);
+	u32 exp_cap_off = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
+	u32 val;
 
 	spear13xx_pcie->app_base = pci->dbi_base + 0x2000;
 
-	spear13xx_pcie_establish_link(spear13xx_pcie);
+	dw_pcie_setup_rc(pp);
+
+	/*
+	 * this controller support only 128 bytes read size, however its
+	 * default value in capability register is 512 bytes. So force
+	 * it to 128 here.
+	 */
+	val = dw_pcie_readw_dbi(pci, exp_cap_off + PCI_EXP_DEVCTL);
+	val &= ~PCI_EXP_DEVCTL_READRQ;
+	dw_pcie_writew_dbi(pci, exp_cap_off + PCI_EXP_DEVCTL, val);
+
+	dw_pcie_writew_dbi(pci, PCI_VENDOR_ID, 0x104A);
+	dw_pcie_writew_dbi(pci, PCI_DEVICE_ID, 0xCD80);
+
 	spear13xx_pcie_enable_interrupts(spear13xx_pcie);
 
 	return 0;
@@ -198,6 +191,7 @@ static int spear13xx_add_pcie_port(struct spear13xx_pcie *spear13xx_pcie,
 
 static const struct dw_pcie_ops dw_pcie_ops = {
 	.link_up = spear13xx_pcie_link_up,
+	.start_link = spear13xx_pcie_start_link,
 };
 
 static int spear13xx_pcie_probe(struct platform_device *pdev)
diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c
index 77fc3ba3dec1..f7d7b002a06d 100644
--- a/drivers/pci/controller/dwc/pcie-tegra194.c
+++ b/drivers/pci/controller/dwc/pcie-tegra194.c
@@ -1549,7 +1549,6 @@ static int tegra_pcie_deinit_controller(struct tegra_pcie_dw *pcie)
 
 static int tegra_pcie_config_rp(struct tegra_pcie_dw *pcie)
 {
-	struct pcie_port *pp = &pcie->pci.pp;
 	struct device *dev = pcie->dev;
 	char *name;
 	int ret;
diff --git a/drivers/pci/controller/dwc/pcie-uniphier.c b/drivers/pci/controller/dwc/pcie-uniphier.c
index 6198bd106b8a..f4b776e231d6 100644
--- a/drivers/pci/controller/dwc/pcie-uniphier.c
+++ b/drivers/pci/controller/dwc/pcie-uniphier.c
@@ -146,16 +146,13 @@ static int uniphier_pcie_link_up(struct dw_pcie *pci)
 	return (val & mask) == mask;
 }
 
-static int uniphier_pcie_establish_link(struct dw_pcie *pci)
+static int uniphier_pcie_start_link(struct dw_pcie *pci)
 {
 	struct uniphier_pcie_priv *priv = to_uniphier_pcie(pci);
 
-	if (dw_pcie_link_up(pci))
-		return 0;
-
 	uniphier_pcie_ltssm_enable(priv, true);
 
-	return dw_pcie_wait_for_link(pci);
+	return 0;
 }
 
 static void uniphier_pcie_stop_link(struct dw_pcie *pci)
@@ -318,10 +315,6 @@ static int uniphier_pcie_host_init(struct pcie_port *pp)
 	uniphier_pcie_irq_enable(priv);
 
 	dw_pcie_setup_rc(pp);
-	ret = uniphier_pcie_establish_link(pci);
-	if (ret)
-		return ret;
-
 	dw_pcie_msi_init(pp);
 
 	return 0;
@@ -385,7 +378,7 @@ static int uniphier_pcie_host_enable(struct uniphier_pcie_priv *priv)
 }
 
 static const struct dw_pcie_ops dw_pcie_ops = {
-	.start_link = uniphier_pcie_establish_link,
+	.start_link = uniphier_pcie_start_link,
 	.stop_link = uniphier_pcie_stop_link,
 	.link_up = uniphier_pcie_link_up,
 };
-- 
2.25.1

[PATCH v2 11/16] PCI: dwc: Move dw_pcie_msi_init() into core

[Rob Herring]

The host drivers which call dw_pcie_msi_init() are all the ones using
the built-in MSI controller, so let's move it into the common DWC code.

Cc: Kishon Vijay Abraham I <kishon@ti.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Kukjin Kim <kgene@kernel.org>
Cc: Krzysztof Kozlowski <krzk@kernel.org>
Cc: Richard Zhu <hongxing.zhu@nxp.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Pengutronix Kernel Team <kernel@pengutronix.de>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: NXP Linux Team <linux-imx@nxp.com>
Cc: Yue Wang <yue.wang@Amlogic.com>
Cc: Kevin Hilman <khilman@baylibre.com>
Cc: Neil Armstrong <narmstrong@baylibre.com>
Cc: Jerome Brunet <jbrunet@baylibre.com>
Cc: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Cc: Jesper Nilsson <jesper.nilsson@axis.com>
Cc: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Cc: Xiaowei Song <songxiaowei@hisilicon.com>
Cc: Binghui Wang <wangbinghui@hisilicon.com>
Cc: Stanimir Varbanov <svarbanov@mm-sol.com>
Cc: Andy Gross <agross@kernel.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: Pratyush Anand <pratyush.anand@gmail.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Jonathan Hunter <jonathanh@nvidia.com>
Cc: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: linux-omap@vger.kernel.org
Cc: linux-samsung-soc@vger.kernel.org
Cc: linux-amlogic@lists.infradead.org
Cc: linux-arm-kernel@axis.com
Cc: linux-arm-msm@vger.kernel.org
Cc: linux-tegra@vger.kernel.org
Acked-by: Jingoo Han <jingoohan1@gmail.com>
Signed-off-by: Rob Herring <robh@kernel.org>
---
v2:
 - Drop now static dw_pcie_msi_init symbol export
---
 drivers/pci/controller/dwc/pci-dra7xx.c           |  2 --
 drivers/pci/controller/dwc/pci-exynos.c           |  4 ----
 drivers/pci/controller/dwc/pci-imx6.c             |  1 -
 drivers/pci/controller/dwc/pci-meson.c            |  1 -
 drivers/pci/controller/dwc/pcie-artpec6.c         |  1 -
 drivers/pci/controller/dwc/pcie-designware-host.c |  9 +++++----
 drivers/pci/controller/dwc/pcie-designware-plat.c |  1 -
 drivers/pci/controller/dwc/pcie-designware.h      | 10 ----------
 drivers/pci/controller/dwc/pcie-histb.c           |  2 --
 drivers/pci/controller/dwc/pcie-kirin.c           |  1 -
 drivers/pci/controller/dwc/pcie-qcom.c            |  2 --
 drivers/pci/controller/dwc/pcie-spear13xx.c       |  6 +-----
 drivers/pci/controller/dwc/pcie-tegra194.c        |  2 --
 drivers/pci/controller/dwc/pcie-uniphier.c        |  1 -
 14 files changed, 6 insertions(+), 37 deletions(-)

diff --git a/drivers/pci/controller/dwc/pci-dra7xx.c b/drivers/pci/controller/dwc/pci-dra7xx.c
index 054423d9646d..72a5a2bf933b 100644
--- a/drivers/pci/controller/dwc/pci-dra7xx.c
+++ b/drivers/pci/controller/dwc/pci-dra7xx.c
@@ -182,8 +182,6 @@ static int dra7xx_pcie_host_init(struct pcie_port *pp)
 	struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pci);
 
 	dw_pcie_setup_rc(pp);
-
-	dw_pcie_msi_init(pp);
 	dra7xx_pcie_enable_interrupts(dra7xx);
 
 	return 0;
diff --git a/drivers/pci/controller/dwc/pci-exynos.c b/drivers/pci/controller/dwc/pci-exynos.c
index 6498b615c834..3939fe22e8a2 100644
--- a/drivers/pci/controller/dwc/pci-exynos.c
+++ b/drivers/pci/controller/dwc/pci-exynos.c
@@ -273,12 +273,8 @@ static irqreturn_t exynos_pcie_irq_handler(int irq, void *arg)
 
 static void exynos_pcie_msi_init(struct exynos_pcie *ep)
 {
-	struct dw_pcie *pci = ep->pci;
-	struct pcie_port *pp = &pci->pp;
 	u32 val;
 
-	dw_pcie_msi_init(pp);
-
 	/* enable MSI interrupt */
 	val = exynos_pcie_readl(ep->mem_res->elbi_base, PCIE_IRQ_EN_LEVEL);
 	val |= IRQ_MSI_ENABLE;
diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
index 1fe8f3f2c380..9e30fbf4efbe 100644
--- a/drivers/pci/controller/dwc/pci-imx6.c
+++ b/drivers/pci/controller/dwc/pci-imx6.c
@@ -835,7 +835,6 @@ static int imx6_pcie_host_init(struct pcie_port *pp)
 	imx6_pcie_deassert_core_reset(imx6_pcie);
 	imx6_setup_phy_mpll(imx6_pcie);
 	dw_pcie_setup_rc(pp);
-	dw_pcie_msi_init(pp);
 
 	return 0;
 }
diff --git a/drivers/pci/controller/dwc/pci-meson.c b/drivers/pci/controller/dwc/pci-meson.c
index 41a3351b100b..2df0adcf0bf2 100644
--- a/drivers/pci/controller/dwc/pci-meson.c
+++ b/drivers/pci/controller/dwc/pci-meson.c
@@ -381,7 +381,6 @@ static int meson_pcie_host_init(struct pcie_port *pp)
 	meson_set_max_rd_req_size(mp, MAX_READ_REQ_SIZE);
 
 	dw_pcie_setup_rc(pp);
-	dw_pcie_msi_init(pp);
 
 	return 0;
 }
diff --git a/drivers/pci/controller/dwc/pcie-artpec6.c b/drivers/pci/controller/dwc/pcie-artpec6.c
index 8b3da3038ac3..7ee8f3c83f8f 100644
--- a/drivers/pci/controller/dwc/pcie-artpec6.c
+++ b/drivers/pci/controller/dwc/pcie-artpec6.c
@@ -329,7 +329,6 @@ static int artpec6_pcie_host_init(struct pcie_port *pp)
 	artpec6_pcie_deassert_core_reset(artpec6_pcie);
 	artpec6_pcie_wait_for_phy(artpec6_pcie);
 	dw_pcie_setup_rc(pp);
-	dw_pcie_msi_init(pp);
 
 	return 0;
 }
diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index 800e7a0415cf..ebea2c814448 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -256,7 +256,7 @@ int dw_pcie_allocate_domains(struct pcie_port *pp)
 	return 0;
 }
 
-void dw_pcie_free_msi(struct pcie_port *pp)
+static void dw_pcie_free_msi(struct pcie_port *pp)
 {
 	if (pp->msi_irq) {
 		irq_set_chained_handler(pp->msi_irq, NULL);
@@ -275,19 +275,18 @@ void dw_pcie_free_msi(struct pcie_port *pp)
 	}
 }
 
-void dw_pcie_msi_init(struct pcie_port *pp)
+static void dw_pcie_msi_init(struct pcie_port *pp)
 {
 	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
 	u64 msi_target = (u64)pp->msi_data;
 
-	if (!IS_ENABLED(CONFIG_PCI_MSI))
+	if (!pci_msi_enabled() || !pp->has_msi_ctrl)
 		return;
 
 	/* Program the msi_data */
 	dw_pcie_writel_dbi(pci, PCIE_MSI_ADDR_LO, lower_32_bits(msi_target));
 	dw_pcie_writel_dbi(pci, PCIE_MSI_ADDR_HI, upper_32_bits(msi_target));
 }
-EXPORT_SYMBOL_GPL(dw_pcie_msi_init);
 
 int dw_pcie_host_init(struct pcie_port *pp)
 {
@@ -423,6 +422,8 @@ int dw_pcie_host_init(struct pcie_port *pp)
 			goto err_free_msi;
 	}
 
+	dw_pcie_msi_init(pp);
+
 	if (!dw_pcie_link_up(pci) && pci->ops->start_link) {
 		ret = pci->ops->start_link(pci);
 		if (ret)
diff --git a/drivers/pci/controller/dwc/pcie-designware-plat.c b/drivers/pci/controller/dwc/pcie-designware-plat.c
index adebcaeb1a6c..dec24e595c3e 100644
--- a/drivers/pci/controller/dwc/pcie-designware-plat.c
+++ b/drivers/pci/controller/dwc/pcie-designware-plat.c
@@ -36,7 +36,6 @@ static const struct of_device_id dw_plat_pcie_of_match[];
 static int dw_plat_pcie_host_init(struct pcie_port *pp)
 {
 	dw_pcie_setup_rc(pp);
-	dw_pcie_msi_init(pp);
 
 	return 0;
 }
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index 5d374bab10d1..57326aebc6e1 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -363,8 +363,6 @@ static inline void dw_pcie_dbi_ro_wr_dis(struct dw_pcie *pci)
 
 #ifdef CONFIG_PCIE_DW_HOST
 irqreturn_t dw_handle_msi_irq(struct pcie_port *pp);
-void dw_pcie_msi_init(struct pcie_port *pp);
-void dw_pcie_free_msi(struct pcie_port *pp);
 void dw_pcie_setup_rc(struct pcie_port *pp);
 int dw_pcie_host_init(struct pcie_port *pp);
 void dw_pcie_host_deinit(struct pcie_port *pp);
@@ -377,14 +375,6 @@ static inline irqreturn_t dw_handle_msi_irq(struct pcie_port *pp)
 	return IRQ_NONE;
 }
 
-static inline void dw_pcie_msi_init(struct pcie_port *pp)
-{
-}
-
-static inline void dw_pcie_free_msi(struct pcie_port *pp)
-{
-}
-
 static inline void dw_pcie_setup_rc(struct pcie_port *pp)
 {
 }
diff --git a/drivers/pci/controller/dwc/pcie-histb.c b/drivers/pci/controller/dwc/pcie-histb.c
index ece544165059..210777c793ea 100644
--- a/drivers/pci/controller/dwc/pcie-histb.c
+++ b/drivers/pci/controller/dwc/pcie-histb.c
@@ -199,8 +199,6 @@ static int histb_pcie_host_init(struct pcie_port *pp)
 	/* setup root complex */
 	dw_pcie_setup_rc(pp);
 
-	dw_pcie_msi_init(pp);
-
 	return 0;
 }
 
diff --git a/drivers/pci/controller/dwc/pcie-kirin.c b/drivers/pci/controller/dwc/pcie-kirin.c
index 675b4d8392d3..f84ac1b36b2c 100644
--- a/drivers/pci/controller/dwc/pcie-kirin.c
+++ b/drivers/pci/controller/dwc/pcie-kirin.c
@@ -406,7 +406,6 @@ static int kirin_pcie_host_init(struct pcie_port *pp)
 	pp->bridge->ops = &kirin_pci_ops;
 
 	dw_pcie_setup_rc(pp);
-	dw_pcie_msi_init(pp);
 
 	return 0;
 }
diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index 8eb8ac2fb270..eb107179d544 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -1281,8 +1281,6 @@ static int qcom_pcie_host_init(struct pcie_port *pp)
 	}
 
 	dw_pcie_setup_rc(pp);
-	dw_pcie_msi_init(pp);
-
 	qcom_ep_reset_deassert(pcie);
 
 	return 0;
diff --git a/drivers/pci/controller/dwc/pcie-spear13xx.c b/drivers/pci/controller/dwc/pcie-spear13xx.c
index ebbaa06fc8ab..31475e4493a7 100644
--- a/drivers/pci/controller/dwc/pcie-spear13xx.c
+++ b/drivers/pci/controller/dwc/pcie-spear13xx.c
@@ -102,16 +102,12 @@ static irqreturn_t spear13xx_pcie_irq_handler(int irq, void *arg)
 
 static void spear13xx_pcie_enable_interrupts(struct spear13xx_pcie *spear13xx_pcie)
 {
-	struct dw_pcie *pci = spear13xx_pcie->pci;
-	struct pcie_port *pp = &pci->pp;
 	struct pcie_app_reg *app_reg = spear13xx_pcie->app_base;
 
 	/* Enable MSI interrupt */
-	if (IS_ENABLED(CONFIG_PCI_MSI)) {
-		dw_pcie_msi_init(pp);
+	if (IS_ENABLED(CONFIG_PCI_MSI))
 		writel(readl(&app_reg->int_mask) |
 				MSI_CTRL_INT, &app_reg->int_mask);
-	}
 }
 
 static int spear13xx_pcie_link_up(struct dw_pcie *pci)
diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c
index f7d7b002a06d..84f3e0bb4c7a 100644
--- a/drivers/pci/controller/dwc/pcie-tegra194.c
+++ b/drivers/pci/controller/dwc/pcie-tegra194.c
@@ -765,8 +765,6 @@ static void tegra_pcie_enable_msi_interrupts(struct pcie_port *pp)
 	struct tegra_pcie_dw *pcie = to_tegra_pcie(pci);
 	u32 val;
 
-	dw_pcie_msi_init(pp);
-
 	/* Enable MSI interrupt generation */
 	val = appl_readl(pcie, APPL_INTR_EN_L0_0);
 	val |= APPL_INTR_EN_L0_0_SYS_MSI_INTR_EN;
diff --git a/drivers/pci/controller/dwc/pcie-uniphier.c b/drivers/pci/controller/dwc/pcie-uniphier.c
index f4b776e231d6..e6616408a29c 100644
--- a/drivers/pci/controller/dwc/pcie-uniphier.c
+++ b/drivers/pci/controller/dwc/pcie-uniphier.c
@@ -315,7 +315,6 @@ static int uniphier_pcie_host_init(struct pcie_port *pp)
 	uniphier_pcie_irq_enable(priv);
 
 	dw_pcie_setup_rc(pp);
-	dw_pcie_msi_init(pp);
 
 	return 0;
 }
-- 
2.25.1

[PATCH v2 12/16] PCI: dwc: Move dw_pcie_setup_rc() to DWC common code

[Rob Herring]

All RC complex drivers must call dw_pcie_setup_rc(). The ordering of the
call shouldn't be too important other than being after any RC resets.

There's a few calls of dw_pcie_setup_rc() left as drivers implementing
suspend/resume need it.

Cc: Kishon Vijay Abraham I <kishon@ti.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Kukjin Kim <kgene@kernel.org>
Cc: Krzysztof Kozlowski <krzk@kernel.org>
Cc: Richard Zhu <hongxing.zhu@nxp.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Pengutronix Kernel Team <kernel@pengutronix.de>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: NXP Linux Team <linux-imx@nxp.com>
Cc: Murali Karicheri <m-karicheri2@ti.com>
Cc: Minghuan Lian <minghuan.Lian@nxp.com>
Cc: Mingkai Hu <mingkai.hu@nxp.com>
Cc: Roy Zang <roy.zang@nxp.com>
Cc: Yue Wang <yue.wang@Amlogic.com>
Cc: Kevin Hilman <khilman@baylibre.com>
Cc: Neil Armstrong <narmstrong@baylibre.com>
Cc: Jerome Brunet <jbrunet@baylibre.com>
Cc: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Cc: Jesper Nilsson <jesper.nilsson@axis.com>
Cc: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Cc: Xiaowei Song <songxiaowei@hisilicon.com>
Cc: Binghui Wang <wangbinghui@hisilicon.com>
Cc: Andy Gross <agross@kernel.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: Stanimir Varbanov <svarbanov@mm-sol.com>
Cc: Pratyush Anand <pratyush.anand@gmail.com>
Cc: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: linux-omap@vger.kernel.org
Cc: linux-samsung-soc@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-amlogic@lists.infradead.org
Cc: linux-arm-kernel@axis.com
Cc: linux-arm-msm@vger.kernel.org
Acked-by: Jingoo Han <jingoohan1@gmail.com>
Signed-off-by: Rob Herring <robh@kernel.org>
---
 drivers/pci/controller/dwc/pci-dra7xx.c           | 1 -
 drivers/pci/controller/dwc/pci-exynos.c           | 1 -
 drivers/pci/controller/dwc/pci-imx6.c             | 1 -
 drivers/pci/controller/dwc/pci-keystone.c         | 2 --
 drivers/pci/controller/dwc/pci-layerscape.c       | 2 --
 drivers/pci/controller/dwc/pci-meson.c            | 2 --
 drivers/pci/controller/dwc/pcie-armada8k.c        | 2 --
 drivers/pci/controller/dwc/pcie-artpec6.c         | 1 -
 drivers/pci/controller/dwc/pcie-designware-host.c | 1 +
 drivers/pci/controller/dwc/pcie-designware-plat.c | 8 --------
 drivers/pci/controller/dwc/pcie-histb.c           | 3 ---
 drivers/pci/controller/dwc/pcie-kirin.c           | 2 --
 drivers/pci/controller/dwc/pcie-qcom.c            | 1 -
 drivers/pci/controller/dwc/pcie-spear13xx.c       | 2 --
 drivers/pci/controller/dwc/pcie-uniphier.c        | 2 --
 15 files changed, 1 insertion(+), 30 deletions(-)

diff --git a/drivers/pci/controller/dwc/pci-dra7xx.c b/drivers/pci/controller/dwc/pci-dra7xx.c
index 72a5a2bf933b..b105af63854a 100644
--- a/drivers/pci/controller/dwc/pci-dra7xx.c
+++ b/drivers/pci/controller/dwc/pci-dra7xx.c
@@ -181,7 +181,6 @@ static int dra7xx_pcie_host_init(struct pcie_port *pp)
 	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
 	struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pci);
 
-	dw_pcie_setup_rc(pp);
 	dra7xx_pcie_enable_interrupts(dra7xx);
 
 	return 0;
diff --git a/drivers/pci/controller/dwc/pci-exynos.c b/drivers/pci/controller/dwc/pci-exynos.c
index 3939fe22e8a2..5c10a5432896 100644
--- a/drivers/pci/controller/dwc/pci-exynos.c
+++ b/drivers/pci/controller/dwc/pci-exynos.c
@@ -372,7 +372,6 @@ static int exynos_pcie_host_init(struct pcie_port *pp)
 	phy_init(ep->phy);
 
 	exynos_pcie_deassert_core_reset(ep);
-	dw_pcie_setup_rc(pp);
 	exynos_pcie_assert_reset(ep);
 
 	exynos_pcie_enable_interrupts(ep);
diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
index 9e30fbf4efbe..f9547bb2cf1b 100644
--- a/drivers/pci/controller/dwc/pci-imx6.c
+++ b/drivers/pci/controller/dwc/pci-imx6.c
@@ -834,7 +834,6 @@ static int imx6_pcie_host_init(struct pcie_port *pp)
 	imx6_pcie_init_phy(imx6_pcie);
 	imx6_pcie_deassert_core_reset(imx6_pcie);
 	imx6_setup_phy_mpll(imx6_pcie);
-	dw_pcie_setup_rc(pp);
 
 	return 0;
 }
diff --git a/drivers/pci/controller/dwc/pci-keystone.c b/drivers/pci/controller/dwc/pci-keystone.c
index 90b222b020a3..5a4bcc2b1ddb 100644
--- a/drivers/pci/controller/dwc/pci-keystone.c
+++ b/drivers/pci/controller/dwc/pci-keystone.c
@@ -807,8 +807,6 @@ static int __init ks_pcie_host_init(struct pcie_port *pp)
 	if (ret)
 		return ret;
 
-	dw_pcie_setup_rc(pp);
-
 	ks_pcie_stop_link(pci);
 	ks_pcie_setup_rc_app_regs(ks_pcie);
 	writew(PCI_IO_RANGE_TYPE_32 | (PCI_IO_RANGE_TYPE_32 << 8),
diff --git a/drivers/pci/controller/dwc/pci-layerscape.c b/drivers/pci/controller/dwc/pci-layerscape.c
index 0d84986c4c16..400ebbebd00f 100644
--- a/drivers/pci/controller/dwc/pci-layerscape.c
+++ b/drivers/pci/controller/dwc/pci-layerscape.c
@@ -136,8 +136,6 @@ static int ls_pcie_host_init(struct pcie_port *pp)
 
 	ls_pcie_drop_msg_tlp(pcie);
 
-	dw_pcie_setup_rc(pp);
-
 	return 0;
 }
 
diff --git a/drivers/pci/controller/dwc/pci-meson.c b/drivers/pci/controller/dwc/pci-meson.c
index 2df0adcf0bf2..04589f0decb2 100644
--- a/drivers/pci/controller/dwc/pci-meson.c
+++ b/drivers/pci/controller/dwc/pci-meson.c
@@ -380,8 +380,6 @@ static int meson_pcie_host_init(struct pcie_port *pp)
 	meson_set_max_payload(mp, MAX_PAYLOAD_SIZE);
 	meson_set_max_rd_req_size(mp, MAX_READ_REQ_SIZE);
 
-	dw_pcie_setup_rc(pp);
-
 	return 0;
 }
 
diff --git a/drivers/pci/controller/dwc/pcie-armada8k.c b/drivers/pci/controller/dwc/pcie-armada8k.c
index dd2926bbb901..4e2552dcf982 100644
--- a/drivers/pci/controller/dwc/pcie-armada8k.c
+++ b/drivers/pci/controller/dwc/pcie-armada8k.c
@@ -171,8 +171,6 @@ static int armada8k_pcie_host_init(struct pcie_port *pp)
 	u32 reg;
 	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
 
-	dw_pcie_setup_rc(pp);
-
 	if (!dw_pcie_link_up(pci)) {
 		/* Disable LTSSM state machine to enable configuration */
 		reg = dw_pcie_readl_dbi(pci, PCIE_GLOBAL_CONTROL_REG);
diff --git a/drivers/pci/controller/dwc/pcie-artpec6.c b/drivers/pci/controller/dwc/pcie-artpec6.c
index 7ee8f3c83f8f..fcba9915a606 100644
--- a/drivers/pci/controller/dwc/pcie-artpec6.c
+++ b/drivers/pci/controller/dwc/pcie-artpec6.c
@@ -328,7 +328,6 @@ static int artpec6_pcie_host_init(struct pcie_port *pp)
 	artpec6_pcie_init_phy(artpec6_pcie);
 	artpec6_pcie_deassert_core_reset(artpec6_pcie);
 	artpec6_pcie_wait_for_phy(artpec6_pcie);
-	dw_pcie_setup_rc(pp);
 
 	return 0;
 }
diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index ebea2c814448..f2b0a15ad72b 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -422,6 +422,7 @@ int dw_pcie_host_init(struct pcie_port *pp)
 			goto err_free_msi;
 	}
 
+	dw_pcie_setup_rc(pp);
 	dw_pcie_msi_init(pp);
 
 	if (!dw_pcie_link_up(pci) && pci->ops->start_link) {
diff --git a/drivers/pci/controller/dwc/pcie-designware-plat.c b/drivers/pci/controller/dwc/pcie-designware-plat.c
index dec24e595c3e..9b397c807261 100644
--- a/drivers/pci/controller/dwc/pcie-designware-plat.c
+++ b/drivers/pci/controller/dwc/pcie-designware-plat.c
@@ -33,15 +33,7 @@ struct dw_plat_pcie_of_data {
 
 static const struct of_device_id dw_plat_pcie_of_match[];
 
-static int dw_plat_pcie_host_init(struct pcie_port *pp)
-{
-	dw_pcie_setup_rc(pp);
-
-	return 0;
-}
-
 static const struct dw_pcie_host_ops dw_plat_pcie_host_ops = {
-	.host_init = dw_plat_pcie_host_init,
 };
 
 static int dw_plat_pcie_establish_link(struct dw_pcie *pci)
diff --git a/drivers/pci/controller/dwc/pcie-histb.c b/drivers/pci/controller/dwc/pcie-histb.c
index 210777c793ea..86f9d16c50d7 100644
--- a/drivers/pci/controller/dwc/pcie-histb.c
+++ b/drivers/pci/controller/dwc/pcie-histb.c
@@ -196,9 +196,6 @@ static int histb_pcie_host_init(struct pcie_port *pp)
 	regval |= PCIE_WM_RC;
 	histb_pcie_writel(hipcie, PCIE_SYS_CTRL0, regval);
 
-	/* setup root complex */
-	dw_pcie_setup_rc(pp);
-
 	return 0;
 }
 
diff --git a/drivers/pci/controller/dwc/pcie-kirin.c b/drivers/pci/controller/dwc/pcie-kirin.c
index f84ac1b36b2c..ac4bbdaf5324 100644
--- a/drivers/pci/controller/dwc/pcie-kirin.c
+++ b/drivers/pci/controller/dwc/pcie-kirin.c
@@ -405,8 +405,6 @@ static int kirin_pcie_host_init(struct pcie_port *pp)
 {
 	pp->bridge->ops = &kirin_pci_ops;
 
-	dw_pcie_setup_rc(pp);
-
 	return 0;
 }
 
diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index eb107179d544..e49791c4f846 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -1280,7 +1280,6 @@ static int qcom_pcie_host_init(struct pcie_port *pp)
 			goto err_disable_phy;
 	}
 
-	dw_pcie_setup_rc(pp);
 	qcom_ep_reset_deassert(pcie);
 
 	return 0;
diff --git a/drivers/pci/controller/dwc/pcie-spear13xx.c b/drivers/pci/controller/dwc/pcie-spear13xx.c
index 31475e4493a7..1a9e353bef55 100644
--- a/drivers/pci/controller/dwc/pcie-spear13xx.c
+++ b/drivers/pci/controller/dwc/pcie-spear13xx.c
@@ -130,8 +130,6 @@ static int spear13xx_pcie_host_init(struct pcie_port *pp)
 
 	spear13xx_pcie->app_base = pci->dbi_base + 0x2000;
 
-	dw_pcie_setup_rc(pp);
-
 	/*
 	 * this controller support only 128 bytes read size, however its
 	 * default value in capability register is 512 bytes. So force
diff --git a/drivers/pci/controller/dwc/pcie-uniphier.c b/drivers/pci/controller/dwc/pcie-uniphier.c
index e6616408a29c..2457e9dd098d 100644
--- a/drivers/pci/controller/dwc/pcie-uniphier.c
+++ b/drivers/pci/controller/dwc/pcie-uniphier.c
@@ -314,8 +314,6 @@ static int uniphier_pcie_host_init(struct pcie_port *pp)
 
 	uniphier_pcie_irq_enable(priv);
 
-	dw_pcie_setup_rc(pp);
-
 	return 0;
 }
 
-- 
2.25.1

[PATCH v2 13/16] PCI: dwc: Remove unnecessary wrappers around dw_pcie_host_init()

[Rob Herring]

Many calls to dw_pcie_host_init() are in a wrapper function with
nothing else now. Let's remove the pointless extra layer.

Cc: Richard Zhu <hongxing.zhu@nxp.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Pengutronix Kernel Team <kernel@pengutronix.de>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: NXP Linux Team <linux-imx@nxp.com>
Cc: Murali Karicheri <m-karicheri2@ti.com>
Cc: Minghuan Lian <minghuan.Lian@nxp.com>
Cc: Mingkai Hu <mingkai.hu@nxp.com>
Cc: Roy Zang <roy.zang@nxp.com>
Cc: Yue Wang <yue.wang@Amlogic.com>
Cc: Kevin Hilman <khilman@baylibre.com>
Cc: Neil Armstrong <narmstrong@baylibre.com>
Cc: Jerome Brunet <jbrunet@baylibre.com>
Cc: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Cc: Jonathan Chocron <jonnyc@amazon.com>
Cc: Jesper Nilsson <jesper.nilsson@axis.com>
Cc: Xiaowei Song <songxiaowei@hisilicon.com>
Cc: Binghui Wang <wangbinghui@hisilicon.com>
Cc: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-amlogic@lists.infradead.org
Cc: linux-arm-kernel@axis.com
Signed-off-by: Rob Herring <robh@kernel.org>
---
 drivers/pci/controller/dwc/pci-imx6.c       | 22 ++---------------
 drivers/pci/controller/dwc/pci-keystone.c   | 19 +--------------
 drivers/pci/controller/dwc/pci-layerscape.c | 26 ++-------------------
 drivers/pci/controller/dwc/pci-meson.c      | 22 ++---------------
 drivers/pci/controller/dwc/pcie-al.c        | 20 ++--------------
 drivers/pci/controller/dwc/pcie-artpec6.c   | 23 +++---------------
 drivers/pci/controller/dwc/pcie-kirin.c     | 11 ++-------
 drivers/pci/controller/dwc/pcie-uniphier.c  | 23 +++---------------
 8 files changed, 17 insertions(+), 149 deletions(-)

diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
index f9547bb2cf1b..0cf1333c0440 100644
--- a/drivers/pci/controller/dwc/pci-imx6.c
+++ b/drivers/pci/controller/dwc/pci-imx6.c
@@ -842,25 +842,6 @@ static const struct dw_pcie_host_ops imx6_pcie_host_ops = {
 	.host_init = imx6_pcie_host_init,
 };
 
-static int imx6_add_pcie_port(struct imx6_pcie *imx6_pcie,
-			      struct platform_device *pdev)
-{
-	struct dw_pcie *pci = imx6_pcie->pci;
-	struct pcie_port *pp = &pci->pp;
-	struct device *dev = &pdev->dev;
-	int ret;
-
-	pp->ops = &imx6_pcie_host_ops;
-
-	ret = dw_pcie_host_init(pp);
-	if (ret) {
-		dev_err(dev, "failed to initialize host\n");
-		return ret;
-	}
-
-	return 0;
-}
-
 static const struct dw_pcie_ops dw_pcie_ops = {
 	.start_link = imx6_pcie_start_link,
 };
@@ -1005,6 +986,7 @@ static int imx6_pcie_probe(struct platform_device *pdev)
 
 	pci->dev = dev;
 	pci->ops = &dw_pcie_ops;
+	pci->pp.ops = &imx6_pcie_host_ops;
 
 	imx6_pcie->pci = pci;
 	imx6_pcie->drvdata = of_device_get_match_data(dev);
@@ -1154,7 +1136,7 @@ static int imx6_pcie_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
-	ret = imx6_add_pcie_port(imx6_pcie, pdev);
+	ret = dw_pcie_host_init(&pci->pp);
 	if (ret < 0)
 		return ret;
 
diff --git a/drivers/pci/controller/dwc/pci-keystone.c b/drivers/pci/controller/dwc/pci-keystone.c
index 5a4bcc2b1ddb..719756160821 100644
--- a/drivers/pci/controller/dwc/pci-keystone.c
+++ b/drivers/pci/controller/dwc/pci-keystone.c
@@ -844,23 +844,6 @@ static irqreturn_t ks_pcie_err_irq_handler(int irq, void *priv)
 	return ks_pcie_handle_error_irq(ks_pcie);
 }
 
-static int __init ks_pcie_add_pcie_port(struct keystone_pcie *ks_pcie,
-					struct platform_device *pdev)
-{
-	struct dw_pcie *pci = ks_pcie->pci;
-	struct pcie_port *pp = &pci->pp;
-	struct device *dev = &pdev->dev;
-	int ret;
-
-	ret = dw_pcie_host_init(pp);
-	if (ret) {
-		dev_err(dev, "failed to initialize host\n");
-		return ret;
-	}
-
-	return 0;
-}
-
 static void ks_pcie_am654_write_dbi2(struct dw_pcie *pci, void __iomem *base,
 				     u32 reg, size_t size, u32 val)
 {
@@ -1255,7 +1238,7 @@ static int __init ks_pcie_probe(struct platform_device *pdev)
 		}
 
 		pci->pp.ops = host_ops;
-		ret = ks_pcie_add_pcie_port(ks_pcie, pdev);
+		ret = dw_pcie_host_init(&pci->pp);
 		if (ret < 0)
 			goto err_get_sync;
 		break;
diff --git a/drivers/pci/controller/dwc/pci-layerscape.c b/drivers/pci/controller/dwc/pci-layerscape.c
index 400ebbebd00f..44ad34cdc3bc 100644
--- a/drivers/pci/controller/dwc/pci-layerscape.c
+++ b/drivers/pci/controller/dwc/pci-layerscape.c
@@ -232,31 +232,12 @@ static const struct of_device_id ls_pcie_of_match[] = {
 	{ },
 };
 
-static int __init ls_add_pcie_port(struct ls_pcie *pcie)
-{
-	struct dw_pcie *pci = pcie->pci;
-	struct pcie_port *pp = &pci->pp;
-	struct device *dev = pci->dev;
-	int ret;
-
-	pp->ops = pcie->drvdata->ops;
-
-	ret = dw_pcie_host_init(pp);
-	if (ret) {
-		dev_err(dev, "failed to initialize host\n");
-		return ret;
-	}
-
-	return 0;
-}
-
 static int __init ls_pcie_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct dw_pcie *pci;
 	struct ls_pcie *pcie;
 	struct resource *dbi_base;
-	int ret;
 
 	pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
 	if (!pcie)
@@ -270,6 +251,7 @@ static int __init ls_pcie_probe(struct platform_device *pdev)
 
 	pci->dev = dev;
 	pci->ops = pcie->drvdata->dw_pcie_ops;
+	pci->pp.ops = pcie->drvdata->ops;
 
 	pcie->pci = pci;
 
@@ -285,11 +267,7 @@ static int __init ls_pcie_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, pcie);
 
-	ret = ls_add_pcie_port(pcie);
-	if (ret < 0)
-		return ret;
-
-	return 0;
+	return dw_pcie_host_init(&pci->pp);
 }
 
 static struct platform_driver ls_pcie_driver = {
diff --git a/drivers/pci/controller/dwc/pci-meson.c b/drivers/pci/controller/dwc/pci-meson.c
index 04589f0decb2..686ded034f22 100644
--- a/drivers/pci/controller/dwc/pci-meson.c
+++ b/drivers/pci/controller/dwc/pci-meson.c
@@ -387,25 +387,6 @@ static const struct dw_pcie_host_ops meson_pcie_host_ops = {
 	.host_init = meson_pcie_host_init,
 };
 
-static int meson_add_pcie_port(struct meson_pcie *mp,
-			       struct platform_device *pdev)
-{
-	struct dw_pcie *pci = &mp->pci;
-	struct pcie_port *pp = &pci->pp;
-	struct device *dev = &pdev->dev;
-	int ret;
-
-	pp->ops = &meson_pcie_host_ops;
-
-	ret = dw_pcie_host_init(pp);
-	if (ret) {
-		dev_err(dev, "failed to initialize host\n");
-		return ret;
-	}
-
-	return 0;
-}
-
 static const struct dw_pcie_ops dw_pcie_ops = {
 	.link_up = meson_pcie_link_up,
 	.start_link = meson_pcie_start_link,
@@ -425,6 +406,7 @@ static int meson_pcie_probe(struct platform_device *pdev)
 	pci = &mp->pci;
 	pci->dev = dev;
 	pci->ops = &dw_pcie_ops;
+	pci->pp.ops = &meson_pcie_host_ops;
 	pci->num_lanes = 1;
 
 	mp->phy = devm_phy_get(dev, "pcie");
@@ -471,7 +453,7 @@ static int meson_pcie_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, mp);
 
-	ret = meson_add_pcie_port(mp, pdev);
+	ret = dw_pcie_host_init(&pci->pp);
 	if (ret < 0) {
 		dev_err(dev, "Add PCIe port failed, %d\n", ret);
 		goto err_phy;
diff --git a/drivers/pci/controller/dwc/pcie-al.c b/drivers/pci/controller/dwc/pcie-al.c
index d06866921187..7ac8a37d9ce0 100644
--- a/drivers/pci/controller/dwc/pcie-al.c
+++ b/drivers/pci/controller/dwc/pcie-al.c
@@ -322,23 +322,6 @@ static const struct dw_pcie_host_ops al_pcie_host_ops = {
 	.host_init = al_pcie_host_init,
 };
 
-static int al_add_pcie_port(struct pcie_port *pp,
-			    struct platform_device *pdev)
-{
-	struct device *dev = &pdev->dev;
-	int ret;
-
-	pp->ops = &al_pcie_host_ops;
-
-	ret = dw_pcie_host_init(pp);
-	if (ret) {
-		dev_err(dev, "failed to initialize host\n");
-		return ret;
-	}
-
-	return 0;
-}
-
 static const struct dw_pcie_ops dw_pcie_ops = {
 };
 
@@ -360,6 +343,7 @@ static int al_pcie_probe(struct platform_device *pdev)
 
 	pci->dev = dev;
 	pci->ops = &dw_pcie_ops;
+	pci->pp.ops = &al_pcie_host_ops;
 
 	al_pcie->pci = pci;
 	al_pcie->dev = dev;
@@ -384,7 +368,7 @@ static int al_pcie_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, al_pcie);
 
-	return al_add_pcie_port(&pci->pp, pdev);
+	return dw_pcie_host_init(&pci->pp);
 }
 
 static const struct of_device_id al_pcie_of_match[] = {
diff --git a/drivers/pci/controller/dwc/pcie-artpec6.c b/drivers/pci/controller/dwc/pcie-artpec6.c
index fcba9915a606..597c282f586c 100644
--- a/drivers/pci/controller/dwc/pcie-artpec6.c
+++ b/drivers/pci/controller/dwc/pcie-artpec6.c
@@ -336,25 +336,6 @@ static const struct dw_pcie_host_ops artpec6_pcie_host_ops = {
 	.host_init = artpec6_pcie_host_init,
 };
 
-static int artpec6_add_pcie_port(struct artpec6_pcie *artpec6_pcie,
-				 struct platform_device *pdev)
-{
-	struct dw_pcie *pci = artpec6_pcie->pci;
-	struct pcie_port *pp = &pci->pp;
-	struct device *dev = pci->dev;
-	int ret;
-
-	pp->ops = &artpec6_pcie_host_ops;
-
-	ret = dw_pcie_host_init(pp);
-	if (ret) {
-		dev_err(dev, "failed to initialize host\n");
-		return ret;
-	}
-
-	return 0;
-}
-
 static void artpec6_pcie_ep_init(struct dw_pcie_ep *ep)
 {
 	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
@@ -445,7 +426,9 @@ static int artpec6_pcie_probe(struct platform_device *pdev)
 		if (!IS_ENABLED(CONFIG_PCIE_ARTPEC6_HOST))
 			return -ENODEV;
 
-		ret = artpec6_add_pcie_port(artpec6_pcie, pdev);
+		pci->pp.ops = &artpec6_pcie_host_ops;
+
+		ret = dw_pcie_host_init(&pci->pp);
 		if (ret < 0)
 			return ret;
 		break;
diff --git a/drivers/pci/controller/dwc/pcie-kirin.c b/drivers/pci/controller/dwc/pcie-kirin.c
index ac4bbdaf5324..026fd1e42a55 100644
--- a/drivers/pci/controller/dwc/pcie-kirin.c
+++ b/drivers/pci/controller/dwc/pcie-kirin.c
@@ -419,14 +419,6 @@ static const struct dw_pcie_host_ops kirin_pcie_host_ops = {
 	.host_init = kirin_pcie_host_init,
 };
 
-static int kirin_add_pcie_port(struct dw_pcie *pci,
-			       struct platform_device *pdev)
-{
-	pci->pp.ops = &kirin_pcie_host_ops;
-
-	return dw_pcie_host_init(&pci->pp);
-}
-
 static int kirin_pcie_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -449,6 +441,7 @@ static int kirin_pcie_probe(struct platform_device *pdev)
 
 	pci->dev = dev;
 	pci->ops = &kirin_dw_pcie_ops;
+	pci->pp.ops = &kirin_pcie_host_ops;
 	kirin_pcie->pci = pci;
 
 	ret = kirin_pcie_get_clk(kirin_pcie, pdev);
@@ -474,7 +467,7 @@ static int kirin_pcie_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, kirin_pcie);
 
-	return kirin_add_pcie_port(pci, pdev);
+	return dw_pcie_host_init(&pci->pp);
 }
 
 static const struct of_device_id kirin_pcie_match[] = {
diff --git a/drivers/pci/controller/dwc/pcie-uniphier.c b/drivers/pci/controller/dwc/pcie-uniphier.c
index 2457e9dd098d..7e8bad326770 100644
--- a/drivers/pci/controller/dwc/pcie-uniphier.c
+++ b/drivers/pci/controller/dwc/pcie-uniphier.c
@@ -321,25 +321,6 @@ static const struct dw_pcie_host_ops uniphier_pcie_host_ops = {
 	.host_init = uniphier_pcie_host_init,
 };
 
-static int uniphier_add_pcie_port(struct uniphier_pcie_priv *priv,
-				  struct platform_device *pdev)
-{
-	struct dw_pcie *pci = &priv->pci;
-	struct pcie_port *pp = &pci->pp;
-	struct device *dev = &pdev->dev;
-	int ret;
-
-	pp->ops = &uniphier_pcie_host_ops;
-
-	ret = dw_pcie_host_init(pp);
-	if (ret) {
-		dev_err(dev, "Failed to initialize host (%d)\n", ret);
-		return ret;
-	}
-
-	return 0;
-}
-
 static int uniphier_pcie_host_enable(struct uniphier_pcie_priv *priv)
 {
 	int ret;
@@ -415,7 +396,9 @@ static int uniphier_pcie_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
-	return uniphier_add_pcie_port(priv, pdev);
+	priv->pci.pp.ops = &uniphier_pcie_host_ops;
+
+	return dw_pcie_host_init(&priv->pci.pp);
 }
 
 static const struct of_device_id uniphier_pcie_match[] = {
-- 
2.25.1

[PATCH v2 14/16] Revert "PCI: dwc/keystone: Drop duplicated 'num-viewport'"

[Rob Herring]

This reverts commit 421063efaf1e8f2ac6248cca0064e5877e375f87.

In preparation to detect the number of iATU regions instead of using DT
properties, we need to keep reading 'num-viewport' for the Keystone
driver which doesn't use the iATU in older versions of the IP.

However, note that Keystone has been broken for some time with upstream
dts files which don't set 'num-viewports'. The reverted commit did
make the property optional, but now it's mandatory again.

Cc: Murali Karicheri <m-karicheri2@ti.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Rob Herring <robh@kernel.org>
---
v2:
 - new patch

 drivers/pci/controller/dwc/pci-keystone.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/controller/dwc/pci-keystone.c b/drivers/pci/controller/dwc/pci-keystone.c
index 719756160821..53aa35cb3a49 100644
--- a/drivers/pci/controller/dwc/pci-keystone.c
+++ b/drivers/pci/controller/dwc/pci-keystone.c
@@ -121,6 +121,7 @@ struct keystone_pcie {

 	int			msi_host_irq;
 	int			num_lanes;
+	u32			num_viewport;
 	struct phy		**phy;
 	struct device_link	**link;
 	struct			device_node *msi_intc_np;
@@ -386,9 +387,9 @@ static void ks_pcie_clear_dbi_mode(struct keystone_pcie *ks_pcie)
 static void ks_pcie_setup_rc_app_regs(struct keystone_pcie *ks_pcie)
 {
 	u32 val;
+	u32 num_viewport = ks_pcie->num_viewport;
 	struct dw_pcie *pci = ks_pcie->pci;
 	struct pcie_port *pp = &pci->pp;
-	u32 num_viewport = pci->num_viewport;
 	u64 start, end;
 	struct resource *mem;
 	int i;
@@ -1093,6 +1094,7 @@ static int __init ks_pcie_probe(struct platform_device *pdev)
 	struct resource *res;
 	unsigned int version;
 	void __iomem *base;
+	u32 num_viewport;
 	struct phy **phy;
 	u32 num_lanes;
 	char name[10];
@@ -1224,6 +1226,12 @@ static int __init ks_pcie_probe(struct platform_device *pdev)
 			goto err_get_sync;
 		}

+		ret = of_property_read_u32(np, "num-viewport", &num_viewport);
+		if (ret < 0) {
+			dev_err(dev, "unable to read *num-viewport* property\n");
+			goto err_get_sync;
+		}
+
 		/*
 		 * "Power Sequencing and Reset Signal Timings" table in
 		 * PCI EXPRESS CARD ELECTROMECHANICAL SPECIFICATION, REV. 2.0
@@ -1237,6 +1245,7 @@ static int __init ks_pcie_probe(struct platform_device *pdev)
 			gpiod_set_value_cansleep(gpiod, 1);
 		}

+		ks_pcie->num_viewport = num_viewport;
 		pci->pp.ops = host_ops;
 		ret = dw_pcie_host_init(&pci->pp);
 		if (ret < 0)
--
2.25.1

[PATCH v2 15/16] PCI: dwc: Move inbound and outbound windows to common struct

[Rob Herring]

The number of inbound and outbound windows are defined by the h/w and
apply to both RC and EP modes, so move them to the appropriate struct.

Cc: Jingoo Han <jingoohan1@gmail.com>
Cc: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Rob Herring <robh@kernel.org>
---
v2:
 - new patch

 .../pci/controller/dwc/pcie-designware-ep.c   | 25 ++++++++++---------
 drivers/pci/controller/dwc/pcie-designware.h  |  4 +--
 2 files changed, 15 insertions(+), 14 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
index 6fe176e1bdd2..79b998982e41 100644
--- a/drivers/pci/controller/dwc/pcie-designware-ep.c
+++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
@@ -161,8 +161,8 @@ static int dw_pcie_ep_inbound_atu(struct dw_pcie_ep *ep, u8 func_no,
 	u32 free_win;
 	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);

-	free_win = find_first_zero_bit(ep->ib_window_map, ep->num_ib_windows);
-	if (free_win >= ep->num_ib_windows) {
+	free_win = find_first_zero_bit(ep->ib_window_map, pci->num_ib_windows);
+	if (free_win >= pci->num_ib_windows) {
 		dev_err(pci->dev, "No free inbound window\n");
 		return -EINVAL;
 	}
@@ -187,8 +187,8 @@ static int dw_pcie_ep_outbound_atu(struct dw_pcie_ep *ep, u8 func_no,
 	u32 free_win;
 	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);

-	free_win = find_first_zero_bit(ep->ob_window_map, ep->num_ob_windows);
-	if (free_win >= ep->num_ob_windows) {
+	free_win = find_first_zero_bit(ep->ob_window_map, pci->num_ob_windows);
+	if (free_win >= pci->num_ob_windows) {
 		dev_err(pci->dev, "No free outbound window\n");
 		return -EINVAL;
 	}
@@ -264,8 +264,9 @@ static int dw_pcie_find_index(struct dw_pcie_ep *ep, phys_addr_t addr,
 			      u32 *atu_index)
 {
 	u32 index;
+	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);

-	for (index = 0; index < ep->num_ob_windows; index++) {
+	for (index = 0; index < pci->num_ob_windows; index++) {
 		if (ep->outbound_addr[index] != addr)
 			continue;
 		*atu_index = index;
@@ -713,41 +714,41 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep)
 	ep->phys_base = res->start;
 	ep->addr_size = resource_size(res);

-	ret = of_property_read_u32(np, "num-ib-windows", &ep->num_ib_windows);
+	ret = of_property_read_u32(np, "num-ib-windows", &pci->num_ib_windows);
 	if (ret < 0) {
 		dev_err(dev, "Unable to read *num-ib-windows* property\n");
 		return ret;
 	}
-	if (ep->num_ib_windows > MAX_IATU_IN) {
+	if (pci->num_ib_windows > MAX_IATU_IN) {
 		dev_err(dev, "Invalid *num-ib-windows*\n");
 		return -EINVAL;
 	}

-	ret = of_property_read_u32(np, "num-ob-windows", &ep->num_ob_windows);
+	ret = of_property_read_u32(np, "num-ob-windows", &pci->num_ob_windows);
 	if (ret < 0) {
 		dev_err(dev, "Unable to read *num-ob-windows* property\n");
 		return ret;
 	}
-	if (ep->num_ob_windows > MAX_IATU_OUT) {
+	if (pci->num_ob_windows > MAX_IATU_OUT) {
 		dev_err(dev, "Invalid *num-ob-windows*\n");
 		return -EINVAL;
 	}

 	ep->ib_window_map = devm_kcalloc(dev,
-					 BITS_TO_LONGS(ep->num_ib_windows),
+					 BITS_TO_LONGS(pci->num_ib_windows),
 					 sizeof(long),
 					 GFP_KERNEL);
 	if (!ep->ib_window_map)
 		return -ENOMEM;

 	ep->ob_window_map = devm_kcalloc(dev,
-					 BITS_TO_LONGS(ep->num_ob_windows),
+					 BITS_TO_LONGS(pci->num_ob_windows),
 					 sizeof(long),
 					 GFP_KERNEL);
 	if (!ep->ob_window_map)
 		return -ENOMEM;

-	addr = devm_kcalloc(dev, ep->num_ob_windows, sizeof(phys_addr_t),
+	addr = devm_kcalloc(dev, pci->num_ob_windows, sizeof(phys_addr_t),
 			    GFP_KERNEL);
 	if (!addr)
 		return -ENOMEM;
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index 57326aebc6e1..e4f964e6cabe 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -236,8 +236,6 @@ struct dw_pcie_ep {
 	phys_addr_t		*outbound_addr;
 	unsigned long		*ib_window_map;
 	unsigned long		*ob_window_map;
-	u32			num_ib_windows;
-	u32			num_ob_windows;
 	void __iomem		*msi_mem;
 	phys_addr_t		msi_mem_phys;
 	struct pci_epf_bar	*epf_bar[PCI_STD_NUM_BARS];
@@ -263,6 +261,8 @@ struct dw_pcie {
 	/* Used when iatu_unroll_enabled is true */
 	void __iomem		*atu_base;
 	u32			num_viewport;
+	u32			num_ib_windows;
+	u32			num_ob_windows;
 	struct pcie_port	pp;
 	struct dw_pcie_ep	ep;
 	const struct dw_pcie_ops *ops;
--
2.25.1

[PATCH v2 16/16] PCI: dwc: Detect number of iATU windows

[Rob Herring]

Currently the number of inbound and outbound iATU windows are determined
from DT properties. Unfortunately, there's 'num-viewport' for RC mode
and 'num-ib-windows' and 'num-ob-windows' for EP mode, yet the number of
windows is not mode dependent. Also, 'num-viewport' is not clear whether
that's inbound, outbound or both. We can probably assume it's outbound
windows as that's all RC mode uses.

However, using DT properties isn't really needed as the number of
regions can be detected at runtime by poking the iATU registers. The
basic algorithm is just writing a target address and reading back what
we wrote. In the unrolled ATU case, we have to take care not to go
past the mapped region.

With this, we can drop num_viewport in favor of num_ob_windows instead.

Cc: Jingoo Han <jingoohan1@gmail.com>
Cc: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Jonathan Hunter <jonathanh@nvidia.com>
Cc: linux-tegra@vger.kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>
---
v2:
 - new patch

 .../pci/controller/dwc/pcie-designware-ep.c   | 20 ----
 .../pci/controller/dwc/pcie-designware-host.c | 14 +--
 drivers/pci/controller/dwc/pcie-designware.c  | 93 +++++++++++++++++--
 drivers/pci/controller/dwc/pcie-designware.h  |  2 +-
 drivers/pci/controller/dwc/pcie-intel-gw.c    |  8 --
 drivers/pci/controller/dwc/pcie-tegra194.c    |  1 +
 6 files changed, 93 insertions(+), 45 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
index 79b998982e41..bcd1cd9ba8c8 100644
--- a/drivers/pci/controller/dwc/pcie-designware-ep.c
+++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
@@ -714,26 +714,6 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep)
 	ep->phys_base = res->start;
 	ep->addr_size = resource_size(res);

-	ret = of_property_read_u32(np, "num-ib-windows", &pci->num_ib_windows);
-	if (ret < 0) {
-		dev_err(dev, "Unable to read *num-ib-windows* property\n");
-		return ret;
-	}
-	if (pci->num_ib_windows > MAX_IATU_IN) {
-		dev_err(dev, "Invalid *num-ib-windows*\n");
-		return -EINVAL;
-	}
-
-	ret = of_property_read_u32(np, "num-ob-windows", &pci->num_ob_windows);
-	if (ret < 0) {
-		dev_err(dev, "Unable to read *num-ob-windows* property\n");
-		return ret;
-	}
-	if (pci->num_ob_windows > MAX_IATU_OUT) {
-		dev_err(dev, "Invalid *num-ob-windows*\n");
-		return -EINVAL;
-	}
-
 	ep->ib_window_map = devm_kcalloc(dev,
 					 BITS_TO_LONGS(pci->num_ib_windows),
 					 sizeof(long),
diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index f2b0a15ad72b..99ef808a40a9 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -356,10 +356,6 @@ int dw_pcie_host_init(struct pcie_port *pp)
 		}
 	}

-	ret = of_property_read_u32(np, "num-viewport", &pci->num_viewport);
-	if (ret)
-		pci->num_viewport = 2;
-
 	if (pci->link_gen < 1)
 		pci->link_gen = of_pci_get_max_link_speed(np);

@@ -598,7 +594,7 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
 	dw_pcie_writel_dbi(pci, PCI_COMMAND, val);

 	/* Ensure all outbound windows are disabled so there are multiple matches */
-	for (i = 0; i < pci->num_viewport; i++)
+	for (i = 0; i < pci->num_ob_windows; i++)
 		dw_pcie_disable_atu(pci, i, DW_PCIE_REGION_OUTBOUND);

 	/*
@@ -615,7 +611,7 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
 			if (resource_type(entry->res) != IORESOURCE_MEM)
 				continue;

-			if (pci->num_viewport <= ++atu_idx)
+			if (pci->num_ob_windows <= ++atu_idx)
 				break;

 			dw_pcie_prog_outbound_atu(pci, atu_idx,
@@ -625,7 +621,7 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
 		}

 		if (pp->io_size) {
-			if (pci->num_viewport > ++atu_idx)
+			if (pci->num_ob_windows > ++atu_idx)
 				dw_pcie_prog_outbound_atu(pci, atu_idx,
 							  PCIE_ATU_TYPE_IO, pp->io_base,
 							  pp->io_bus_addr, pp->io_size);
@@ -633,9 +629,9 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
 				pci->io_cfg_atu_shared = true;
 		}

-		if (pci->num_viewport <= atu_idx)
+		if (pci->num_ob_windows <= atu_idx)
 			dev_warn(pci->dev, "Resources exceed number of ATU entries (%d)",
-				 pci->num_viewport);
+				 pci->num_ob_windows);
 	}

 	dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, 0);
diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
index c2dea8fc97c8..f4242ec13320 100644
--- a/drivers/pci/controller/dwc/pcie-designware.c
+++ b/drivers/pci/controller/dwc/pcie-designware.c
@@ -544,6 +544,70 @@ static u8 dw_pcie_iatu_unroll_enabled(struct dw_pcie *pci)
 	return 0;
 }

+static void dw_pcie_iatu_detect_regions_unroll(struct dw_pcie *pci)
+{
+	int max_region, i, ob = 0, ib = 0;
+	u32 val;
+
+	max_region = min((int)pci->atu_size / 512, 256);
+
+	for (i = 0; i < max_region; i++) {
+		dw_pcie_writel_ob_unroll(pci, i, PCIE_ATU_UNR_LOWER_TARGET,
+					0x11110000);
+
+		val = dw_pcie_readl_ob_unroll(pci, i, PCIE_ATU_UNR_LOWER_TARGET);
+		if (val == 0x11110000)
+			ob++;
+		else
+			break;
+	}
+
+	for (i = 0; i < max_region; i++) {
+		dw_pcie_writel_ib_unroll(pci, i, PCIE_ATU_UNR_LOWER_TARGET,
+					0x11110000);
+
+		val = dw_pcie_readl_ib_unroll(pci, i, PCIE_ATU_UNR_LOWER_TARGET);
+		if (val == 0x11110000)
+			ib++;
+		else
+			break;
+	}
+	pci->num_ib_windows = ib;
+	pci->num_ob_windows = ob;
+}
+
+static void dw_pcie_iatu_detect_regions(struct dw_pcie *pci)
+{
+	int max_region, i, ob = 0, ib = 0;
+	u32 val;
+
+	dw_pcie_writel_dbi(pci, PCIE_ATU_VIEWPORT, 0xFF);
+	max_region = dw_pcie_readl_dbi(pci, PCIE_ATU_VIEWPORT) + 1;
+
+	for (i = 0; i < max_region; i++) {
+		dw_pcie_writel_dbi(pci, PCIE_ATU_VIEWPORT, PCIE_ATU_REGION_OUTBOUND | i);
+		dw_pcie_writel_dbi(pci, PCIE_ATU_LOWER_TARGET, 0x11110000);
+		val = dw_pcie_readl_dbi(pci, PCIE_ATU_LOWER_TARGET);
+		if (val == 0x11110000)
+			ob++;
+		else
+			break;
+	}
+
+	for (i = 0; i < max_region; i++) {
+		dw_pcie_writel_dbi(pci, PCIE_ATU_VIEWPORT, PCIE_ATU_REGION_INBOUND | i);
+		dw_pcie_writel_dbi(pci, PCIE_ATU_LOWER_TARGET, 0x11110000);
+		val = dw_pcie_readl_dbi(pci, PCIE_ATU_LOWER_TARGET);
+		if (val == 0x11110000)
+			ib++;
+		else
+			break;
+	}
+
+	pci->num_ib_windows = ib;
+	pci->num_ob_windows = ob;
+}
+
 void dw_pcie_setup(struct dw_pcie *pci)
 {
 	u32 val;
@@ -554,15 +618,30 @@ void dw_pcie_setup(struct dw_pcie *pci)
 	if (pci->version >= 0x480A || (!pci->version &&
 				       dw_pcie_iatu_unroll_enabled(pci))) {
 		pci->iatu_unroll_enabled = true;
-		if (!pci->atu_base)
-			pci->atu_base =
-			    devm_platform_ioremap_resource_byname(pdev, "atu");
-		if (IS_ERR(pci->atu_base))
-			pci->atu_base = pci->dbi_base + DEFAULT_DBI_ATU_OFFSET;
-	}
-	dev_dbg(pci->dev, "iATU unroll: %s\n", pci->iatu_unroll_enabled ?
+		if (!pci->atu_base) {
+			struct resource *res =
+				platform_get_resource_byname(pdev, IORESOURCE_MEM, "atu");
+			if (res)
+				pci->atu_size = resource_size(res);
+			pci->atu_base = devm_ioremap_resource(dev, res);
+			if (IS_ERR(pci->atu_base))
+				pci->atu_base = pci->dbi_base + DEFAULT_DBI_ATU_OFFSET;
+		}
+
+		if (!pci->atu_size)
+			/* Pick a minimal default, enough for 8 in and 8 out windows */
+			pci->atu_size = SZ_4K;
+
+		dw_pcie_iatu_detect_regions_unroll(pci);
+	} else
+		dw_pcie_iatu_detect_regions(pci);
+
+	dev_info(pci->dev, "iATU unroll: %s\n", pci->iatu_unroll_enabled ?
 		"enabled" : "disabled");

+	dev_info(pci->dev, "Detected iATU regions: %u outbound, %u inbound",
+		 pci->num_ob_windows, pci->num_ib_windows);
+
 	if (pci->link_gen > 0)
 		dw_pcie_link_set_max_speed(pci, pci->link_gen);

diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index e4f964e6cabe..ddf1bc733c08 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -260,7 +260,7 @@ struct dw_pcie {
 	void __iomem		*dbi_base2;
 	/* Used when iatu_unroll_enabled is true */
 	void __iomem		*atu_base;
-	u32			num_viewport;
+	size_t			atu_size;
 	u32			num_ib_windows;
 	u32			num_ob_windows;
 	struct pcie_port	pp;
diff --git a/drivers/pci/controller/dwc/pcie-intel-gw.c b/drivers/pci/controller/dwc/pcie-intel-gw.c
index 292b9de86532..0cedd1f95f37 100644
--- a/drivers/pci/controller/dwc/pcie-intel-gw.c
+++ b/drivers/pci/controller/dwc/pcie-intel-gw.c
@@ -58,7 +58,6 @@

 struct intel_pcie_soc {
 	unsigned int	pcie_ver;
-	u32		num_viewport;
 };

 struct intel_pcie_port {
@@ -400,7 +399,6 @@ static const struct dw_pcie_host_ops intel_pcie_dw_ops = {

 static const struct intel_pcie_soc pcie_data = {
 	.pcie_ver =		0x520A,
-	.num_viewport =		3,
 };

 static int intel_pcie_probe(struct platform_device *pdev)
@@ -443,12 +441,6 @@ static int intel_pcie_probe(struct platform_device *pdev)
 		return ret;
 	}

-	/*
-	 * Intel PCIe doesn't configure IO region, so set viewport
-	 * to not perform IO region access.
-	 */
-	pci->num_viewport = data->num_viewport;
-
 	return 0;
 }

diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c
index 84f3e0bb4c7a..fa54d9aaa430 100644
--- a/drivers/pci/controller/dwc/pcie-tegra194.c
+++ b/drivers/pci/controller/dwc/pcie-tegra194.c
@@ -2075,6 +2075,7 @@ static int tegra_pcie_dw_probe(struct platform_device *pdev)
 	}
 	pcie->atu_dma_res = atu_dma_res;

+	pci->atu_size = resource_size(atu_dma_res);
 	pci->atu_base = devm_ioremap_resource(dev, atu_dma_res);
 	if (IS_ERR(pci->atu_base))
 		return PTR_ERR(pci->atu_base);
--
2.25.1

Re: [PATCH v2 00/16] PCI: dwc: Another round of clean-ups

[Marek Szyprowski]

Hi Rob,

On 05.11.2020 22:11, Rob Herring wrote:
> Here's another batch of DWC PCI host refactoring. This series primarily
> moves more of the MSI, link up, and resource handling to the core
> code. Beyond a couple of minor fixes, new in this version is runtime
> detection of iATU regions instead of using DT properties.

iATU detection seems to work fine with 
https://lore.kernel.org/linux-samsung-soc/20201029134017.27400-1-m.szyprowski@samsung.com/ 
on top of your patchset on Samsung Exynos5433 SoC:

exynos-pcie 15700000.pcie: host bridge /soc@0/pcie@15700000 ranges:
exynos-pcie 15700000.pcie:       IO 0x000c001000..0x000c010fff -> 
0x0000000000
exynos-pcie 15700000.pcie:      MEM 0x000c011000..0x000ffffffe -> 
0x000c011000
exynos-pcie 15700000.pcie: iATU unroll: disabled
exynos-pcie 15700000.pcie: Detected iATU regions: 3 outbound, 5 inbound
exynos-pcie 15700000.pcie: Link up
exynos-pcie 15700000.pcie: PCI host bridge to bus 0000:00

Fell free to add my:

Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>

> No doubt I've probably broken something. Please test. I've run this thru
> kernelci and checked boards with DWC PCI which currently is just
> Layerscape boards (hint: add boards and/or enable PCI). A git branch is
> here[1].
>
> This is dependent on "PCI: dwc: Restore ATU memory resource setup to use
> last entry" which will be in v5.10-rc3.
>
> Rob
>
> [1] git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git pci-more-dwc-cleanup
>
> Rob Herring (16):
>    PCI: dwc: Support multiple ATU memory regions
>    PCI: dwc/intel-gw: Move ATU offset out of driver match data
>    PCI: dwc: Move "dbi", "dbi2", and "addr_space" resource setup into
>      common code
>    PCI: dwc/intel-gw: Remove some unneeded function wrappers
>    PCI: dwc: Ensure all outbound ATU windows are reset
>    PCI: dwc/dra7xx: Use the common MSI irq_chip
>    PCI: dwc: Drop the .set_num_vectors() host op
>    PCI: dwc: Move MSI interrupt setup into DWC common code
>    PCI: dwc: Rework MSI initialization
>    PCI: dwc: Move link handling into common code
>    PCI: dwc: Move dw_pcie_msi_init() into core
>    PCI: dwc: Move dw_pcie_setup_rc() to DWC common code
>    PCI: dwc: Remove unnecessary wrappers around dw_pcie_host_init()
>    Revert "PCI: dwc/keystone: Drop duplicated 'num-viewport'"
>    PCI: dwc: Move inbound and outbound windows to common struct
>    PCI: dwc: Detect number of iATU windows
>
>   drivers/pci/controller/dwc/pci-dra7xx.c       | 141 +-----------------
>   drivers/pci/controller/dwc/pci-exynos.c       |  50 ++-----
>   drivers/pci/controller/dwc/pci-imx6.c         |  39 +----
>   drivers/pci/controller/dwc/pci-keystone.c     |  79 ++--------
>   .../pci/controller/dwc/pci-layerscape-ep.c    |  37 +----
>   drivers/pci/controller/dwc/pci-layerscape.c   |  67 +--------
>   drivers/pci/controller/dwc/pci-meson.c        |  53 ++-----
>   drivers/pci/controller/dwc/pcie-al.c          |  29 +---
>   drivers/pci/controller/dwc/pcie-armada8k.c    |  37 ++---
>   drivers/pci/controller/dwc/pcie-artpec6.c     |  76 +---------
>   .../pci/controller/dwc/pcie-designware-ep.c   |  58 +++----
>   .../pci/controller/dwc/pcie-designware-host.c | 139 ++++++++++-------
>   .../pci/controller/dwc/pcie-designware-plat.c |  70 +--------
>   drivers/pci/controller/dwc/pcie-designware.c  |  93 +++++++++++-
>   drivers/pci/controller/dwc/pcie-designware.h  |  24 +--
>   drivers/pci/controller/dwc/pcie-histb.c       |  37 ++---
>   drivers/pci/controller/dwc/pcie-intel-gw.c    |  67 ++-------
>   drivers/pci/controller/dwc/pcie-kirin.c       |  62 +-------
>   drivers/pci/controller/dwc/pcie-qcom.c        |  38 +----
>   drivers/pci/controller/dwc/pcie-spear13xx.c   |  62 +++-----
>   drivers/pci/controller/dwc/pcie-tegra194.c    |  41 +----
>   drivers/pci/controller/dwc/pcie-uniphier-ep.c |  38 +----
>   drivers/pci/controller/dwc/pcie-uniphier.c    |  51 +------
>   23 files changed, 356 insertions(+), 1032 deletions(-)
>
> --
> 2.25.1
>
Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland

Re: [PATCH v2 09/16] PCI: dwc: Rework MSI initialization

[Jisheng Zhang]

On Thu,  5 Nov 2020 15:11:52 -0600
Rob Herring <robh@kernel.org> wrote:

> CAUTION: Email originated externally, do not click links or open attachments unless you recognize the sender and know the content is safe.
> 
> 
> There are 3 possible MSI implementations for the DWC host. The first is
> using the built-in DWC MSI controller. The 2nd is a custom MSI
> controller as part of the PCI host (keystone only). The 3rd is an
> external MSI controller (typically GICv3 ITS). Currently, the last 2
> are distinguished with a .msi_host_init() hook with the 3rd option using
> an empty function. However we can detect the 3rd case with the presence
> of 'msi-parent' or 'msi-map' properties, so let's do that instead and
> remove the empty functions.
> 
> Cc: Murali Karicheri <m-karicheri2@ti.com>
> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> Cc: Bjorn Helgaas <bhelgaas@google.com>
> Cc: Minghuan Lian <minghuan.Lian@nxp.com>
> Cc: Mingkai Hu <mingkai.hu@nxp.com>
> Cc: Roy Zang <roy.zang@nxp.com>
> Cc: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
> Cc: linuxppc-dev@lists.ozlabs.org
> Acked-by: Jingoo Han <jingoohan1@gmail.com>
> Signed-off-by: Rob Herring <robh@kernel.org>
> ---
>  drivers/pci/controller/dwc/pci-keystone.c     |  9 -------
>  drivers/pci/controller/dwc/pci-layerscape.c   | 25 -------------------
>  .../pci/controller/dwc/pcie-designware-host.c | 20 +++++++++------
>  drivers/pci/controller/dwc/pcie-designware.h  |  1 +
>  drivers/pci/controller/dwc/pcie-intel-gw.c    |  9 -------
>  5 files changed, 13 insertions(+), 51 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pci-keystone.c b/drivers/pci/controller/dwc/pci-keystone.c
> index 9cf14f13798b..784385ae6074 100644
> --- a/drivers/pci/controller/dwc/pci-keystone.c
> +++ b/drivers/pci/controller/dwc/pci-keystone.c
> @@ -272,14 +272,6 @@ static void ks_pcie_handle_legacy_irq(struct keystone_pcie *ks_pcie,
>         ks_pcie_app_writel(ks_pcie, IRQ_EOI, offset);
>  }
> 
> -/*
> - * Dummy function so that DW core doesn't configure MSI
> - */
> -static int ks_pcie_am654_msi_host_init(struct pcie_port *pp)
> -{
> -       return 0;
> -}
> -
>  static void ks_pcie_enable_error_irq(struct keystone_pcie *ks_pcie)
>  {
>         ks_pcie_app_writel(ks_pcie, ERR_IRQ_ENABLE_SET, ERR_IRQ_ALL);
> @@ -854,7 +846,6 @@ static const struct dw_pcie_host_ops ks_pcie_host_ops = {
> 
>  static const struct dw_pcie_host_ops ks_pcie_am654_host_ops = {
>         .host_init = ks_pcie_host_init,
> -       .msi_host_init = ks_pcie_am654_msi_host_init,
>  };
> 
>  static irqreturn_t ks_pcie_err_irq_handler(int irq, void *priv)
> diff --git a/drivers/pci/controller/dwc/pci-layerscape.c b/drivers/pci/controller/dwc/pci-layerscape.c
> index 53e56d54c482..0d84986c4c16 100644
> --- a/drivers/pci/controller/dwc/pci-layerscape.c
> +++ b/drivers/pci/controller/dwc/pci-layerscape.c
> @@ -168,37 +168,12 @@ static int ls1021_pcie_host_init(struct pcie_port *pp)
>         return ls_pcie_host_init(pp);
>  }
> 
> -static int ls_pcie_msi_host_init(struct pcie_port *pp)
> -{
> -       struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
> -       struct device *dev = pci->dev;
> -       struct device_node *np = dev->of_node;
> -       struct device_node *msi_node;
> -
> -       /*
> -        * The MSI domain is set by the generic of_msi_configure().  This
> -        * .msi_host_init() function keeps us from doing the default MSI
> -        * domain setup in dw_pcie_host_init() and also enforces the
> -        * requirement that "msi-parent" exists.
> -        */
> -       msi_node = of_parse_phandle(np, "msi-parent", 0);
> -       if (!msi_node) {
> -               dev_err(dev, "failed to find msi-parent\n");
> -               return -EINVAL;
> -       }
> -
> -       of_node_put(msi_node);
> -       return 0;
> -}
> -
>  static const struct dw_pcie_host_ops ls1021_pcie_host_ops = {
>         .host_init = ls1021_pcie_host_init,
> -       .msi_host_init = ls_pcie_msi_host_init,
>  };
> 
>  static const struct dw_pcie_host_ops ls_pcie_host_ops = {
>         .host_init = ls_pcie_host_init,
> -       .msi_host_init = ls_pcie_msi_host_init,
>  };
> 
>  static const struct dw_pcie_ops dw_ls1021_pcie_ops = {
> diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
> index 95deef0eaadf..9b952639d020 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-host.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
> @@ -365,6 +365,10 @@ int dw_pcie_host_init(struct pcie_port *pp)
>                 pci->link_gen = of_pci_get_max_link_speed(np);
> 
>         if (pci_msi_enabled()) {
> +               pp->has_msi_ctrl = !(pp->ops->msi_host_init ||
> +                                    of_property_read_bool(np, "msi-parent") ||
> +                                    of_property_read_bool(np, "msi-map"));
> +
>                 if (!pp->num_vectors) {
>                         pp->num_vectors = MSI_DEF_NUM_VECTORS;
>                 } else if (pp->num_vectors > MAX_MSI_IRQS) {
> @@ -372,7 +376,11 @@ int dw_pcie_host_init(struct pcie_port *pp)
>                         return -EINVAL;
>                 }
> 
> -               if (!pp->ops->msi_host_init) {
> +               if (pp->ops->msi_host_init) {
> +                       ret = pp->ops->msi_host_init(pp);
> +                       if (ret < 0)
> +                               return ret;
> +               } else if (pp->has_msi_ctrl) {
>                         if (!pp->msi_irq) {
>                                 pp->msi_irq = platform_get_irq_byname_optional(pdev, "msi");
>                                 if (pp->msi_irq < 0) {
> @@ -402,10 +410,6 @@ int dw_pcie_host_init(struct pcie_port *pp)
>                                 pp->msi_data = 0;
>                                 goto err_free_msi;
>                         }
> -               } else {
> -                       ret = pp->ops->msi_host_init(pp);
> -                       if (ret < 0)
> -                               return ret;
>                 }
>         }
> 
> @@ -426,7 +430,7 @@ int dw_pcie_host_init(struct pcie_port *pp)
>                 return 0;
> 
>  err_free_msi:
> -       if (pci_msi_enabled() && !pp->ops->msi_host_init)
> +       if (pp->has_msi_ctrl)
>                 dw_pcie_free_msi(pp);
>         return ret;
>  }
> @@ -436,7 +440,7 @@ void dw_pcie_host_deinit(struct pcie_port *pp)
>  {
>         pci_stop_root_bus(pp->bridge->bus);
>         pci_remove_root_bus(pp->bridge->bus);
> -       if (pci_msi_enabled() && !pp->ops->msi_host_init)
> +       if (pp->has_msi_ctrl)
>                 dw_pcie_free_msi(pp);
>  }
>  EXPORT_SYMBOL_GPL(dw_pcie_host_deinit);
> @@ -544,7 +548,7 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
> 
>         dw_pcie_setup(pci);
> 
> -       if (pci_msi_enabled() && !pp->ops->msi_host_init) {
> +       if (pp->has_msi_ctrl) {
>                 num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL;
> 
>                 /* Initialize IRQ Status array */
> diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
> index 96382dcb2859..5d374bab10d1 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.h
> +++ b/drivers/pci/controller/dwc/pcie-designware.h
> @@ -175,6 +175,7 @@ struct dw_pcie_host_ops {
>  };
> 
>  struct pcie_port {
> +       bool                    has_msi_ctrl:1;

Can we relocate has_msi_ctrl? e.g put it at the end of the pcie_port structure.

Thanks

>         u64                     cfg0_base;
>         void __iomem            *va_cfg0_base;
>         u32                     cfg0_size;
> diff --git a/drivers/pci/controller/dwc/pcie-intel-gw.c b/drivers/pci/controller/dwc/pcie-intel-gw.c
> index c562eb7454b1..292b9de86532 100644
> --- a/drivers/pci/controller/dwc/pcie-intel-gw.c
> +++ b/drivers/pci/controller/dwc/pcie-intel-gw.c
> @@ -385,14 +385,6 @@ static int intel_pcie_rc_init(struct pcie_port *pp)
>         return intel_pcie_host_setup(lpp);
>  }
> 
> -/*
> - * Dummy function so that DW core doesn't configure MSI
> - */
> -static int intel_pcie_msi_init(struct pcie_port *pp)
> -{
> -       return 0;
> -}
> -
>  static u64 intel_pcie_cpu_addr(struct dw_pcie *pcie, u64 cpu_addr)
>  {
>         return cpu_addr + BUS_IATU_OFFSET;
> @@ -404,7 +396,6 @@ static const struct dw_pcie_ops intel_pcie_ops = {
> 
>  static const struct dw_pcie_host_ops intel_pcie_dw_ops = {
>         .host_init =            intel_pcie_rc_init,
> -       .msi_host_init =        intel_pcie_msi_init,
>  };
> 
>  static const struct intel_pcie_soc pcie_data = {
> --
> 2.25.1
> 
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
>

Re: [PATCH v2 00/16] PCI: dwc: Another round of clean-ups

[Lorenzo Pieralisi]

On Thu, 5 Nov 2020 15:11:43 -0600, Rob Herring wrote:
> Here's another batch of DWC PCI host refactoring. This series primarily
> moves more of the MSI, link up, and resource handling to the core
> code. Beyond a couple of minor fixes, new in this version is runtime
> detection of iATU regions instead of using DT properties.
> 
> No doubt I've probably broken something. Please test. I've run this thru
> kernelci and checked boards with DWC PCI which currently is just
> Layerscape boards (hint: add boards and/or enable PCI). A git branch is
> here[1].
> 
> [...]

Applied to pci/dwc, thanks!

[01/16] PCI: dwc: Support multiple ATU memory regions
        https://git.kernel.org/lpieralisi/pci/c/9f9e59a480
[02/16] PCI: dwc/intel-gw: Move ATU offset out of driver match data
        https://git.kernel.org/lpieralisi/pci/c/1d567aac46
[03/16] PCI: dwc: Move "dbi", "dbi2", and "addr_space" resource setup into common code
        https://git.kernel.org/lpieralisi/pci/c/a0fd361db8
[04/16] PCI: dwc/intel-gw: Remove some unneeded function wrappers
        https://git.kernel.org/lpieralisi/pci/c/1cc9a55999
[05/16] PCI: dwc: Ensure all outbound ATU windows are reset
        https://git.kernel.org/lpieralisi/pci/c/458ad06c4c
[06/16] PCI: dwc/dra7xx: Use the common MSI irq_chip
        https://git.kernel.org/lpieralisi/pci/c/7f170d35f5
[07/16] PCI: dwc: Drop the .set_num_vectors() host op
        https://git.kernel.org/lpieralisi/pci/c/331e9bcead
[08/16] PCI: dwc: Move MSI interrupt setup into DWC common code
        https://git.kernel.org/lpieralisi/pci/c/5bcb1757e6
[09/16] PCI: dwc: Rework MSI initialization
        https://git.kernel.org/lpieralisi/pci/c/f78f02638a
[10/16] PCI: dwc: Move link handling into common code
        https://git.kernel.org/lpieralisi/pci/c/886a9c1347
[11/16] PCI: dwc: Move dw_pcie_msi_init() into core
        https://git.kernel.org/lpieralisi/pci/c/59fbab1ae4
[12/16] PCI: dwc: Move dw_pcie_setup_rc() to DWC common code
        https://git.kernel.org/lpieralisi/pci/c/b9ac0f9dc8
[13/16] PCI: dwc: Remove unnecessary wrappers around dw_pcie_host_init()
        https://git.kernel.org/lpieralisi/pci/c/60f5b73fa0
[14/16] Revert "PCI: dwc/keystone: Drop duplicated 'num-viewport'"
        https://git.kernel.org/lpieralisi/pci/c/fcde397422
[15/16] PCI: dwc: Move inbound and outbound windows to common struct
        https://git.kernel.org/lpieralisi/pci/c/9ca17af552
[16/16] PCI: dwc: Detect number of iATU windows
        https://git.kernel.org/lpieralisi/pci/c/281f1f99cf

Thanks,
Lorenzo