[PATCH v8 0/9] DesignWare EP support and code clean up

[PATCH v8 0/9] DesignWare EP support and code clean up

[Gustavo Pimentel]

Add DesignWare EP support.

Increase maximum number of interrupts allow for DesignWare IP controller.

Does a code cleanup on DesignWare driver, which involves:
 - Replacement of magic numbers by a self-explained define to ease human
comprehension.
 - Replacement a division by 2 operation for a right shift rotation of 1
bit.
 - Replacement of all initial lowercase character in comments and debug
messages to uppercase to maintain coherence.

Gustavo Pimentel (9):
  bindings: PCI: designware: Example update
  PCI: dwc: Add support for EP mode
  PCI: endpoint: functions/pci-epf-test: Add second entry
  bindings: PCI: designware: Add support for EP in DesignWare driver
  misc: pci_endpoint_test: Add DesignWare EP entry
  PCI: dwc: Define maximum number of vectors
  PCI: dwc: Replace lower into upper case characters
  PCI: dwc: Small computation improvement
  PCI: dwc: Replace magic number by defines

 .../PCI/endpoint/function/binding/pci-test.txt     |   2 +
 .../devicetree/bindings/pci/designware-pcie.txt    |  24 +++-
 drivers/misc/pci_endpoint_test.c                   |   1 +
 drivers/pci/dwc/Kconfig                            |  41 ++++--
 drivers/pci/dwc/pcie-designware-ep.c               |  16 +--
 drivers/pci/dwc/pcie-designware-host.c             |  77 +++++-----
 drivers/pci/dwc/pcie-designware-plat.c             | 155 +++++++++++++++++++--
 drivers/pci/dwc/pcie-designware.c                  |  22 +--
 drivers/pci/dwc/pcie-designware.h                  |   1 +
 drivers/pci/endpoint/functions/pci-epf-test.c      |   8 ++
 10 files changed, 267 insertions(+), 80 deletions(-)

-- 
2.7.4

[PATCH v8 1/9] bindings: PCI: designware: Example update

[Gustavo Pimentel]

Replace "ctrlreg" reg-name by "dbi" to be coherent with similar drivers,
however it still be compatible with any previous DT that uses the old
reg-name.

Replace the PCIe base address example by a real PCIe base address in use.

Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Reviewed-by: Rob Herring <robh@kernel.org>
---
Changes v1->v2:
 - Removed any iATU reference or changes to avoid confusion.
 - Add "snps,dw-pcie" compatible string following Kishon's suggestion.
Changes v2->v3:
 - Nothing changed, just to follow the patch set version.
Changes v3->v4:
 - Reverted "snps,dw-pcie-rc" compatible string requested by Rob Herring.
Changes v4->v5:
 - Nothing changed, just to follow the patch set version.
Changes v5->v6:
 - Nothing changed, just to follow the patch set version.
Changes v6->v7:
 - Nothing changed, just to follow the patch set version.
Changes v7->v8:
 - Patch description rework for an imperative verbal mode.

 Documentation/devicetree/bindings/pci/designware-pcie.txt | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/Documentation/devicetree/bindings/pci/designware-pcie.txt b/Documentation/devicetree/bindings/pci/designware-pcie.txt
index 1da7ade..7f9804d 100644
--- a/Documentation/devicetree/bindings/pci/designware-pcie.txt
+++ b/Documentation/devicetree/bindings/pci/designware-pcie.txt
@@ -1,7 +1,8 @@
 * Synopsys DesignWare PCIe interface
 
 Required properties:
-- compatible: should contain "snps,dw-pcie" to identify the core.
+- compatible:
+	"snps,dw-pcie" for RC mode;
 - reg: Should contain the configuration address space.
 - reg-names: Must be "config" for the PCIe configuration space.
     (The old way of getting the configuration address space from "ranges"
@@ -41,11 +42,11 @@ EP mode:
 
 Example configuration:
 
-	pcie: pcie@dffff000 {
+	pcie: pcie@dfc00000 {
 		compatible = "snps,dw-pcie";
-		reg = <0xdffff000 0x1000>, /* Controller registers */
-		      <0xd0000000 0x2000>; /* PCI config space */
-		reg-names = "ctrlreg", "config";
+		reg = <0xdfc00000 0x0001000>, /* IP registers */
+		      <0xd0000000 0x0002000>; /* Configuration space */
+		reg-names = "dbi", "config";
 		#address-cells = <3>;
 		#size-cells = <2>;
 		device_type = "pci";
@@ -54,5 +55,4 @@ Example configuration:
 		interrupts = <25>, <24>;
 		#interrupt-cells = <1>;
 		num-lanes = <1>;
-		num-viewport = <3>;
 	};
-- 
2.7.4

[PATCH v8 2/9] PCI: dwc: Add support for EP mode

[Gustavo Pimentel]

The PCIe controller dual mode is capable of operating in RC mode as well
as EP mode by configuration option. Till now only RC mode was supported,
with this patch is add EP support to the DesignWare driver.

Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
---
Change v1->v2:
 - Removed dw_plat_pcie_stop_link empty function.
 - Implemented Kishon's suggestions about dw-pcie-rc and dw-pcie strings.
compatibility.
 - Added second entry on pci_epf_test_ids structure.
Changes v2->v3:
 - Reverted additions in dw_pcie_ep_linkup function.
 - Replaced devm_ioremap by devm_ioremap_resource function.
 - Moved second entry in pci_epf_test_ids structure into a new patch file.
Changes v3->v4:
 - Reverted "snps,dw-pcie-rc" compatible string requested by Rob Herring.
Changes v4->v5:
 - Nothing changed, just to follow the patch set version.
Changes v5->v6:
 - Removed PCIE_DW_PLAT entry helps and description in order to be hidden.
Changes v6->v7:
 - Nothing changed, just to follow the patch set version.
Changes v7->v8:
 - Patch description rework for an imperative verbal mode.

 drivers/pci/dwc/Kconfig                |  41 ++++++---
 drivers/pci/dwc/pcie-designware-plat.c | 149 ++++++++++++++++++++++++++++++---
 2 files changed, 169 insertions(+), 21 deletions(-)

diff --git a/drivers/pci/dwc/Kconfig b/drivers/pci/dwc/Kconfig
index 2f3f5c5..62f7cdf 100644
--- a/drivers/pci/dwc/Kconfig
+++ b/drivers/pci/dwc/Kconfig
@@ -7,8 +7,7 @@ config PCIE_DW
 
 config PCIE_DW_HOST
         bool
-	depends on PCI
-	depends on PCI_MSI_IRQ_DOMAIN
+	depends on PCI && PCI_MSI_IRQ_DOMAIN
         select PCIE_DW
 
 config PCIE_DW_EP
@@ -51,17 +50,37 @@ config PCI_DRA7XX_EP
 	  This uses the DesignWare core.
 
 config PCIE_DW_PLAT
-	bool "Platform bus based DesignWare PCIe Controller"
-	depends on PCI
-	depends on PCI_MSI_IRQ_DOMAIN
-	select PCIE_DW_HOST
-	---help---
-	 This selects the DesignWare PCIe controller support. Select this if
-	 you have a PCIe controller on Platform bus.
+	bool
 
-	 If you have a controller with this interface, say Y or M here.
+config PCIE_DW_PLAT_HOST
+	bool "Platform bus based DesignWare PCIe Controller - Host mode"
+	depends on PCI && PCI_MSI_IRQ_DOMAIN
+	select PCIE_DW_HOST
+	select PCIE_DW_PLAT
+	default y
+	help
+	  Enables support for the PCIe controller in the Designware IP to
+	  work in host mode. There are two instances of PCIe controller in
+	  Designware IP.
+	  This controller can work either as EP or RC. In order to enable
+	  host-specific features PCIE_DW_PLAT_HOST must be selected and in
+	  order to enable device-specific features PCI_DW_PLAT_EP must be
+	  selected.
 
-	 If unsure, say N.
+config PCIE_DW_PLAT_EP
+	bool "Platform bus based DesignWare PCIe Controller - Endpoint mode"
+	depends on PCI && PCI_MSI_IRQ_DOMAIN
+	depends on PCI_ENDPOINT
+	select PCIE_DW_EP
+	select PCIE_DW_PLAT
+	help
+	  Enables support for the PCIe controller in the Designware IP to
+	  work in endpoint mode. There are two instances of PCIe controller
+	  in Designware IP.
+	  This controller can work either as EP or RC. In order to enable
+	  host-specific features PCIE_DW_PLAT_HOST must be selected and in
+	  order to enable device-specific features PCI_DW_PLAT_EP must be
+	  selected.
 
 config PCI_EXYNOS
 	bool "Samsung Exynos PCIe controller"
diff --git a/drivers/pci/dwc/pcie-designware-plat.c b/drivers/pci/dwc/pcie-designware-plat.c
index 5416aa8..efc315c 100644
--- a/drivers/pci/dwc/pcie-designware-plat.c
+++ b/drivers/pci/dwc/pcie-designware-plat.c
@@ -12,19 +12,29 @@
 #include <linux/interrupt.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
+#include <linux/of_device.h>
 #include <linux/of_gpio.h>
 #include <linux/pci.h>
 #include <linux/platform_device.h>
 #include <linux/resource.h>
 #include <linux/signal.h>
 #include <linux/types.h>
+#include <linux/regmap.h>
 
 #include "pcie-designware.h"
 
 struct dw_plat_pcie {
-	struct dw_pcie		*pci;
+	struct dw_pcie			*pci;
+	struct regmap			*regmap;
+	enum dw_pcie_device_mode	mode;
 };
 
+struct dw_plat_pcie_of_data {
+	enum dw_pcie_device_mode	mode;
+};
+
+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);
@@ -42,9 +52,53 @@ static const struct dw_pcie_host_ops dw_plat_pcie_host_ops = {
 	.host_init = dw_plat_pcie_host_init,
 };
 
-static int dw_plat_add_pcie_port(struct pcie_port *pp,
+static int dw_plat_pcie_establish_link(struct dw_pcie *pci)
+{
+	return 0;
+}
+
+static const struct dw_pcie_ops dw_pcie_ops = {
+	.start_link = dw_plat_pcie_establish_link,
+};
+
+static void dw_plat_pcie_ep_init(struct dw_pcie_ep *ep)
+{
+	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
+	enum pci_barno bar;
+
+	for (bar = BAR_0; bar <= BAR_5; bar++)
+		dw_pcie_ep_reset_bar(pci, bar);
+}
+
+static int dw_plat_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
+				     enum pci_epc_irq_type type,
+				     u8 interrupt_num)
+{
+	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
+
+	switch (type) {
+	case PCI_EPC_IRQ_LEGACY:
+		dev_err(pci->dev, "EP cannot trigger legacy IRQs\n");
+		return -EINVAL;
+	case PCI_EPC_IRQ_MSI:
+		return dw_pcie_ep_raise_msi_irq(ep, func_no, interrupt_num);
+	default:
+		dev_err(pci->dev, "UNKNOWN IRQ type\n");
+	}
+
+	return 0;
+}
+
+static struct dw_pcie_ep_ops pcie_ep_ops = {
+	.ep_init = dw_plat_pcie_ep_init,
+	.raise_irq = dw_plat_pcie_ep_raise_irq,
+};
+
+static int dw_plat_add_pcie_port(struct dw_plat_pcie *dw_plat_pcie,
 				 struct platform_device *pdev)
 {
+	struct dw_pcie *pci = dw_plat_pcie->pci;
+	struct pcie_port *pp = &pci->pp;
 	struct device *dev = &pdev->dev;
 	int ret;
 
@@ -63,15 +117,44 @@ static int dw_plat_add_pcie_port(struct pcie_port *pp,
 
 	ret = dw_pcie_host_init(pp);
 	if (ret) {
-		dev_err(dev, "failed to initialize host\n");
+		dev_err(dev, "Failed to initialize host\n");
 		return ret;
 	}
 
 	return 0;
 }
 
-static const struct dw_pcie_ops dw_pcie_ops = {
-};
+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;
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi2");
+	pci->dbi_base2 = devm_ioremap_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 = 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)
 {
@@ -80,6 +163,16 @@ static int dw_plat_pcie_probe(struct platform_device *pdev)
 	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;
+	enum dw_pcie_device_mode mode;
+
+	match = of_match_device(dw_plat_pcie_of_match, dev);
+	if (!match)
+		return -EINVAL;
+
+	data = (struct dw_plat_pcie_of_data *)match->data;
+	mode = (enum dw_pcie_device_mode)data->mode;
 
 	dw_plat_pcie = devm_kzalloc(dev, sizeof(*dw_plat_pcie), GFP_KERNEL);
 	if (!dw_plat_pcie)
@@ -93,23 +186,59 @@ static int dw_plat_pcie_probe(struct platform_device *pdev)
 	pci->ops = &dw_pcie_ops;
 
 	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);
 
-	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);
 
-	ret = dw_plat_add_pcie_port(&pci->pp, pdev);
-	if (ret < 0)
-		return ret;
+	switch (dw_plat_pcie->mode) {
+	case DW_PCIE_RC_TYPE:
+		if (!IS_ENABLED(CONFIG_PCIE_DW_PLAT_HOST))
+			return -ENODEV;
+
+		ret = dw_plat_add_pcie_port(dw_plat_pcie, pdev);
+		if (ret < 0)
+			return ret;
+		break;
+	case DW_PCIE_EP_TYPE:
+		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;
+		break;
+	default:
+		dev_err(dev, "INVALID device type %d\n", dw_plat_pcie->mode);
+	}
 
 	return 0;
 }
 
+static const struct dw_plat_pcie_of_data dw_plat_pcie_rc_of_data = {
+	.mode = DW_PCIE_RC_TYPE,
+};
+
+static const struct dw_plat_pcie_of_data dw_plat_pcie_ep_of_data = {
+	.mode = DW_PCIE_EP_TYPE,
+};
+
 static const struct of_device_id dw_plat_pcie_of_match[] = {
-	{ .compatible = "snps,dw-pcie", },
+	{
+		.compatible = "snps,dw-pcie",
+		.data = &dw_plat_pcie_rc_of_data,
+	},
+	{
+		.compatible = "snps,dw-pcie-ep",
+		.data = &dw_plat_pcie_ep_of_data,
+	},
 	{},
 };
 
-- 
2.7.4

[PATCH v8 3/9] PCI: endpoint: functions/pci-epf-test: Add second entry

[Gustavo Pimentel]

Add a seconds entry on the pci_epf_test_ids structure that disables the
linkup_notifier parameter on driver for the DesignWare EP.

Allow DesignWare EPs that doesn't have linkup notification signal to work
with pcitest.

Update the binding documentation accordingly.

Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
---
Change v2->v3:
 - Added second entry in pci_epf_test_ids structure.
 - Remove test_reg_bar field assignment on second entry.
Changes v3->v4:
 - Nothing changed, just to follow the patch set version.
Changes v4->v5:
 - Changed pci_epf_test_cfg2 to pci_epf_test_designware.
Changes v5->v6:
 - Changed name field from pci_epf_test_designware to pci_epf_test_dw.
Changes v6->v7:
 - Changed variable name from data_cfg2 to data_linkup_notifier_disabled.
Changes v7->v8:
 - Patch description rework for an imperative verbal mode.

 Documentation/PCI/endpoint/function/binding/pci-test.txt | 2 ++
 drivers/pci/endpoint/functions/pci-epf-test.c            | 8 ++++++++
 2 files changed, 10 insertions(+)

diff --git a/Documentation/PCI/endpoint/function/binding/pci-test.txt b/Documentation/PCI/endpoint/function/binding/pci-test.txt
index 3b68b95..dc39f47 100644
--- a/Documentation/PCI/endpoint/function/binding/pci-test.txt
+++ b/Documentation/PCI/endpoint/function/binding/pci-test.txt
@@ -1,6 +1,8 @@
 PCI TEST ENDPOINT FUNCTION
 
 name: Should be "pci_epf_test" to bind to the pci_epf_test driver.
+name: Should be "pci_epf_test_dw" to bind to the pci_epf_test driver
+      with a custom configuration for the designware EP.
 
 Configurable Fields:
 vendorid	 : should be 0x104c
diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
index 7cef851..4ab463b 100644
--- a/drivers/pci/endpoint/functions/pci-epf-test.c
+++ b/drivers/pci/endpoint/functions/pci-epf-test.c
@@ -459,10 +459,18 @@ static int pci_epf_test_bind(struct pci_epf *epf)
 	return 0;
 }
 
+static const struct pci_epf_test_data data_linkup_notifier_disabled = {
+	.linkup_notifier = false
+};
+
 static const struct pci_epf_device_id pci_epf_test_ids[] = {
 	{
 		.name = "pci_epf_test",
 	},
+	{
+		.name = "pci_epf_test_dw",
+		.driver_data = (kernel_ulong_t)&data_linkup_notifier_disabled,
+	},
 	{},
 };
 
-- 
2.7.4

Re: [PATCH v8 3/9] PCI: endpoint: functions/pci-epf-test: Add second entry

[Lorenzo Pieralisi]

On Fri, Apr 27, 2018 at 12:59:58PM +0100, Gustavo Pimentel wrote:
> Add a seconds entry on the pci_epf_test_ids structure that disables the

"Add a second entry..."

> linkup_notifier parameter on driver for the DesignWare EP.
> 
> Allow DesignWare EPs that doesn't have linkup notification signal to work
> with pcitest.
> 
> Update the binding documentation accordingly.
> 
> Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
> Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
> ---
> Change v2->v3:
>  - Added second entry in pci_epf_test_ids structure.
>  - Remove test_reg_bar field assignment on second entry.
> Changes v3->v4:
>  - Nothing changed, just to follow the patch set version.
> Changes v4->v5:
>  - Changed pci_epf_test_cfg2 to pci_epf_test_designware.
> Changes v5->v6:
>  - Changed name field from pci_epf_test_designware to pci_epf_test_dw.
> Changes v6->v7:
>  - Changed variable name from data_cfg2 to data_linkup_notifier_disabled.
> Changes v7->v8:
>  - Patch description rework for an imperative verbal mode.
> 
>  Documentation/PCI/endpoint/function/binding/pci-test.txt | 2 ++
>  drivers/pci/endpoint/functions/pci-epf-test.c            | 8 ++++++++
>  2 files changed, 10 insertions(+)
> 
> diff --git a/Documentation/PCI/endpoint/function/binding/pci-test.txt b/Documentation/PCI/endpoint/function/binding/pci-test.txt
> index 3b68b95..dc39f47 100644
> --- a/Documentation/PCI/endpoint/function/binding/pci-test.txt
> +++ b/Documentation/PCI/endpoint/function/binding/pci-test.txt
> @@ -1,6 +1,8 @@
>  PCI TEST ENDPOINT FUNCTION
>  
>  name: Should be "pci_epf_test" to bind to the pci_epf_test driver.
> +name: Should be "pci_epf_test_dw" to bind to the pci_epf_test driver
> +      with a custom configuration for the designware EP.
>  
>  Configurable Fields:
>  vendorid	 : should be 0x104c
> diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
> index 7cef851..4ab463b 100644
> --- a/drivers/pci/endpoint/functions/pci-epf-test.c
> +++ b/drivers/pci/endpoint/functions/pci-epf-test.c
> @@ -459,10 +459,18 @@ static int pci_epf_test_bind(struct pci_epf *epf)
>  	return 0;
>  }
>  
> +static const struct pci_epf_test_data data_linkup_notifier_disabled = {
> +	.linkup_notifier = false
> +};
> +
>  static const struct pci_epf_device_id pci_epf_test_ids[] = {
>  	{
>  		.name = "pci_epf_test",
>  	},
> +	{
> +		.name = "pci_epf_test_dw",
> +		.driver_data = (kernel_ulong_t)&data_linkup_notifier_disabled,

You have not answered my question on this though:

https://marc.info/?l=linux-pci&m=152476180723047&w=2

> +	},
>  	{},
>  };
>  
> -- 
> 2.7.4
> 
> 

Re: [PATCH v8 3/9] PCI: endpoint: functions/pci-epf-test: Add second entry

[Gustavo Pimentel]

Hi Lorenzo,

On 30/04/2018 15:22, Lorenzo Pieralisi wrote:
> On Fri, Apr 27, 2018 at 12:59:58PM +0100, Gustavo Pimentel wrote:
>> Add a seconds entry on the pci_epf_test_ids structure that disables the
> 
> "Add a second entry..."

Fixed, sorry for letting it slip...

> 
>> linkup_notifier parameter on driver for the DesignWare EP.
>>
>> Allow DesignWare EPs that doesn't have linkup notification signal to work
>> with pcitest.
>>
>> Update the binding documentation accordingly.
>>
>> Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
>> Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
>> ---
>> Change v2->v3:
>>  - Added second entry in pci_epf_test_ids structure.
>>  - Remove test_reg_bar field assignment on second entry.
>> Changes v3->v4:
>>  - Nothing changed, just to follow the patch set version.
>> Changes v4->v5:
>>  - Changed pci_epf_test_cfg2 to pci_epf_test_designware.
>> Changes v5->v6:
>>  - Changed name field from pci_epf_test_designware to pci_epf_test_dw.
>> Changes v6->v7:
>>  - Changed variable name from data_cfg2 to data_linkup_notifier_disabled.
>> Changes v7->v8:
>>  - Patch description rework for an imperative verbal mode.
>>
>>  Documentation/PCI/endpoint/function/binding/pci-test.txt | 2 ++
>>  drivers/pci/endpoint/functions/pci-epf-test.c            | 8 ++++++++
>>  2 files changed, 10 insertions(+)
>>
>> diff --git a/Documentation/PCI/endpoint/function/binding/pci-test.txt b/Documentation/PCI/endpoint/function/binding/pci-test.txt
>> index 3b68b95..dc39f47 100644
>> --- a/Documentation/PCI/endpoint/function/binding/pci-test.txt
>> +++ b/Documentation/PCI/endpoint/function/binding/pci-test.txt
>> @@ -1,6 +1,8 @@
>>  PCI TEST ENDPOINT FUNCTION
>>  
>>  name: Should be "pci_epf_test" to bind to the pci_epf_test driver.
>> +name: Should be "pci_epf_test_dw" to bind to the pci_epf_test driver
>> +      with a custom configuration for the designware EP.
>>  
>>  Configurable Fields:
>>  vendorid	 : should be 0x104c
>> diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
>> index 7cef851..4ab463b 100644
>> --- a/drivers/pci/endpoint/functions/pci-epf-test.c
>> +++ b/drivers/pci/endpoint/functions/pci-epf-test.c
>> @@ -459,10 +459,18 @@ static int pci_epf_test_bind(struct pci_epf *epf)
>>  	return 0;
>>  }
>>  
>> +static const struct pci_epf_test_data data_linkup_notifier_disabled = {
>> +	.linkup_notifier = false
>> +};
>> +
>>  static const struct pci_epf_device_id pci_epf_test_ids[] = {
>>  	{
>>  		.name = "pci_epf_test",
>>  	},
>> +	{
>> +		.name = "pci_epf_test_dw",
>> +		.driver_data = (kernel_ulong_t)&data_linkup_notifier_disabled,
> 
> You have not answered my question on this though:
> 
> https://urldefense.proofpoint.com/v2/url?u=https-3A__marc.info_-3Fl-3Dlinux-2Dpci-26m-3D152476180723047-26w-3D2&d=DwIBAg&c=DPL6_X_6JkXFx7AXWqB0tg&r=bkWxpLoW-f-E3EdiDCCa0_h0PicsViasSlvIpzZvPxs&m=KsCYNT_jNohKd03qgHN_Q73bRDsN78isEgeuYF8SypU&s=N1gpsLtS4or3TlSamRxP49rYAJv6gjEq7apuhN7paLs&e=

I did not see those questions, sorry. I will respond on top of that email.

Regards,
Gustavo

> 
>> +	},
>>  	{},
>>  };
>>  
>> -- 
>> 2.7.4
>>
>>
> 

[PATCH v8 4/9] bindings: PCI: designware: Add support for EP in DesignWare driver

[Gustavo Pimentel]

Add device tree binding documentation for the EP in PCIe DesignWare driver.

Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Reviewed-by: Rob Herring <robh@kernel.org>
---
Change v1->v2:
 - Add a missing log description.
 - Add "snps,dw-pcie" compatible string following Kishon's suggestion.
Change v2->v3:
 - Reverted pcie_ep name to pcie.
Changes v3->v4:
 - Reverted "snps,dw-pcie-rc" compatible string requested by Rob Herring.
Changes v4->v5:
 - Removed device_type entry from EP requested by Rob Herring.
Changes v5->v6:
 - Nothing changed, just to follow the patch set version.
Changes v6->v7:
 - Nothing changed, just to follow the patch set version.
Changes v7->v8:
 - Patch description rework for an imperative verbal mode.

 Documentation/devicetree/bindings/pci/designware-pcie.txt | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/Documentation/devicetree/bindings/pci/designware-pcie.txt b/Documentation/devicetree/bindings/pci/designware-pcie.txt
index 7f9804d..c124f9b 100644
--- a/Documentation/devicetree/bindings/pci/designware-pcie.txt
+++ b/Documentation/devicetree/bindings/pci/designware-pcie.txt
@@ -3,6 +3,7 @@
 Required properties:
 - compatible:
 	"snps,dw-pcie" for RC mode;
+	"snps,dw-pcie-ep" for EP mode;
 - reg: Should contain the configuration address space.
 - reg-names: Must be "config" for the PCIe configuration space.
     (The old way of getting the configuration address space from "ranges"
@@ -56,3 +57,14 @@ Example configuration:
 		#interrupt-cells = <1>;
 		num-lanes = <1>;
 	};
+or
+	pcie: pcie@dfc00000 {
+		compatible = "snps,dw-pcie-ep";
+		reg = <0xdfc00000 0x0001000>, /* IP registers 1 */
+		      <0xdfc01000 0x0001000>, /* IP registers 2 */
+		      <0xd0000000 0x2000000>; /* Configuration space */
+		reg-names = "dbi", "dbi2", "addr_space";
+		num-ib-windows = <6>;
+		num-ob-windows = <2>;
+		num-lanes = <1>;
+	};
-- 
2.7.4

[PATCH v8 5/9] misc: pci_endpoint_test: Add DesignWare EP entry

[Gustavo Pimentel]

Add the DesignWare EP device ID entry to pci_endpoint_test driver table.

Allow the device to be recognize and handle by the pci_endpoint_test
driver.

Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
---
Change v1->v2:
 - Changed device id following Kishon's suggestion.
Change v2->v3:
 - Nothing changed, just to follow the patch set version.
Changes v3->v4:
 - Nothing changed, just to follow the patch set version.
Changes v4->v5:
 - Nothing changed, just to follow the patch set version.
Changes v5->v6:
 - Reverted Kishon's suggestion by Bjorn request.
Changes v6->v7:
 - Nothing changed, just to follow the patch set version.
Changes v7->v8:
 - Patch description rework for an imperative verbal mode.

 drivers/misc/pci_endpoint_test.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/misc/pci_endpoint_test.c b/drivers/misc/pci_endpoint_test.c
index fe8897e..58a88ba 100644
--- a/drivers/misc/pci_endpoint_test.c
+++ b/drivers/misc/pci_endpoint_test.c
@@ -634,6 +634,7 @@ static void pci_endpoint_test_remove(struct pci_dev *pdev)
 static const struct pci_device_id pci_endpoint_test_tbl[] = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_DRA74x) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_DRA72x) },
+	{ PCI_DEVICE(PCI_VENDOR_ID_SYNOPSYS, 0xedda) },
 	{ }
 };
 MODULE_DEVICE_TABLE(pci, pci_endpoint_test_tbl);
-- 
2.7.4

[PATCH v8 6/9] PCI: dwc: Define maximum number of vectors

[Gustavo Pimentel]

Add a callback to define the maximum number of vectors used by the RC.

Since this is a parameter associated to each SoC IP setting, makes sense
to be configurable and easily visible to future modifications.

Set DesignWare driver vectors number maximum to 256.

Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Acked-by: Joao Pinto <jpinto@synopsys.com>
Acked-by: Jingoo Han <jingoohan1@gmail.com>
---
Change v1->v2:
 - Nothing changed, just to follow the patch set version.
Change v2->v3:
 - Nothing changed, just to follow the patch set version.
Changes v3->v4:
 - Nothing changed, just to follow the patch set version.
Changes v4->v5:
 - Nothing changed, just to follow the patch set version.
Changes v5->v6:
 - Nothing changed, just to follow the patch set version.
Changes v6->v7:
 - Nothing changed, just to follow the patch set version.
Changes v7->v8:
 - Patch description rework for an imperative verbal mode.

 drivers/pci/dwc/pcie-designware-plat.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/pci/dwc/pcie-designware-plat.c b/drivers/pci/dwc/pcie-designware-plat.c
index efc315c..5937fed 100644
--- a/drivers/pci/dwc/pcie-designware-plat.c
+++ b/drivers/pci/dwc/pcie-designware-plat.c
@@ -48,8 +48,14 @@ 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)
-- 
2.7.4

[PATCH v8 7/9] PCI: dwc: Replace lower into upper case characters

[Gustavo Pimentel]

Replace of all initial lowercase character in comments and debug messages
to uppercase to maintain coherence.

Fix messages coherence within the DesignWare driver.

Fix code style on dw_pcie_irq_domain_free() function.

Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Acked-by: Jingoo Han <jingoohan1@gmail.com>
Acked-by: Joao Pinto <jpinto@synopsys.com>
---
Change v1->v2:
 - Added an extra log description line about code style following Fabio
Estevam suggestion.
Change v2->v3:
 - Nothing changed, just to follow the patch set version.
Changes v3->v4:
 - Nothing changed, just to follow the patch set version.
Changes v4->v5:
 - Nothing changed, just to follow the patch set version.
Changes v5->v6:
 - Nothing changed, just to follow the patch set version.
Changes v6->v7:
 - Nothing changed, just to follow the patch set version.
Changes v7->v8:
 - Patch description rework for an imperative verbal mode.

 drivers/pci/dwc/pcie-designware-ep.c   | 16 ++++++++--------
 drivers/pci/dwc/pcie-designware-host.c | 35 ++++++++++++++++++----------------
 drivers/pci/dwc/pcie-designware.c      | 22 ++++++++++-----------
 3 files changed, 38 insertions(+), 35 deletions(-)

diff --git a/drivers/pci/dwc/pcie-designware-ep.c b/drivers/pci/dwc/pcie-designware-ep.c
index f07678b..15b22a6 100644
--- a/drivers/pci/dwc/pcie-designware-ep.c
+++ b/drivers/pci/dwc/pcie-designware-ep.c
@@ -75,7 +75,7 @@ static int dw_pcie_ep_inbound_atu(struct dw_pcie_ep *ep, enum pci_barno bar,
 
 	free_win = find_first_zero_bit(ep->ib_window_map, ep->num_ib_windows);
 	if (free_win >= ep->num_ib_windows) {
-		dev_err(pci->dev, "no free inbound window\n");
+		dev_err(pci->dev, "No free inbound window\n");
 		return -EINVAL;
 	}
 
@@ -100,7 +100,7 @@ static int dw_pcie_ep_outbound_atu(struct dw_pcie_ep *ep, phys_addr_t phys_addr,
 
 	free_win = find_first_zero_bit(ep->ob_window_map, ep->num_ob_windows);
 	if (free_win >= ep->num_ob_windows) {
-		dev_err(pci->dev, "no free outbound window\n");
+		dev_err(pci->dev, "No free outbound window\n");
 		return -EINVAL;
 	}
 
@@ -204,7 +204,7 @@ static int dw_pcie_ep_map_addr(struct pci_epc *epc, u8 func_no,
 
 	ret = dw_pcie_ep_outbound_atu(ep, addr, pci_addr, size);
 	if (ret) {
-		dev_err(pci->dev, "failed to enable address\n");
+		dev_err(pci->dev, "Failed to enable address\n");
 		return ret;
 	}
 
@@ -348,21 +348,21 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep)
 
 	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");
+		dev_err(dev, "Unable to read *num-ib-windows* property\n");
 		return ret;
 	}
 	if (ep->num_ib_windows > MAX_IATU_IN) {
-		dev_err(dev, "invalid *num-ib-windows*\n");
+		dev_err(dev, "Invalid *num-ib-windows*\n");
 		return -EINVAL;
 	}
 
 	ret = of_property_read_u32(np, "num-ob-windows", &ep->num_ob_windows);
 	if (ret < 0) {
-		dev_err(dev, "unable to read *num-ob-windows* property\n");
+		dev_err(dev, "Unable to read *num-ob-windows* property\n");
 		return ret;
 	}
 	if (ep->num_ob_windows > MAX_IATU_OUT) {
-		dev_err(dev, "invalid *num-ob-windows*\n");
+		dev_err(dev, "Invalid *num-ob-windows*\n");
 		return -EINVAL;
 	}
 
@@ -389,7 +389,7 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep)
 
 	epc = devm_pci_epc_create(dev, &epc_ops);
 	if (IS_ERR(epc)) {
-		dev_err(dev, "failed to create epc device\n");
+		dev_err(dev, "Failed to create epc device\n");
 		return PTR_ERR(epc);
 	}
 
diff --git a/drivers/pci/dwc/pcie-designware-host.c b/drivers/pci/dwc/pcie-designware-host.c
index 6c409079..5a23f78 100644
--- a/drivers/pci/dwc/pcie-designware-host.c
+++ b/drivers/pci/dwc/pcie-designware-host.c
@@ -248,8 +248,10 @@ static void dw_pcie_irq_domain_free(struct irq_domain *domain,
 	unsigned long flags;
 
 	raw_spin_lock_irqsave(&pp->lock, flags);
+
 	bitmap_release_region(pp->msi_irq_in_use, data->hwirq,
 			      order_base_2(nr_irqs));
+
 	raw_spin_unlock_irqrestore(&pp->lock, flags);
 }
 
@@ -266,7 +268,7 @@ int dw_pcie_allocate_domains(struct pcie_port *pp)
 	pp->irq_domain = irq_domain_create_linear(fwnode, pp->num_vectors,
 					       &dw_pcie_msi_domain_ops, pp);
 	if (!pp->irq_domain) {
-		dev_err(pci->dev, "failed to create IRQ domain\n");
+		dev_err(pci->dev, "Failed to create IRQ domain\n");
 		return -ENOMEM;
 	}
 
@@ -274,7 +276,7 @@ int dw_pcie_allocate_domains(struct pcie_port *pp)
 						   &dw_pcie_msi_domain_info,
 						   pp->irq_domain);
 	if (!pp->msi_domain) {
-		dev_err(pci->dev, "failed to create MSI domain\n");
+		dev_err(pci->dev, "Failed to create MSI domain\n");
 		irq_domain_remove(pp->irq_domain);
 		return -ENOMEM;
 	}
@@ -301,13 +303,13 @@ void dw_pcie_msi_init(struct pcie_port *pp)
 	page = alloc_page(GFP_KERNEL);
 	pp->msi_data = dma_map_page(dev, page, 0, PAGE_SIZE, DMA_FROM_DEVICE);
 	if (dma_mapping_error(dev, pp->msi_data)) {
-		dev_err(dev, "failed to map MSI data\n");
+		dev_err(dev, "Failed to map MSI data\n");
 		__free_page(page);
 		return;
 	}
 	msi_target = (u64)pp->msi_data;
 
-	/* program the msi_data */
+	/* Program the msi_data */
 	dw_pcie_wr_own_conf(pp, PCIE_MSI_ADDR_LO, 4,
 			    lower_32_bits(msi_target));
 	dw_pcie_wr_own_conf(pp, PCIE_MSI_ADDR_HI, 4,
@@ -335,7 +337,7 @@ int dw_pcie_host_init(struct pcie_port *pp)
 		pp->cfg0_base = cfg_res->start;
 		pp->cfg1_base = cfg_res->start + pp->cfg0_size;
 	} else if (!pp->va_cfg0_base) {
-		dev_err(dev, "missing *config* reg space\n");
+		dev_err(dev, "Missing *config* reg space\n");
 	}
 
 	bridge = pci_alloc_host_bridge(0);
@@ -357,7 +359,7 @@ int dw_pcie_host_init(struct pcie_port *pp)
 		case IORESOURCE_IO:
 			ret = pci_remap_iospace(win->res, pp->io_base);
 			if (ret) {
-				dev_warn(dev, "error %d: failed to map resource %pR\n",
+				dev_warn(dev, "Error %d: failed to map resource %pR\n",
 					 ret, win->res);
 				resource_list_destroy_entry(win);
 			} else {
@@ -391,7 +393,7 @@ int dw_pcie_host_init(struct pcie_port *pp)
 						pp->cfg->start,
 						resource_size(pp->cfg));
 		if (!pci->dbi_base) {
-			dev_err(dev, "error with ioremap\n");
+			dev_err(dev, "Error with ioremap\n");
 			ret = -ENOMEM;
 			goto error;
 		}
@@ -403,7 +405,7 @@ int dw_pcie_host_init(struct pcie_port *pp)
 		pp->va_cfg0_base = devm_pci_remap_cfgspace(dev,
 					pp->cfg0_base, pp->cfg0_size);
 		if (!pp->va_cfg0_base) {
-			dev_err(dev, "error with ioremap in function\n");
+			dev_err(dev, "Error with ioremap in function\n");
 			ret = -ENOMEM;
 			goto error;
 		}
@@ -414,7 +416,7 @@ int dw_pcie_host_init(struct pcie_port *pp)
 						pp->cfg1_base,
 						pp->cfg1_size);
 		if (!pp->va_cfg1_base) {
-			dev_err(dev, "error with ioremap\n");
+			dev_err(dev, "Error with ioremap\n");
 			ret = -ENOMEM;
 			goto error;
 		}
@@ -586,7 +588,7 @@ static int dw_pcie_valid_device(struct pcie_port *pp, struct pci_bus *bus,
 			return 0;
 	}
 
-	/* access only one slot on each root port */
+	/* Access only one slot on each root port */
 	if (bus->number == pp->root_bus_nr && dev > 0)
 		return 0;
 
@@ -652,11 +654,12 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
 	for (ctrl = 0; ctrl < num_ctrls; ctrl++)
 		dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_ENABLE + (ctrl * 12), 4,
 				    &pp->irq_status[ctrl]);
-	/* setup RC BARs */
+
+	/* Setup RC BARs */
 	dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, 0x00000004);
 	dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_1, 0x00000000);
 
-	/* setup interrupt pins */
+	/* Setup interrupt pins */
 	dw_pcie_dbi_ro_wr_en(pci);
 	val = dw_pcie_readl_dbi(pci, PCI_INTERRUPT_LINE);
 	val &= 0xffff00ff;
@@ -664,13 +667,13 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
 	dw_pcie_writel_dbi(pci, PCI_INTERRUPT_LINE, val);
 	dw_pcie_dbi_ro_wr_dis(pci);
 
-	/* setup bus numbers */
+	/* Setup bus numbers */
 	val = dw_pcie_readl_dbi(pci, PCI_PRIMARY_BUS);
 	val &= 0xff000000;
 	val |= 0x00ff0100;
 	dw_pcie_writel_dbi(pci, PCI_PRIMARY_BUS, val);
 
-	/* setup command register */
+	/* Setup command register */
 	val = dw_pcie_readl_dbi(pci, PCI_COMMAND);
 	val &= 0xffff0000;
 	val |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
@@ -683,7 +686,7 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
 	 * we should not program the ATU here.
 	 */
 	if (!pp->ops->rd_other_conf) {
-		/* get iATU unroll support */
+		/* Get iATU unroll support */
 		pci->iatu_unroll_enabled = dw_pcie_iatu_unroll_enabled(pci);
 		dev_dbg(pci->dev, "iATU unroll: %s\n",
 			pci->iatu_unroll_enabled ? "enabled" : "disabled");
@@ -701,7 +704,7 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
 
 	/* Enable write permission for the DBI read-only register */
 	dw_pcie_dbi_ro_wr_en(pci);
-	/* program correct class for RC */
+	/* Program correct class for RC */
 	dw_pcie_wr_own_conf(pp, PCI_CLASS_DEVICE, 2, PCI_CLASS_BRIDGE_PCI);
 	/* Better disable write permission right after the update */
 	dw_pcie_dbi_ro_wr_dis(pci);
diff --git a/drivers/pci/dwc/pcie-designware.c b/drivers/pci/dwc/pcie-designware.c
index 1b7282e..778c4f7 100644
--- a/drivers/pci/dwc/pcie-designware.c
+++ b/drivers/pci/dwc/pcie-designware.c
@@ -69,7 +69,7 @@ u32 __dw_pcie_read_dbi(struct dw_pcie *pci, void __iomem *base, u32 reg,
 
 	ret = dw_pcie_read(base + reg, size, &val);
 	if (ret)
-		dev_err(pci->dev, "read DBI address failed\n");
+		dev_err(pci->dev, "Read DBI address failed\n");
 
 	return val;
 }
@@ -86,7 +86,7 @@ void __dw_pcie_write_dbi(struct dw_pcie *pci, void __iomem *base, u32 reg,
 
 	ret = dw_pcie_write(base + reg, size, val);
 	if (ret)
-		dev_err(pci->dev, "write DBI address failed\n");
+		dev_err(pci->dev, "Write DBI address failed\n");
 }
 
 static u32 dw_pcie_readl_ob_unroll(struct dw_pcie *pci, u32 index, u32 reg)
@@ -137,7 +137,7 @@ static void dw_pcie_prog_outbound_atu_unroll(struct dw_pcie *pci, int index,
 
 		usleep_range(LINK_WAIT_IATU_MIN, LINK_WAIT_IATU_MAX);
 	}
-	dev_err(pci->dev, "outbound iATU is not being enabled\n");
+	dev_err(pci->dev, "Outbound iATU is not being enabled\n");
 }
 
 void dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index, int type,
@@ -180,7 +180,7 @@ void dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index, int type,
 
 		usleep_range(LINK_WAIT_IATU_MIN, LINK_WAIT_IATU_MAX);
 	}
-	dev_err(pci->dev, "outbound iATU is not being enabled\n");
+	dev_err(pci->dev, "Outbound iATU is not being enabled\n");
 }
 
 static u32 dw_pcie_readl_ib_unroll(struct dw_pcie *pci, u32 index, u32 reg)
@@ -238,7 +238,7 @@ static int dw_pcie_prog_inbound_atu_unroll(struct dw_pcie *pci, int index,
 
 		usleep_range(LINK_WAIT_IATU_MIN, LINK_WAIT_IATU_MAX);
 	}
-	dev_err(pci->dev, "inbound iATU is not being enabled\n");
+	dev_err(pci->dev, "Inbound iATU is not being enabled\n");
 
 	return -EBUSY;
 }
@@ -284,7 +284,7 @@ int dw_pcie_prog_inbound_atu(struct dw_pcie *pci, int index, int bar,
 
 		usleep_range(LINK_WAIT_IATU_MIN, LINK_WAIT_IATU_MAX);
 	}
-	dev_err(pci->dev, "inbound iATU is not being enabled\n");
+	dev_err(pci->dev, "Inbound iATU is not being enabled\n");
 
 	return -EBUSY;
 }
@@ -313,16 +313,16 @@ int dw_pcie_wait_for_link(struct dw_pcie *pci)
 {
 	int retries;
 
-	/* check if the link is up or not */
+	/* Check if the link is up or not */
 	for (retries = 0; retries < LINK_WAIT_MAX_RETRIES; retries++) {
 		if (dw_pcie_link_up(pci)) {
-			dev_info(pci->dev, "link up\n");
+			dev_info(pci->dev, "Link up\n");
 			return 0;
 		}
 		usleep_range(LINK_WAIT_USLEEP_MIN, LINK_WAIT_USLEEP_MAX);
 	}
 
-	dev_err(pci->dev, "phy link never came up\n");
+	dev_err(pci->dev, "Phy link never came up\n");
 
 	return -ETIMEDOUT;
 }
@@ -351,7 +351,7 @@ void dw_pcie_setup(struct dw_pcie *pci)
 	if (ret)
 		lanes = 0;
 
-	/* set the number of lanes */
+	/* Set the number of lanes */
 	val = dw_pcie_readl_dbi(pci, PCIE_PORT_LINK_CONTROL);
 	val &= ~PORT_LINK_MODE_MASK;
 	switch (lanes) {
@@ -373,7 +373,7 @@ void dw_pcie_setup(struct dw_pcie *pci)
 	}
 	dw_pcie_writel_dbi(pci, PCIE_PORT_LINK_CONTROL, val);
 
-	/* set link width speed control register */
+	/* Set link width speed control register */
 	val = dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL);
 	val &= ~PORT_LOGIC_LINK_WIDTH_MASK;
 	switch (lanes) {
-- 
2.7.4

[PATCH v8 8/9] PCI: dwc: Small computation improvement

[Gustavo Pimentel]

Replace a division by 2 operation for a right shift rotation of 1 bit.

Probably any recent and decent compiler does this kind of substitution
in order to improve code performance. Nevertheless it's a coding good
practice whenever there is a division / multiplication by multiple of 2
to replace it by the equivalent operation in this case, the shift
rotation.

Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Acked-by: Jingoo Han <jingoohan1@gmail.com>
Acked-by: Joao Pinto <jpinto@synopsys.com>
---
Change v1->v2:
 - Nothing changed, just to follow the patch set version.
Change v2->v3:
 - Nothing changed, just to follow the patch set version.
Changes v3->v4:
 - Added a small explication to the log description.
Changes v4->v5:
 - Nothing changed, just to follow the patch set version.
Changes v5->v6:
 - Nothing changed, just to follow the patch set version.
Changes v6->v7:
 - Nothing changed, just to follow the patch set version.
Changes v7->v8:
 - Patch description rework for an imperative verbal mode.

 drivers/pci/dwc/pcie-designware-host.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/dwc/pcie-designware-host.c b/drivers/pci/dwc/pcie-designware-host.c
index 5a23f78..fc55fde 100644
--- a/drivers/pci/dwc/pcie-designware-host.c
+++ b/drivers/pci/dwc/pcie-designware-host.c
@@ -332,8 +332,8 @@ int dw_pcie_host_init(struct pcie_port *pp)
 
 	cfg_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "config");
 	if (cfg_res) {
-		pp->cfg0_size = resource_size(cfg_res) / 2;
-		pp->cfg1_size = resource_size(cfg_res) / 2;
+		pp->cfg0_size = resource_size(cfg_res) >> 1;
+		pp->cfg1_size = resource_size(cfg_res) >> 1;
 		pp->cfg0_base = cfg_res->start;
 		pp->cfg1_base = cfg_res->start + pp->cfg0_size;
 	} else if (!pp->va_cfg0_base) {
@@ -377,8 +377,8 @@ int dw_pcie_host_init(struct pcie_port *pp)
 			break;
 		case 0:
 			pp->cfg = win->res;
-			pp->cfg0_size = resource_size(pp->cfg) / 2;
-			pp->cfg1_size = resource_size(pp->cfg) / 2;
+			pp->cfg0_size = resource_size(pp->cfg) >> 1;
+			pp->cfg1_size = resource_size(pp->cfg) >> 1;
 			pp->cfg0_base = pp->cfg->start;
 			pp->cfg1_base = pp->cfg->start + pp->cfg0_size;
 			break;
-- 
2.7.4

[PATCH v8 9/9] PCI: dwc: Replace magic number by defines

[Gustavo Pimentel]

Replace magic numbers by a self-explained define to ease human
comprehension.

Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Acked-by: Jingoo Han <jingoohan1@gmail.com>
---
Change v1->v2:
 - Nothing changed, just to follow the patch set version.
Change v2->v3:
 - Nothing changed, just to follow the patch set version.
Changes v3->v4:
 - Nothing changed, just to follow the patch set version.
Changes v4->v5:
 - Nothing changed, just to follow the patch set version.
Changes v5->v6:
 - Nothing changed, just to follow the patch set version.
Changes v6->v7:
 - Nothing changed, just to follow the patch set version.
Changes v7->v8:
 - Patch description rework for an imperative verbal mode.

 drivers/pci/dwc/pcie-designware-host.c | 34 ++++++++++++++++++++--------------
 drivers/pci/dwc/pcie-designware.h      |  1 +
 2 files changed, 21 insertions(+), 14 deletions(-)

diff --git a/drivers/pci/dwc/pcie-designware-host.c b/drivers/pci/dwc/pcie-designware-host.c
index fc55fde..a7657ab 100644
--- a/drivers/pci/dwc/pcie-designware-host.c
+++ b/drivers/pci/dwc/pcie-designware-host.c
@@ -83,18 +83,23 @@ irqreturn_t dw_handle_msi_irq(struct pcie_port *pp)
 	num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL;
 
 	for (i = 0; i < num_ctrls; i++) {
-		dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_STATUS + i * 12, 4,
-				    &val);
+		dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_STATUS +
+					(i * MSI_REG_CTRL_BLOCK_SIZE),
+				    4, &val);
 		if (!val)
 			continue;
 
 		ret = IRQ_HANDLED;
 		pos = 0;
-		while ((pos = find_next_bit((unsigned long *) &val, 32,
-					    pos)) != 32) {
-			irq = irq_find_mapping(pp->irq_domain, i * 32 + pos);
+		while ((pos = find_next_bit((unsigned long *) &val,
+					    MAX_MSI_IRQS_PER_CTRL,
+					    pos)) != MAX_MSI_IRQS_PER_CTRL) {
+			irq = irq_find_mapping(pp->irq_domain,
+					       (i * MAX_MSI_IRQS_PER_CTRL) +
+					       pos);
 			generic_handle_irq(irq);
-			dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_STATUS + i * 12,
+			dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_STATUS +
+						(i * MSI_REG_CTRL_BLOCK_SIZE),
 					    4, 1 << pos);
 			pos++;
 		}
@@ -157,9 +162,9 @@ static void dw_pci_bottom_mask(struct irq_data *data)
 	if (pp->ops->msi_clear_irq) {
 		pp->ops->msi_clear_irq(pp, data->hwirq);
 	} else {
-		ctrl = data->hwirq / 32;
-		res = ctrl * 12;
-		bit = data->hwirq % 32;
+		ctrl = data->hwirq / MAX_MSI_IRQS_PER_CTRL;
+		res = ctrl * MSI_REG_CTRL_BLOCK_SIZE;
+		bit = data->hwirq % MAX_MSI_IRQS_PER_CTRL;
 
 		pp->irq_status[ctrl] &= ~(1 << bit);
 		dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4,
@@ -180,9 +185,9 @@ static void dw_pci_bottom_unmask(struct irq_data *data)
 	if (pp->ops->msi_set_irq) {
 		pp->ops->msi_set_irq(pp, data->hwirq);
 	} else {
-		ctrl = data->hwirq / 32;
-		res = ctrl * 12;
-		bit = data->hwirq % 32;
+		ctrl = data->hwirq / MAX_MSI_IRQS_PER_CTRL;
+		res = ctrl * MSI_REG_CTRL_BLOCK_SIZE;
+		bit = data->hwirq % MAX_MSI_IRQS_PER_CTRL;
 
 		pp->irq_status[ctrl] |= 1 << bit;
 		dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4,
@@ -652,8 +657,9 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
 
 	/* Initialize IRQ Status array */
 	for (ctrl = 0; ctrl < num_ctrls; ctrl++)
-		dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_ENABLE + (ctrl * 12), 4,
-				    &pp->irq_status[ctrl]);
+		dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_ENABLE +
+					(ctrl * MSI_REG_CTRL_BLOCK_SIZE),
+				    4, &pp->irq_status[ctrl]);
 
 	/* Setup RC BARs */
 	dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, 0x00000004);
diff --git a/drivers/pci/dwc/pcie-designware.h b/drivers/pci/dwc/pcie-designware.h
index fe811db..bee4e25 100644
--- a/drivers/pci/dwc/pcie-designware.h
+++ b/drivers/pci/dwc/pcie-designware.h
@@ -110,6 +110,7 @@
 #define MAX_MSI_IRQS			256
 #define MAX_MSI_IRQS_PER_CTRL		32
 #define MAX_MSI_CTRLS			(MAX_MSI_IRQS / MAX_MSI_IRQS_PER_CTRL)
+#define MSI_REG_CTRL_BLOCK_SIZE		12
 #define MSI_DEF_NUM_VECTORS		32
 
 /* Maximum number of inbound/outbound iATUs */
-- 
2.7.4