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Subject[PATCH V1 3/4] PCI: tegra194: Add support to configure a pluggable slot
Date
Add support to configure a slot as a pluggable slot by not power-gating
the respective controller based on the DT property "hotplug-gpios".

Signed-off-by: Vidya Sagar <vidyas@nvidia.com>
---
drivers/pci/controller/dwc/pcie-tegra194.c | 21 ++++++++++++++-------
1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c
index 2600304522eb..0370e881422d 100644
--- a/drivers/pci/controller/dwc/pcie-tegra194.c
+++ b/drivers/pci/controller/dwc/pcie-tegra194.c
@@ -280,6 +280,8 @@ struct tegra_pcie_dw {
unsigned int phy_count;
struct phy **phys;

+ bool slot_pluggable;
+
struct dentry *debugfs;

/* Endpoint mode specific */
@@ -1089,6 +1091,7 @@ static int tegra_pcie_dw_parse_dt(struct tegra_pcie_dw *pcie)
{
struct platform_device *pdev = to_platform_device(pcie->dev);
struct device_node *np = pcie->dev->of_node;
+ struct property *prop;
int ret;

pcie->dbi_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi");
@@ -1158,6 +1161,10 @@ static int tegra_pcie_dw_parse_dt(struct tegra_pcie_dw *pcie)
pcie->enable_srns =
of_property_read_bool(np, "nvidia,enable-srns");

+ prop = of_find_property(np, "hotplug-gpios", NULL);
+ if (prop)
+ pcie->slot_pluggable = true;
+
if (pcie->of_data->mode == DW_PCIE_RC_TYPE)
return 0;

@@ -1655,7 +1662,7 @@ static int tegra_pcie_config_rp(struct tegra_pcie_dw *pcie)
}

pcie->link_state = tegra_pcie_dw_link_up(&pcie->pci);
- if (!pcie->link_state) {
+ if (!pcie->link_state && !pcie->slot_pluggable) {
ret = -ENOMEDIUM;
goto fail_host_init;
}
@@ -2267,7 +2274,7 @@ static int tegra_pcie_dw_remove(struct platform_device *pdev)
struct tegra_pcie_dw *pcie = platform_get_drvdata(pdev);

if (pcie->of_data->mode == DW_PCIE_RC_TYPE) {
- if (!pcie->link_state)
+ if (!pcie->link_state && !pcie->slot_pluggable)
return 0;

debugfs_remove_recursive(pcie->debugfs);
@@ -2296,7 +2303,7 @@ static int tegra_pcie_dw_suspend_late(struct device *dev)
return -EPERM;
}

- if (!pcie->link_state)
+ if (!pcie->link_state && !pcie->slot_pluggable)
return 0;

/* Enable HW_HOT_RST mode */
@@ -2315,7 +2322,7 @@ static int tegra_pcie_dw_suspend_noirq(struct device *dev)
{
struct tegra_pcie_dw *pcie = dev_get_drvdata(dev);

- if (!pcie->link_state)
+ if (!pcie->link_state && !pcie->slot_pluggable)
return 0;

tegra_pcie_downstream_dev_to_D0(pcie);
@@ -2330,7 +2337,7 @@ static int tegra_pcie_dw_resume_noirq(struct device *dev)
struct tegra_pcie_dw *pcie = dev_get_drvdata(dev);
int ret;

- if (!pcie->link_state)
+ if (!pcie->link_state && !pcie->slot_pluggable)
return 0;

ret = tegra_pcie_config_controller(pcie, true);
@@ -2366,7 +2373,7 @@ static int tegra_pcie_dw_resume_early(struct device *dev)
return -ENOTSUPP;
}

- if (!pcie->link_state)
+ if (!pcie->link_state && !pcie->slot_pluggable)
return 0;

/* Disable HW_HOT_RST mode */
@@ -2388,7 +2395,7 @@ static void tegra_pcie_dw_shutdown(struct platform_device *pdev)
struct tegra_pcie_dw *pcie = platform_get_drvdata(pdev);

if (pcie->of_data->mode == DW_PCIE_RC_TYPE) {
- if (!pcie->link_state)
+ if (!pcie->link_state && !pcie->slot_pluggable)
return;

debugfs_remove_recursive(pcie->debugfs);
--
2.17.1
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