@@ -562,14 +562,25 @@ static int tegra_pcie_request_resources(struct tegra_pcie *pcie)
pci_add_resource(windows, &pcie->busn);
err = devm_request_pci_bus_resources(dev, windows);
- if (err < 0)
+ if (err < 0) {
+ pci_free_resource_list(windows);
return err;
+ }
pci_remap_iospace(&pcie->pio, pcie->io.start);
return 0;
}
+static void tegra_pcie_free_resources(struct tegra_pcie *pcie)
+{
+ struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);
+ struct list_head *windows = &host->windows;
+
+ pci_unmap_iospace(&pcie->pio);
+ pci_free_resource_list(windows);
+}
+
static int tegra_pcie_map_irq(const struct pci_dev *pdev, u8 slot, u8 pin)
{
struct tegra_pcie *pcie = pdev->bus->sysdata;
@@ -979,24 +990,35 @@ static int tegra_pcie_enable_controller(struct tegra_pcie *pcie)
return 0;
}
-static void tegra_pcie_power_off(struct tegra_pcie *pcie)
+static void tegra_pcie_disable_controller(struct tegra_pcie *pcie)
{
- struct device *dev = pcie->dev;
- const struct tegra_pcie_soc *soc = pcie->soc;
int err;
- /* TODO: disable and unprepare clocks? */
+ reset_control_assert(pcie->pcie_xrst);
- if (soc->program_uphy) {
+ if (pcie->soc->program_uphy) {
err = tegra_pcie_phy_power_off(pcie);
if (err < 0)
- dev_err(dev, "failed to power off PHY(s): %d\n", err);
+ dev_err(pcie->dev, "failed to power off PHY(s): %d\n",
+ err);
}
+}
+
+static void tegra_pcie_power_off(struct tegra_pcie *pcie)
+{
+ struct device *dev = pcie->dev;
+ const struct tegra_pcie_soc *soc = pcie->soc;
+ int err;
- reset_control_assert(pcie->pcie_xrst);
reset_control_assert(pcie->afi_rst);
reset_control_assert(pcie->pex_rst);
+ clk_disable_unprepare(pcie->pll_e);
+ if (soc->has_cml_clk)
+ clk_disable_unprepare(pcie->cml_clk);
+ clk_disable_unprepare(pcie->afi_clk);
+ clk_disable_unprepare(pcie->pex_clk);
+
if (!dev->pm_domain)
tegra_powergate_power_off(TEGRA_POWERGATE_PCIE);
@@ -1205,6 +1227,30 @@ static int tegra_pcie_phys_get(struct tegra_pcie *pcie)
return 0;
}
+static void tegra_pcie_phys_put(struct tegra_pcie *pcie)
+{
+ struct tegra_pcie_port *port;
+ struct device *dev = pcie->dev;
+ int err, i;
+
+ if (pcie->legacy_phy) {
+ err = phy_exit(pcie->phy);
+ if (err < 0)
+ dev_err(dev, "failed to teardown PHY: %d\n", err);
+ return;
+ }
+
+ list_for_each_entry(port, &pcie->ports, list) {
+ for (i = 0; i < port->lanes; i++) {
+ err = phy_exit(port->phys[i]);
+ if (err < 0)
+ dev_err(dev, "failed to teardown PHY#%u: %d\n",
+ i, err);
+ }
+ }
+}
+
+
static int tegra_pcie_get_resources(struct tegra_pcie *pcie)
{
struct device *dev = pcie->dev;
@@ -1236,7 +1282,7 @@ static int tegra_pcie_get_resources(struct tegra_pcie *pcie)
err = tegra_pcie_power_on(pcie);
if (err) {
dev_err(dev, "failed to power up: %d\n", err);
- return err;
+ goto phys_put;
}
pads = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pads");
@@ -1288,6 +1334,9 @@ static int tegra_pcie_get_resources(struct tegra_pcie *pcie)
return 0;
+phys_put:
+ if (soc->program_uphy)
+ tegra_pcie_phys_put(pcie);
poweroff:
tegra_pcie_power_off(pcie);
return err;
@@ -1295,20 +1344,15 @@ static int tegra_pcie_get_resources(struct tegra_pcie *pcie)
static int tegra_pcie_put_resources(struct tegra_pcie *pcie)
{
- struct device *dev = pcie->dev;
const struct tegra_pcie_soc *soc = pcie->soc;
- int err;
if (pcie->irq > 0)
free_irq(pcie->irq, pcie);
tegra_pcie_power_off(pcie);
- if (soc->program_uphy) {
- err = phy_exit(pcie->phy);
- if (err < 0)
- dev_err(dev, "failed to teardown PHY: %d\n", err);
- }
+ if (soc->program_uphy)
+ tegra_pcie_phys_put(pcie);
return 0;
}
@@ -2048,6 +2092,16 @@ static void tegra_pcie_enable_ports(struct tegra_pcie *pcie)
}
}
+static void tegra_pcie_disable_ports(struct tegra_pcie *pcie)
+{
+ struct tegra_pcie_port *port, *tmp;
+
+ list_for_each_entry_safe(port, tmp, &pcie->ports, list) {
+ tegra_pcie_port_disable(port);
+ tegra_pcie_port_free(port);
+ }
+}
+
static const struct tegra_pcie_soc tegra20_pcie = {
.num_ports = 2,
.msi_base_shift = 0,
@@ -2278,7 +2332,7 @@ static int tegra_pcie_probe(struct platform_device *pdev)
err = tegra_pcie_request_resources(pcie);
if (err)
- goto put_resources;
+ goto disable_controller;
/* setup the AFI address translations */
tegra_pcie_setup_translations(pcie);
@@ -2287,7 +2341,7 @@ static int tegra_pcie_probe(struct platform_device *pdev)
err = tegra_pcie_enable_msi(pcie);
if (err < 0) {
dev_err(dev, "failed to enable MSI support: %d\n", err);
- goto put_resources;
+ goto free_resources;
}
}
@@ -2302,7 +2356,7 @@ static int tegra_pcie_probe(struct platform_device *pdev)
err = pci_scan_root_bus_bridge(host);
if (err < 0) {
dev_err(dev, "failed to register host: %d\n", err);
- goto disable_msi;
+ goto disable_ports;
}
pci_bus_size_bridges(host->bus);
@@ -2321,9 +2375,14 @@ static int tegra_pcie_probe(struct platform_device *pdev)
return 0;
-disable_msi:
+disable_ports:
+ tegra_pcie_disable_ports(pcie);
if (IS_ENABLED(CONFIG_PCI_MSI))
tegra_pcie_disable_msi(pcie);
+free_resources:
+ tegra_pcie_free_resources(pcie);
+disable_controller:
+ tegra_pcie_disable_controller(pcie);
put_resources:
tegra_pcie_put_resources(pcie);
return err;
tegra_pcie_probe() can fail in multiple instances, this patch takes care of freeing the resources which are allocated before probe fail. Signed-off-by: Manikanta Maddireddy <mmaddireddy@nvidia.com> --- V2: * no change in this patch V3: * change 'if check' to 'legacy_phy is true' for tegra_pcie_phys_put_legacy() * commit log correction V4: * no change in this patch V5: * Decoupled from https://patchwork.ozlabs.org/patch/832053/ and rebased on linux-next V6: * no change in this patch drivers/pci/host/pci-tegra.c | 99 +++++++++++++++++++++++++++++++++++--------- 1 file changed, 79 insertions(+), 20 deletions(-)