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Subject[PATCH v4 1/4] PCI: rockchip: Fix error handlings
Date
Fix error handlings in probe & resume.

Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
---

Changes in v4:
Rebase on newest for-next branch, also fix error handling by:
1e7f570a1b86 PCI: rockchip: Idle inactive PHY(s)

Changes in v3: None
Changes in v2: None

drivers/pci/host/pcie-rockchip.c | 160 +++++++++++++++++++++------------------
1 file changed, 87 insertions(+), 73 deletions(-)

diff --git a/drivers/pci/host/pcie-rockchip.c b/drivers/pci/host/pcie-rockchip.c
index 2eccd532c256..5d85ec2e2fb0 100644
--- a/drivers/pci/host/pcie-rockchip.c
+++ b/drivers/pci/host/pcie-rockchip.c
@@ -561,32 +561,32 @@ static int rockchip_pcie_init_port(struct rockchip_pcie *rockchip)
err = phy_init(rockchip->phys[i]);
if (err) {
dev_err(dev, "init phy%d err %d\n", i, err);
- return err;
+ goto err_exit_phy;
}
}

err = reset_control_assert(rockchip->core_rst);
if (err) {
dev_err(dev, "assert core_rst err %d\n", err);
- return err;
+ goto err_exit_phy;
}

err = reset_control_assert(rockchip->mgmt_rst);
if (err) {
dev_err(dev, "assert mgmt_rst err %d\n", err);
- return err;
+ goto err_exit_phy;
}

err = reset_control_assert(rockchip->mgmt_sticky_rst);
if (err) {
dev_err(dev, "assert mgmt_sticky_rst err %d\n", err);
- return err;
+ goto err_exit_phy;
}

err = reset_control_assert(rockchip->pipe_rst);
if (err) {
dev_err(dev, "assert pipe_rst err %d\n", err);
- return err;
+ goto err_exit_phy;
}

udelay(10);
@@ -594,19 +594,19 @@ static int rockchip_pcie_init_port(struct rockchip_pcie *rockchip)
err = reset_control_deassert(rockchip->pm_rst);
if (err) {
dev_err(dev, "deassert pm_rst err %d\n", err);
- return err;
+ goto err_exit_phy;
}

err = reset_control_deassert(rockchip->aclk_rst);
if (err) {
dev_err(dev, "deassert aclk_rst err %d\n", err);
- return err;
+ goto err_exit_phy;
}

err = reset_control_deassert(rockchip->pclk_rst);
if (err) {
dev_err(dev, "deassert pclk_rst err %d\n", err);
- return err;
+ goto err_exit_phy;
}

if (rockchip->link_gen == 2)
@@ -628,7 +628,7 @@ static int rockchip_pcie_init_port(struct rockchip_pcie *rockchip)
err = phy_power_on(rockchip->phys[i]);
if (err) {
dev_err(dev, "power on phy%d err %d\n", i, err);
- return err;
+ goto err_power_off_phy;
}
}

@@ -639,25 +639,25 @@ static int rockchip_pcie_init_port(struct rockchip_pcie *rockchip)
err = reset_control_deassert(rockchip->mgmt_sticky_rst);
if (err) {
dev_err(dev, "deassert mgmt_sticky_rst err %d\n", err);
- return err;
+ goto err_power_off_phy;
}

err = reset_control_deassert(rockchip->core_rst);
if (err) {
dev_err(dev, "deassert core_rst err %d\n", err);
- return err;
+ goto err_power_off_phy;
}

err = reset_control_deassert(rockchip->mgmt_rst);
if (err) {
dev_err(dev, "deassert mgmt_rst err %d\n", err);
- return err;
+ goto err_power_off_phy;
}

err = reset_control_deassert(rockchip->pipe_rst);
if (err) {
dev_err(dev, "deassert pipe_rst err %d\n", err);
- return err;
+ goto err_power_off_phy;
}

/* Fix the transmitted FTS count desired to exit from L0s. */
@@ -690,7 +690,7 @@ static int rockchip_pcie_init_port(struct rockchip_pcie *rockchip)
500 * USEC_PER_MSEC);
if (err) {
dev_err(dev, "PCIe link training gen1 timeout!\n");
- return -ETIMEDOUT;
+ goto err_power_off_phy;
}

if (rockchip->link_gen == 2) {
@@ -751,6 +751,26 @@ static int rockchip_pcie_init_port(struct rockchip_pcie *rockchip)
rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_DCSR);

return 0;
+err_power_off_phy:
+ while (i--)
+ phy_power_off(rockchip->phys[i]);
+ i = MAX_LANE_NUM;
+err_exit_phy:
+ while (i--)
+ phy_exit(rockchip->phys[i]);
+ return err;
+}
+
+static void rockchip_pcie_deinit_phys(struct rockchip_pcie *rockchip)
+{
+ int i;
+
+ for (i = 0; i < MAX_LANE_NUM; i++) {
+ /* inactive lane is already powered off */
+ if (rockchip->legacy_phy || rockchip->lanes_map & BIT(i))
+ phy_power_off(rockchip->phys[i]);
+ phy_exit(rockchip->phys[i]);
+ }
}

static irqreturn_t rockchip_pcie_subsys_irq_handler(int irq, void *arg)
@@ -1131,7 +1151,7 @@ static int rockchip_pcie_set_vpcie(struct rockchip_pcie *rockchip)
err = regulator_enable(rockchip->vpcie12v);
if (err) {
dev_err(dev, "fail to enable vpcie12v regulator\n");
- goto err_out;
+ return err;
}
}

@@ -1160,7 +1180,6 @@ static int rockchip_pcie_set_vpcie(struct rockchip_pcie *rockchip)
}

return 0;
-
err_disable_1v8:
if (!IS_ERR(rockchip->vpcie1v8))
regulator_disable(rockchip->vpcie1v8);
@@ -1170,7 +1189,6 @@ static int rockchip_pcie_set_vpcie(struct rockchip_pcie *rockchip)
err_disable_12v:
if (!IS_ERR(rockchip->vpcie12v))
regulator_disable(rockchip->vpcie12v);
-err_out:
return err;
}

@@ -1364,7 +1382,7 @@ static int rockchip_pcie_wait_l2(struct rockchip_pcie *rockchip)
static int __maybe_unused rockchip_pcie_suspend_noirq(struct device *dev)
{
struct rockchip_pcie *rockchip = dev_get_drvdata(dev);
- int ret, i;
+ int ret;

/* disable core and cli int since we don't need to ack PME_ACK */
rockchip_pcie_write(rockchip, (PCIE_CLIENT_INT_CLI << 16) |
@@ -1377,12 +1395,7 @@ static int __maybe_unused rockchip_pcie_suspend_noirq(struct device *dev)
return ret;
}

- for (i = 0; i < MAX_LANE_NUM; i++) {
- /* inactive lane is already powered off */
- if (rockchip->lanes_map & BIT(i))
- phy_power_off(rockchip->phys[i]);
- phy_exit(rockchip->phys[i]);
- }
+ rockchip_pcie_deinit_phys(rockchip);

clk_disable_unprepare(rockchip->clk_pcie_pm);
clk_disable_unprepare(rockchip->hclk_pcie);
@@ -1391,7 +1404,6 @@ static int __maybe_unused rockchip_pcie_suspend_noirq(struct device *dev)

if (!IS_ERR(rockchip->vpcie0v9))
regulator_disable(rockchip->vpcie0v9);
-
return ret;
}

@@ -1410,43 +1422,46 @@ static int __maybe_unused rockchip_pcie_resume_noirq(struct device *dev)

err = clk_prepare_enable(rockchip->clk_pcie_pm);
if (err)
- goto err_pcie_pm;
+ goto err_disable_0v9;

err = clk_prepare_enable(rockchip->hclk_pcie);
if (err)
- goto err_hclk_pcie;
+ goto err_disable_clk_pcie_pm;

err = clk_prepare_enable(rockchip->aclk_perf_pcie);
if (err)
- goto err_aclk_perf_pcie;
+ goto err_disable_hclk_pcie;

err = clk_prepare_enable(rockchip->aclk_pcie);
if (err)
- goto err_aclk_pcie;
+ goto err_disable_aclk_perf_pcie;

err = rockchip_pcie_init_port(rockchip);
if (err)
- goto err_pcie_resume;
+ goto err_disable_aclk_pcie;

err = rockchip_pcie_cfg_atu(rockchip);
if (err)
- goto err_pcie_resume;
+ goto err_deinit_port;

/* Need this to enter L1 again */
rockchip_pcie_update_txcredit_mui(rockchip);
rockchip_pcie_enable_interrupts(rockchip);

return 0;
-
-err_pcie_resume:
+err_deinit_port:
+ rockchip_pcie_deinit_phys(rockchip);
+err_disable_aclk_pcie:
clk_disable_unprepare(rockchip->aclk_pcie);
-err_aclk_pcie:
+err_disable_aclk_perf_pcie:
clk_disable_unprepare(rockchip->aclk_perf_pcie);
-err_aclk_perf_pcie:
+err_disable_hclk_pcie:
clk_disable_unprepare(rockchip->hclk_pcie);
-err_hclk_pcie:
+err_disable_clk_pcie_pm:
clk_disable_unprepare(rockchip->clk_pcie_pm);
-err_pcie_pm:
+err_disable_0v9:
+ if (!IS_ERR(rockchip->vpcie0v9))
+ regulator_disable(rockchip->vpcie0v9);
return err;
}

@@ -1483,47 +1498,47 @@ static int rockchip_pcie_probe(struct platform_device *pdev)
err = clk_prepare_enable(rockchip->aclk_pcie);
if (err) {
dev_err(dev, "unable to enable aclk_pcie clock\n");
- goto err_aclk_pcie;
+ return err;
}

err = clk_prepare_enable(rockchip->aclk_perf_pcie);
if (err) {
dev_err(dev, "unable to enable aclk_perf_pcie clock\n");
- goto err_aclk_perf_pcie;
+ goto err_disable_aclk_pcie;
}

err = clk_prepare_enable(rockchip->hclk_pcie);
if (err) {
dev_err(dev, "unable to enable hclk_pcie clock\n");
- goto err_hclk_pcie;
+ goto err_disable_aclk_perf_pcie;
}

err = clk_prepare_enable(rockchip->clk_pcie_pm);
if (err) {
dev_err(dev, "unable to enable hclk_pcie clock\n");
- goto err_pcie_pm;
+ goto err_disable_hclk_pcie;
}

err = rockchip_pcie_set_vpcie(rockchip);
if (err) {
dev_err(dev, "failed to set vpcie regulator\n");
- goto err_set_vpcie;
+ goto err_disable_clk_pcie_pm;
}

err = rockchip_pcie_init_port(rockchip);
if (err)
- goto err_vpcie;
+ goto err_disable_vpcie;

rockchip_pcie_enable_interrupts(rockchip);

err = rockchip_pcie_init_irq_domain(rockchip);
if (err < 0)
- goto err_vpcie;
+ goto err_deinit_port;

err = of_pci_get_host_bridge_resources(dev->of_node, 0, 0xff,
&res, &io_base);
if (err)
- goto err_vpcie;
+ goto err_remove_irq_domain;

err = devm_request_pci_bus_resources(dev, &res);
if (err)
@@ -1561,12 +1576,12 @@ static int rockchip_pcie_probe(struct platform_device *pdev)

err = rockchip_pcie_cfg_atu(rockchip);
if (err)
- goto err_free_res;
+ goto err_unmap_iospace;

rockchip->msg_region = devm_ioremap(dev, rockchip->msg_bus_addr, SZ_1M);
if (!rockchip->msg_region) {
err = -ENOMEM;
- goto err_free_res;
+ goto err_unmap_iospace;
}

list_splice_init(&res, &bridge->windows);
@@ -1591,28 +1606,33 @@ static int rockchip_pcie_probe(struct platform_device *pdev)
pcie_bus_configure_settings(child);

pci_bus_add_devices(bus);
- return 0;

+ return 0;
+err_unmap_iospace:
+ pci_unmap_iospace(rockchip->io);
err_free_res:
pci_free_resource_list(&res);
-err_vpcie:
- if (!IS_ERR(rockchip->vpcie12v))
- regulator_disable(rockchip->vpcie12v);
- if (!IS_ERR(rockchip->vpcie3v3))
- regulator_disable(rockchip->vpcie3v3);
- if (!IS_ERR(rockchip->vpcie1v8))
- regulator_disable(rockchip->vpcie1v8);
+err_remove_irq_domain:
+ irq_domain_remove(rockchip->irq_domain);
+err_deinit_port:
+ rockchip_pcie_deinit_phys(rockchip);
+err_disable_vpcie:
if (!IS_ERR(rockchip->vpcie0v9))
regulator_disable(rockchip->vpcie0v9);
-err_set_vpcie:
+ if (!IS_ERR(rockchip->vpcie1v8))
+ regulator_disable(rockchip->vpcie1v8);
+ if (!IS_ERR(rockchip->vpcie3v3))
+ regulator_disable(rockchip->vpcie3v3);
+ if (!IS_ERR(rockchip->vpcie12v))
+ regulator_disable(rockchip->vpcie12v);
+err_disable_clk_pcie_pm:
clk_disable_unprepare(rockchip->clk_pcie_pm);
-err_pcie_pm:
+err_disable_hclk_pcie:
clk_disable_unprepare(rockchip->hclk_pcie);
-err_hclk_pcie:
+err_disable_aclk_perf_pcie:
clk_disable_unprepare(rockchip->aclk_perf_pcie);
-err_aclk_perf_pcie:
+err_disable_aclk_pcie:
clk_disable_unprepare(rockchip->aclk_pcie);
-err_aclk_pcie:
return err;
}

@@ -1620,33 +1640,27 @@ static int rockchip_pcie_remove(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct rockchip_pcie *rockchip = dev_get_drvdata(dev);
- int i;

pci_stop_root_bus(rockchip->root_bus);
pci_remove_root_bus(rockchip->root_bus);
pci_unmap_iospace(rockchip->io);
irq_domain_remove(rockchip->irq_domain);

- for (i = 0; i < MAX_LANE_NUM; i++) {
- /* inactive lane is already powered off */
- if (rockchip->lanes_map & BIT(i))
- phy_power_off(rockchip->phys[i]);
- phy_exit(rockchip->phys[i]);
- }
+ rockchip_pcie_deinit_phys(rockchip);

clk_disable_unprepare(rockchip->clk_pcie_pm);
clk_disable_unprepare(rockchip->hclk_pcie);
clk_disable_unprepare(rockchip->aclk_perf_pcie);
clk_disable_unprepare(rockchip->aclk_pcie);

- if (!IS_ERR(rockchip->vpcie12v))
- regulator_disable(rockchip->vpcie12v);
- if (!IS_ERR(rockchip->vpcie3v3))
- regulator_disable(rockchip->vpcie3v3);
- if (!IS_ERR(rockchip->vpcie1v8))
- regulator_disable(rockchip->vpcie1v8);
if (!IS_ERR(rockchip->vpcie0v9))
regulator_disable(rockchip->vpcie0v9);
+ if (!IS_ERR(rockchip->vpcie1v8))
+ regulator_disable(rockchip->vpcie1v8);
+ if (!IS_ERR(rockchip->vpcie3v3))
+ regulator_disable(rockchip->vpcie3v3);
+ if (!IS_ERR(rockchip->vpcie12v))
+ regulator_disable(rockchip->vpcie12v);

return 0;
}
--
2.11.0

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