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PCI: rockchip: Clean up PHY if driver probe or resume fails 

We observed that the clk_pciephy_ref is still enabled when we fail to probe
the driver.

  root@linaro-alip:~# grep pcie /sys/kernel/debug/clk/clk_summary
  clk_pciephy_ref                    1     1        24000000       0 0
  clk_pcie_pm                        0     0        24000000       0 0
	  clk_pcie_core_cru          0     0       125000000       0 0
	  clk_pciephy_ref100m        0     0       100000000       0 0
		  aclk_pcie          0     0       148500000       0 0
		  aclk_perf_pcie     0     0       148500000       0 0
			  pclk_pcie  0     0        37125000       0 0
  clk_pcie_core                      0     0               0       0 0

clk_pciephy_ref is used by the PHY driver and we need to properly disable
it for this case.  Add error handling in rockchip_pcie_init_port() and
rockchip_pcie_resume_noirq() to fix this issue.

Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Shawn Lin 2017-08-23 15:03:07 +08:00 committed by Bjorn Helgaas
parent de8473f514
commit 8c595dd1fd
1 changed files with 29 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

46
drivers/pci/host/pcie-rockchip.c
View File

@ -567,32 +567,32 @@ 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);
@ -600,19 +600,19 @@ 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)
@ -634,7 +634,7 @@ 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;
}
}
@ -645,25 +645,25 @@ 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. */
@ -696,7 +696,7 @@ 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) {
@ -754,6 +754,14 @@ 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)
@ -1488,7 +1496,7 @@ static int __maybe_unused rockchip_pcie_resume_noirq(struct device *dev)
err = rockchip_pcie_cfg_atu(rockchip);
if (err)
goto err_pcie_resume;
goto err_err_deinit_port;
/* Need this to enter L1 again */
rockchip_pcie_update_txcredit_mui(rockchip);
@ -1496,6 +1504,8 @@ static int __maybe_unused rockchip_pcie_resume_noirq(struct device *dev)
return 0;
err_err_deinit_port:
rockchip_pcie_deinit_phys(rockchip);
err_pcie_resume:
rockchip_pcie_disable_clocks(rockchip);
return err;
@ -1549,12 +1559,12 @@ static int rockchip_pcie_probe(struct platform_device *pdev)
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_deinit_port;
err = devm_request_pci_bus_resources(dev, &res);
if (err)
@ -1626,6 +1636,8 @@ static int rockchip_pcie_probe(struct platform_device *pdev)
err_free_res:
pci_free_resource_list(&res);
err_deinit_port:
rockchip_pcie_deinit_phys(rockchip);
err_vpcie:
if (!IS_ERR(rockchip->vpcie12v))
regulator_disable(rockchip->vpcie12v);