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PCI: imx6: Reduce resume time by only starting link if it was up before suspend 

i.MX PCIe doesn't support hotplug. During resume, only start PCIe link
training when the link was up before system suspend to avoid the long
latency in the link training period.

Link: https://lore.kernel.org/r/1657783869-19194-14-git-send-email-hongxing.zhu@nxp.com
Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Richard Zhu 2022-07-14 15:31:05 +08:00 committed by Bjorn Helgaas
parent 508919d0a9
commit af48f8226e
1 changed files with 6 additions and 1 deletions
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7
drivers/pci/controller/dwc/pci-imx6.c
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@ -67,6 +67,7 @@ struct imx6_pcie {
struct dw_pcie *pci;
int reset_gpio;
bool gpio_active_high;
bool link_is_up;
struct clk *pcie_bus;
struct clk *pcie_phy;
struct clk *pcie_inbound_axi;
@ -881,11 +882,13 @@ static int imx6_pcie_start_link(struct dw_pcie *pci)
dev_info(dev, "Link: Gen2 disabled\n");
}
imx6_pcie->link_is_up = true;
tmp = dw_pcie_readw_dbi(pci, offset + PCI_EXP_LNKSTA);
dev_info(dev, "Link up, Gen%i\n", tmp & PCI_EXP_LNKSTA_CLS);
return 0;
err_reset_phy:
imx6_pcie->link_is_up = false;
dev_dbg(dev, "PHY DEBUG_R0=0x%08x DEBUG_R1=0x%08x\n",
dw_pcie_readl_dbi(pci, PCIE_PORT_DEBUG0),
dw_pcie_readl_dbi(pci, PCIE_PORT_DEBUG1));
@ -1031,7 +1034,9 @@ static int imx6_pcie_resume_noirq(struct device *dev)
return ret;
dw_pcie_setup_rc(pp);
imx6_pcie_start_link(imx6_pcie->pci);
if (imx6_pcie->link_is_up)
imx6_pcie_start_link(imx6_pcie->pci);
return 0;
}