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PCI: imx6: Add 'skip_pwrctrl_off' flag support

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Use 'dw_pcie_rp->skip_pwrctrl_off' to avoid powering off devices during
suspend to preserve wakeup capability of the devices and also not to
power on the devices in the init path.

This allows controller power-off to be skipped when some devices (e.g.
M.2 Key E cards without auxiliary power) need to support PCIe L2 link
state and wake-up mechanisms.

Signed-off-by: Sherry Sun <sherry.sun@nxp.com>
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260713023435.235765-3-sherry.sun@oss.nxp.com
This commit is contained in:
Sherry Sun 2026-07-13 10:34:33 +08:00 committed by Manivannan Sadhasivam
parent 2c5768344f
commit f26b1c697a
1 changed files with 10 additions and 6 deletions
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16
drivers/pci/controller/dwc/pci-imx6.c
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@ -1382,10 +1382,12 @@ static int imx_pcie_host_init(struct dw_pcie_rp *pp)
}
}
ret = pci_pwrctrl_power_on_devices(dev);
if (ret) {
dev_err(dev, "failed to power on pwrctrl devices\n");
goto err_reg_disable;
if (!pp->skip_pwrctrl_off) {
ret = pci_pwrctrl_power_on_devices(dev);
if (ret) {
dev_err(dev, "failed to power on pwrctrl devices\n");
goto err_reg_disable;
}
}
ret = imx_pcie_clk_enable(imx_pcie);
@ -1454,7 +1456,8 @@ static int imx_pcie_host_init(struct dw_pcie_rp *pp)
err_clk_disable:
imx_pcie_clk_disable(imx_pcie);
err_pwrctrl_power_off:
pci_pwrctrl_power_off_devices(dev);
if (!pp->skip_pwrctrl_off)
pci_pwrctrl_power_off_devices(dev);
err_reg_disable:
if (imx_pcie->vpcie)
regulator_disable(imx_pcie->vpcie);
@ -1473,7 +1476,8 @@ static void imx_pcie_host_exit(struct dw_pcie_rp *pp)
}
imx_pcie_clk_disable(imx_pcie);
pci_pwrctrl_power_off_devices(pci->dev);
if (!pci->pp.skip_pwrctrl_off)
pci_pwrctrl_power_off_devices(pci->dev);
if (imx_pcie->vpcie)
regulator_disable(imx_pcie->vpcie);
}