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Merge branch 'remotes/lorenzo/pci/imx6'

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- Fix PERST# start-up sequence (Francesco Dolcini)

* remotes/lorenzo/pci/imx6:
  PCI: imx6: Fix PERST# start-up sequence
This commit is contained in:
Bjorn Helgaas 2022-05-24 16:42:24 -05:00
commit b8dc34460c
1 changed files with 14 additions and 9 deletions
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23
drivers/pci/controller/dwc/pci-imx6.c
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@ -408,6 +408,11 @@ static void imx6_pcie_assert_core_reset(struct imx6_pcie *imx6_pcie)
dev_err(dev, "failed to disable vpcie regulator: %d\n", dev_err(dev, "failed to disable vpcie regulator: %d\n",
ret); ret);
} }
/* Some boards don't have PCIe reset GPIO. */
if (gpio_is_valid(imx6_pcie->reset_gpio))
gpio_set_value_cansleep(imx6_pcie->reset_gpio,
imx6_pcie->gpio_active_high);
} }
static unsigned int imx6_pcie_grp_offset(const struct imx6_pcie *imx6_pcie) static unsigned int imx6_pcie_grp_offset(const struct imx6_pcie *imx6_pcie)
@ -540,15 +545,6 @@ static void imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie)
/* allow the clocks to stabilize */ /* allow the clocks to stabilize */
usleep_range(200, 500); usleep_range(200, 500);
/* Some boards don't have PCIe reset GPIO. */
if (gpio_is_valid(imx6_pcie->reset_gpio)) {
gpio_set_value_cansleep(imx6_pcie->reset_gpio,
imx6_pcie->gpio_active_high);
msleep(100);
gpio_set_value_cansleep(imx6_pcie->reset_gpio,
!imx6_pcie->gpio_active_high);
}
switch (imx6_pcie->drvdata->variant) { switch (imx6_pcie->drvdata->variant) {
case IMX8MQ: case IMX8MQ:
reset_control_deassert(imx6_pcie->pciephy_reset); reset_control_deassert(imx6_pcie->pciephy_reset);
@ -595,6 +591,15 @@ static void imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie)
break; break;
} }
/* Some boards don't have PCIe reset GPIO. */
if (gpio_is_valid(imx6_pcie->reset_gpio)) {
msleep(100);
gpio_set_value_cansleep(imx6_pcie->reset_gpio,
!imx6_pcie->gpio_active_high);
/* Wait for 100ms after PERST# deassertion (PCIe r5.0, 6.6.1) */
msleep(100);
}
return; return;
err_ref_clk: err_ref_clk: