From: Francesco Dolcini francesco.dolcini@toradex.com
[ Upstream commit a6809941c1f17f455db2cf4ca19c6d8c8746ec25 ]
According to the PCIe standard the PERST# signal (reset-gpio in fsl,imx* compatible dts) should be kept asserted for at least 100 usec before the PCIe refclock is stable, should be kept asserted for at least 100 msec after the power rails are stable and the host should wait at least 100 msec after it is de-asserted before accessing the configuration space of any attached device.
From PCIe CEM r2.0, sec 2.6.2
T-PVPERL: Power stable to PERST# inactive - 100 msec T-PERST-CLK: REFCLK stable before PERST# inactive - 100 usec.
From PCIe r5.0, sec 6.6.1
With a Downstream Port that does not support Link speeds greater than 5.0 GT/s, software must wait a minimum of 100 ms before sending a Configuration Request to the device immediately below that Port.
Failure to do so could prevent PCIe devices to be working correctly, and this was experienced with real devices.
Move reset assert to imx6_pcie_assert_core_reset(), this way we ensure that PERST# is asserted before enabling any clock, move de-assert to the end of imx6_pcie_deassert_core_reset() after the clock is enabled and deemed stable and add a new delay of 100 msec just afterward.
Link: https://lore.kernel.org/all/20220211152550.286821-1-francesco.dolcini@torade... Link: https://lore.kernel.org/r/20220404081509.94356-1-francesco.dolcini@toradex.c... Fixes: bb38919ec56e ("PCI: imx6: Add support for i.MX6 PCIe controller") Signed-off-by: Francesco Dolcini francesco.dolcini@toradex.com Signed-off-by: Lorenzo Pieralisi lorenzo.pieralisi@arm.com Reviewed-by: Lucas Stach l.stach@pengutronix.de Acked-by: Richard Zhu hongxing.zhu@nxp.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/pci/controller/dwc/pci-imx6.c | 23 ++++++++++++++--------- 1 file changed, 14 insertions(+), 9 deletions(-)
diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c index 343fe1429e3c..ce3a36d1f2fa 100644 --- a/drivers/pci/controller/dwc/pci-imx6.c +++ b/drivers/pci/controller/dwc/pci-imx6.c @@ -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", 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) @@ -540,15 +545,6 @@ static void imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie) /* allow the clocks to stabilize */ 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) { case IMX8MQ: reset_control_deassert(imx6_pcie->pciephy_reset); @@ -595,6 +591,15 @@ static void imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie) 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;
err_ref_clk: