When the root complex suspends it must send a PME_Turn_Off TLP. Implement this by asserting the "turnoff" reset. On imx7d this functionality is part of the SRC and exposed through the linux reset-controller subsystem. On imx6 equivalent bits are in the IOMUXC GPR area which the imx6-pcie driver accesses directly. This is only for imx7d right now but it's deliberately implemented as an optional reset, ignoring the chip variant: * Older dtbs won't have this reset so it will be ignored. * Future chips might also expose this as a reset controller. For example imx8m (not yet supported) has the exact same PCIE_CTRL_APPS_TURNOFF bit in the same location. --- Changes since v1: * Add 1-10ms sleep after PME_Turn_Off, with explanation * Slight fix in commit msg (this is functionality is) * Link: https://lore.kernel.org/patchwork/cover/994076/ Leonard Crestez (4): reset: imx7: Add PCIE_CTRL_APPS_TURNOFF dt-bindings: imx6q-pcie: Add turnoff reset for imx7d ARM: dts: imx7d: Add turnoff reset PCI: imx: Add PME_Turn_Off support .../bindings/pci/fsl,imx6q-pcie.txt | 1 + arch/arm/boot/dts/imx7d.dtsi | 5 ++-- drivers/pci/controller/dwc/pci-imx6.c | 24 +++++++++++++++++++ drivers/reset/reset-imx7.c | 1 + include/dt-bindings/reset/imx7-reset.h | 4 +++- 5 files changed, 32 insertions(+), 3 deletions(-) -- 2.17.1
