When the root complex suspends it must send a PME_Turn_Off TLP. Implement this by asserting the "turnoff" reset. On imx7d this is 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. --- Previously posted here: https://patchwork.kernel.org/cover/10565871/ Parts of that were already merged and available in linux-next so reposting as a focused series. This is not very complex but needs to be split because it touches multiple trees. Merging out of order should be fine. Some patches already carry acks for DT but somebody needs to ack the pci/reset parts. 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 .../devicetree/bindings/pci/fsl,imx6q-pcie.txt | 1 + arch/arm/boot/dts/imx7d.dtsi | 5 +++-- drivers/pci/controller/dwc/pci-imx6.c | 15 +++++++++++++++ drivers/reset/reset-imx7.c | 1 + include/dt-bindings/reset/imx7-reset.h | 4 +++- 5 files changed, 23 insertions(+), 3 deletions(-) -- 2.17.1
