> From: Frank Li <frank.li@xxxxxxx> > Subject: [PATCH v5 2/4] PCI: layerscape: Add suspend/resume for ls1021a > > Add suspend/resume support for Layerscape LS1021a. > > In the suspend path, PME_Turn_Off message is sent to the endpoint to > transition the link to L2/L3_Ready state. In this SoC, there is no way to check if > the controller has received the PME_To_Ack from the endpoint or not. So to be > on the safer side, the driver just waits for PCIE_PME_TO_L2_TIMEOUT_US > before asserting the SoC specific PMXMTTURNOFF bit to complete the > PME_Turn_Off handshake. Then the link would enter L2/L3 state depending on > the VAUX supply. > > In the resume path, the link is brought back from L2 to L0 by doing a software > reset. > > Signed-off-by: Frank Li <Frank.Li@xxxxxxx> Acked-by: Roy Zang <Roy.Zang@xxxxxxx> Roy
