On Thu, Jun 06, 2024 at 12:56:35PM +0530, Manivannan Sadhasivam wrote: > As like the 'epc_init' event, that is used to signal the EPF drivers about > the EPC initialization, let's introduce 'epc_deinit' event that is used to > signal EPC deinitialization. > > The EPC deinitialization applies only when any sort of fundamental reset > is supported by the endpoint controller as per the PCIe spec. > > Reference: PCIe Base spec v5.0, sections 4.2.4.9.1 and 6.6.1. PCIe r6.0, sec 4.2.5.9.1 and 6.6.1. (Not 4.2.4.9.1, which no longer exists in r6.x) > Currently, some EPC drivers like pcie-qcom-ep and pcie-tegra194 support > PERST# as the fundamental reset. So the 'deinit' event will be notified to > the EPF drivers when PERST# assert happens in the above mentioned EPC > drivers. > > The EPF drivers, on receiving the event through the epc_deinit() callback > should reset the EPF state machine and also cleanup any configuration that > got affected by the fundamental reset like BAR, DMA etc... > > This change also warrants skipping the cleanups in unbind() if already done > in epc_deinit(). > > Reviewed-by: Niklas Cassel <cassel@xxxxxxxxxx> > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
