Re: [PATCH v2] dmaengine: dw-edma: Remove runtime PM support

[Vinod Koul]

On 10-09-22, 11:17, Manivannan Sadhasivam wrote:
> Currently, the dw-edma driver enables the runtime_pm for parent device
> (chip->dev) and increments/decrements the refcount during alloc/free
> chan resources callbacks.
> 
> This leads to a problem when the eDMA driver has been probed, but the
> channels were not used. This scenario can happen when the DW PCIe driver
> probes eDMA driver successfully, but the PCI EPF driver decides not to
> use eDMA channels and use iATU instead for PCI transfers.
> 
> In this case, the underlying device would be runtime suspended due to
> pm_runtime_enable() in dw_edma_probe() and the PCI EPF driver would have
> no knowledge of it.
> 
> Ideally, the eDMA driver should not be the one doing the runtime PM of
> the parent device. The responsibility should instead belong to the client
> drivers like PCI EPF.
> 
> So let's remove the runtime PM support from eDMA driver.

Applied, thanks

-- 
~Vinod