On Tue, Jun 2, 2020 at 11:9:38, Vidya Sagar <[email protected]> wrote:
> In this patch series, > Patch-1 > adds required infrastructure to deal with prefetchable memory region > information coming from 'ranges' property of the respective device-tree node > separately from non-prefetchable memory region information. > Patch-2 > Adds support to use ATU region-3 for establishing the mapping between CPU > addresses and PCIe bus addresses. > It also changes the logic to determine whether mapping is required or not by > checking both CPU address and PCIe bus address for both prefetchable and > non-prefetchable regions. If the addresses are same, then, it is understood > that 1:1 mapping is in place and there is no need to setup ATU mapping > whereas if the addresses are not the same, then, there is a need to setup ATU > mapping. This is certainly true for Tegra194 and what I heard from our HW > engineers is that it should generally be true for any DWC based implementation > also. > Hence, I request Synopsys folks (Jingoo Han & Gustavo Pimentel ??) to confirm > the same so that this particular patch won't cause any regressions for other > DWC based platforms. Hi Vidya, Unfortunately due to the COVID-19 lockdown, I can't access my development prototype setup to test your patch. It might take some while until I get the possibility to get access to it again. -Gustavo > > Vidya Sagar (2): > PCI: dwc: Add support to handle prefetchable memory separately > PCI: dwc: Use ATU region to map prefetchable memory region > > .../pci/controller/dwc/pcie-designware-host.c | 46 ++++++++++++++----- > drivers/pci/controller/dwc/pcie-designware.c | 6 ++- > drivers/pci/controller/dwc/pcie-designware.h | 8 +++- > 3 files changed, 45 insertions(+), 15 deletions(-) > > -- > 2.17.1
