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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 1/9/2020 11:36 AM, Shawn Guo wrote: > External email: Use caution opening links or attachments > > > Some platform has 4 (or more) viewports. In that case, CFG0 and CFG1 > can be separated into different ATU regions. Is there any specific benefit with this scheme? - Vidya Sagar > > Signed-off-by: Shawn Guo > --- > .../pci/controller/dwc/pcie-designware-host.c | 16 +++++++++++++++- > drivers/pci/controller/dwc/pcie-designware.h | 1 + > 2 files changed, 16 insertions(+), 1 deletion(-) > > diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c > index 0f36a926059a..504d2a192bba 100644 > --- a/drivers/pci/controller/dwc/pcie-designware-host.c > +++ b/drivers/pci/controller/dwc/pcie-designware-host.c > @@ -532,6 +532,7 @@ static int dw_pcie_access_other_conf(struct pcie_port *pp, struct pci_bus *bus, > u64 cpu_addr; > void __iomem *va_cfg_base; > struct dw_pcie *pci = to_dw_pcie_from_pp(pp); > + int index = PCIE_ATU_REGION_INDEX1; > > busdev = PCIE_ATU_BUS(bus->number) | PCIE_ATU_DEV(PCI_SLOT(devfn)) | > PCIE_ATU_FUNC(PCI_FUNC(devfn)); > @@ -548,7 +549,20 @@ static int dw_pcie_access_other_conf(struct pcie_port *pp, struct pci_bus *bus, > va_cfg_base = pp->va_cfg1_base; > } > > - dw_pcie_prog_outbound_atu(pci, PCIE_ATU_REGION_INDEX1, > + if (pci->num_viewport >= 4) { > + /* > + * If there are 4 (or more) viewports, we can separate > + * CFG0 and CFG1 into different ATU regions: > + * - region0: MEM > + * - region1: CFG0 > + * - region2: IO > + * - region3: CFG1 > + */ > + if (type == PCIE_ATU_TYPE_CFG1) > + index = PCIE_ATU_REGION_INDEX3; > + } > + > + dw_pcie_prog_outbound_atu(pci, index, > type, cpu_addr, > busdev, cfg_size); > if (write) > diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h > index 5a18e94e52c8..86225804f1e7 100644 > --- a/drivers/pci/controller/dwc/pcie-designware.h > +++ b/drivers/pci/controller/dwc/pcie-designware.h > @@ -63,6 +63,7 @@ > #define PCIE_ATU_VIEWPORT 0x900 > #define PCIE_ATU_REGION_INBOUND BIT(31) > #define PCIE_ATU_REGION_OUTBOUND 0 > +#define PCIE_ATU_REGION_INDEX3 0x3 > #define PCIE_ATU_REGION_INDEX2 0x2 > #define PCIE_ATU_REGION_INDEX1 0x1 > #define PCIE_ATU_REGION_INDEX0 0x0 > -- > 2.17.1 > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel