diff options
| author | Serge Semin <Sergey.Semin@baikalelectronics.ru> | 2022-06-24 17:34:19 +0300 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2022-07-05 19:00:52 -0500 |
| commit | bbc7c4de33e4cf2904f4bf562631b513a4df40bb (patch) | |
| tree | b9ded71ff92c29d10f488b3a18b8e28cddf3cdcd /drivers/pci/controller/pci-host-generic.c | |
| parent | 671733184364012461c18643da8188c992b040ea (diff) | |
PCI: dwc: Simplify unrolled iATU detection
The unrolled version of the internal ATU has been available since the DWC
PCIe v4.80a IP core, but it may not be enabled. Per [1], if unrolled ATU
is enabled, the PCIE_ATU_VIEWPORT does not exist and reads as 0xffffffff;
while if unrolled ATU is disabled, PCIE_ATU_VIEWPORT will contain some
zeros.
Simplify dw_pcie_iatu_unroll_enabled() by checking the value of
PCIE_ATU_VIEWPORT.
[1] DesignWare Cores, PCI Express Controller, Register Desciptions,
v.4.90a, December 2016, p.855
[bhelgaas: commit log]
Link: https://lore.kernel.org/r/20220624143428.8334-10-Sergey.Semin@baikalelectronics.ru
Tested-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Diffstat (limited to 'drivers/pci/controller/pci-host-generic.c')
0 files changed, 0 insertions, 0 deletions