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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>
This commit is contained in:
Serge Semin 2022-06-24 17:34:19 +03:00 committed by Bjorn Helgaas
parent 6717331843
commit bbc7c4de33
1 changed files with 5 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/pci/controller/dwc/pcie-designware.c
View File

@ -600,15 +600,15 @@ static void dw_pcie_link_set_max_speed(struct dw_pcie *pci, u32 link_gen)
}
static u8 dw_pcie_iatu_unroll_enabled(struct dw_pcie *pci)
static bool dw_pcie_iatu_unroll_enabled(struct dw_pcie *pci)
{
u32 val;
val = dw_pcie_readl_dbi(pci, PCIE_ATU_VIEWPORT);
if (val == 0xffffffff)
return 1;
return true;
return 0;
return false;
}
static void dw_pcie_iatu_detect_regions_unroll(struct dw_pcie *pci)
@ -680,9 +680,8 @@ void dw_pcie_iatu_detect(struct dw_pcie *pci)
struct device *dev = pci->dev;
struct platform_device *pdev = to_platform_device(dev);
if (pci->version >= 0x480A || (!pci->version &&
dw_pcie_iatu_unroll_enabled(pci))) {
pci->iatu_unroll_enabled = true;
pci->iatu_unroll_enabled = dw_pcie_iatu_unroll_enabled(pci);
if (pci->iatu_unroll_enabled) {
if (!pci->atu_base) {
struct resource *res =
platform_get_resource_byname(pdev, IORESOURCE_MEM, "atu");