[PATCH v4 06/18] PCI: dwc: Enable CDM-check independently from the num_lanes value

Serge Semin
2022-06-10T08:29:34Z

Currently the embedded CDM IOs consistency check-engine is enabled only if
the num_lanes field of dw_pcie structure is set to non-zero value. It's
definitely wrong since the CDM checking has nothing to do with the PCIe
lanes settings, while that feature will be left disabled for the platforms
which expect it being enabled and prefer keeping the default lanes setup.
Let's fix that by enabling the CDM-check feature before the num_lanes
parameter is handled.

Fixes: 07f123def73e ("PCI: dwc: Add support to enable CDM register check")
Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>

---

Changelog v4:
- This is a new patch created on v4 lap of the series.
---
drivers/pci/controller/dwc/pcie-designware.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
index 347251bf87d0..5848cc520b52 100644
--- a/drivers/pci/controller/dwc/pcie-designware.c
+++ b/drivers/pci/controller/dwc/pcie-designware.c
@@ -740,6 +740,13 @@ void dw_pcie_setup(struct dw_pcie *pci)
val |= PORT_LINK_DLL_LINK_EN;
dw_pcie_writel_dbi(pci, PCIE_PORT_LINK_CONTROL, val);

+ if (of_property_read_bool(np, "snps,enable-cdm-check")) {
+ val = dw_pcie_readl_dbi(pci, PCIE_PL_CHK_REG_CONTROL_STATUS);
+ val |= PCIE_PL_CHK_REG_CHK_REG_CONTINUOUS |
+ PCIE_PL_CHK_REG_CHK_REG_START;
+ dw_pcie_writel_dbi(pci, PCIE_PL_CHK_REG_CONTROL_STATUS, val);
+ }
+
of_property_read_u32(np, "num-lanes", &pci->num_lanes);
if (!pci->num_lanes) {
dev_dbg(pci->dev, "Using h/w default number of lanes\n");
@@ -786,11 +793,4 @@ void dw_pcie_setup(struct dw_pcie *pci)
break;
}
dw_pcie_writel_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL, val);
-
- if (of_property_read_bool(np, "snps,enable-cdm-check")) {
- val = dw_pcie_readl_dbi(pci, PCIE_PL_CHK_REG_CONTROL_STATUS);
- val |= PCIE_PL_CHK_REG_CHK_REG_CONTINUOUS |
- PCIE_PL_CHK_REG_CHK_REG_START;
- dw_pcie_writel_dbi(pci, PCIE_PL_CHK_REG_CONTROL_STATUS, val);
- }
}
--
2.35.1