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PCI: dwc: Fix PORT_LINK_CONTROL update when CDM check enabled

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If CDM_CHECK is enabled (by the DT "snps,enable-cdm-check" property), 'val'
is overwritten by PCIE_PL_CHK_REG_CONTROL_STATUS initialization.  Commit
ec7b952f45 ("PCI: dwc: Always enable CDM check if "snps,enable-cdm-check"
exists") did not account for further usage of 'val', so we wrote improper
values to PCIE_PORT_LINK_CONTROL when the CDM check is enabled.

Move the PCIE_PORT_LINK_CONTROL update to be completely after the
PCIE_PL_CHK_REG_CONTROL_STATUS register initialization.

[bhelgaas: commit log adapted from Serge's version]
Fixes: ec7b952f45 ("PCI: dwc: Always enable CDM check if "snps,enable-cdm-check" exists")
Link: https://lore.kernel.org/r/20230310123510.675685-2-yoshihiro.shimoda.uh@renesas.com
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Serge Semin <fancer.lancer@gmail.com>
This commit is contained in:
Yoshihiro Shimoda 2023-03-10 21:34:58 +09:00 committed by Bjorn Helgaas
parent fe15c26ee2
commit cdce670991
1 changed files with 5 additions and 5 deletions
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10
drivers/pci/controller/dwc/pcie-designware.c
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@ -1001,11 +1001,6 @@ void dw_pcie_setup(struct dw_pcie *pci)
dw_pcie_writel_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL, val);
}
val = dw_pcie_readl_dbi(pci, PCIE_PORT_LINK_CONTROL);
val &= ~PORT_LINK_FAST_LINK_MODE;
val |= PORT_LINK_DLL_LINK_EN;
dw_pcie_writel_dbi(pci, PCIE_PORT_LINK_CONTROL, val);
if (dw_pcie_cap_is(pci, CDM_CHECK)) {
val = dw_pcie_readl_dbi(pci, PCIE_PL_CHK_REG_CONTROL_STATUS);
val |= PCIE_PL_CHK_REG_CHK_REG_CONTINUOUS |
@ -1013,6 +1008,11 @@ void dw_pcie_setup(struct dw_pcie *pci)
dw_pcie_writel_dbi(pci, PCIE_PL_CHK_REG_CONTROL_STATUS, val);
}
val = dw_pcie_readl_dbi(pci, PCIE_PORT_LINK_CONTROL);
val &= ~PORT_LINK_FAST_LINK_MODE;
val |= PORT_LINK_DLL_LINK_EN;
dw_pcie_writel_dbi(pci, PCIE_PORT_LINK_CONTROL, val);
if (!pci->num_lanes) {
dev_dbg(pci->dev, "Using h/w default number of lanes\n");
return;