diff mbox series

[v10,01/12] PCI: dwc: Fix writing wrong value if snps,enable-cdm-check

Message ID 20230308082352.491561-2-yoshihiro.shimoda.uh@renesas.com
State New
Headers show
Series PCI: rcar-gen4: Add R-Car Gen4 PCIe support | expand

Commit Message

Yoshihiro Shimoda March 8, 2023, 8:23 a.m. UTC 
The "val" of PCIE_PORT_LINK_CONTROL will be reused on the
"Set the number of lanes". But, if snps,enable-cdm-check" exists,
the "val" will be set to PCIE_PL_CHK_REG_CONTROL_STATUS.
Therefore, unexpected register value is possible to be used
to PCIE_PORT_LINK_CONTROL register if snps,enable-cdm-check" exists.
So, change reading timing of PCIE_PORT_LINK_CONTROL register to fix
the issue.

Fixes: ec7b952f453c ("PCI: dwc: Always enable CDM check if "snps,enable-cdm-check" exists")
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
---
 drivers/pci/controller/dwc/pcie-designware.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)
diff mbox series

Patch

diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
index 53a16b8b6ac2..8e33e6e59e68 100644
--- a/drivers/pci/controller/dwc/pcie-designware.c
+++ b/drivers/pci/controller/dwc/pcie-designware.c
@@ -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;