[PATCH v2 2/3] PCI: qcom: Read back PARF_LTSSM register

[Konrad Dybcio]

To ensure write completion, read the PARF_LTSSM register after setting
the LTSSM enable bit before polling for "link up".

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
Signed-off-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxx>
---
 drivers/pci/controller/dwc/pcie-qcom.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index cbde9effa352..6a469ed213ce 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -539,6 +539,7 @@ static void qcom_pcie_2_3_2_ltssm_enable(struct qcom_pcie *pcie)
 	val = readl(pcie->parf + PARF_LTSSM);
 	val |= LTSSM_EN;
 	writel(val, pcie->parf + PARF_LTSSM);
+	readl(pcie->parf + PARF_LTSSM);
 }
 
 static int qcom_pcie_get_resources_2_3_2(struct qcom_pcie *pcie)

-- 
2.40.1