Return error from the function if the icc path is specified in the
dt and icc_set_bw failed or link is not up.

Signed-off-by: Krishna chaitanya chundru <quic_krichai@quicinc.com>
---
 drivers/pci/controller/dwc/pcie-qcom.c | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index e2f2940..ca6350b 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -1357,22 +1357,21 @@ static int qcom_pcie_icc_init(struct qcom_pcie *pcie)
 	return 0;
 }
 
-static void qcom_pcie_icc_update(struct qcom_pcie *pcie)
+static int qcom_pcie_icc_update(struct qcom_pcie *pcie)
 {
 	struct dw_pcie *pci = pcie->pci;
 	u32 offset, status, bw;
 	int speed, width;
-	int ret;
 
 	if (!pcie->icc_mem)
-		return;
+		return 0;
 
 	offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
 	status = readw(pci->dbi_base + offset + PCI_EXP_LNKSTA);
 
 	/* Only update constraints if link is up. */
 	if (!(status & PCI_EXP_LNKSTA_DLLLA))
-		return;
+		return -ENODEV;
 
 	speed = FIELD_GET(PCI_EXP_LNKSTA_CLS, status);
 	width = FIELD_GET(PCI_EXP_LNKSTA_NLW, status);
@@ -1392,11 +1391,7 @@ static void qcom_pcie_icc_update(struct qcom_pcie *pcie)
 		break;
 	}
 
-	ret = icc_set_bw(pcie->icc_mem, 0, width * bw);
-	if (ret) {
-		dev_err(pci->dev, "failed to set interconnect bandwidth: %d\n",
-			ret);
-	}
+	return icc_set_bw(pcie->icc_mem, 0, width * bw);
 }
 
 static int qcom_pcie_link_transition_count(struct seq_file *s, void *data)
@@ -1529,7 +1524,10 @@ static int qcom_pcie_probe(struct platform_device *pdev)
 		goto err_phy_exit;
 	}
 
-	qcom_pcie_icc_update(pcie);
+	ret = qcom_pcie_icc_update(pcie);
+	if (ret)
+		dev_err(dev, "failed to update interconnect bandwidth: %d\n",
+			ret);
 
 	if (pcie->mhi)
 		qcom_pcie_init_debugfs(pcie);
@@ -1596,7 +1594,10 @@ static int qcom_pcie_resume_noirq(struct device *dev)
 		pcie->suspended = false;
 	}
 
-	qcom_pcie_icc_update(pcie);
+	ret = qcom_pcie_icc_update(pcie);
+	if (ret)
+		dev_err(dev, "failed to update interconnect bandwidth: %d\n",
+			ret);
 
 	return 0;
 }
-- 
2.7.4

On Thu, Sep 07, 2023 at 11:30:32AM +0530, Krishna chaitanya chundru wrote:
> Return error from the function if the icc path is specified in the
> dt and icc_set_bw failed or link is not up.
> 
> Signed-off-by: Krishna chaitanya chundru <quic_krichai@quicinc.com>
> ---
>  drivers/pci/controller/dwc/pcie-qcom.c | 23 ++++++++++++-----------
>  1 file changed, 12 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
> index e2f2940..ca6350b 100644
> --- a/drivers/pci/controller/dwc/pcie-qcom.c
> +++ b/drivers/pci/controller/dwc/pcie-qcom.c
> @@ -1357,22 +1357,21 @@ static int qcom_pcie_icc_init(struct qcom_pcie *pcie)
>  	return 0;
>  }
>  
> -static void qcom_pcie_icc_update(struct qcom_pcie *pcie)
> +static int qcom_pcie_icc_update(struct qcom_pcie *pcie)
>  {
>  	struct dw_pcie *pci = pcie->pci;
>  	u32 offset, status, bw;
>  	int speed, width;
> -	int ret;
>  
>  	if (!pcie->icc_mem)
> -		return;
> +		return 0;
>  
>  	offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
>  	status = readw(pci->dbi_base + offset + PCI_EXP_LNKSTA);
>  
>  	/* Only update constraints if link is up. */
>  	if (!(status & PCI_EXP_LNKSTA_DLLLA))
> -		return;
> +		return -ENODEV;

Why would you want to fail if the link is not up? This will break the driver if
device shows up later.

- Mani

>  
>  	speed = FIELD_GET(PCI_EXP_LNKSTA_CLS, status);
>  	width = FIELD_GET(PCI_EXP_LNKSTA_NLW, status);
> @@ -1392,11 +1391,7 @@ static void qcom_pcie_icc_update(struct qcom_pcie *pcie)
>  		break;
>  	}
>  
> -	ret = icc_set_bw(pcie->icc_mem, 0, width * bw);
> -	if (ret) {
> -		dev_err(pci->dev, "failed to set interconnect bandwidth: %d\n",
> -			ret);
> -	}
> +	return icc_set_bw(pcie->icc_mem, 0, width * bw);
>  }
>  
>  static int qcom_pcie_link_transition_count(struct seq_file *s, void *data)
> @@ -1529,7 +1524,10 @@ static int qcom_pcie_probe(struct platform_device *pdev)
>  		goto err_phy_exit;
>  	}
>  
> -	qcom_pcie_icc_update(pcie);
> +	ret = qcom_pcie_icc_update(pcie);
> +	if (ret)
> +		dev_err(dev, "failed to update interconnect bandwidth: %d\n",
> +			ret);
>  
>  	if (pcie->mhi)
>  		qcom_pcie_init_debugfs(pcie);
> @@ -1596,7 +1594,10 @@ static int qcom_pcie_resume_noirq(struct device *dev)
>  		pcie->suspended = false;
>  	}
>  
> -	qcom_pcie_icc_update(pcie);
> +	ret = qcom_pcie_icc_update(pcie);
> +	if (ret)
> +		dev_err(dev, "failed to update interconnect bandwidth: %d\n",
> +			ret);
>  
>  	return 0;
>  }
> -- 
> 2.7.4
> 

-- 
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