linux-kernel - Re: [PATCH v4 2/3] PCI: qcom: Set linkup_irq if global IRQ handler is present

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Message-ID: <20241115140013.ichb3ntic6jicsy5@thinkpad>
Date: Fri, 15 Nov 2024 19:30:13 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Krishna chaitanya chundru <quic_krichai@...cinc.com>
Cc: Jingoo Han <jingoohan1@...il.com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Konrad Dybcio <konradybcio@...nel.org>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	Krzysztof Wilczyński <kwilczynski@...nel.org>,
	quic_vbadigan@...cinc.com, quic_mrana@...cinc.com,
	andersson@...nel.org
Subject: Re: [PATCH v4 2/3] PCI: qcom: Set linkup_irq if global IRQ handler
 is present

On Fri, Nov 15, 2024 at 04:00:22PM +0530, Krishna chaitanya chundru wrote:
> In cases where a global IRQ handler is present to manage link up
> interrupts, it may not be necessary to wait for the link to be up
> during PCI initialization which optimizes the bootup time.
> 
> So, set use_linkup_irq flag if global IRQ is present and In order to set

s/In/in

> the use_linkup_irq flag before calling dw_pcie_host_init() API, which
> waits for link to be up, move platform_get_irq_byname_optional() API

s/API/call

> above dw_pcie_host_init().
> 
> Signed-off-by: Krishna chaitanya chundru <quic_krichai@...cinc.com>

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>

- Mani

> ---
>  drivers/pci/controller/dwc/pcie-qcom.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
> index ef44a82be058..c39d1c55b50e 100644
> --- a/drivers/pci/controller/dwc/pcie-qcom.c
> +++ b/drivers/pci/controller/dwc/pcie-qcom.c
> @@ -1692,6 +1692,10 @@ static int qcom_pcie_probe(struct platform_device *pdev)
>  
>  	platform_set_drvdata(pdev, pcie);
>  
> +	irq = platform_get_irq_byname_optional(pdev, "global");
> +	if (irq > 0)
> +		pp->use_linkup_irq = true;
> +
>  	ret = dw_pcie_host_init(pp);
>  	if (ret) {
>  		dev_err(dev, "cannot initialize host\n");
> @@ -1705,7 +1709,6 @@ static int qcom_pcie_probe(struct platform_device *pdev)
>  		goto err_host_deinit;
>  	}
>  
> -	irq = platform_get_irq_byname_optional(pdev, "global");
>  	if (irq > 0) {
>  		ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
>  						qcom_pcie_global_irq_thread,
> 
> -- 
> 2.34.1
> 

-- 
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