linux-kernel - Re: [PATCH] PCI: qcom: Enable MSI interrupts together with Link up if global IRQ is supported

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Message-ID: <4a4860d0-3ec9-438f-b984-c9987743076f@quicinc.com>
Date: Wed, 2 Oct 2024 09:10:13 +0800
From: Qiang Yu <quic_qianyu@...cinc.com>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        <lpieralisi@...nel.org>, <kw@...ux.com>
CC: <robh@...nel.org>, <bhelgaas@...gle.com>, <linux-pci@...r.kernel.org>,
        <linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Konrad
 Dybcio <konradybcio@...nel.org>
Subject: Re: [PATCH] PCI: qcom: Enable MSI interrupts together with Link up if
 global IRQ is supported


On 9/30/2024 9:44 PM, Manivannan Sadhasivam wrote:
> Currently, if global IRQ is supported by the platform, only the Link up
> interrupt is enabled in the PARF_INT_ALL_MASK register. But on some Qcom
> platforms like SM8250, and X1E80100, MSIs are getting masked due to this.
> They require enabling the MSI interrupt bits in the register to unmask
> (enable) the MSIs.
>
> Even though the MSI interrupt enable bits in PARF_INT_ALL_MASK are
> described as 'diagnostic' interrupts in the internal documentation,
> disabling them masks MSI on these platforms. Due to this, MSIs were not
> reported to be received these platforms while supporting global IRQ.
>
> So enable the MSI interrupts along with the Link up interrupt in the
> PARF_INT_ALL_MASK register if global IRQ is supported. This ensures that
> the MSIs continue to work and also the driver is able to catch the Link
> up interrupt for enumerating endpoint devices.
>
> Fixes: 4581403f6792 ("PCI: qcom: Enumerate endpoints based on Link up event in 'global_irq' interrupt")
> Reported-by: Konrad Dybcio <konradybcio@...nel.org>
> Closes: https://lore.kernel.org/linux-pci/9a692c98-eb0a-4d86-b642-ea655981ff53@kernel.org/
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Reviewed-by: Qiang Yu <quic_qianyu@...cinc.com>

Thanks,
Qiang
> ---
>   drivers/pci/controller/dwc/pcie-qcom.c | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
> index ef44a82be058..2b33d03ed054 100644
> --- a/drivers/pci/controller/dwc/pcie-qcom.c
> +++ b/drivers/pci/controller/dwc/pcie-qcom.c
> @@ -133,6 +133,7 @@
>   
>   /* PARF_INT_ALL_{STATUS/CLEAR/MASK} register fields */
>   #define PARF_INT_ALL_LINK_UP			BIT(13)
> +#define PARF_INT_MSI_DEV_0_7			GENMASK(30, 23)
>   
>   /* PARF_NO_SNOOP_OVERIDE register fields */
>   #define WR_NO_SNOOP_OVERIDE_EN			BIT(1)
> @@ -1716,7 +1717,8 @@ static int qcom_pcie_probe(struct platform_device *pdev)
>   			goto err_host_deinit;
>   		}
>   
> -		writel_relaxed(PARF_INT_ALL_LINK_UP, pcie->parf + PARF_INT_ALL_MASK);
> +		writel_relaxed(PARF_INT_ALL_LINK_UP | PARF_INT_MSI_DEV_0_7,
> +			       pcie->parf + PARF_INT_ALL_MASK);
>   	}
>   
>   	qcom_pcie_icc_opp_update(pcie);