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

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Message-ID: <4cdc804b-6b33-4420-a245-1a6db47e17e3@oss.qualcomm.com>
Date: Fri, 4 Oct 2024 11:23:46 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.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,
        quic_qianyu@...cinc.com, Konrad Dybcio <konradybcio@...nel.org>
Subject: Re: [PATCH] PCI: qcom: Enable MSI interrupts together with Link up if
 global IRQ is supported

On 30.09.2024 3:44 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>
> ---

Tested-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com> # SL7

Konrad