linux-kernel - Re: [PATCH v2] PCI: qcom: Enable MSI interrupts together with Link up if 'Global IRQ' is supported

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Message-ID: <20241103203714.GC237624@rocinante>
Date: Mon, 4 Nov 2024 05:37:14 +0900
From: Krzysztof Wilczyński <kw@...ux.com>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc: lpieralisi@...nel.org, 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>,
	Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Subject: Re: [PATCH v2] PCI: qcom: Enable MSI interrupts together with Link
 up if 'Global IRQ' is supported

Hello,

> Currently, if 'Global IRQ' is supported by the platform, only the Link up
> interrupt is enabled in the PARF_INT_ALL_MASK register. This masks MSIs
> on some platforms. The MSI bits in PARF_INT_ALL_MASK register are enabled
> by default in the hardware, but commit 4581403f6792 ("PCI: qcom: Enumerate
> endpoints based on Link up event in 'global_irq' interrupt") disabled them
> and enabled only the Link up interrupt. While MSI continued to work on the
> SM8450 platform that was used to test the offending commit, on other
> platforms like SM8250, X1E80100, MSIs are getting masked. And 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.

Applied to controller/qcom, thank you!

[01/01] PCI: qcom: Enable MSI interrupts together with Link up if 'Global IRQ' is supported
        https://git.kernel.org/pci/pci/c/ba4a2e2317b9

	Krzysztof