linux-kernel - Re: [PATCH v5 0/3] PCI: dwc: Skip waiting for link up if vendor drivers can detect Link up event

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Message-ID: <20250115111954.GE4176564@rocinante>
Date: Wed, 15 Jan 2025 20:19:54 +0900
From: Krzysztof Wilczyński <kw@...ux.com>
To: Krishna chaitanya chundru <quic_krichai@...cinc.com>
Cc: Jingoo Han <jingoohan1@...il.com>,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	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,
	andersson@...nel.org, quic_vbadigan@...cinc.com,
	quic_mrana@...cinc.com
Subject: Re: [PATCH v5 0/3] PCI: dwc: Skip waiting for link up if vendor
 drivers can detect Link up event

Hello,

> If the vendor drivers can detect the Link up event using mechanisms
> such as Link up IRQ, then waiting for Link up during probe is not
> needed. if the drivers can be notified when the link comes up,
> vendor driver can enumerate downstream devices instead of waiting
> here, which optimizes the boot time.
> 
> So skip waiting for link to be up if the driver supports 'use_linkup_irq'.
> 
> Currently, only Qcom RC driver supports the 'use_linkup_irq' as it can
> detect the Link Up event using its own 'global IRQ' interrupt. So set
> 'use_linkup_irq' flag for QCOM drivers.
> 
> And as part of the PCIe link up event, the ICC and OPP values are updated.

Applied to controller/dwc for v6.14, thank you!

	Krzysztof