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: <6f815dd0-f111-6f7e-16dc-80b0dad7806a@quicinc.com>
Date: Mon, 23 Dec 2024 12:25:35 +0530
From: Krishna Chaitanya Chundru <quic_krichai@...cinc.com>
To: Jingoo Han <jingoohan1@...il.com>,
        Manivannan Sadhasivam
	<manivannan.sadhasivam@...aro.org>,
        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>
CC: <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-msm@...r.kernel.org>,
        Krzysztof Wilczyński
	<kwilczynski@...nel.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


Could this series be picked up?

- Krishna Chaitanya.

On 11/23/2024 12:39 AM, Krishna chaitanya chundru wrote:
> 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.
> 
> Signed-off-by: Krishna chaitanya chundru <quic_krichai@...cinc.com>
> ---
> Changes in v5:
> - update the commit text as suggested by (mani).
> Changes in v4:
> - change the linkup_irq name to use_linkup_irq a suggested by (bjorn
>    andresson)
> - update commit text as suggested by bjorn andresson.
> - Link to v3: https://lore.kernel.org/r/linux-arm-msm/20241101-remove_wait-v3-0-7accf27f7202@quicinc.com/T/
> Changes in v3:
> - seperate dwc changes and qcom changes as suggested (mani)
> - update commit & comments as suggested (mani & bjorn)
> - Link to v2: https://lore.kernel.org/linux-pci/20240920-remove_wait-v2-0-7c0fcb3b581d@quicinc.com/T/
> Changes in v2:
> - Updated the bypass_link_up_wait name to linkup_irq  & added comment as
>    suggested (mani).
> - seperated the icc and opp update patch (mani).
> - Link to v1: https://lore.kernel.org/r/20240917-remove_wait-v1-1-456d2551bc50@quicinc.com
> 
> ---
> Krishna chaitanya chundru (3):
>        PCI: dwc: Skip waiting for link up if vendor drivers can detect Link up event
>        PCI: qcom: Set use_linkup_irq if global IRQ handler is present
>        PCI: qcom: Update ICC and OPP values during link up event
> 
>   drivers/pci/controller/dwc/pcie-designware-host.c | 10 ++++++++--
>   drivers/pci/controller/dwc/pcie-designware.h      |  1 +
>   drivers/pci/controller/dwc/pcie-qcom.c            |  7 ++++++-
>   3 files changed, 15 insertions(+), 3 deletions(-)
> ---
> base-commit: cfba9f07a1d6aeca38f47f1f472cfb0ba133d341
> change-id: 20241122-remove_wait2-d581b40380ea
> 
> Best regards,