linux-kernel - Re: [PATCH v12 1/3] PCI: vmd: Set PCI devices to D0 before enable PCI PM's L1 substates

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Message-ID: <20241103204001.GD237624@rocinante>
Date: Mon, 4 Nov 2024 05:40:01 +0900
From: Krzysztof Wilczyński <kw@...ux.com>
To: Jian-Hong Pan <jhp@...lessos.org>
Cc: Bjorn Helgaas <helgaas@...nel.org>, Johan Hovold <johan@...nel.org>,
	David Box <david.e.box@...ux.intel.com>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
	Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>,
	Nirmal Patel <nirmal.patel@...ux.intel.com>,
	Jonathan Derrick <jonathan.derrick@...ux.dev>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux@...lessos.org
Subject: Re: [PATCH v12 1/3] PCI: vmd: Set PCI devices to D0 before enable
 PCI PM's L1 substates

Hello,

> The remapped PCIe Root Port and the child device have PCI PM L1 substates
> capability, but they are disabled originally.
> 
> Here is a failed example on ASUS B1400CEAE:
> 
> Capabilities: [900 v1] L1 PM Substates
> 	L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1- ASPM_L1.2+ ASPM_L1.1- L1_PM_Substates+
> 		  PortCommonModeRestoreTime=32us PortTPowerOnTime=10us
> 	L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2+ ASPM_L1.1-
> 		   T_CommonMode=0us LTR1.2_Threshold=101376ns
> 	L1SubCtl2: T_PwrOn=50us
> 
> Power on all of the VMD remapped PCI devices to D0 before enable PCI-PM L1
> PM Substates by following "PCIe r6.0, sec 5.5.4".

Applied to controller/vmd, thank you!

[01/01] PCI: vmd: Set PCI devices to D0 before enable PCI PM's L1 substates
        https://git.kernel.org/pci/pci/c/c8d39213cb70

	Krzysztof