linux-kernel - RE: [PATCH v5 1/6] PCI: dwc: Remove the L1SS check before putting the link into L2

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Message-ID:
 <AS8PR04MB8833C4E6F51614D78D349E6C8C12A@AS8PR04MB8833.eurprd04.prod.outlook.com>
Date: Mon, 22 Sep 2025 06:34:40 +0000
From: Hongxing Zhu <hongxing.zhu@....com>
To: Manivannan Sadhasivam <mani@...nel.org>
CC: Frank Li <frank.li@....com>, "jingoohan1@...il.com"
	<jingoohan1@...il.com>, "l.stach@...gutronix.de" <l.stach@...gutronix.de>,
	"lpieralisi@...nel.org" <lpieralisi@...nel.org>, "kwilczynski@...nel.org"
	<kwilczynski@...nel.org>, "robh@...nel.org" <robh@...nel.org>,
	"bhelgaas@...gle.com" <bhelgaas@...gle.com>, "shawnguo@...nel.org"
	<shawnguo@...nel.org>, "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
	"kernel@...gutronix.de" <kernel@...gutronix.de>, "festevam@...il.com"
	<festevam@...il.com>, "linux-pci@...r.kernel.org"
	<linux-pci@...r.kernel.org>, "linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "imx@...ts.linux.dev"
	<imx@...ts.linux.dev>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v5 1/6] PCI: dwc: Remove the L1SS check before putting the
 link into L2

> -----Original Message-----
> From: Manivannan Sadhasivam <mani@...nel.org>
> Sent: 2025年9月20日 13:58
> To: Hongxing Zhu <hongxing.zhu@....com>
> Cc: Frank Li <frank.li@....com>; jingoohan1@...il.com;
> l.stach@...gutronix.de; lpieralisi@...nel.org; kwilczynski@...nel.org;
> robh@...nel.org; bhelgaas@...gle.com; shawnguo@...nel.org;
> s.hauer@...gutronix.de; kernel@...gutronix.de; festevam@...il.com;
> linux-pci@...r.kernel.org; linux-arm-kernel@...ts.infradead.org;
> imx@...ts.linux.dev; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH v5 1/6] PCI: dwc: Remove the L1SS check before putting
> the link into L2
> 
> On Tue, Sep 02, 2025 at 04:01:46PM +0800, Richard Zhu wrote:
> > Since this L1SS check is just an encapsulation problem, and the ASPM
> > shouldn't leak out here. Remove the L1SS check during L2 entry.
> >
> 
> Sorry, I couldnt' decipher this statement. Could you please elaborate?
>
It's my fault that I don't describe it clearly. Will update the commit message.
Here is the original discussion about this patch.
https://lore.kernel.org/imx/20250818154833.GA528281@bhelgaas/

Best Regards
Richard Zhu
 
> - Mani
> 
> > Fixes: 4774faf854f5 ("PCI: dwc: Implement generic suspend/resume
> > functionality")
> > Signed-off-by: Richard Zhu <hongxing.zhu@....com>
> > ---
> >  drivers/pci/controller/dwc/pcie-designware-host.c | 8 --------
> >  1 file changed, 8 deletions(-)
> >
> > diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c
> > b/drivers/pci/controller/dwc/pcie-designware-host.c
> > index 952f8594b501..9d46d1f0334b 100644
> > --- a/drivers/pci/controller/dwc/pcie-designware-host.c
> > +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
> > @@ -1005,17 +1005,9 @@ static int dw_pcie_pme_turn_off(struct dw_pcie
> > *pci)
> >
> >  int dw_pcie_suspend_noirq(struct dw_pcie *pci)  {
> > -	u8 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
> >  	u32 val;
> >  	int ret;
> >
> > -	/*
> > -	 * If L1SS is supported, then do not put the link into L2 as some
> > -	 * devices such as NVMe expect low resume latency.
> > -	 */
> > -	if (dw_pcie_readw_dbi(pci, offset + PCI_EXP_LNKCTL) &
> PCI_EXP_LNKCTL_ASPM_L1)
> > -		return 0;
> > -
> >  	if (pci->pp.ops->pme_turn_off) {
> >  		pci->pp.ops->pme_turn_off(&pci->pp);
> >  	} else {
> > --
> > 2.37.1
> >
> 
> --
> மணிவண்ணன் சதாசிவம்