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Message-ID: <d9a55de7-fcc7-97fb-3f27-31ab273cf1aa@ti.com>
Date: Wed, 12 Jul 2023 13:57:16 +0530
From: "Verma, Achal" <a-verma1@...com>
To: Li Chen <me@...ux.beauty>
CC: Vignesh Raghavendra <vigneshr@...com>,
Tom Joseph <tjoseph@...ence.com>,
Lorenzo Pieralisi <lpieralisi@...nel.org>,
Krzysztof Wilczyński <kw@...ux.com>,
Rob Herring <robh@...nel.org>,
Bjorn Helgaas <bhelgaas@...gle.com>,
linux-omap <linux-omap@...r.kernel.org>,
linux-pci <linux-pci@...r.kernel.org>,
linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [EXTERNAL] Re: [PATCH 1/2] PCI: j721e: Allow async probe
On 7/11/2023 2:13 PM, Li Chen wrote:
>
> ---- On Tue, 11 Jul 2023 14:16:01 +0800 Verma, Achal wrote ---
> >
> >
> > On 7/7/2023 7:53 AM, Li Chen wrote:
> > > From: Li Chen lchen@...arella.com>
> > >
> > > I observed that on Ambarella SoC, which also utilizes
> > > the Cadence controller, the boot time increases by 1
> > > second when no endpoints (including switch) are connected
> > > to PCIe. This increase is caused by cdns_pcie_host_wait_for_link.
> > >
> > > Enabling async probe can eliminate this boot time increase.
> > >
> > > I guess j721e also has this issue.
> > I have tested this along with:
> > https://lore.kernel.org
> > /all/1892e2ae15f.f7e5dc061620757.4339091752690983066@...ux.beauty/
> >
> > But I couldn't find second patch in this series.
>
> Sorry for my mistake, the second patch is just the link you mentioned(https://lore.kernel.org/all/1892e2ae15f.f7e5dc061620757.4339091752690983066@linux.beauty/), I accidentally removed its "2/2" prefix.
>
> Should I post v2 to fix the subject issue?
I think you have to ask maintainers for this.
>
> > >
> > > Signed-off-by: Li Chen lchen@...arella.com>
> > Tested-by: Achal Verma a-verma1@...com>
> > > ---
> > > drivers/pci/controller/cadence/pci-j721e.c | 1 +
> > > 1 file changed, 1 insertion(+)
> > >
> > > diff --git a/drivers/pci/controller/cadence/pci-j721e.c b/drivers/pci/controller/cadence/pci-j721e.c
> > > index e70213c9060a..660c13bdb606 100644
> > > --- a/drivers/pci/controller/cadence/pci-j721e.c
> > > +++ b/drivers/pci/controller/cadence/pci-j721e.c
> > > @@ -561,6 +561,7 @@ static struct platform_driver j721e_pcie_driver = {
> > > .name = "j721e-pcie",
> > > .of_match_table = of_j721e_pcie_match,
> > > .suppress_bind_attrs = true,
> > > + .probe_type = PROBE_PREFER_ASYNCHRONOUS,
> > > },
> > > };
> > > builtin_platform_driver(j721e_pcie_driver);
> >
>
> Regards,
> Li
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