linux-kernel - Re: [PATCH] PCI: cadence: Fixed cdns_pcie_host_link

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Message-ID: <44c74561-a4db-4550-a07e-67f51556dd03@163.com>
Date: Fri, 20 Dec 2024 15:27:22 +0800
From: Hans Zhang <18255117159@....com>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc: Siddharth Vadapalli <s-vadapalli@...com>, lpieralisi@...nel.org,
 kw@...ux.com, robh@...nel.org, bhelgaas@...gle.com,
 thomas.richard@...tlin.com, linux-pci@...r.kernel.org,
 linux-kernel@...r.kernel.org, rockswang7@...il.com
Subject: Re: [PATCH] PCI: cadence: Fixed cdns_pcie_host_link_setup return
 value.

On 12/19/24 08:35, Manivannan Sadhasivam wrote:

>> We have 5 PCIe controllers, and if a few of them are not connected to the
>> device. And it will affect the boot time.
>>
> 
> Why are you enabling all controllers? Can't you just enable the ones you know
> the endpoints are going to be connected? I'm just trying to see if we can avoid
> having a quirk.

Our SOC has a PC product situation, and there may be PCIe slots on the 
PCB, but the device may not be plugged in. So we need to enable all ports.

> If you do not know, then you need to introduce a quirk for your platform.
> But that requires your controller driver to be upstreamed. We cannot provide
> hooks for downstream drivers in upstream.

Our controller driver currently has no plans for upstream and needs to 
wait for notification from the boss.

Regards
Hans