linux-kernel - Re: [PATCH V7 2/5] PCI/TPH: Add Steering Tag support

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Message-ID: <f6b34f2e-31c9-4997-abfe-38d7e774b4fa@amd.com>
Date: Tue, 4 Feb 2025 14:18:36 -0600
From: Wei Huang <wei.huang2@....com>
To: Robin Murphy <robin.murphy@....com>, linux-pci@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
 netdev@...r.kernel.org
Cc: Jonathan.Cameron@...wei.com, helgaas@...nel.org, corbet@....net,
 davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
 pabeni@...hat.com, alex.williamson@...hat.com, gospo@...adcom.com,
 michael.chan@...adcom.com, ajit.khaparde@...adcom.com,
 somnath.kotur@...adcom.com, andrew.gospodarek@...adcom.com,
 manoj.panicker2@....com, Eric.VanTassell@....com, vadim.fedorenko@...ux.dev,
 horms@...nel.org, bagasdotme@...il.com, bhelgaas@...gle.com,
 lukas@...ner.de, paul.e.luse@...el.com, jing2.liu@...el.com
Subject: Re: [PATCH V7 2/5] PCI/TPH: Add Steering Tag support



On 2/4/25 12:33 PM, Robin Murphy wrote:
> On 2024-10-02 5:59 pm, Wei Huang wrote:
> [...]
>> +
>> +	if (err) {
>> +		pcie_disable_tph(pdev);
>> +		return err;
>> +	}
>> +
>> +	set_ctrl_reg_req_en(pdev, pdev->tph_mode);
> 
> Just looking at this code in mainline, and I don't trust my
> understanding quite enough to send a patch myself, but doesn't this want
> to be pdev->tph_req_type, rather than tph_mode?

Yeah, you are right - this is supposed to be pdev->tph_req_type instead 
of tph_mode. We disable TPH first by clearing (zero) the "TPH Requester 
Enable" field and needs to set it back using tph_req_type.

Do you want to send in a fix? I can ACK it. Thanks for spotting it.

-Wei

> 
> Thanks,
> Robin.
>