linux-kernel - Re: [PATCH v4 1/2] PCI: mediatek-gen3: Add support for setting max-link-speed limit

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Message-ID: <f8ca0f82-2851-40d9-983b-2a143b44263a@collabora.com>
Date: Mon, 4 Nov 2024 14:10:22 +0100
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Krzysztof Wilczyński <kw@...ux.com>,
 linux-pci@...r.kernel.org
Cc: ryder.lee@...iatek.com, jianjun.wang@...iatek.com, lpieralisi@...nel.org,
 robh@...nel.org, bhelgaas@...gle.com, matthias.bgg@...il.com,
 linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, kernel@...labora.com,
 fshao@...omium.org, Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Subject: Re: [PATCH v4 1/2] PCI: mediatek-gen3: Add support for setting
 max-link-speed limit

Il 04/11/24 14:06, Krzysztof Wilczyński ha scritto:
> Hello,
> 
>> +	if (err > 0) {
> 
> You could drop > 0 here.
> 

I have no strong opinions about that, would be fine for me.

>> +		/* Get the maximum speed supported by the controller */
>> +		max_speed = mtk_pcie_get_controller_max_link_speed(pcie);
>> +
>> +		/* Set max_link_speed only if the controller supports it */
>> +		if (max_speed >= 0 && max_speed <= err) {
>> +			pcie->max_link_speed = err;
>> +			dev_dbg(pcie->dev,
>> +				"Max controller link speed Gen%d, override to Gen%u",
>> +				max_speed, pcie->max_link_speed);
>> +		}
>> +	}
> 
> I wonder if this debug message would be better served as a warning to let
> the user know that the speed has been overridden due to the platform
> limitation.  Thoughts?
> 
> Also, there is no need to sent a new series if you fine with the
> suggestions.  I will mend the code on the branch when applying.
> 

A warning seems to be a bit too much and would appear like something to worry
about (or something unintended)...

Perhaps a dev_info() would work better here?

Thanks,
Angelo

> 	Krzysztof