linux-kernel - Re: [PATCH v2 2/2] PCI: Remove redundant MPS configuration

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Message-ID: <7c7d5e12-7378-473e-941a-33c1b03cc8c9@163.com>
Date: Fri, 25 Apr 2025 18:26:16 +0800
From: Hans Zhang <18255117159@....com>
To: Niklas Cassel <cassel@...nel.org>
Cc: lpieralisi@...nel.org, kw@...ux.com, bhelgaas@...gle.com,
 heiko@...ech.de, thomas.petazzoni@...tlin.com,
 manivannan.sadhasivam@...aro.org, yue.wang@...ogic.com, pali@...nel.org,
 neil.armstrong@...aro.org, robh@...nel.org, jingoohan1@...il.com,
 khilman@...libre.com, jbrunet@...libre.com,
 martin.blumenstingl@...glemail.com, linux-pci@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-amlogic@...ts.infradead.org, linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH v2 2/2] PCI: Remove redundant MPS configuration



On 2025/4/25 18:17, Niklas Cassel wrote:
> On Fri, Apr 25, 2025 at 05:57:08PM +0800, Hans Zhang wrote:
>> With the PCI core now centrally configuring root port MPS to
>> hardware-supported maximums (via 128 << pcie_mpss) during host probing,
>> platform-specific MPS adjustments are redundant. This patch removes the
>> custom the configuration of the max payload logic to align with the
>> standardized initialization flow.
>>
>> By eliminating redundant code, this change prevents conflicts with global
>> PCIe hierarchy tuning policies and reduces maintenance overhead. The Meson
>> driver now fully relies on the core PCI framework for MPS configuration,
>> ensuring consistency across the PCIe topology while preserving
>> hardware-specific MRRS handling.
>>
>> Signed-off-by: Hans Zhang <18255117159@....com>
>> ---
>>   drivers/pci/controller/dwc/pci-meson.c | 17 -----------------
>>   drivers/pci/controller/pci-aardvark.c  |  2 --
> 
> Since you are touching two drivers (and the changes are not exactly identical),
> I suggest that you do one patch per driver.

Dear Niklas,

Thank you very much for your reply. In the next version, I will split 
two patches.

Best regards,
Hans