linux-kernel - [PATCH v3 3/3] PCI: aardvark: Remove redundant MPS configuration

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Message-Id: <20250506173439.292460-4-18255117159@163.com>
Date: Wed,  7 May 2025 01:34:39 +0800
From: Hans Zhang <18255117159@....com>
To: lpieralisi@...nel.org,
	kw@...ux.com,
	bhelgaas@...gle.com,
	heiko@...ech.de,
	manivannan.sadhasivam@...aro.org,
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Cc: 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,
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	Hans Zhang <18255117159@....com>
Subject: [PATCH v3 3/3] PCI: aardvark: Remove redundant MPS configuration

The Aardvark PCIe controller enforces a fixed 512B payload size via
PCI_EXP_DEVCTL_PAYLOAD_512B, overriding hardware capabilities and PCIe
core negotiations.

Remove explicit MPS overrides (PCI_EXP_DEVCTL_PAYLOAD and
PCI_EXP_DEVCTL_PAYLOAD_512B). MPS is now determined by the PCI core
during device initialization, leveraging root port configurations and
device-specific capabilities.

Aligning Aardvark with the unified MPS framework ensures consistency,
avoids artificial constraints, and allows the hardware to operate at
its maximum supported payload size while adhering to PCIe specifications.

Signed-off-by: Hans Zhang <18255117159@....com>
---
 drivers/pci/controller/pci-aardvark.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
index a29796cce420..d8852892994a 100644
--- a/drivers/pci/controller/pci-aardvark.c
+++ b/drivers/pci/controller/pci-aardvark.c
@@ -549,9 +549,7 @@ static void advk_pcie_setup_hw(struct advk_pcie *pcie)
 	reg = advk_readl(pcie, PCIE_CORE_PCIEXP_CAP + PCI_EXP_DEVCTL);
 	reg &= ~PCI_EXP_DEVCTL_RELAX_EN;
 	reg &= ~PCI_EXP_DEVCTL_NOSNOOP_EN;
-	reg &= ~PCI_EXP_DEVCTL_PAYLOAD;
 	reg &= ~PCI_EXP_DEVCTL_READRQ;
-	reg |= PCI_EXP_DEVCTL_PAYLOAD_512B;
 	reg |= PCI_EXP_DEVCTL_READRQ_512B;
 	advk_writel(pcie, reg, PCIE_CORE_PCIEXP_CAP + PCI_EXP_DEVCTL);
 
-- 
2.25.1