linux-kernel - [PATCH v3 2/3] PCI: dwc: Remove redundant MPS configuration

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Message-Id: <20250506173439.292460-3-18255117159@163.com>
Date: Wed,  7 May 2025 01:34:38 +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 2/3] PCI: dwc: Remove redundant MPS configuration

The Meson PCIe controller driver manually configures maximum payload
size (MPS) through meson_set_max_payload, duplicating functionality now
centralized in the PCI core.  Deprecating redundant code simplifies the
driver and aligns it with the consolidated MPS management strategy,
improving long-term maintainability.

Signed-off-by: Hans Zhang <18255117159@....com>
---
 drivers/pci/controller/dwc/pci-meson.c | 17 -----------------
 1 file changed, 17 deletions(-)

diff --git a/drivers/pci/controller/dwc/pci-meson.c b/drivers/pci/controller/dwc/pci-meson.c
index db9482a113e9..126f38ed453d 100644
--- a/drivers/pci/controller/dwc/pci-meson.c
+++ b/drivers/pci/controller/dwc/pci-meson.c
@@ -261,22 +261,6 @@ static int meson_size_to_payload(struct meson_pcie *mp, int size)
 	return fls(size) - 8;
 }
 
-static void meson_set_max_payload(struct meson_pcie *mp, int size)
-{
-	struct dw_pcie *pci = &mp->pci;
-	u32 val;
-	u16 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
-	int max_payload_size = meson_size_to_payload(mp, size);
-
-	val = dw_pcie_readl_dbi(pci, offset + PCI_EXP_DEVCTL);
-	val &= ~PCI_EXP_DEVCTL_PAYLOAD;
-	dw_pcie_writel_dbi(pci, offset + PCI_EXP_DEVCTL, val);
-
-	val = dw_pcie_readl_dbi(pci, offset + PCI_EXP_DEVCTL);
-	val |= PCIE_CAP_MAX_PAYLOAD_SIZE(max_payload_size);
-	dw_pcie_writel_dbi(pci, offset + PCI_EXP_DEVCTL, val);
-}
-
 static void meson_set_max_rd_req_size(struct meson_pcie *mp, int size)
 {
 	struct dw_pcie *pci = &mp->pci;
@@ -381,7 +365,6 @@ static int meson_pcie_host_init(struct dw_pcie_rp *pp)
 
 	pp->bridge->ops = &meson_pci_ops;
 
-	meson_set_max_payload(mp, MAX_PAYLOAD_SIZE);
 	meson_set_max_rd_req_size(mp, MAX_READ_REQ_SIZE);
 
 	return 0;
-- 
2.25.1