linux-kernel - [PATCH v2 2/3] PCI: dwc: Simplify link speed configuration with macro

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Message-Id: <20250607155545.806496-3-18255117159@163.com>
Date: Sat,  7 Jun 2025 23:55:44 +0800
From: Hans Zhang <18255117159@....com>
To: bhelgaas@...gle.com,
	lpieralisi@...nel.org,
	kw@...ux.com,
	kwilczynski@...nel.org,
	mani@...nel.org,
	ilpo.jarvinen@...ux.intel.com,
	jingoohan1@...il.com
Cc: robh@...nel.org,
	linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Hans Zhang <18255117159@....com>
Subject: [PATCH v2 2/3] PCI: dwc: Simplify link speed configuration with macro

Replace switch-case based speed-to-register conversion in DesignWare
driver with the newly introduced PCIE_SPEED2LNKCTL2_TLS() macro.

Signed-off-by: Hans Zhang <18255117159@....com>
---
 drivers/pci/controller/dwc/pcie-designware.c | 18 +++---------------
 1 file changed, 3 insertions(+), 15 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
index 4d794964fa0f..da91b57ad744 100644
--- a/drivers/pci/controller/dwc/pcie-designware.c
+++ b/drivers/pci/controller/dwc/pcie-designware.c
@@ -768,24 +768,12 @@ static void dw_pcie_link_set_max_speed(struct dw_pcie *pci)
 	ctrl2 = dw_pcie_readl_dbi(pci, offset + PCI_EXP_LNKCTL2);
 	ctrl2 &= ~PCI_EXP_LNKCTL2_TLS;
 
-	switch (pcie_link_speed[pci->max_link_speed]) {
-	case PCIE_SPEED_2_5GT:
-		link_speed = PCI_EXP_LNKCTL2_TLS_2_5GT;
-		break;
-	case PCIE_SPEED_5_0GT:
-		link_speed = PCI_EXP_LNKCTL2_TLS_5_0GT;
-		break;
-	case PCIE_SPEED_8_0GT:
-		link_speed = PCI_EXP_LNKCTL2_TLS_8_0GT;
-		break;
-	case PCIE_SPEED_16_0GT:
-		link_speed = PCI_EXP_LNKCTL2_TLS_16_0GT;
-		break;
-	default:
+	link_speed = pcie_link_speed[pci->max_link_speed];
+	link_speed = PCIE_SPEED2LNKCTL2_TLS(link_speed);
+	if (link_speed == 0) {
 		/* Use hardware capability */
 		link_speed = FIELD_GET(PCI_EXP_LNKCAP_SLS, cap);
 		ctrl2 &= ~PCI_EXP_LNKCTL2_HASD;
-		break;
 	}
 
 	dw_pcie_writel_dbi(pci, offset + PCI_EXP_LNKCTL2, ctrl2 | link_speed);
-- 
2.25.1