linux-kernel - [RFC PATCH v2 2/4] PCI: rockchip-host: Set Target Link Speed before retraining

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Message-ID: <87ca44fc3c34c5ffd3035d0d29b4ebabefed1c63.1749588810.git.geraldogabriel@gmail.com>
Date: Tue, 10 Jun 2025 18:20:04 -0300
From: Geraldo Nascimento <geraldogabriel@...il.com>
To: linux-rockchip@...ts.infradead.org
Cc: Shawn Lin <shawn.lin@...k-chips.com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Heiko Stuebner <heiko@...ech.de>, Vinod Koul <vkoul@...nel.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	linux-phy@...ts.infradead.org, linux-pci@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [RFC PATCH v2 2/4] PCI: rockchip-host: Set Target Link Speed before
 retraining

Current code may fail Gen2 retraining if Target Link Speed
is set to 2.5 GT/s in Link Control and Status Register 2.
Set it to 5.0 GT/s accordingly.

Signed-off-by: Geraldo Nascimento <geraldogabriel@...il.com>
---
 drivers/pci/controller/pcie-rockchip-host.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/pci/controller/pcie-rockchip-host.c b/drivers/pci/controller/pcie-rockchip-host.c
index b9e7a8710cf0..fd6f1a1d48bf 100644
--- a/drivers/pci/controller/pcie-rockchip-host.c
+++ b/drivers/pci/controller/pcie-rockchip-host.c
@@ -341,6 +341,10 @@ static int rockchip_pcie_host_init_port(struct rockchip_pcie *rockchip)
 		 * Enable retrain for gen2. This should be configured only after
 		 * gen1 finished.
 		 */
+		status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_LCS_2);
+		status &= ~PCI_EXP_LNKCTL2_TLS_2_5GT;
+		status |= PCI_EXP_LNKCTL2_TLS_5_0GT;
+		rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_LCS_2);
 		status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_LCS);
 		status |= PCI_EXP_LNKCTL_RL;
 		rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_LCS);
-- 
2.49.0