From f2ec4723defbc66a50e0abafa830ae9f8bceb0d7 Mon Sep 17 00:00:00 2001 From: Rafael Beims Date: Tue, 23 Dec 2025 12:02:54 -0300 Subject: [PATCH] phy: freescale: imx8m-pcie: assert phy reset during power on After U-Boot initializes PCIe with "pcie enum", Linux fails to detect an NVMe disk on some boot cycles with: phy phy-32f00000.pcie-phy.0: phy poweron failed --> -110 Discussion with NXP identified that the iMX8MP PCIe PHY PLL may fail to lock when re-initialized without a reset cycle [1]. The issue reproduces on 7% of tested hardware platforms, with a 30-40% failure rate per affected device across boot cycles. Insert a reset cycle in the power-on routine to ensure the PHY is initialized from a known state. [1] https://community.nxp.com/t5/i-MX-Processors/iMX8MP-PCIe-initialization-in-U-Boot/m-p/2248437#M242401 Signed-off-by: Rafael Beims Cc: stable@vger.kernel.org Link: https://patch.msgid.link/20251223150254.1075221-1-rafael@beims.me Signed-off-by: Vinod Koul --- drivers/phy/freescale/phy-fsl-imx8m-pcie.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/phy/freescale/phy-fsl-imx8m-pcie.c b/drivers/phy/freescale/phy-fsl-imx8m-pcie.c index 68fcc8114d750..7f5600103a001 100644 --- a/drivers/phy/freescale/phy-fsl-imx8m-pcie.c +++ b/drivers/phy/freescale/phy-fsl-imx8m-pcie.c @@ -89,7 +89,8 @@ static int imx8_pcie_phy_power_on(struct phy *phy) writel(imx8_phy->tx_deemph_gen2, imx8_phy->base + PCIE_PHY_TRSV_REG6); break; - case IMX8MP: /* Do nothing. */ + case IMX8MP: + reset_control_assert(imx8_phy->reset); break; } -- 2.47.3