Commit f2ec4723 authored by Rafael Beims's avatar Rafael Beims Committed by Vinod Koul
Browse files

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: default avatarRafael Beims <rafael.beims@toradex.com>
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20251223150254.1075221-1-rafael@beims.me


Signed-off-by: default avatarVinod Koul <vkoul@kernel.org>
parent e07dea3d

drivers/phy/freescale/phy-fsl-imx8m-pcie.c

+2 −1
Original line number Diff line number Diff line
@@ -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;

	}