From: Richard Zhu hongxing.zhu@nxp.com
When enable initcall_debug together with higher debug level below. CONFIG_CONSOLE_LOGLEVEL_DEFAULT=9 CONFIG_CONSOLE_LOGLEVEL_QUIET=9 CONFIG_MESSAGE_LOGLEVEL_DEFAULT=7
The initialization of i.MX8MP PCIe PHY might be timeout failed randomly. To fix this issue, adjust the sequence of the resets refer to the power up sequence listed below.
i.MX8MP PCIe PHY power up sequence: /--------------------------------------------- 1.8v supply ---------/ /--------------------------------------------------- 0.8v supply ---/
---\ /-------------------------------------------------- X REFCLK Valid Reference Clock ---/ -------------------------------------------------- ------------------------------------------- | i_init_restn -------------- ------------------------------------ | i_cmn_rstn --------------------- ------------------------------- | o_pll_lock_done --------------------------
Logs: imx6q-pcie 33800000.pcie: host bridge /soc@0/pcie@33800000 ranges: imx6q-pcie 33800000.pcie: IO 0x001ff80000..0x001ff8ffff -> 0x0000000000 imx6q-pcie 33800000.pcie: MEM 0x0018000000..0x001fefffff -> 0x0018000000 probe of clk_imx8mp_audiomix.reset.0 returned 0 after 1052 usecs probe of 30e20000.clock-controller returned 0 after 32971 usecs phy phy-32f00000.pcie-phy.4: phy poweron failed --> -110 probe of 30e10000.dma-controller returned 0 after 10235 usecs imx6q-pcie 33800000.pcie: waiting for PHY ready timeout! dwhdmi-imx 32fd8000.hdmi: Detected HDMI TX controller v2.13a with HDCP (samsung_dw_hdmi_phy2) imx6q-pcie 33800000.pcie: probe with driver imx6q-pcie failed with error -110
Fixes: dce9edff16ee ("phy: freescale: imx8m-pcie: Add i.MX8MP PCIe PHY support") Cc: stable@vger.kernel.org Signed-off-by: Richard Zhu hongxing.zhu@nxp.com Signed-off-by: Frank Li Frank.Li@nxp.com
v2 changes: - Rebase to latest fixes branch of linux-phy git repo. - Richard's environment have problem and can't sent out patch. So I help post this fix patch. --- drivers/phy/freescale/phy-fsl-imx8m-pcie.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/drivers/phy/freescale/phy-fsl-imx8m-pcie.c b/drivers/phy/freescale/phy-fsl-imx8m-pcie.c index 11fcb1867118c..e98361dcdeadf 100644 --- a/drivers/phy/freescale/phy-fsl-imx8m-pcie.c +++ b/drivers/phy/freescale/phy-fsl-imx8m-pcie.c @@ -141,11 +141,6 @@ static int imx8_pcie_phy_power_on(struct phy *phy) IMX8MM_GPR_PCIE_REF_CLK_PLL); usleep_range(100, 200);
- /* Do the PHY common block reset */ - regmap_update_bits(imx8_phy->iomuxc_gpr, IOMUXC_GPR14, - IMX8MM_GPR_PCIE_CMN_RST, - IMX8MM_GPR_PCIE_CMN_RST); - switch (imx8_phy->drvdata->variant) { case IMX8MP: reset_control_deassert(imx8_phy->perst); @@ -156,6 +151,11 @@ static int imx8_pcie_phy_power_on(struct phy *phy) break; }
+ /* Do the PHY common block reset */ + regmap_update_bits(imx8_phy->iomuxc_gpr, IOMUXC_GPR14, + IMX8MM_GPR_PCIE_CMN_RST, + IMX8MM_GPR_PCIE_CMN_RST); + /* Polling to check the phy is ready or not. */ ret = readl_poll_timeout(imx8_phy->base + IMX8MM_PCIE_PHY_CMN_REG075, val, val == ANA_PLL_DONE, 10, 20000);