[PATCH v1 1/1] phy: freescale: imx8m-pcie: fix pcie link-up instability

[Hongxing Zhu]

> -----Original Message-----
> From: Marcel Ziswiler <marcel at ziswiler.com>
> Sent: 2024年3月22日 21:07
> To: linux-phy at lists.infradead.org
> Cc: dl-linux-imx <linux-imx at nxp.com>; Lucas Stach <l.stach at pengutronix.de>;
> linux-arm-kernel at lists.infradead.org; kernel at pengutronix.de; Hongxing Zhu
> <hongxing.zhu at nxp.com>; linux-kernel at vger.kernel.org; Marcel Ziswiler
> <marcel.ziswiler at toradex.com>; Fabio Estevam <festevam at gmail.com>; Heiko
> Stuebner <heiko at sntech.de>; Kishon Vijay Abraham I <kishon at kernel.org>;
> Marc Kleine-Budde <mkl at pengutronix.de>; Rob Herring <robh at kernel.org>;
> Sascha Hauer <s.hauer at pengutronix.de>; Shawn Guo <shawnguo at kernel.org>;
> tharvey at gateworks.com; Vinod Koul <vkoul at kernel.org>; Yang Li
> <yang.lee at linux.alibaba.com>; imx at lists.linux.dev
> Subject: [PATCH v1 1/1] phy: freescale: imx8m-pcie: fix pcie link-up instability
> 
> From: Marcel Ziswiler <marcel.ziswiler at toradex.com>
> 
> Leaving AUX_PLL_REFCLK_SEL at its reset default of AUX_IN (PLL clock) proves to
> be more stable on the i.MX 8M Mini.
> 
> Fixes: 1aa97b002258 ("phy: freescale: pcie: Initialize the imx8 pcie standalone
> phy driver")
> 
Hi Marcel
I took look back at the validation codes.
i.MX8MM PCIe doesn't configure cmn_reg063 (offset: 0x18C) indeed.

It's my bad to treat i.MX8MM same as i.MX8MP refer to my assumption on the
 literal meaning of these bit definitions.

Reviewed-by: Richard Zhu <hongxing.zhu at nxp.com>

Best Regards
Richard Zhu

> Signed-off-by: Marcel Ziswiler <marcel.ziswiler at toradex.com>
> ---
> 
>  drivers/phy/freescale/phy-fsl-imx8m-pcie.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/phy/freescale/phy-fsl-imx8m-pcie.c
> b/drivers/phy/freescale/phy-fsl-imx8m-pcie.c
> index b700f52b7b67..11fcb1867118 100644
> --- a/drivers/phy/freescale/phy-fsl-imx8m-pcie.c
> +++ b/drivers/phy/freescale/phy-fsl-imx8m-pcie.c
> @@ -110,8 +110,10 @@ static int imx8_pcie_phy_power_on(struct phy *phy)
>  		/* Source clock from SoC internal PLL */
>  		writel(ANA_PLL_CLK_OUT_TO_EXT_IO_SEL,
>  		       imx8_phy->base + IMX8MM_PCIE_PHY_CMN_REG062);
> -		writel(AUX_PLL_REFCLK_SEL_SYS_PLL,
> -		       imx8_phy->base + IMX8MM_PCIE_PHY_CMN_REG063);
> +		if (imx8_phy->drvdata->variant != IMX8MM) {
> +			writel(AUX_PLL_REFCLK_SEL_SYS_PLL,
> +			       imx8_phy->base + IMX8MM_PCIE_PHY_CMN_REG063);
> +		}
>  		val = ANA_AUX_RX_TX_SEL_TX | ANA_AUX_TX_TERM;
>  		writel(val | ANA_AUX_RX_TERM_GND_EN,
>  		       imx8_phy->base + IMX8MM_PCIE_PHY_CMN_REG064);
> --
> 2.44.0