linux-kernel - Re: [PATCH] phy: qcom-qmp-pcie: Fix X1E80100 PCIe Gen4 PHY initialisation

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Message-ID: <ZqOysDk0LqwxG4OF@hovoldconsulting.com>
Date: Fri, 26 Jul 2024 16:29:04 +0200
From: Johan Hovold <johan@...nel.org>
To: Abel Vesa <abel.vesa@...aro.org>
Cc: Vinod Koul <vkoul@...nel.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
	Johan Hovold <johan+linaro@...nel.org>,
	linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] phy: qcom-qmp-pcie: Fix X1E80100 PCIe Gen4 PHY
 initialisation

On Fri, Jul 26, 2024 at 10:16:56AM +0300, Abel Vesa wrote:
> Update the PCIe Gen4 PHY init sequence with the latest based on internal
> Qualcomm documentation.

Any hints about what these updates imply?

> Fixes: 606060ce8fd0 ("phy: qcom-qmp-pcie: Add support for X1E80100 g3x2 and g4x2 PCIE")
> Signed-off-by: Abel Vesa <abel.vesa@...aro.org>
> ---
>  drivers/phy/qualcomm/phy-qcom-qmp-pcie.c | 23 ++++++++++++++++-------
>  1 file changed, 16 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c b/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
> index 5b36cc7ac78b..8b624afbf014 100644
> --- a/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
> +++ b/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c

>  static const struct qmp_phy_init_tbl x1e80100_qmp_gen4x2_pcie_tx_tbl[] = {
> @@ -1286,12 +1287,15 @@ static const struct qmp_phy_init_tbl x1e80100_qmp_gen4x2_pcie_rx_tbl[] = {
>  	QMP_PHY_INIT_CFG(QSERDES_V6_20_RX_DFE_1, 0x01),
>  	QMP_PHY_INIT_CFG(QSERDES_V6_20_RX_DFE_2, 0x01),
>  	QMP_PHY_INIT_CFG(QSERDES_V6_20_RX_DFE_3, 0x45),
> -	QMP_PHY_INIT_CFG(QSERDES_V6_20_RX_VGA_CAL_MAN_VAL, 0x0b),
> +	QMP_PHY_INIT_CFG_LANE(QSERDES_V6_20_RX_VGA_CAL_MAN_VAL, 0x0A, 1),
> +	QMP_PHY_INIT_CFG_LANE(QSERDES_V6_20_RX_VGA_CAL_MAN_VAL, 0x0B, 2),

Please use lower-case hex consistently.

> +	QMP_PHY_INIT_CFG(QSERDES_V6_20_VGA_CAL_CNTRL1, 0x00),
>  	QMP_PHY_INIT_CFG(QSERDES_V6_20_RX_GM_CAL, 0x0d),
>  	QMP_PHY_INIT_CFG(QSERDES_V6_20_RX_EQU_ADAPTOR_CNTRL4, 0x0b),
>  	QMP_PHY_INIT_CFG(QSERDES_V6_20_RX_SIGDET_ENABLES, 0x1c),
>  	QMP_PHY_INIT_CFG(QSERDES_V6_20_RX_PHPRE_CTRL, 0x20),
> -	QMP_PHY_INIT_CFG(QSERDES_V6_20_RX_DFE_CTLE_POST_CAL_OFFSET, 0x38),
> +	QMP_PHY_INIT_CFG_LANE(QSERDES_V6_20_RX_DFE_CTLE_POST_CAL_OFFSET, 0x3A, 1),
> +	QMP_PHY_INIT_CFG_LANE(QSERDES_V6_20_RX_DFE_CTLE_POST_CAL_OFFSET, 0x38, 2),

Ditto.

Johan