Re: [PATCH v2 2/4] phy: qcom-qmp-pcie: add endpoint support for sa8775p

[Dmitry Baryshkov]

On Wed, 11 Oct 2023 at 14:19, Mrinmay Sarkar <quic_msarkar@xxxxxxxxxxx> wrote:
>
> Add support for dual lane end point mode PHY found on sa8755p platform.
>
> Signed-off-by: Mrinmay Sarkar <quic_msarkar@xxxxxxxxxxx>
> ---
>  drivers/phy/qualcomm/phy-qcom-qmp-pcie.c   | 41 ++++++++++++++++++++++++++++++
>  drivers/phy/qualcomm/phy-qcom-qmp-pcs-v5.h |  2 ++
>  2 files changed, 43 insertions(+)

Two minor questions.

>
> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c b/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
> index a63ca74..962b4a1 100644
> --- a/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
> +++ b/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
> @@ -2147,6 +2147,38 @@ static const struct qmp_phy_init_tbl sa8775p_qmp_gen4x4_pcie_rc_serdes_alt_tbl[]
>         QMP_PHY_INIT_CFG(QSERDES_V5_COM_CLK_SELECT, 0x34),
>  };
>
> +static const struct qmp_phy_init_tbl sa8775p_qmp_gen4x2_pcie_ep_serdes_alt_tbl[] = {
> +       QMP_PHY_INIT_CFG(QSERDES_V5_COM_BG_TIMER, 0x02),
> +       QMP_PHY_INIT_CFG(QSERDES_V5_COM_SYS_CLK_CTRL, 0x07),
> +       QMP_PHY_INIT_CFG(QSERDES_V5_COM_CP_CTRL_MODE0, 0x27),
> +       QMP_PHY_INIT_CFG(QSERDES_V5_COM_CP_CTRL_MODE1, 0x0a),
> +       QMP_PHY_INIT_CFG(QSERDES_V5_COM_PLL_RCTRL_MODE0, 0x17),
> +       QMP_PHY_INIT_CFG(QSERDES_V5_COM_PLL_RCTRL_MODE1, 0x19),
> +       QMP_PHY_INIT_CFG(QSERDES_V5_COM_PLL_CCTRL_MODE0, 0x00),
> +       QMP_PHY_INIT_CFG(QSERDES_V5_COM_PLL_CCTRL_MODE1, 0x03),
> +       QMP_PHY_INIT_CFG(QSERDES_V5_COM_SYSCLK_EN_SEL, 0x00),
> +       QMP_PHY_INIT_CFG(QSERDES_V5_COM_INTEGLOOP_GAIN0_MODE0, 0xfb),
> +       QMP_PHY_INIT_CFG(QSERDES_V5_COM_INTEGLOOP_GAIN1_MODE0, 0x01),
> +       QMP_PHY_INIT_CFG(QSERDES_V5_COM_INTEGLOOP_GAIN0_MODE1, 0xfb),
> +       QMP_PHY_INIT_CFG(QSERDES_V5_COM_INTEGLOOP_GAIN1_MODE1, 0x01),
> +       QMP_PHY_INIT_CFG(QSERDES_V5_COM_CMN_MODE, 0x14),

I should check whether we miss QSERDES_V5_COM_CMN_MODE in
sm8450_qmp_gen4x2_pcie_ep_serdes_tbl, which is otherwise nearly
identical.
Also do you need to set QSERDES_V5_COM_CORE_CLK_EN here?

> +       QMP_PHY_INIT_CFG(QSERDES_V5_COM_LOCK_CMP1_MODE0, 0xff),
> +       QMP_PHY_INIT_CFG(QSERDES_V5_COM_LOCK_CMP2_MODE0, 0x04),
> +       QMP_PHY_INIT_CFG(QSERDES_V5_COM_LOCK_CMP1_MODE1, 0xff),
> +       QMP_PHY_INIT_CFG(QSERDES_V5_COM_LOCK_CMP2_MODE1, 0x09),
> +       QMP_PHY_INIT_CFG(QSERDES_V5_COM_DEC_START_MODE0, 0x19),
> +       QMP_PHY_INIT_CFG(QSERDES_V5_COM_DEC_START_MODE1, 0x28),
> +};
> +
> +static const struct qmp_phy_init_tbl sa8775p_qmp_gen4_pcie_ep_pcs_misc_tbl[] = {
> +       QMP_PHY_INIT_CFG(QPHY_V5_20_PCS_PCIE_OSC_DTCT_MODE2_CONFIG5, 0x08),
> +};

This is the same as sm8450_qmp_gen4x2_pcie_ep_pcs_misc_tbl

> +
> +static const struct qmp_phy_init_tbl sa8775p_qmp_gen4x2_pcie_ep_pcs_alt_tbl[] = {
> +       QMP_PHY_INIT_CFG(QPHY_V5_PCS_INSIG_MX_CTRL7, 0x00),
> +       QMP_PHY_INIT_CFG(QPHY_V5_PCS_INSIG_SW_CTRL7, 0x00),
> +};

Could you please confirm that these registers belong to the V5
namespace rather than V5_20 one?

> +
>  struct qmp_pcie_offsets {
>         u16 serdes;
>         u16 pcs;
> @@ -3043,6 +3075,15 @@ static const struct qmp_phy_cfg sa8775p_qmp_gen4x2_pciephy_cfg = {
>                 .pcs_misc_num   = ARRAY_SIZE(sa8775p_qmp_gen4_pcie_rc_pcs_misc_tbl),
>         },
>
> +       .tbls_ep = &(const struct qmp_phy_cfg_tbls) {
> +               .serdes         = sa8775p_qmp_gen4x2_pcie_ep_serdes_alt_tbl,
> +               .serdes_num     = ARRAY_SIZE(sa8775p_qmp_gen4x2_pcie_ep_serdes_alt_tbl),
> +               .pcs_misc       = sa8775p_qmp_gen4_pcie_ep_pcs_misc_tbl,
> +               .pcs_misc_num   = ARRAY_SIZE(sa8775p_qmp_gen4_pcie_ep_pcs_misc_tbl),
> +               .pcs            = sa8775p_qmp_gen4x2_pcie_ep_pcs_alt_tbl,
> +               .pcs_num        = ARRAY_SIZE(sa8775p_qmp_gen4x2_pcie_ep_pcs_alt_tbl),
> +       },
> +
>         .reset_list             = sdm845_pciephy_reset_l,
>         .num_resets             = ARRAY_SIZE(sdm845_pciephy_reset_l),
>         .vreg_list              = qmp_phy_vreg_l,
> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-pcs-v5.h b/drivers/phy/qualcomm/phy-qcom-qmp-pcs-v5.h
> index 36cc80b..6ee1c33 100644
> --- a/drivers/phy/qualcomm/phy-qcom-qmp-pcs-v5.h
> +++ b/drivers/phy/qualcomm/phy-qcom-qmp-pcs-v5.h
> @@ -11,6 +11,8 @@
>  #define QPHY_V5_PCS_PCS_STATUS1                                0x014
>  #define QPHY_V5_PCS_POWER_DOWN_CONTROL                 0x040
>  #define QPHY_V5_PCS_START_CONTROL                      0x044
> +#define QPHY_V5_PCS_INSIG_SW_CTRL7                     0x060
> +#define QPHY_V5_PCS_INSIG_MX_CTRL7                     0x07c
>  #define QPHY_V5_PCS_LOCK_DETECT_CONFIG1                        0x0c4
>  #define QPHY_V5_PCS_LOCK_DETECT_CONFIG2                        0x0c8
>  #define QPHY_V5_PCS_LOCK_DETECT_CONFIG3                        0x0cc
> --
> 2.7.4
>


-- 
With best wishes
Dmitry