linux-kernel - Re: [PATCH 1/2] phy/qualcomm: add hbr3_hbr2 voltage and premphasis swing table

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Date:   Wed, 17 Feb 2021 15:43:55 -0800
From:   Stephen Boyd <swboyd@...omium.org>
To:     Kuogee Hsieh <khsieh@...eaurora.org>, agross@...nel.org,
        bjorn.andersson@...aro.org, robdclark@...il.com, sean@...rly.run,
        vkoul@...nel.org
Cc:     tanmay@...eaurora.org, abhinavk@...eaurora.org,
        aravindh@...eaurora.org, khsieh@...eaurora.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] phy/qualcomm: add hbr3_hbr2 voltage and premphasis swing table

Quoting Kuogee Hsieh (2021-02-17 15:20:31)
> Add hbr3_hbr2 voltage and premphasis swing table to support
> HBR3 link rate.
> 
> Signed-off-by: Kuogee Hsieh <khsieh@...eaurora.org>
> ---
>  drivers/phy/qualcomm/phy-qcom-qmp.c | 23 +++++++++++++++++++++--
>  1 file changed, 21 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.c b/drivers/phy/qualcomm/phy-qcom-qmp.c
> index 0939a9e..c920143 100644
> --- a/drivers/phy/qualcomm/phy-qcom-qmp.c
> +++ b/drivers/phy/qualcomm/phy-qcom-qmp.c
> @@ -2965,6 +2965,20 @@ static void qcom_qmp_phy_dp_aux_init(struct qmp_phy *qphy)
>                qphy->pcs + QSERDES_V3_DP_PHY_AUX_INTERRUPT_MASK);
>  }
>  
> +static const u8 qmp_dp_v3_pre_emphasis_hbr3_hbr2[4][4] = {
> +        { 0x00, 0x0C, 0x15, 0x1A },
> +        { 0x02, 0x0E, 0x16, 0xFF },
> +        { 0x02, 0x11, 0xFF, 0xFF },
> +        { 0x04, 0xFF, 0xFF, 0xFF }

Lowercase hex please.

> +};
> +
> +static const u8 qmp_dp_v3_voltage_swing_hbr3_hbr2[4][4] = {
> +        { 0x02, 0x12, 0x16, 0x1A },
> +        { 0x09, 0x19, 0x1F, 0xFF },
> +        { 0x10, 0x1F, 0xFF, 0xFF },
> +        { 0x1F, 0xFF, 0xFF, 0xFF }
> +};

Lowercase hex please.

> +
>  static const u8 qmp_dp_v3_pre_emphasis_hbr_rbr[4][4] = {
>         { 0x00, 0x0c, 0x14, 0x19 },
>         { 0x00, 0x0b, 0x12, 0xff },
> @@ -3000,8 +3014,13 @@ static void qcom_qmp_phy_configure_dp_tx(struct qmp_phy *qphy)
>                 drvr_en = 0x10;
>         }
>  
> -       voltage_swing_cfg = qmp_dp_v3_voltage_swing_hbr_rbr[v_level][p_level];
> -       pre_emphasis_cfg = qmp_dp_v3_pre_emphasis_hbr_rbr[v_level][p_level];
> +       if (dp_opts->link_rate <= 2700) {
> +               voltage_swing_cfg = qmp_dp_v3_voltage_swing_hbr_rbr[v_level][p_level];
> +               pre_emphasis_cfg = qmp_dp_v3_pre_emphasis_hbr_rbr[v_level][p_level];
> +       } else {
> +               voltage_swing_cfg = qmp_dp_v3_voltage_swing_hbr3_hbr2[v_level][p_level];
> +               pre_emphasis_cfg = qmp_dp_v3_pre_emphasis_hbr3_hbr2[v_level][p_level];
> +       }
>