[PATCH v2 2/5] phy: qcom: edp: Introduce aux_cfg array for version specific aux settings

[Dmitry Baryshkov]

On Tue, 17 Sept 2024 at 10:40, Soutrik Mukhopadhyay
<quic_mukhopad at quicinc.com> wrote:
>
>
> On 9/13/2024 5:12 PM, Dmitry Baryshkov wrote:
> > On Fri, 13 Sept 2024 at 13:38, Soutrik Mukhopadhyay
> > <quic_mukhopad at quicinc.com> wrote:
> >> In order to support different HW versions, introduce aux_cfg array
> >> to move v4 specific aux configuration settings.
> >>
> >> Signed-off-by: Soutrik Mukhopadhyay <quic_mukhopad at quicinc.com>
> >> ---
> >> v2: Fixed review comments from Bjorn and Dmitry
> >>          - Made aux_cfg array as const.
> >>
> >> ---
> >>   drivers/phy/qualcomm/phy-qcom-edp.c | 37 ++++++++++++++++++-----------
> >>   1 file changed, 23 insertions(+), 14 deletions(-)
> >>
> >> diff --git a/drivers/phy/qualcomm/phy-qcom-edp.c b/drivers/phy/qualcomm/phy-qcom-edp.c
> >> index da2b32fb5b45..bcd5aced9e06 100644
> >> --- a/drivers/phy/qualcomm/phy-qcom-edp.c
> >> +++ b/drivers/phy/qualcomm/phy-qcom-edp.c
> >> @@ -90,6 +90,7 @@ struct phy_ver_ops {
> >>
> >>   struct qcom_edp_phy_cfg {
> >>          bool is_edp;
> >> +       const u8 *aux_cfg;
> >>          const struct qcom_edp_swing_pre_emph_cfg *swing_pre_emph_cfg;
> >>          const struct phy_ver_ops *ver_ops;
> >>   };
> >> @@ -186,11 +187,15 @@ static const struct qcom_edp_swing_pre_emph_cfg edp_phy_swing_pre_emph_cfg = {
> >>          .pre_emphasis_hbr3_hbr2 = &edp_pre_emp_hbr2_hbr3,
> >>   };
> >>
> >> +static const u8 edp_phy_aux_cfg_v4[10] = {
> >> +       0x00, 0x13, 0x24, 0x00, 0x0a, 0x26, 0x0a, 0x03, 0x37, 0x03
> >> +};
> >> +
> >>   static int qcom_edp_phy_init(struct phy *phy)
> >>   {
> >>          struct qcom_edp *edp = phy_get_drvdata(phy);
> >> +       u8 aux_cfg[10];
> > Please define 10, so that there are no magic numbers (and less chance
> > of damaging the stack if it gets changed in one place only.
>
>
> Sure, we will update this in the next version.
>
>
> >
> >>          int ret;
> >> -       u8 cfg8;
> >>
> >>          ret = regulator_bulk_enable(ARRAY_SIZE(edp->supplies), edp->supplies);
> >>          if (ret)
> >> @@ -200,6 +205,8 @@ static int qcom_edp_phy_init(struct phy *phy)
> >>          if (ret)
> >>                  goto out_disable_supplies;
> >>
> >> +       memcpy(aux_cfg, edp->cfg->aux_cfg, sizeof(aux_cfg));
> >> +
> >>          writel(DP_PHY_PD_CTL_PWRDN | DP_PHY_PD_CTL_AUX_PWRDN |
> >>                 DP_PHY_PD_CTL_PLL_PWRDN | DP_PHY_PD_CTL_DP_CLAMP_EN,
> >>                 edp->edp + DP_PHY_PD_CTL);
> >> @@ -222,22 +229,20 @@ static int qcom_edp_phy_init(struct phy *phy)
> >>           * even needed.
> >>           */
> >>          if (edp->cfg->swing_pre_emph_cfg && !edp->is_edp)
> >> -               cfg8 = 0xb7;
> >> -       else
> >> -               cfg8 = 0x37;
> >> +               aux_cfg[8] = 0xb7;
> >>
> >>          writel(0xfc, edp->edp + DP_PHY_MODE);
> >>
> >> -       writel(0x00, edp->edp + DP_PHY_AUX_CFG0);
> >> -       writel(0x13, edp->edp + DP_PHY_AUX_CFG1);
> >> -       writel(0x24, edp->edp + DP_PHY_AUX_CFG2);
> >> -       writel(0x00, edp->edp + DP_PHY_AUX_CFG3);
> >> -       writel(0x0a, edp->edp + DP_PHY_AUX_CFG4);
> >> -       writel(0x26, edp->edp + DP_PHY_AUX_CFG5);
> >> -       writel(0x0a, edp->edp + DP_PHY_AUX_CFG6);
> >> -       writel(0x03, edp->edp + DP_PHY_AUX_CFG7);
> >> -       writel(cfg8, edp->edp + DP_PHY_AUX_CFG8);
> >> -       writel(0x03, edp->edp + DP_PHY_AUX_CFG9);
> >> +       writel(aux_cfg[0], edp->edp + DP_PHY_AUX_CFG0);
> >> +       writel(aux_cfg[1], edp->edp + DP_PHY_AUX_CFG1);
> >> +       writel(aux_cfg[2], edp->edp + DP_PHY_AUX_CFG2);
> >> +       writel(aux_cfg[3], edp->edp + DP_PHY_AUX_CFG3);
> >> +       writel(aux_cfg[4], edp->edp + DP_PHY_AUX_CFG4);
> >> +       writel(aux_cfg[5], edp->edp + DP_PHY_AUX_CFG5);
> >> +       writel(aux_cfg[6], edp->edp + DP_PHY_AUX_CFG6);
> >> +       writel(aux_cfg[7], edp->edp + DP_PHY_AUX_CFG7);
> >> +       writel(aux_cfg[8], edp->edp + DP_PHY_AUX_CFG8);
> >> +       writel(aux_cfg[9], edp->edp + DP_PHY_AUX_CFG9);
> > Replace this with a loop?
>
>
> Can we use below approach for this :
>
> #define DP_PHY_AUX_CFG(n)        (0x24 + (0x04 * (n)))
>
> for (int i = 0; i < 10; i++)
>
>      writel(aux_cfg[i], edp->edp + DP_PHY_AUX_CFG(i));

That's what I meant, thank you!

>
>
> >
> >>          writel(PHY_AUX_STOP_ERR_MASK | PHY_AUX_DEC_ERR_MASK |
> >>                 PHY_AUX_SYNC_ERR_MASK | PHY_AUX_ALIGN_ERR_MASK |
> >> @@ -519,16 +524,19 @@ static const struct phy_ver_ops qcom_edp_phy_ops_v4 = {
> >>   };
> >>
> >>   static const struct qcom_edp_phy_cfg sc7280_dp_phy_cfg = {
> >> +       .aux_cfg = edp_phy_aux_cfg_v4,
> >>          .ver_ops = &qcom_edp_phy_ops_v4,
> >>   };
> >>
> >>   static const struct qcom_edp_phy_cfg sc8280xp_dp_phy_cfg = {
> >> +       .aux_cfg = edp_phy_aux_cfg_v4,
> >>          .swing_pre_emph_cfg = &dp_phy_swing_pre_emph_cfg,
> >>          .ver_ops = &qcom_edp_phy_ops_v4,
> >>   };
> >>
> >>   static const struct qcom_edp_phy_cfg sc8280xp_edp_phy_cfg = {
> >>          .is_edp = true,
> >> +       .aux_cfg = edp_phy_aux_cfg_v4,
> >>          .swing_pre_emph_cfg = &edp_phy_swing_pre_emph_cfg,
> >>          .ver_ops = &qcom_edp_phy_ops_v4,
> >>   };
> >> @@ -707,6 +715,7 @@ static const struct phy_ver_ops qcom_edp_phy_ops_v6 = {
> >>   };
> >>
> >>   static struct qcom_edp_phy_cfg x1e80100_phy_cfg = {
> >> +       .aux_cfg = edp_phy_aux_cfg_v4,
> >>          .swing_pre_emph_cfg = &dp_phy_swing_pre_emph_cfg,
> >>          .ver_ops = &qcom_edp_phy_ops_v6,
> >>   };
> >> --
> >> 2.17.1
> >>
> >



-- 
With best wishes
Dmitry