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Date: Fri, 22 Dec 2023 20:51:04 +0200
From: Abel Vesa <abel.vesa@linaro.org>
To: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Cc: Vinod Koul <vkoul@kernel.org>,
	Kishon Vijay Abraham I <kishon@kernel.org>,
	Bjorn Andersson <andersson@kernel.org>,
	Konrad Dybcio <konrad.dybcio@linaro.org>,
	Rob Herring <robh+dt@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Conor Dooley <conor+dt@kernel.org>, Johan Hovold <johan@kernel.org>,
	linux-phy@lists.infradead.org, linux-kernel@vger.kernel.org,
	linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org
Subject: Re: [PATCH v2 2/2] phy: qcom: edp: Add set_mode op for configuring
 eDP/DP submode
Message-ID: <ZYXamK7y2qbM/GaJ@linaro.org>
References: <20231222-x1e80100-phy-edp-compatible-refactor-v2-0-ab5786c2359f@linaro.org>
 <20231222-x1e80100-phy-edp-compatible-refactor-v2-2-ab5786c2359f@linaro.org>
 <CAA8EJpqPNzvA0yTqqSuXGHKxXoofJUQpAiHazoULru8A85YXHA@mail.gmail.com>
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On 23-12-22 16:45:47, Dmitry Baryshkov wrote:
> On Fri, 22 Dec 2023 at 15:01, Abel Vesa <abel.vesa@linaro.org> wrote:
> >
> > Future platforms should not use different compatibles to differentiate
> > between eDP and DP mode. Instead, they should use a single compatible as the
> > IP block is the same. It will be the job of the controller to set the submode
> > of the PHY accordingly. Rework the device match config data so that it only
> > keeps the different knobs rather than swing and pre-emphasis tables.
> >
> > The existing platforms will remain with separate compatibles for each mode.
> >
> > Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
> > ---
> >  drivers/phy/qualcomm/phy-qcom-edp.c | 90 ++++++++++++++++++++++++++++---------
> >  1 file changed, 69 insertions(+), 21 deletions(-)
> >
> > diff --git a/drivers/phy/qualcomm/phy-qcom-edp.c b/drivers/phy/qualcomm/phy-qcom-edp.c
> > index 8e5078304646..efd7015c73ec 100644
> > --- a/drivers/phy/qualcomm/phy-qcom-edp.c
> > +++ b/drivers/phy/qualcomm/phy-qcom-edp.c
> > @@ -14,6 +14,7 @@
> >  #include <linux/module.h>
> >  #include <linux/of.h>
> >  #include <linux/phy/phy.h>
> > +#include <linux/phy/phy-dp.h>
> >  #include <linux/platform_device.h>
> >  #include <linux/regulator/consumer.h>
> >  #include <linux/reset.h>
> > @@ -68,19 +69,21 @@
> >
> >  #define TXn_TRAN_DRVR_EMP_EN                    0x0078
> >
> > -struct qcom_edp_cfg {
> > -       bool is_dp;
> > -
> > -       /* DP PHY swing and pre_emphasis tables */
> > +struct qcom_edp_swing_pre_emph_cfg {
> >         const u8 (*swing_hbr_rbr)[4][4];
> >         const u8 (*swing_hbr3_hbr2)[4][4];
> >         const u8 (*pre_emphasis_hbr_rbr)[4][4];
> >         const u8 (*pre_emphasis_hbr3_hbr2)[4][4];
> >  };
> >
> > +struct qcom_edp_phy_cfg {
> > +       bool is_edp;
> > +       bool needs_swing_pre_emph_cfg;
> 
> I think something like needs_voltage_config sounds simpler and prettier.

Sure. Will do that in the next version.

> 
> > +};
> > +
> >  struct qcom_edp {
> >         struct device *dev;
> > -       const struct qcom_edp_cfg *cfg;
> > +       const struct qcom_edp_swing_pre_emph_cfg *swing_pre_emph_cfg;
> >
> >         struct phy *phy;
> >
> > @@ -96,6 +99,8 @@ struct qcom_edp {
> >
> >         struct clk_bulk_data clks[2];
> >         struct regulator_bulk_data supplies[2];
> > +
> > +       bool is_edp;
> >  };
> >
> >  static const u8 dp_swing_hbr_rbr[4][4] = {
> > @@ -126,8 +131,7 @@ static const u8 dp_pre_emp_hbr2_hbr3[4][4] = {
> >         { 0x04, 0xff, 0xff, 0xff }
> >  };
> >
> > -static const struct qcom_edp_cfg dp_phy_cfg = {
> > -       .is_dp = true,
> > +static const struct qcom_edp_swing_pre_emph_cfg dp_phy_swing_pre_emph_cfg = {
> >         .swing_hbr_rbr = &dp_swing_hbr_rbr,
> >         .swing_hbr3_hbr2 = &dp_swing_hbr2_hbr3,
> >         .pre_emphasis_hbr_rbr = &dp_pre_emp_hbr_rbr,
> > @@ -162,18 +166,29 @@ static const u8 edp_pre_emp_hbr2_hbr3[4][4] = {
> >         { 0x00, 0xff, 0xff, 0xff }
> >  };
> >
> > -static const struct qcom_edp_cfg edp_phy_cfg = {
> > -       .is_dp = false,
> > +static const struct qcom_edp_swing_pre_emph_cfg edp_phy_swing_pre_emph_cfg = {
> >         .swing_hbr_rbr = &edp_swing_hbr_rbr,
> >         .swing_hbr3_hbr2 = &edp_swing_hbr2_hbr3,
> >         .pre_emphasis_hbr_rbr = &edp_pre_emp_hbr_rbr,
> >         .pre_emphasis_hbr3_hbr2 = &edp_pre_emp_hbr2_hbr3,
> >  };
> >
> > +static struct qcom_edp_phy_cfg sc7280_dp_phy_cfg = {
> > +};
> > +
> > +static struct qcom_edp_phy_cfg sc8280xp_dp_phy_cfg = {
> > +       .needs_swing_pre_emph_cfg = true,
> > +};
> > +
> > +static struct qcom_edp_phy_cfg sc8280xp_edp_phy_cfg = {
> > +       .is_edp = true,
> > +       .needs_swing_pre_emph_cfg = true,
> > +};
> > +
> >  static int qcom_edp_phy_init(struct phy *phy)
> >  {
> >         struct qcom_edp *edp = phy_get_drvdata(phy);
> > -       const struct qcom_edp_cfg *cfg = edp->cfg;
> > +       const struct qcom_edp_swing_pre_emph_cfg *cfg = edp->swing_pre_emph_cfg;
> >         int ret;
> >         u8 cfg8;
> >
> > @@ -200,7 +215,7 @@ static int qcom_edp_phy_init(struct phy *phy)
> >                DP_PHY_PD_CTL_PLL_PWRDN | DP_PHY_PD_CTL_DP_CLAMP_EN,
> >                edp->edp + DP_PHY_PD_CTL);
> >
> > -       if (cfg && cfg->is_dp)
> > +       if (cfg && !edp->is_edp)
> >                 cfg8 = 0xb7;
> >         else
> >                 cfg8 = 0x37;
> > @@ -234,7 +249,7 @@ static int qcom_edp_phy_init(struct phy *phy)
> >
> >  static int qcom_edp_set_voltages(struct qcom_edp *edp, const struct phy_configure_opts_dp *dp_opts)
> >  {
> > -       const struct qcom_edp_cfg *cfg = edp->cfg;
> > +       const struct qcom_edp_swing_pre_emph_cfg *cfg = edp->swing_pre_emph_cfg;
> >         unsigned int v_level = 0;
> >         unsigned int p_level = 0;
> >         u8 ldo_config;
> > @@ -261,7 +276,7 @@ static int qcom_edp_set_voltages(struct qcom_edp *edp, const struct phy_configur
> >         if (swing == 0xff || emph == 0xff)
> >                 return -EINVAL;
> >
> > -       ldo_config = (cfg && cfg->is_dp) ? 0x1 : 0x0;
> > +       ldo_config = edp->is_edp ? 0x0 : 0x1;
> >
> >         writel(ldo_config, edp->tx0 + TXn_LDO_CONFIG);
> >         writel(swing, edp->tx0 + TXn_TX_DRV_LVL);
> > @@ -447,10 +462,10 @@ static int qcom_edp_set_vco_div(const struct qcom_edp *edp, unsigned long *pixel
> >  static int qcom_edp_phy_power_on(struct phy *phy)
> >  {
> >         const struct qcom_edp *edp = phy_get_drvdata(phy);
> > -       const struct qcom_edp_cfg *cfg = edp->cfg;
> > +       const struct qcom_edp_swing_pre_emph_cfg *cfg = edp->swing_pre_emph_cfg;
> >         u32 bias0_en, drvr0_en, bias1_en, drvr1_en;
> >         unsigned long pixel_freq;
> > -       u8 ldo_config;
> > +       u8 ldo_config = 0x0;
> >         int timeout;
> >         int ret;
> >         u32 val;
> > @@ -468,7 +483,8 @@ static int qcom_edp_phy_power_on(struct phy *phy)
> >                 return timeout;
> >
> >
> > -       ldo_config = (cfg && cfg->is_dp) ? 0x1 : 0x0;
> > +       if (cfg && !edp->is_edp)
> > +               ldo_config = 0x1;
> >
> >         writel(ldo_config, edp->tx0 + TXn_LDO_CONFIG);
> >         writel(ldo_config, edp->tx1 + TXn_LDO_CONFIG);
> > @@ -589,6 +605,31 @@ static int qcom_edp_phy_power_off(struct phy *phy)
> >         return 0;
> >  }
> >
> > +static int qcom_edp_phy_set_mode(struct phy *phy, enum phy_mode mode, int submode)
> > +{
> > +       struct qcom_edp *edp = phy_get_drvdata(phy);
> > +
> > +       if (mode != PHY_MODE_DP)
> > +               return -EINVAL;
> > +
> > +       switch (submode) {
> > +       case PHY_SUBMODE_DP:
> > +               edp->swing_pre_emph_cfg = &dp_phy_swing_pre_emph_cfg;
> > +               edp->is_edp = false;
> > +               break;
> > +
> > +       case PHY_SUBMODE_EDP:
> > +               edp->swing_pre_emph_cfg = &edp_phy_swing_pre_emph_cfg;
> 
> Won't this override the sc7280 config which doesn't set the
> .needs_swing_pre_emph_cfg?
> So even

Yeah, the way I thought about this would be that the controller won't
call phy_set_mode_ext if the node doesn't have is-edp property.

But I can see now that is sloppy. Will change this so if the legacy
platforms have the is_edp set in their device match data, it will just
check that the requested mode matches it.

> 
> > +               edp->is_edp = true;
> > +               break;
> > +
> > +       default:
> > +               return -EINVAL;
> > +       }
> > +
> > +       return 0;
> > +}
> > +
> >  static int qcom_edp_phy_exit(struct phy *phy)
> >  {
> >         struct qcom_edp *edp = phy_get_drvdata(phy);
> > @@ -604,6 +645,7 @@ static const struct phy_ops qcom_edp_ops = {
> >         .configure      = qcom_edp_phy_configure,
> >         .power_on       = qcom_edp_phy_power_on,
> >         .power_off      = qcom_edp_phy_power_off,
> > +       .set_mode       = qcom_edp_phy_set_mode,
> >         .exit           = qcom_edp_phy_exit,
> >         .owner          = THIS_MODULE,
> >  };
> > @@ -770,6 +812,7 @@ static int qcom_edp_clks_register(struct qcom_edp *edp, struct device_node *np)
> >
> >  static int qcom_edp_phy_probe(struct platform_device *pdev)
> >  {
> > +       const struct qcom_edp_phy_cfg *cfg = of_device_get_match_data(&pdev->dev);
> >         struct phy_provider *phy_provider;
> >         struct device *dev = &pdev->dev;
> >         struct qcom_edp *edp;
> > @@ -780,7 +823,12 @@ static int qcom_edp_phy_probe(struct platform_device *pdev)
> >                 return -ENOMEM;
> >
> >         edp->dev = dev;
> > -       edp->cfg = of_device_get_match_data(&pdev->dev);
> > +       edp->is_edp = cfg->is_edp;
> > +
> > +       if (cfg->needs_swing_pre_emph_cfg)
> > +               edp->swing_pre_emph_cfg = edp->is_edp ?
> > +                                               &edp_phy_swing_pre_emph_cfg :
> > +                                               &dp_phy_swing_pre_emph_cfg;
> >
> >         edp->edp = devm_platform_ioremap_resource(pdev, 0);
> >         if (IS_ERR(edp->edp))
> > @@ -839,10 +887,10 @@ static int qcom_edp_phy_probe(struct platform_device *pdev)
> >  }
> >
> >  static const struct of_device_id qcom_edp_phy_match_table[] = {
> > -       { .compatible = "qcom,sc7280-edp-phy" },
> > -       { .compatible = "qcom,sc8180x-edp-phy" },
> > -       { .compatible = "qcom,sc8280xp-dp-phy", .data = &dp_phy_cfg },
> > -       { .compatible = "qcom,sc8280xp-edp-phy", .data = &edp_phy_cfg },
> > +       { .compatible = "qcom,sc7280-edp-phy" , .data = &sc7280_dp_phy_cfg, },
> > +       { .compatible = "qcom,sc8180x-edp-phy", .data = &sc7280_dp_phy_cfg, },
> > +       { .compatible = "qcom,sc8280xp-dp-phy", .data = &sc8280xp_dp_phy_cfg, },
> > +       { .compatible = "qcom,sc8280xp-edp-phy", .data = &sc8280xp_edp_phy_cfg, },
> >         { }
> >  };
> >  MODULE_DEVICE_TABLE(of, qcom_edp_phy_match_table);
> >
> > --
> > 2.34.1
> >
> 
> 
> -- 
> With best wishes
> Dmitry