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Message-ID: <CAA8EJpqPNzvA0yTqqSuXGHKxXoofJUQpAiHazoULru8A85YXHA@mail.gmail.com>
Date: Fri, 22 Dec 2023 16:45:47 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Abel Vesa <abel.vesa@...aro.org>
Cc: Vinod Koul <vkoul@...nel.org>, Kishon Vijay Abraham I <kishon@...nel.org>,
Bjorn Andersson <andersson@...nel.org>, Konrad Dybcio <konrad.dybcio@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>,
Johan Hovold <johan@...nel.org>, linux-phy@...ts.infradead.org,
linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
devicetree@...r.kernel.org
Subject: Re: [PATCH v2 2/2] phy: qcom: edp: Add set_mode op for configuring
eDP/DP submode
On Fri, 22 Dec 2023 at 15:01, Abel Vesa <abel.vesa@...aro.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@...aro.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.
> +};
> +
> 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
> + 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
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