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Message-ID: <CAA8EJppeQTadmny=hcs4xCQDXHwXEBHXjeecvZCUVcSXmwBTgg@mail.gmail.com>
Date: Thu, 2 May 2024 16:12:20 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Udipto Goswami <quic_ugoswami@...cinc.com>
Cc: Bjorn Andersson <andersson@...nel.org>, Konrad Dybcio <konrad.dybcio@...aro.org>,
Vinod Koul <vkoul@...nel.org>, Kishon Vijay Abraham I <kishon@...nel.org>, linux-arm-msm@...r.kernel.org,
linux-phy@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] phy: qcom-snps-femto-v2: Add load and voltage setting for
LDO's used
On Thu, 2 May 2024 at 15:33, Udipto Goswami <quic_ugoswami@...cinc.com> wrote:
>
> The Femto phy depends on 0.88/ 1.8/ 3.3V regulators for its operation.
> If one of the regulators is not voted to the required minimum voltage
> for phy to operate, then High speed mode of operation will fail.
>
> On certain targets like (qcm6490_rb3gen2) where the minimum voltage
> of the regulator is lower than the operating voltage of the phy.
> If not voted properly, the phy supply would be limited to the min value
> of the LDO thereby rendering the phy non-operational.
>
> The current implementation of the regulators in the Femto PHY is not
> setting the load and voltage for each LDO. The appropriate voltages and
> loads required for the PHY to operate should be set.
Please move min/max voltages to the DTS. There is no need to set them
from the driver.
Also, is there any reason why you can't use `regulator-initial-mode =
<RPMH_REGULATOR_MODE_HPM>;` like other boards do?
>
> Implement a bulk operation api to set load & voltages before doing bulk
> enable. This will ensure that the PHY remains operational under all
> conditions.
>
> Signed-off-by: Udipto Goswami <quic_ugoswami@...cinc.com>
> ---
> drivers/phy/qualcomm/phy-qcom-snps-femto-v2.c | 121 +++++++++++++++++-
> 1 file changed, 114 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/phy/qualcomm/phy-qcom-snps-femto-v2.c b/drivers/phy/qualcomm/phy-qcom-snps-femto-v2.c
> index eb0b0f61d98e..cbe9cdaa6849 100644
> --- a/drivers/phy/qualcomm/phy-qcom-snps-femto-v2.c
> +++ b/drivers/phy/qualcomm/phy-qcom-snps-femto-v2.c
> @@ -78,11 +78,39 @@
>
> #define LS_FS_OUTPUT_IMPEDANCE_MASK GENMASK(3, 0)
>
> -static const char * const qcom_snps_hsphy_vreg_names[] = {
> - "vdda-pll", "vdda33", "vdda18",
> +
> +struct qcom_snps_hsphy_regulator_data {
> + const char *name;
> + unsigned int enable_load;
> + unsigned int min_voltage;
> + unsigned int max_voltage;
> +};
> +
> +static const struct qcom_snps_hsphy_regulator_data hsphy_vreg_l[] = {
> + {
> + .name = "vdda-pll",
> + .enable_load = 30000,
> + .min_voltage = 825000,
> + .max_voltage = 925000,
> + },
> +
> + {
> + .name = "vdda18",
> + .enable_load = 19000,
> + .min_voltage = 1704000,
> + .max_voltage = 1800000
> + },
> +
> + {
> + .name = "vdda33",
> + .enable_load = 16000,
> + .min_voltage = 3050000,
> + .max_voltage = 3300000
> + },
> +
> };
>
> -#define SNPS_HS_NUM_VREGS ARRAY_SIZE(qcom_snps_hsphy_vreg_names)
> +#define SNPS_HS_NUM_VREGS ARRAY_SIZE(hsphy_vreg_l)
>
> struct override_param {
> s32 value;
> @@ -132,12 +160,90 @@ struct qcom_snps_hsphy {
> struct clk_bulk_data *clks;
> struct reset_control *phy_reset;
> struct regulator_bulk_data vregs[SNPS_HS_NUM_VREGS];
> + const struct qcom_snps_hsphy_regulator_data *vreg_list;
>
> bool phy_initialized;
> enum phy_mode mode;
> struct phy_override_seq update_seq_cfg[NUM_HSPHY_TUNING_PARAMS];
> };
>
> +static int __vdda_phy_bulk_enable_disable(struct qcom_snps_hsphy *hsphy, bool on)
Separate functions, please.
> +{
> + int ret = 0;
> + int i;
> +
> + if (!on)
> + goto disable_vdd;
> +
> + for (i = 0; i < SNPS_HS_NUM_VREGS; i++) {
> +
> + ret = regulator_set_load(hsphy->vregs[i].consumer,
> + hsphy->vreg_list[i].enable_load);
> +
> + if (ret < 0) {
> + dev_err(hsphy->dev, "unable to set HPM of %s %d\n",
> + hsphy->vregs[i].supply, ret);
> + goto err_vdd;
> + }
> + }
> +
> + for (i = 0; i < SNPS_HS_NUM_VREGS; i++) {
> + ret = regulator_set_voltage(hsphy->vregs[i].consumer,
> + hsphy->vreg_list[i].min_voltage,
> + hsphy->vreg_list[i].max_voltage);
> + if (ret) {
> + dev_err(hsphy->dev,
> + "unable to set voltage of regulator %s %d\n",
> + hsphy->vregs[i].supply, ret);
> + goto put_vdd_lpm;
> + }
> + }
> +
> + ret = regulator_bulk_enable(ARRAY_SIZE(hsphy->vregs), hsphy->vregs);
> + if (ret)
> + goto unconfig_vdd;
> +
> + return ret;
> +
> +disable_vdd:
> + regulator_bulk_disable(ARRAY_SIZE(hsphy->vregs), hsphy->vregs);
> +
> +unconfig_vdd:
> + for (i = 0; i < SNPS_HS_NUM_VREGS; i++) {
> + ret = regulator_set_voltage(hsphy->vregs[i].consumer, 0,
> + hsphy->vreg_list[i].max_voltage);
> + if (ret) {
> + dev_err(hsphy->dev,
> + "unable to set voltage of regulator %s %d\n",
> + hsphy->vregs[i].supply, ret);
> + }
> + }
> +
> +put_vdd_lpm:
> + for (i = 0; i < SNPS_HS_NUM_VREGS; i++) {
> + ret = regulator_set_load(hsphy->vregs[i].consumer, 0);
> +
> + if (ret < 0) {
> + dev_err(hsphy->dev, "unable to set LPM of %s %d\n",
> + hsphy->vregs[i].supply, ret);
> + }
> + }
> +
> +err_vdd:
> + return ret;
> +
> +}
> +
> +static int vdda_phy_bulk_enable(struct qcom_snps_hsphy *hsphy)
> +{
> + return __vdda_phy_bulk_enable_disable(hsphy, true);
> +}
> +
> +static int vdda_phy_bulk_disable(struct qcom_snps_hsphy *hsphy)
> +{
> + return __vdda_phy_bulk_enable_disable(hsphy, false);
> +}
> +
> static int qcom_snps_hsphy_clk_init(struct qcom_snps_hsphy *hsphy)
> {
> struct device *dev = hsphy->dev;
> @@ -390,7 +496,7 @@ static int qcom_snps_hsphy_init(struct phy *phy)
>
> dev_vdbg(&phy->dev, "%s(): Initializing SNPS HS phy\n", __func__);
>
> - ret = regulator_bulk_enable(ARRAY_SIZE(hsphy->vregs), hsphy->vregs);
> + ret = vdda_phy_bulk_enable(hsphy);
> if (ret)
> return ret;
>
> @@ -471,7 +577,7 @@ static int qcom_snps_hsphy_init(struct phy *phy)
> disable_clks:
> clk_bulk_disable_unprepare(hsphy->num_clks, hsphy->clks);
> poweroff_phy:
> - regulator_bulk_disable(ARRAY_SIZE(hsphy->vregs), hsphy->vregs);
> + ret = vdda_phy_bulk_disable(hsphy);
>
> return ret;
> }
> @@ -482,7 +588,7 @@ static int qcom_snps_hsphy_exit(struct phy *phy)
>
> reset_control_assert(hsphy->phy_reset);
> clk_bulk_disable_unprepare(hsphy->num_clks, hsphy->clks);
> - regulator_bulk_disable(ARRAY_SIZE(hsphy->vregs), hsphy->vregs);
> + vdda_phy_bulk_disable(hsphy);
> hsphy->phy_initialized = false;
>
> return 0;
> @@ -592,8 +698,9 @@ static int qcom_snps_hsphy_probe(struct platform_device *pdev)
>
> num = ARRAY_SIZE(hsphy->vregs);
> for (i = 0; i < num; i++)
> - hsphy->vregs[i].supply = qcom_snps_hsphy_vreg_names[i];
> + hsphy->vregs[i].supply = hsphy_vreg_l[i].name;
>
> + hsphy->vreg_list = hsphy_vreg_l;
> ret = devm_regulator_bulk_get(dev, num, hsphy->vregs);
> if (ret)
> return dev_err_probe(dev, ret,
> --
> 2.17.1
>
>
--
With best wishes
Dmitry
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