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Message-ID: <v6jzz6q5eutbmdy6vwagdhenjnvxucf3u3nl5qdjte65wlc77e@tzvxcm3xnuht>
Date: Sat, 7 Sep 2024 22:19:42 -0500
From: Bjorn Andersson <andersson@...nel.org>
To: Abel Vesa <abel.vesa@...aro.org>
Cc: Vinod Koul <vkoul@...nel.org>,
Kishon Vijay Abraham I <kishon@...nel.org>, Johan Hovold <johan@...nel.org>,
Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] phy: qcom: edp: Add runtime PM support
On Sat, Sep 07, 2024 at 06:25:21PM GMT, Abel Vesa wrote:
> Enable runtime PM support by adding proper ops which will handle the
> clocks and regulators. These resources will now be handled on power_on and
> power_off instead of init and exit PHY ops. Also enable these resources on
> probe in order to balance out the disabling that is happening right after.
Sounds good, I assume there's a good reason for doing this?
Please provide a proper problem description, as defined in:
https://docs.kernel.org/process/submitting-patches.html#describe-your-changes
> Prevent runtime PM from being ON by default as well.
>
Why?
> Signed-off-by: Abel Vesa <abel.vesa@...aro.org>
> ---
> drivers/phy/qualcomm/phy-qcom-edp.c | 105 ++++++++++++++++++++++++++----------
> 1 file changed, 77 insertions(+), 28 deletions(-)
>
> diff --git a/drivers/phy/qualcomm/phy-qcom-edp.c b/drivers/phy/qualcomm/phy-qcom-edp.c
> index da2b32fb5b45..3affeef261bf 100644
> --- a/drivers/phy/qualcomm/phy-qcom-edp.c
> +++ b/drivers/phy/qualcomm/phy-qcom-edp.c
> @@ -192,14 +192,6 @@ static int qcom_edp_phy_init(struct phy *phy)
> int ret;
> u8 cfg8;
>
> - ret = regulator_bulk_enable(ARRAY_SIZE(edp->supplies), edp->supplies);
> - if (ret)
> - return ret;
> -
> - ret = clk_bulk_prepare_enable(ARRAY_SIZE(edp->clks), edp->clks);
> - if (ret)
> - goto out_disable_supplies;
> -
> 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);
> @@ -246,11 +238,6 @@ static int qcom_edp_phy_init(struct phy *phy)
> msleep(20);
>
> return 0;
> -
> -out_disable_supplies:
> - regulator_bulk_disable(ARRAY_SIZE(edp->supplies), edp->supplies);
> -
> - return ret;
> }
>
> static int qcom_edp_set_voltages(struct qcom_edp *edp, const struct phy_configure_opts_dp *dp_opts)
> @@ -721,6 +708,8 @@ static int qcom_edp_phy_power_on(struct phy *phy)
> u32 val;
> u8 cfg1;
>
> + pm_runtime_get_sync(&phy->dev);
> +
> ret = edp->cfg->ver_ops->com_power_on(edp);
> if (ret)
> return ret;
> @@ -841,6 +830,8 @@ static int qcom_edp_phy_power_off(struct phy *phy)
>
> writel(DP_PHY_PD_CTL_PSR_PWRDN, edp->edp + DP_PHY_PD_CTL);
>
> + pm_runtime_put(&phy->dev);
> +
> return 0;
> }
>
> @@ -856,23 +847,12 @@ static int qcom_edp_phy_set_mode(struct phy *phy, enum phy_mode mode, int submod
> return 0;
> }
>
> -static int qcom_edp_phy_exit(struct phy *phy)
> -{
> - struct qcom_edp *edp = phy_get_drvdata(phy);
> -
> - clk_bulk_disable_unprepare(ARRAY_SIZE(edp->clks), edp->clks);
> - regulator_bulk_disable(ARRAY_SIZE(edp->supplies), edp->supplies);
> -
> - return 0;
> -}
> -
> static const struct phy_ops qcom_edp_ops = {
> .init = qcom_edp_phy_init,
> .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,
> };
>
> @@ -1036,6 +1016,32 @@ static int qcom_edp_clks_register(struct qcom_edp *edp, struct device_node *np)
> return devm_of_clk_add_hw_provider(edp->dev, of_clk_hw_onecell_get, data);
> }
>
> +static int __maybe_unused qcom_edp_runtime_suspend(struct device *dev)
> +{
> + struct qcom_edp *edp = dev_get_drvdata(dev);
> +
> + dev_err(dev, "Suspending DP phy\n");
> +
> + clk_bulk_disable_unprepare(ARRAY_SIZE(edp->clks), edp->clks);
> + regulator_bulk_disable(ARRAY_SIZE(edp->supplies), edp->supplies);
> +
> + return 0;
> +}
> +
> +static int __maybe_unused qcom_edp_runtime_resume(struct device *dev)
> +{
> + struct qcom_edp *edp = dev_get_drvdata(dev);
> + int ret;
> +
> + dev_err(dev, "Resuming DP phy\n");
> +
> + ret = regulator_bulk_enable(ARRAY_SIZE(edp->supplies), edp->supplies);
> + if (ret)
> + return ret;
> +
> + return clk_bulk_prepare_enable(ARRAY_SIZE(edp->clks), edp->clks);
> +}
> +
> static int qcom_edp_phy_probe(struct platform_device *pdev)
> {
> struct phy_provider *phy_provider;
> @@ -1091,20 +1097,57 @@ static int qcom_edp_phy_probe(struct platform_device *pdev)
> return ret;
> }
>
> - ret = qcom_edp_clks_register(edp, pdev->dev.of_node);
> - if (ret)
> + ret = regulator_bulk_enable(ARRAY_SIZE(edp->supplies), edp->supplies);
> + if (ret) {
> + dev_err(dev, "failed to enable regulators, err=%d\n", ret);
> return ret;
> + }
> +
> + ret = clk_bulk_prepare_enable(ARRAY_SIZE(edp->clks), edp->clks);
> + if (ret) {
> + dev_err(dev, "failed to enable clocks, err=%d\n", ret);
> + goto err_disable_regulators;
> + }
> +
> + ret = qcom_edp_clks_register(edp, pdev->dev.of_node);
> + if (ret) {
> + dev_err(dev, "failed to register PHY clocks, err=%d\n", ret);
> + goto err_disable_clocks;
> + }
>
> edp->phy = devm_phy_create(dev, pdev->dev.of_node, &qcom_edp_ops);
> if (IS_ERR(edp->phy)) {
> dev_err(dev, "failed to register phy\n");
> - return PTR_ERR(edp->phy);
> + ret = PTR_ERR(edp->phy);
> + goto err_disable_clocks;
> }
>
> + pm_runtime_set_active(dev);
> + ret = devm_pm_runtime_enable(dev);
> + if (ret)
> + goto err_disable_clocks;
> + /*
> + * Prevent runtime pm from being ON by default. Users can enable
> + * it using power/control in sysfs.
That is what this call do, please describe why it's done instead.
Regards,
Bjorn
> + */
> + pm_runtime_forbid(dev);
> +
> + dev_set_drvdata(dev, edp);
> phy_set_drvdata(edp->phy, edp);
>
> phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
> - return PTR_ERR_OR_ZERO(phy_provider);
> + if (IS_ERR(phy_provider))
> + goto err_disable_clocks;
> +
> + return 0;
> +
> +err_disable_clocks:
> + clk_bulk_disable_unprepare(ARRAY_SIZE(edp->clks), edp->clks);
> +
> +err_disable_regulators:
> + regulator_bulk_disable(ARRAY_SIZE(edp->supplies), edp->supplies);
> +
> + return ret;
> }
>
> static const struct of_device_id qcom_edp_phy_match_table[] = {
> @@ -1117,10 +1160,16 @@ static const struct of_device_id qcom_edp_phy_match_table[] = {
> };
> MODULE_DEVICE_TABLE(of, qcom_edp_phy_match_table);
>
> +static const struct dev_pm_ops qcom_edp_pm_ops = {
> + SET_RUNTIME_PM_OPS(qcom_edp_runtime_suspend,
> + qcom_edp_runtime_resume, NULL)
> +};
> +
> static struct platform_driver qcom_edp_phy_driver = {
> .probe = qcom_edp_phy_probe,
> .driver = {
> .name = "qcom-edp-phy",
> + .pm = &qcom_edp_pm_ops,
> .of_match_table = qcom_edp_phy_match_table,
> },
> };
>
> ---
> base-commit: 9aaeb87ce1e966169a57f53a02ba05b30880ffb8
> change-id: 20240907-phy-qcom-edp-enable-runtime-pm-6fad07af8947
>
> Best regards,
> --
> Abel Vesa <abel.vesa@...aro.org>
>
>
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