linux-kernel - Re: [PATCH v2] clk: qcom: lpasscc: Re-configure the PLL in case lost

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Message-ID: <160269519265.884498.6320532206038624483@swboyd.mtv.corp.google.com>
Date:   Wed, 14 Oct 2020 10:06:32 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Douglas Anderson <dianders@...omium.org>
Cc:     David Brown <david.brown@...aro.org>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        linux-soc@...r.kernel.org, Taniya Das <tdas@...eaurora.org>,
        Douglas Anderson <dianders@...omium.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] clk: qcom: lpasscc: Re-configure the PLL in case lost

Quoting Douglas Anderson (2020-10-14 08:58:24)
> diff --git a/drivers/clk/qcom/lpasscorecc-sc7180.c b/drivers/clk/qcom/lpasscorecc-sc7180.c
> index 228d08f5d26f..ee23eb5b9bf2 100644
> --- a/drivers/clk/qcom/lpasscorecc-sc7180.c
> +++ b/drivers/clk/qcom/lpasscorecc-sc7180.c
> @@ -356,6 +356,25 @@ static const struct qcom_cc_desc lpass_audio_hm_sc7180_desc = {
>         .num_gdscs = ARRAY_SIZE(lpass_audio_hm_sc7180_gdscs),
>  };
>  
> +static int lpass_core_cc_pm_clk_resume(struct device *dev)
> +{
> +       struct regmap *regmap = dev_get_drvdata(dev);

Can we use dev_get_remap(dev, NULL) instead?

> +       unsigned int l_val;
> +       int ret;
> +
> +       ret = pm_clk_resume(dev);
> +       if (ret)
> +               return ret;
> +
> +       /* Read PLL_L_VAL */

Please drop this useless comment. Replace it with something like this
(if at all):

	/* Reconfigure PLL if PLL was reset across suspend */

> +       regmap_read(regmap, 0x1004, &l_val);
> +       if (!l_val)
> +               clk_fabia_pll_configure(&lpass_lpaaudio_dig_pll, regmap,
> +                               &lpass_lpaaudio_dig_pll_config);
> +
> +       return 0;
> +}
> +
>  static int lpass_core_cc_sc7180_probe(struct platform_device *pdev)
>  {
>         const struct qcom_cc_desc *desc;
> @@ -373,6 +392,8 @@ static int lpass_core_cc_sc7180_probe(struct platform_device *pdev)
>         if (IS_ERR(regmap))
>                 return PTR_ERR(regmap);
>  
> +       dev_set_drvdata(&pdev->dev, regmap);
> +

And then this isn't needed.

>         /*
>          * Keep the CLK always-ON
>          * LPASS_AUDIO_CORE_SYSNOC_SWAY_CORE_CLK