linux-kernel - Re: [PATCH v3 09/17] mmc: sdhci-msm: Fix error handling for dev_pm_opp_of_add

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Date:   Tue, 28 Apr 2020 20:29:38 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Rajendra Nayak <rnayak@...eaurora.org>
Cc:     Viresh Kumar <viresh.kumar@...aro.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Andy Gross <agross@...nel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        DTML <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        Pradeep P V K <ppvk@...eaurora.org>,
        Veerabhadrarao Badiganti <vbadigan@...eaurora.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>
Subject: Re: [PATCH v3 09/17] mmc: sdhci-msm: Fix error handling for dev_pm_opp_of_add_table()

On Tue, 28 Apr 2020 at 15:39, Rajendra Nayak <rnayak@...eaurora.org> wrote:
>
> Even though specifying OPP's in device tree is optional, ignoring all errors
> reported by dev_pm_opp_of_add_table() means we can't distinguish between a
> missing OPP table and a wrong/buggy OPP table. While missing OPP table
> (dev_pm_opp_of_add_table() returns a -ENODEV in such case) can be ignored,
> a wrong/buggy OPP table in device tree should make the driver error out.
>
> while we fix that, lets also fix the variable names for opp/opp_table to
> avoid confusion and name them opp_table/has_opp_table instead.
>
> Suggested-by: Matthias Kaehlcke <matthias@...omium.org>
> Signed-off-by: Rajendra Nayak <rnayak@...eaurora.org>
> Cc: Ulf Hansson <ulf.hansson@...aro.org>
> Cc: Pradeep P V K <ppvk@...eaurora.org>
> Cc: Veerabhadrarao Badiganti <vbadigan@...eaurora.org>
> Cc: linux-mmc@...r.kernel.org

Is this a standalone patch that I queue up via my mmc tree?

Kind regards
Uffe

> ---
>  drivers/mmc/host/sdhci-msm.c | 27 ++++++++++++++++-----------
>  1 file changed, 16 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
> index 8a055dd..97758fa 100644
> --- a/drivers/mmc/host/sdhci-msm.c
> +++ b/drivers/mmc/host/sdhci-msm.c
> @@ -244,8 +244,8 @@ struct sdhci_msm_host {
>         struct clk_bulk_data bulk_clks[4]; /* core, iface, cal, sleep clocks */
>         unsigned long clk_rate;
>         struct mmc_host *mmc;
> -       struct opp_table *opp;
> -       bool opp_table;
> +       struct opp_table *opp_table;
> +       bool has_opp_table;
>         bool use_14lpp_dll_reset;
>         bool tuning_done;
>         bool calibration_done;
> @@ -1967,15 +1967,20 @@ static int sdhci_msm_probe(struct platform_device *pdev)
>         }
>         msm_host->bulk_clks[0].clk = clk;
>
> -       msm_host->opp = dev_pm_opp_set_clkname(&pdev->dev, "core");
> -       if (IS_ERR(msm_host->opp)) {
> -               ret = PTR_ERR(msm_host->opp);
> +       msm_host->opp_table = dev_pm_opp_set_clkname(&pdev->dev, "core");
> +       if (IS_ERR(msm_host->opp_table)) {
> +               ret = PTR_ERR(msm_host->opp_table);
>                 goto bus_clk_disable;
>         }
>
>         /* OPP table is optional */
> -       if (!dev_pm_opp_of_add_table(&pdev->dev))
> -               msm_host->opp_table = true;
> +       ret = dev_pm_opp_of_add_table(&pdev->dev);
> +       if (!ret) {
> +               msm_host->has_opp_table = true;
> +       } else if (ret != -ENODEV) {
> +               dev_err(&pdev->dev, "Invalid OPP table in Device tree\n");
> +               goto opp_cleanup;
> +       }
>
>         /* Vote for maximum clock rate for maximum performance */
>         ret = dev_pm_opp_set_rate(&pdev->dev, INT_MAX);
> @@ -2133,9 +2138,9 @@ static int sdhci_msm_probe(struct platform_device *pdev)
>         clk_bulk_disable_unprepare(ARRAY_SIZE(msm_host->bulk_clks),
>                                    msm_host->bulk_clks);
>  opp_cleanup:
> -       if (msm_host->opp_table)
> +       if (msm_host->has_opp_table)
>                 dev_pm_opp_of_remove_table(&pdev->dev);
> -       dev_pm_opp_put_clkname(msm_host->opp);
> +       dev_pm_opp_put_clkname(msm_host->opp_table);
>  bus_clk_disable:
>         if (!IS_ERR(msm_host->bus_clk))
>                 clk_disable_unprepare(msm_host->bus_clk);
> @@ -2154,9 +2159,9 @@ static int sdhci_msm_remove(struct platform_device *pdev)
>
>         sdhci_remove_host(host, dead);
>
> -       if (msm_host->opp_table)
> +       if (msm_host->has_opp_table)
>                 dev_pm_opp_of_remove_table(&pdev->dev);
> -       dev_pm_opp_put_clkname(msm_host->opp);
> +       dev_pm_opp_put_clkname(msm_host->opp_table);
>         pm_runtime_get_sync(&pdev->dev);
>         pm_runtime_disable(&pdev->dev);
>         pm_runtime_put_noidle(&pdev->dev);
> --
> QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
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