[PATCH 2/5] thermal: exynos: Fix first temperature read after registering sensor

[Alim Akhtar]

Hello,

On Thu, Oct 8, 2015 at 11:04 AM, Krzysztof Kozlowski
<k.kozlowski at samsung.com> wrote:
> Thermal core could not read the temperature after registering the
> thermal sensor with thermal_zone_of_sensor_register() because the driver
> was not yet initialized.
>
> The call trace looked like:
>     exynos_tmu_probe()
>         thermal_zone_of_sensor_register()
>             of_thermal_set_mode()
>                 thermal_zone_device_update()
>                     exynos_get_temp()
>                         if (!data->tmu_read) return -EINVAL;
>         exynos_map_dt_data()
>             data->tmu_read = ...
>
> This produced an error in dmesg:
> thermal thermal_zone0: failed to read out thermal zone (-22)
>
> Register the thermal_zone_device later, after parsing Device Tree and
> enabling necessary clocks, but before calling exynos_tmu_initialize()
> which uses the registered thermal_zone_device.
>
> Signed-off-by: Krzysztof Kozlowski <k.kozlowski at samsung.com>
> Fixes: 3b6a1a805f34 ("thermal: samsung: core: Exynos TMU rework to use device tree for configuration")
> ---
Patch looks good to me.

Before this patch I was getting below on exynos5800 board:
[    2.648629] thermal thermal_zone0: failed to read out thermal zone (-22)
[    2.653906] 10060000.tmu supply vtmu not found, using dummy regulator
[    2.660521] thermal thermal_zone1: failed to read out thermal zone (-22)
[    2.666985] 10064000.tmu supply vtmu not found, using dummy regulator
[    2.673658] thermal thermal_zone2: failed to read out thermal zone (-22)
[    2.680093] 10068000.tmu supply vtmu not found, using dummy regulator
[    2.686901] thermal thermal_zone3: failed to read out thermal zone (-22)
[    2.693187] 1006c000.tmu supply vtmu not found, using dummy regulator
[    2.699914] thermal thermal_zone4: failed to read out thermal zone (-22)
[    2.706332] 100a0000.tmu supply vtmu not found, using dummy regulator


Reviewed-by: Alim Akhtar <alim.akhtar at samsung.com>

Tested on exynos5800 peach board, so
Tested-by: Alim Akhtar <alim.akhtar at samsung.com>


>  drivers/thermal/samsung/exynos_tmu.c | 27 +++++++++++++++++--------
--
>  1 file changed, 17 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c
> index 23f4320f8ef7..bc71a61f0c4a 100644
> --- a/drivers/thermal/samsung/exynos_tmu.c
> +++ b/drivers/thermal/samsung/exynos_tmu.c
> @@ -1289,13 +1289,6 @@ static int exynos_tmu_probe(struct platform_device *pdev)
>         platform_set_drvdata(pdev, data);
>         mutex_init(&data->lock);
>
> -       data->tzd = thermal_zone_of_sensor_register(&pdev->dev, 0, data,
> -                                                   &exynos_sensor_ops);
> -       if (IS_ERR(data->tzd)) {
> -               pr_err("thermal: tz: %p ERROR\n", data->tzd);
> -               return PTR_ERR(data->tzd);
> -       }
> -
>         /*
>          * Try enabling the regulator if found
>          * TODO: Add regulator as an SOC feature, so that regulator enable
> @@ -1365,21 +1358,36 @@ static int exynos_tmu_probe(struct platform_device *pdev)
>                 break;
>         };
>
> +       /*
> +        * data->tzd must be registered before calling exynos_tmu_initialize(),
> +        * requesting irq and calling exynos_tmu_control().
> +        */
> +       data->tzd = thermal_zone_of_sensor_register(&pdev->dev, 0, data,
> +                                                   &exynos_sensor_ops);
> +       if (IS_ERR(data->tzd)) {
> +               ret = PTR_ERR(data->tzd);
> +               dev_err(&pdev->dev, "Failed to register sensor: %d\n", ret);
> +               goto err_sclk;
> +       }
> +
>         ret = exynos_tmu_initialize(pdev);
>         if (ret) {
>                 dev_err(&pdev->dev, "Failed to initialize TMU\n");
> -               goto err_sclk;
> +               goto err_thermal;
>         }
>
>         ret = devm_request_irq(&pdev->dev, data->irq, exynos_tmu_irq,
>                 IRQF_TRIGGER_RISING | IRQF_SHARED, dev_name(&pdev->dev), data);
>         if (ret) {
>                 dev_err(&pdev->dev, "Failed to request irq: %d\n", data->irq);
> -               goto err_sclk;
> +               goto err_thermal;
>         }
>
>         exynos_tmu_control(pdev, true);
>         return 0;
> +
> +err_thermal:
> +       thermal_zone_of_sensor_unregister(&pdev->dev, data->tzd);
>  err_sclk:
>         clk_disable_unprepare(data->sclk);
>  err_clk:
> @@ -1390,7 +1398,6 @@ err_clk_sec:
>  err_sensor:
>         if (!IS_ERR_OR_NULL(data->regulator))
>                 regulator_disable(data->regulator);
> -       thermal_zone_of_sensor_unregister(&pdev->dev, data->tzd);
>
>         return ret;
>  }
> --
> 1.9.1
>
>
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-- 
Regards,
Alim