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From: Vasily Khoruzhick <anarsoul@gmail.com>
To: Yangtao Li <tiny.windzz@gmail.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
	devicetree <devicetree@vger.kernel.org>,
	Linux PM <linux-pm@vger.kernel.org>,
	Maxime Ripard <maxime.ripard@bootlin.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Daniel Lezcano <daniel.lezcano@linaro.org>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	Eduardo Valentin <edubezval@gmail.com>,
	Chen-Yu Tsai <wens@csie.org>, Rob Herring <robh+dt@kernel.org>,
	Jonathan.Cameron@huawei.com,
	Mauro Carvalho Chehab <mchehab+samsung@kernel.org>,
	rui.zhang@intel.com, "David S. Miller" <davem@davemloft.net>,
	arm-linux <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v5 08/18] thermal: sun8i: support mod clocks
Date: Fri, 9 Aug 2019 23:16:48 -0700	[thread overview]
Message-ID: <CA+E=qVfp-rProxOwX__J6jM-pZ9g_SmeuOCOgvC_5DJVQw4OGw@mail.gmail.com> (raw)
In-Reply-To: <20190810052829.6032-9-tiny.windzz@gmail.com>

On Fri, Aug 9, 2019 at 10:31 PM Yangtao Li <tiny.windzz@gmail.com> wrote:
>
> H3 has extra clock, so introduce something in ths_thermal_chip/ths_device
> and adds the process of the clock.
>
> This is pre-work for supprt it.
>
> Signed-off-by: Yangtao Li <tiny.windzz@gmail.com>
> ---
>  drivers/thermal/sun8i_thermal.c | 17 ++++++++++++++++-
>  1 file changed, 16 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/thermal/sun8i_thermal.c b/drivers/thermal/sun8i_thermal.c
> index b934bc81eba7..6f4294c2aba7 100644
> --- a/drivers/thermal/sun8i_thermal.c
> +++ b/drivers/thermal/sun8i_thermal.c
> @@ -54,6 +54,7 @@ struct tsensor {
>  };
>
>  struct ths_thermal_chip {
> +       bool            has_mod_clk;
>         int             sensor_num;
>         int             offset;
>         int             scale;
> @@ -69,6 +70,7 @@ struct ths_device {
>         struct regmap                           *regmap;
>         struct reset_control                    *reset;
>         struct clk                              *bus_clk;
> +       struct clk                              *mod_clk;
>         struct tsensor                          sensor[MAX_SENSOR_NUM];
>  };
>
> @@ -274,6 +276,12 @@ static int sun8i_ths_resource_init(struct ths_device *tmdev)
>         if (IS_ERR(tmdev->bus_clk))
>                 return PTR_ERR(tmdev->bus_clk);
>
> +       if (tmdev->chip->has_mod_clk) {
> +               tmdev->mod_clk = devm_clk_get(&pdev->dev, "mod");
> +               if (IS_ERR(tmdev->mod_clk))
> +                       return PTR_ERR(tmdev->mod_clk);
> +       }
> +
>         ret = reset_control_deassert(tmdev->reset);
>         if (ret)
>                 return ret;
> @@ -282,12 +290,18 @@ static int sun8i_ths_resource_init(struct ths_device *tmdev)
>         if (ret)
>                 goto assert_reset;
>
> -       ret = sun50i_ths_calibrate(tmdev);
> +       ret = clk_prepare_enable(tmdev->mod_clk);

You have to set rate of modclk before enabling it since you can't rely
on whatever bootloader left for you.

Also I found that parameters you're using for PC_TEMP_PERIOD, ACQ0 and
ACQ1 are too aggressive and may result in high interrupt rate to the
point when it may stall RCU. I changed driver a bit to use params from
Philipp Rossak's work (modclk set to 4MHz, PC_TEMP_PERIOD is 7, ACQ0
is 255, ACQ1 is 63) and it fixed RCU stalls for me, see [1] for
details.

[1] https://github.com/anarsoul/linux-2.6/commit/46b8bb0fe2ccd1cd88fa9181a2ecbf79e8d513b2


>         if (ret)
>                 goto bus_disable;
>
> +       ret = sun50i_ths_calibrate(tmdev);
> +       if (ret)
> +               goto mod_disable;
> +
>         return 0;
>
> +mod_disable:
> +       clk_disable_unprepare(tmdev->mod_clk);
>  bus_disable:
>         clk_disable_unprepare(tmdev->bus_clk);
>  assert_reset:
> @@ -395,6 +409,7 @@ static int sun8i_ths_remove(struct platform_device *pdev)
>  {
>         struct ths_device *tmdev = platform_get_drvdata(pdev);
>
> +       clk_disable_unprepare(tmdev->mod_clk);
>         clk_disable_unprepare(tmdev->bus_clk);
>         reset_control_assert(tmdev->reset);
>
> --
> 2.17.1
>
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

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  reply	other threads:[~2019-08-10  6:17 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-10  5:28 [PATCH v5 00/18] add thermal driver for h6 Yangtao Li
2019-08-10  5:28 ` [PATCH v5 01/18] thermal: sun8i: " Yangtao Li
2019-09-01  2:06   ` Ondřej Jirman
2019-09-01 21:04   ` Ondřej Jirman
2019-08-10  5:28 ` [PATCH v5 02/18] dt-bindings: thermal: add binding document for h6 thermal controller Yangtao Li
2019-08-12  8:56   ` Maxime Ripard
2019-08-12 23:40     ` Frank Lee
2019-08-16  9:47       ` Maxime Ripard
2019-08-10  5:28 ` [PATCH v5 03/18] thermal: fix indentation in makefile Yangtao Li
2019-08-28 12:40   ` Zhang Rui
2019-08-10  5:28 ` [PATCH v5 04/18] thermal: sun8i: get ths sensor number from device compatible Yangtao Li
2019-08-10  5:28 ` [PATCH v5 05/18] thermal: sun8i: rework for sun8i_ths_get_temp() Yangtao Li
2019-08-10  5:28 ` [PATCH v5 06/18] thermal: sun8i: get ths init func from device compatible Yangtao Li
2019-08-10  5:28 ` [PATCH v5 07/18] thermal: sun8i: rework for ths irq handler func Yangtao Li
2019-08-10  5:28 ` [PATCH v5 08/18] thermal: sun8i: support mod clocks Yangtao Li
2019-08-10  6:16   ` Vasily Khoruzhick [this message]
2019-08-12 23:46     ` Frank Lee
2019-08-12 23:54       ` Vasily Khoruzhick
2019-08-13 20:06         ` Ondřej Jirman
2019-08-14  3:01           ` Vasily Khoruzhick
2019-08-25 16:14             ` Frank Lee
2019-10-21  3:41               ` Vasily Khoruzhick
2019-08-10  5:28 ` [PATCH v5 09/18] thermal: sun8i: rework for ths calibrate func Yangtao Li
2019-08-28 12:45   ` Zhang Rui
2019-08-10  5:28 ` [PATCH v5 10/18] dt-bindings: thermal: add binding document for h3 thermal controller Yangtao Li
2019-08-27 15:26   ` Rob Herring
2019-08-10  5:28 ` [PATCH v5 11/18] thermal: sun8i: add thermal driver for h3 Yangtao Li
2019-08-10  5:28 ` [PATCH v5 12/18] dt-bindings: thermal: add binding document for a64 thermal controller Yangtao Li
2019-08-27 15:26   ` Rob Herring
2019-08-10  5:28 ` [PATCH v5 13/18] thermal: sun8i: add thermal driver for A64 Yangtao Li
2019-08-10  5:28 ` [PATCH v5 14/18] dt-bindings: thermal: add binding document for h5 thermal controller Yangtao Li
2019-08-27 15:27   ` Rob Herring
2019-08-10  5:28 ` [PATCH v5 15/18] thermal: sun8i: allow to use custom temperature calculation function Yangtao Li
2019-08-12  8:49   ` Maxime Ripard
2019-08-10  5:28 ` [PATCH v5 16/18] thermal: sun8i: add support for Allwinner H5 thermal sensor Yangtao Li
2019-08-10  5:28 ` [PATCH v5 17/18] dt-bindings: thermal: add binding document for r40 thermal controller Yangtao Li
2019-08-27 15:27   ` Rob Herring
2019-08-10  5:28 ` [PATCH v5 18/18] thermal: sun8i: add support for Allwinner R40 thermal sensor Yangtao Li
2019-08-11 21:14 ` [PATCH v5 00/18] add thermal driver for h6 Clément Péron
2019-08-12 23:36   ` Frank Lee
2019-09-01 21:52 ` Ondřej Jirman
2019-09-02  7:27   ` Maxime Ripard
2019-09-02 10:58     ` Ondřej Jirman
2019-11-26 19:36       ` Vasily Khoruzhick

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