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Message-ID: <7e3506e3-a99e-eb01-ee42-5876b542fe38@linaro.org>
Date: Fri, 10 Jan 2020 00:37:35 +0100
From: Daniel Lezcano <daniel.lezcano@...aro.org>
To: Michael Kao <michael.kao@...iatek.com>,
Zhang Rui <rui.zhang@...el.com>,
Eduardo Valentin <edubezval@...il.com>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Matthias Brugger <matthias.bgg@...il.com>, hsinyi@...omium.org,
linux-pm@...r.kernel.org, srv_heupstream@...iatek.com
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
linux-mediatek@...ts.infradead.org,
Louis Yu <louis.yu@...iatek.com>
Subject: Re: [RESEND][PATCH] thermal: mediatek: add suspend/resume callback
On 19/12/2019 10:24, Michael Kao wrote:
> From: Louis Yu <louis.yu@...iatek.com>
>
> Add suspend/resume callback to disable/enable Mediatek thermal sensor
> respectively. Since thermal power domain is off in suspend, thermal driver
> needs re-initialization during resume.
>
> Signed-off-by: Louis Yu <louis.yu@...iatek.com>
> Signed-off-by: Michael Kao <michael.kao@...iatek.com>
> ---
> drivers/thermal/mtk_thermal.c | 134 +++++++++++++++++++++++++++++++---
> 1 file changed, 125 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/thermal/mtk_thermal.c b/drivers/thermal/mtk_thermal.c
> index acf4854cbb8b..2bb8b13591aa 100644
> --- a/drivers/thermal/mtk_thermal.c
> +++ b/drivers/thermal/mtk_thermal.c
> @@ -22,6 +22,7 @@
> #include <linux/thermal.h>
> #include <linux/reset.h>
> #include <linux/types.h>
> +#include <linux/iopoll.h>
>
> /* AUXADC Registers */
> #define AUXADC_CON1_SET_V 0x008
> @@ -31,6 +32,8 @@
>
> #define APMIXED_SYS_TS_CON1 0x604
>
> +#define APMIXED_SYS_TS_CON1_BUFFER_OFF 0x30
> +
> /* Thermal Controller Registers */
> #define TEMP_MONCTL0 0x000
> #define TEMP_MONCTL1 0x004
> @@ -38,6 +41,7 @@
> #define TEMP_MONIDET0 0x014
> #define TEMP_MONIDET1 0x018
> #define TEMP_MSRCTL0 0x038
> +#define TEMP_MSRCTL1 0x03c
> #define TEMP_AHBPOLL 0x040
> #define TEMP_AHBTO 0x044
> #define TEMP_ADCPNP0 0x048
> @@ -87,6 +91,9 @@
> #define TEMP_ADCVALIDMASK_VALID_HIGH BIT(5)
> #define TEMP_ADCVALIDMASK_VALID_POS(bit) (bit)
>
> +#define TEMP_MSRCTL1_BUS_STA (BIT(0) | BIT(7))
> +#define TEMP_MSRCTL1_SENSING_POINTS_PAUSE 0x10E
> +
> /* MT8173 thermal sensors */
> #define MT8173_TS1 0
> #define MT8173_TS2 1
> @@ -250,6 +257,10 @@ struct mtk_thermal_data {
> struct mtk_thermal {
> struct device *dev;
> void __iomem *thermal_base;
> + void __iomem *apmixed_base;
> + void __iomem *auxadc_base;
> + u64 apmixed_phys_base;
> + u64 auxadc_phys_base;
>
> struct clk *clk_peri_therm;
> struct clk *clk_auxadc;
> @@ -746,6 +757,42 @@ static void mtk_thermal_init_bank(struct mtk_thermal *mt, int num,
> mtk_thermal_put_bank(bank);
> }
>
> +static int mtk_thermal_disable_sensing(struct mtk_thermal *mt, int num)
> +{
> + struct mtk_thermal_bank *bank = &mt->banks[num];
> + u32 val;
> + unsigned long timeout;
> + void __iomem *addr;
> + int ret = 0;
> +
> + bank->id = num;
> + bank->mt = mt;
Can you explain why this is done?
> + mtk_thermal_get_bank(bank);
I'm not comfortable with this call. The underlying code is calling
mutex_lock, I suspect it can potentially deadlock the board.
Why do you need a mutex? Isn't a spin_lock enough?
Please take also the opportunity to rename to lock_bank / unlock_bank.
get and put are usually for refcounting.
> + val = readl(mt->thermal_base + TEMP_MSRCTL1);
> + /* pause periodic temperature measurement for sensing points */
> + writel(val | TEMP_MSRCTL1_SENSING_POINTS_PAUSE,
> + mt->thermal_base + TEMP_MSRCTL1);
> +
> + /* wait until temperature measurement bus idle */
> + timeout = jiffies + HZ;
> + addr = mt->thermal_base + TEMP_MSRCTL1;
> +
> + ret = readl_poll_timeout(addr, val, (val & TEMP_MSRCTL1_BUS_STA) == 0x0,
> + 0, timeout);
> + if (ret < 0)
> + goto out;
> +
> + /* disable periodic temperature meausrement on sensing points */
s/meausrement/measurement/
> + writel(0x0, mt->thermal_base + TEMP_MONCTL0);
> +
> +out:
> + mtk_thermal_put_bank(bank);
> +
> + return ret;
> +}
> +
> static u64 of_get_phys_base(struct device_node *np)
> {
> u64 size64;
> @@ -868,7 +915,6 @@ static int mtk_thermal_probe(struct platform_device *pdev)
> struct device_node *auxadc, *apmixedsys, *np = pdev->dev.of_node;
> struct mtk_thermal *mt;
> struct resource *res;
> - u64 auxadc_phys_base, apmixed_phys_base;
> struct thermal_zone_device *tzdev;
>
> mt = devm_kzalloc(&pdev->dev, sizeof(*mt), GFP_KERNEL);
> @@ -904,11 +950,11 @@ static int mtk_thermal_probe(struct platform_device *pdev)
> return -ENODEV;
> }
>
> - auxadc_phys_base = of_get_phys_base(auxadc);
> + mt->auxadc_phys_base = of_get_phys_base(auxadc);
>
> of_node_put(auxadc);
>
> - if (auxadc_phys_base == OF_BAD_ADDR) {
> + if (mt->auxadc_phys_base == OF_BAD_ADDR) {
> dev_err(&pdev->dev, "Can't get auxadc phys address\n");
> return -EINVAL;
> }
> @@ -919,11 +965,12 @@ static int mtk_thermal_probe(struct platform_device *pdev)
> return -ENODEV;
> }
>
> - apmixed_phys_base = of_get_phys_base(apmixedsys);
> + mt->apmixed_phys_base = of_get_phys_base(apmixedsys);
> + mt->apmixed_base = of_iomap(apmixedsys, 0);
>
> of_node_put(apmixedsys);
>
> - if (apmixed_phys_base == OF_BAD_ADDR) {
> + if (mt->apmixed_phys_base == OF_BAD_ADDR) {
> dev_err(&pdev->dev, "Can't get auxadc phys address\n");
> return -EINVAL;
> }
> @@ -935,19 +982,19 @@ static int mtk_thermal_probe(struct platform_device *pdev)
> ret = clk_prepare_enable(mt->clk_auxadc);
> if (ret) {
> dev_err(&pdev->dev, "Can't enable auxadc clk: %d\n", ret);
> - return ret;
> + goto err_disable_clk_auxadc;
> }
>
> ret = clk_prepare_enable(mt->clk_peri_therm);
> if (ret) {
> dev_err(&pdev->dev, "Can't enable peri clk: %d\n", ret);
> - goto err_disable_clk_auxadc;
> + goto err_disable_clk_peri_therm;
> }
>
> for (ctrl_id = 0; ctrl_id < mt->conf->num_controller ; ctrl_id++)
> for (i = 0; i < mt->conf->num_banks; i++)
> - mtk_thermal_init_bank(mt, i, apmixed_phys_base,
> - auxadc_phys_base, ctrl_id);
> + mtk_thermal_init_bank(mt, i, mt->apmixed_phys_base,
> + mt->auxadc_phys_base, ctrl_id);
>
> platform_set_drvdata(pdev, mt);
>
> @@ -978,11 +1025,80 @@ static int mtk_thermal_remove(struct platform_device *pdev)
> return 0;
> }
>
> +static int __maybe_unused mtk_thermal_suspend(struct device *dev)
> +{
> + struct platform_device *pdev = to_platform_device(dev);
> + struct mtk_thermal *mt = platform_get_drvdata(pdev);
> + int i, ret;
> +
> + for (i = 0; i < mt->conf->num_banks; i++) {
> + ret = mtk_thermal_disable_sensing(mt, i);
> + if (ret)
> + goto out;
> + }
> +
> + /* disable buffer */
> + writel(readl(mt->apmixed_base + APMIXED_SYS_TS_CON1) |
> + APMIXED_SYS_TS_CON1_BUFFER_OFF,
> + mt->apmixed_base + APMIXED_SYS_TS_CON1);
> +
> + clk_disable_unprepare(mt->clk_peri_therm);
> + clk_disable_unprepare(mt->clk_auxadc);
> +
> + return 0;
> +
> +out:
> + dev_err(&pdev->dev, "Failed to wait until bus idle\n");
> +
> + return ret;
> +}
> +
> +static int __maybe_unused mtk_thermal_resume(struct device *dev)
> +{
> + struct platform_device *pdev = to_platform_device(dev);
> + struct mtk_thermal *mt = platform_get_drvdata(pdev);
> + int i, ret, ctrl_id;
> +
> + ret = device_reset(&pdev->dev);
> + if (ret)
> + return ret;
> +
> + ret = clk_prepare_enable(mt->clk_auxadc);
> + if (ret) {
> + dev_err(&pdev->dev, "Can't enable auxadc clk: %d\n", ret);
> + goto err_disable_clk_auxadc;
> + }
> +
> + ret = clk_prepare_enable(mt->clk_peri_therm);
> + if (ret) {
> + dev_err(&pdev->dev, "Can't enable peri clk: %d\n", ret);
> + goto err_disable_clk_peri_therm;
> + }
> +
> + for (ctrl_id = 0; ctrl_id < mt->conf->num_controller ; ctrl_id++)
> + for (i = 0; i < mt->conf->num_banks; i++)
> + mtk_thermal_init_bank(mt, i, mt->apmixed_phys_base,
> + mt->auxadc_phys_base, ctrl_id);
> +
> + return 0;
> +
> +err_disable_clk_peri_therm:
> + clk_disable_unprepare(mt->clk_peri_therm);
> +err_disable_clk_auxadc:
> + clk_disable_unprepare(mt->clk_auxadc);
> +
> + return ret;
> +}
> +
> +static SIMPLE_DEV_PM_OPS(mtk_thermal_pm_ops,
> + mtk_thermal_suspend, mtk_thermal_resume);
> +
> static struct platform_driver mtk_thermal_driver = {
> .probe = mtk_thermal_probe,
> .remove = mtk_thermal_remove,
> .driver = {
> .name = "mtk-thermal",
> + .pm = &mtk_thermal_pm_ops,
> .of_match_table = mtk_thermal_of_match,
> },
> };
>
--
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