Re: [RESEND PATCH] thermal: mediatek: add suspend/resume callback

From: Michael Kao
Date: Thu May 14 2020 - 04:46:18 EST

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On Wed, 2020-04-08 at 17:05 +0800, Michael Kao (éæç) wrote:
> From: Louis Yu <louis.yu@xxxxxxxxxxxx>
>
> 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@xxxxxxxxxxxx>
> Signed-off-by: Michael Kao <michael.kao@xxxxxxxxxxxx>
> ---
> drivers/thermal/mtk_thermal.c | 152 ++++++++++++++++++++++++++++++----
> 1 file changed, 134 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/thermal/mtk_thermal.c b/drivers/thermal/mtk_thermal.c
> index 76e30603d4d5..36fd35fac733 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;
> @@ -541,13 +552,13 @@ static int raw_to_mcelsius(struct mtk_thermal *mt, int sensno, s32 raw)
> }
>
> /**
> - * mtk_thermal_get_bank - get bank
> + * mtk_thermal_lock_bank - get bank
> * @bank: The bank
> *
> * The bank registers are banked, we have to select a bank in the
> * PTPCORESEL register to access it.
> */
> -static void mtk_thermal_get_bank(struct mtk_thermal_bank *bank)
> +static void mtk_thermal_lock_bank(struct mtk_thermal_bank *bank)
> {
> struct mtk_thermal *mt = bank->mt;
> u32 val;
> @@ -563,12 +574,12 @@ static void mtk_thermal_get_bank(struct mtk_thermal_bank *bank)
> }
>
> /**
> - * mtk_thermal_put_bank - release bank
> + * mtk_thermal_unlock_bank - release bank
> * @bank: The bank
> *
> - * release a bank previously taken with mtk_thermal_get_bank,
> + * release a bank previously taken with mtk_thermal_lock_bank,
> */
> -static void mtk_thermal_put_bank(struct mtk_thermal_bank *bank)
> +static void mtk_thermal_unlock_bank(struct mtk_thermal_bank *bank)
> {
> struct mtk_thermal *mt = bank->mt;
>
> @@ -622,11 +633,11 @@ static int mtk_read_temp(void *data, int *temperature)
> for (i = 0; i < mt->conf->num_banks; i++) {
> struct mtk_thermal_bank *bank = &mt->banks[i];
>
> - mtk_thermal_get_bank(bank);
> + mtk_thermal_lock_bank(bank);
>
> tempmax = max(tempmax, mtk_thermal_bank_temperature(bank));
>
> - mtk_thermal_put_bank(bank);
> + mtk_thermal_unlock_bank(bank);
> }
>
> *temperature = tempmax;
> @@ -652,7 +663,7 @@ static void mtk_thermal_init_bank(struct mtk_thermal *mt, int num,
> bank->id = num;
> bank->mt = mt;
>
> - mtk_thermal_get_bank(bank);
> + mtk_thermal_lock_bank(bank);
>
> /* bus clock 66M counting unit is 12 * 15.15ns * 256 = 46.540us */
> writel(TEMP_MONCTL1_PERIOD_UNIT(12), controller_base + TEMP_MONCTL1);
> @@ -743,7 +754,43 @@ static void mtk_thermal_init_bank(struct mtk_thermal *mt, int num,
> TEMP_ADCWRITECTRL_ADC_MUX_WRITE,
> controller_base + TEMP_ADCWRITECTRL);
>
> - mtk_thermal_put_bank(bank);
> + mtk_thermal_unlock_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;
> +
> + mtk_thermal_lock_bank(bank);
> +
> + 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 measurement on sensing points */
> + writel(0x0, mt->thermal_base + TEMP_MONCTL0);
> +
> +out:
> + mtk_thermal_unlock_bank(bank);
> +
> + return ret;
> }
>
> static u64 of_get_phys_base(struct device_node *np)
> @@ -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,
> },
> };
> --
> 2.18.0
>
Hi Daniel,
Just gently ping. Many thanks.

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