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Message-ID: <9ba0e257-91fa-485f-b903-04ef08307970@bootlin.com>
Date: Tue, 14 May 2024 15:20:07 +0200
From: Thomas Richard <thomas.richard@...tlin.com>
To: rafael@...nel.org, daniel.lezcano@...aro.org
Cc: rui.zhang@...el.com, lukasz.luba@....com, linux-pm@...r.kernel.org,
linux-kernel@...r.kernel.org, gregory.clement@...tlin.com,
thomas.petazzoni@...tlin.com, theo.lebrun@...tlin.com, u-kumar1@...com,
j-keerthy@...com
Subject: Re: [PATCH v4] thermal: k3_j72xx_bandgap: implement suspend/resume
support
On 4/25/24 17:32, Thomas Richard wrote:
> From: Théo Lebrun <theo.lebrun@...tlin.com>
>
> This add suspend-to-ram support.
Gentle ping.
Do you have any comments for this v4 ?
Best Regards,
Thomas
>
> The derived_table is kept-as is, so the resume is only about
> pm_runtime_* calls and restoring the same registers as the probe.
>
> Extract the hardware initialization procedure to a function called at
> both probe-time & resume-time.
>
> The probe-time loop is split in two to ensure doing the hardware
> initialization before registering thermal zones. That ensures our
> callbacks cannot be called while in bad state.
>
> The 100ms delay in the hardware initialization sequence was removed.
> It was initially added to be sure the thresholds are programmed before
> enabling the interrupt, but in fact it's not needed (tested on J7200
> platform).
>
> Signed-off-by: Théo Lebrun <theo.lebrun@...tlin.com>
> Acked-by: Keerthy <j-keerthy@...com>
> Signed-off-by: Thomas Richard <thomas.richard@...tlin.com>
> ---
>
> v4:
> - Remove the 100ms delay in the hardware initialization sequence
> v3:
> - Remove __maybe_unused attributes and use the magic of PTR_IF()
> v2:
> - Fix warnings/errors reported by kernel test robot
>
> drivers/thermal/k3_j72xx_bandgap.c | 111 ++++++++++++++++++++---------
> 1 file changed, 78 insertions(+), 33 deletions(-)
>
> diff --git a/drivers/thermal/k3_j72xx_bandgap.c b/drivers/thermal/k3_j72xx_bandgap.c
> index c74094a86982..9bc279ac131a 100644
> --- a/drivers/thermal/k3_j72xx_bandgap.c
> +++ b/drivers/thermal/k3_j72xx_bandgap.c
> @@ -178,6 +178,7 @@ struct k3_j72xx_bandgap {
> void __iomem *base;
> void __iomem *cfg2_base;
> struct k3_thermal_data *ts_data[K3_VTM_MAX_NUM_TS];
> + int cnt;
> };
>
> /* common data structures */
> @@ -338,24 +339,52 @@ static void print_look_up_table(struct device *dev, int *ref_table)
> dev_dbg(dev, "%d %d %d\n", i, derived_table[i], ref_table[i]);
> }
>
> +static void k3_j72xx_bandgap_init_hw(struct k3_j72xx_bandgap *bgp)
> +{
> + struct k3_thermal_data *data;
> + int id, high_max, low_temp;
> + u32 val;
> +
> + for (id = 0; id < bgp->cnt; id++) {
> + data = bgp->ts_data[id];
> + val = readl(bgp->cfg2_base + data->ctrl_offset);
> + val |= (K3_VTM_TMPSENS_CTRL_MAXT_OUTRG_EN |
> + K3_VTM_TMPSENS_CTRL_SOC |
> + K3_VTM_TMPSENS_CTRL_CLRZ | BIT(4));
> + writel(val, bgp->cfg2_base + data->ctrl_offset);
> + }
> +
> + /*
> + * Program TSHUT thresholds
> + * Step 1: set the thresholds to ~123C and 105C WKUP_VTM_MISC_CTRL2
> + * Step 2: WKUP_VTM_TMPSENS_CTRL_j set the MAXT_OUTRG_EN bit
> + * This is already taken care as per of init
> + * Step 3: WKUP_VTM_MISC_CTRL set the ANYMAXT_OUTRG_ALERT_EN bit
> + */
> + high_max = k3_j72xx_bandgap_temp_to_adc_code(MAX_TEMP);
> + low_temp = k3_j72xx_bandgap_temp_to_adc_code(COOL_DOWN_TEMP);
> +
> + writel((low_temp << 16) | high_max, bgp->cfg2_base + K3_VTM_MISC_CTRL2_OFFSET);
> + writel(K3_VTM_ANYMAXT_OUTRG_ALERT_EN, bgp->cfg2_base + K3_VTM_MISC_CTRL_OFFSET);
> +}
> +
> struct k3_j72xx_bandgap_data {
> const bool has_errata_i2128;
> };
>
> static int k3_j72xx_bandgap_probe(struct platform_device *pdev)
> {
> - int ret = 0, cnt, val, id;
> - int high_max, low_temp;
> - struct resource *res;
> + const struct k3_j72xx_bandgap_data *driver_data;
> + struct thermal_zone_device *ti_thermal;
> struct device *dev = &pdev->dev;
> + bool workaround_needed = false;
> struct k3_j72xx_bandgap *bgp;
> struct k3_thermal_data *data;
> - bool workaround_needed = false;
> - const struct k3_j72xx_bandgap_data *driver_data;
> - struct thermal_zone_device *ti_thermal;
> - int *ref_table;
> struct err_values err_vals;
> void __iomem *fuse_base;
> + int ret = 0, val, id;
> + struct resource *res;
> + int *ref_table;
>
> const s64 golden_factors[] = {
> -490019999999999936,
> @@ -422,10 +451,10 @@ static int k3_j72xx_bandgap_probe(struct platform_device *pdev)
>
> /* Get the sensor count in the VTM */
> val = readl(bgp->base + K3_VTM_DEVINFO_PWR0_OFFSET);
> - cnt = val & K3_VTM_DEVINFO_PWR0_TEMPSENS_CT_MASK;
> - cnt >>= __ffs(K3_VTM_DEVINFO_PWR0_TEMPSENS_CT_MASK);
> + bgp->cnt = val & K3_VTM_DEVINFO_PWR0_TEMPSENS_CT_MASK;
> + bgp->cnt >>= __ffs(K3_VTM_DEVINFO_PWR0_TEMPSENS_CT_MASK);
>
> - data = devm_kcalloc(bgp->dev, cnt, sizeof(*data), GFP_KERNEL);
> + data = devm_kcalloc(bgp->dev, bgp->cnt, sizeof(*data), GFP_KERNEL);
> if (!data) {
> ret = -ENOMEM;
> goto err_alloc;
> @@ -449,8 +478,8 @@ static int k3_j72xx_bandgap_probe(struct platform_device *pdev)
> else
> init_table(3, ref_table, pvt_wa_factors);
>
> - /* Register the thermal sensors */
> - for (id = 0; id < cnt; id++) {
> + /* Precompute the derived table & fill each thermal sensor struct */
> + for (id = 0; id < bgp->cnt; id++) {
> data[id].bgp = bgp;
> data[id].ctrl_offset = K3_VTM_TMPSENS0_CTRL_OFFSET + id * 0x20;
> data[id].stat_offset = data[id].ctrl_offset +
> @@ -470,13 +499,13 @@ static int k3_j72xx_bandgap_probe(struct platform_device *pdev)
> else if (id == 0 && !workaround_needed)
> memcpy(derived_table, ref_table, TABLE_SIZE * 4);
>
> - val = readl(data[id].bgp->cfg2_base + data[id].ctrl_offset);
> - val |= (K3_VTM_TMPSENS_CTRL_MAXT_OUTRG_EN |
> - K3_VTM_TMPSENS_CTRL_SOC |
> - K3_VTM_TMPSENS_CTRL_CLRZ | BIT(4));
> - writel(val, data[id].bgp->cfg2_base + data[id].ctrl_offset);
> -
> bgp->ts_data[id] = &data[id];
> + }
> +
> + k3_j72xx_bandgap_init_hw(bgp);
> +
> + /* Register the thermal sensors */
> + for (id = 0; id < bgp->cnt; id++) {
> ti_thermal = devm_thermal_of_zone_register(bgp->dev, id, &data[id],
> &k3_of_thermal_ops);
> if (IS_ERR(ti_thermal)) {
> @@ -486,21 +515,7 @@ static int k3_j72xx_bandgap_probe(struct platform_device *pdev)
> }
> }
>
> - /*
> - * Program TSHUT thresholds
> - * Step 1: set the thresholds to ~123C and 105C WKUP_VTM_MISC_CTRL2
> - * Step 2: WKUP_VTM_TMPSENS_CTRL_j set the MAXT_OUTRG_EN bit
> - * This is already taken care as per of init
> - * Step 3: WKUP_VTM_MISC_CTRL set the ANYMAXT_OUTRG_ALERT_EN bit
> - */
> - high_max = k3_j72xx_bandgap_temp_to_adc_code(MAX_TEMP);
> - low_temp = k3_j72xx_bandgap_temp_to_adc_code(COOL_DOWN_TEMP);
> -
> - writel((low_temp << 16) | high_max, data[0].bgp->cfg2_base +
> - K3_VTM_MISC_CTRL2_OFFSET);
> - mdelay(100);
> - writel(K3_VTM_ANYMAXT_OUTRG_ALERT_EN, data[0].bgp->cfg2_base +
> - K3_VTM_MISC_CTRL_OFFSET);
> + platform_set_drvdata(pdev, bgp);
>
> print_look_up_table(dev, ref_table);
> /*
> @@ -527,6 +542,35 @@ static void k3_j72xx_bandgap_remove(struct platform_device *pdev)
> pm_runtime_disable(&pdev->dev);
> }
>
> +static int k3_j72xx_bandgap_suspend(struct device *dev)
> +{
> + pm_runtime_put_sync(dev);
> + pm_runtime_disable(dev);
> + return 0;
> +}
> +
> +static int k3_j72xx_bandgap_resume(struct device *dev)
> +{
> + struct k3_j72xx_bandgap *bgp = dev_get_drvdata(dev);
> + int ret;
> +
> + pm_runtime_enable(dev);
> + ret = pm_runtime_get_sync(dev);
> + if (ret < 0) {
> + pm_runtime_put_noidle(dev);
> + pm_runtime_disable(dev);
> + return ret;
> + }
> +
> + k3_j72xx_bandgap_init_hw(bgp);
> +
> + return 0;
> +}
> +
> +static DEFINE_SIMPLE_DEV_PM_OPS(k3_j72xx_bandgap_pm_ops,
> + k3_j72xx_bandgap_suspend,
> + k3_j72xx_bandgap_resume);
> +
> static const struct k3_j72xx_bandgap_data k3_j72xx_bandgap_j721e_data = {
> .has_errata_i2128 = true,
> };
> @@ -554,6 +598,7 @@ static struct platform_driver k3_j72xx_bandgap_sensor_driver = {
> .driver = {
> .name = "k3-j72xx-soc-thermal",
> .of_match_table = of_k3_j72xx_bandgap_match,
> + .pm = pm_sleep_ptr(&k3_j72xx_bandgap_pm_ops),
> },
> };
>
--
Thomas Richard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
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