diff options
Diffstat (limited to 'drivers/thermal/qcom/tsens.c')
-rw-r--r-- | drivers/thermal/qcom/tsens.c | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/drivers/thermal/qcom/tsens.c b/drivers/thermal/qcom/tsens.c index b5b136ff323f..4476a07af131 100644 --- a/drivers/thermal/qcom/tsens.c +++ b/drivers/thermal/qcom/tsens.c @@ -7,6 +7,7 @@ #include <linux/debugfs.h> #include <linux/err.h> #include <linux/io.h> +#include <linux/qcom_scm.h> #include <linux/module.h> #include <linux/nvmem-consumer.h> #include <linux/of.h> @@ -615,6 +616,113 @@ static void tsens_disable_irq(struct tsens_priv *priv) regmap_field_write(priv->rf[INT_EN], 0); } +static int tsens_reenable_hw_after_scm(struct tsens_priv *priv) +{ + /* + * Re-enable watchdog, unmask the bark and + * disable cycle completion monitoring. + */ + regmap_field_write(priv->rf[WDOG_BARK_CLEAR], 1); + regmap_field_write(priv->rf[WDOG_BARK_CLEAR], 0); + regmap_field_write(priv->rf[WDOG_BARK_MASK], 0); + regmap_field_write(priv->rf[CC_MON_MASK], 1); + + /* Re-enable interrupts */ + tsens_enable_irq(priv); + + return 0; +} + +static int tsens_health_check_and_reinit(struct tsens_priv *priv, + int hw_id) +{ + int ret, trdy, first_round, sw_reg; + unsigned long timeout; + + /* First check if TRDY is SET */ + ret = regmap_field_read(priv->rf[TRDY], &trdy); + if (ret) + goto err; + + if (!trdy) { + ret = regmap_field_read(priv->rf[FIRST_ROUND_COMPLETE], &first_round); + if (ret) + goto err; + + if (!first_round) { + WARN_ON(!mutex_is_locked(&priv->reinit_mutex)); + + /* Wait for 2 ms for tsens controller to recover */ + timeout = jiffies + msecs_to_jiffies(RESET_TIMEOUT_MS); + do { + ret = regmap_field_read(priv->rf[FIRST_ROUND_COMPLETE], + &first_round); + if (ret) + goto err; + + if (first_round) { + dev_dbg(priv->dev, "tsens controller recovered\n"); + return 0; /* success */ + } + } while (time_before(jiffies, timeout)); + + spin_lock(&priv->reinit_lock); + + /* + * Invoke SCM call only if SW register write is + * reflecting in controller. Try it for 2 ms. + * In case that fails mark the tsens controller + * as unrecoverable. + */ + timeout = jiffies + msecs_to_jiffies(RESET_TIMEOUT_MS); + do { + ret = regmap_field_write(priv->rf[INT_EN], CRITICAL_INT_EN); + if (ret) + goto err; + + ret = regmap_field_read(priv->rf[INT_EN], &sw_reg); + if (ret) + goto err; + } while ((sw_reg & CRITICAL_INT_EN) && (time_before(jiffies, timeout))); + + if (!(sw_reg & CRITICAL_INT_EN)) { + ret = -ENOTRECOVERABLE; + goto err; + } + + /* + * tsens controller did not recover, + * proceed with SCM call to re-init it. + */ + ret = qcom_scm_tsens_reinit(); + if (ret) { + dev_err(priv->dev, "tsens reinit scm call failed (%d)\n", ret); + goto err; + } + + /* + * After the SCM call, we need to re-enable + * the interrupts and also set active threshold + * for each sensor. + */ + ret = tsens_reenable_hw_after_scm(priv); + if (ret) { + dev_err(priv->dev, + "tsens re-enable after scm call failed (%d)\n", ret); + goto err; + } + + /* Notify reinit wa worker */ + queue_work(system_highpri_wq, &priv->reinit_wa_notify); + + spin_unlock(&priv->reinit_lock); + } + } + +err: + return ret; +} + int get_temp_tsens_valid(const struct tsens_sensor *s, int *temp) { struct tsens_priv *priv = s->priv; @@ -628,6 +736,21 @@ int get_temp_tsens_valid(const struct tsens_sensor *s, int *temp) if (tsens_version(priv) == VER_0) goto get_temp; + /* + * For some tsens controllers, its suggested to + * monitor the controller health periodically + * and in case an issue is detected to reinit + * tsens controller via trustzone. + */ + if (priv->needs_reinit_wa) { + mutex_lock(&priv->reinit_mutex); + ret = tsens_health_check_and_reinit(priv, hw_id); + mutex_unlock(&priv->reinit_mutex); + + if (ret) + return ret; + } + /* Valid bit is 0 for 6 AHB clock cycles. * At 19.2MHz, 1 AHB clock is ~60ns. * We should enter this loop very, very rarely. @@ -753,6 +876,40 @@ static const struct regmap_config tsens_srot_config = { .reg_stride = 4, }; +static void __tsens_reinit_worker(struct tsens_priv *priv) +{ + int ret, temp; + unsigned int i; + struct tsens_irq_data d; + + for (i = 0; i < priv->num_sensors; i++) { + const struct tsens_sensor *s = &priv->sensor[i]; + u32 hw_id = s->hw_id; + + if (!s->tzd) + continue; + if (!tsens_threshold_violated(priv, hw_id, &d)) + continue; + + ret = get_temp_tsens_valid(s, &temp); + if (ret) { + dev_err(priv->dev, "[%u] error reading sensor during reinit\n", hw_id); + continue; + } + + tsens_read_irq_state(priv, hw_id, s, &d); + + if ((d.up_thresh < temp) || (d.low_thresh > temp)) { + dev_dbg(priv->dev, "[%u] TZ update trigger during reinit (%d mC)\n", + hw_id, temp); + thermal_zone_device_update(s->tzd, THERMAL_EVENT_UNSPECIFIED); + } else { + dev_dbg(priv->dev, "[%u] no violation during reinit (%d)\n", + hw_id, temp); + } + } +} + int __init init_common(struct tsens_priv *priv) { void __iomem *tm_base, *srot_base; @@ -874,6 +1031,14 @@ int __init init_common(struct tsens_priv *priv) goto err_put_device; } + priv->rf[FIRST_ROUND_COMPLETE] = devm_regmap_field_alloc(dev, + priv->tm_map, + priv->fields[FIRST_ROUND_COMPLETE]); + if (IS_ERR(priv->rf[FIRST_ROUND_COMPLETE])) { + ret = PTR_ERR(priv->rf[FIRST_ROUND_COMPLETE]); + goto err_put_device; + } + /* This loop might need changes if enum regfield_ids is reordered */ for (j = LAST_TEMP_0; j <= UP_THRESH_15; j += 16) { for (i = 0; i < priv->feat->max_sensors; i++) { @@ -996,6 +1161,9 @@ static const struct of_device_id tsens_table[] = { .compatible = "qcom,msm8996-tsens", .data = &data_8996, }, { + .compatible = "qcom,sm8150-tsens", + .data = &data_tsens_v2_reinit, + }, { .compatible = "qcom,tsens-v1", .data = &data_tsens_v1, }, { @@ -1102,6 +1270,14 @@ static int tsens_register(struct tsens_priv *priv) return ret; } +static void tsens_reinit_worker_notify(struct work_struct *work) +{ + struct tsens_priv *priv = container_of(work, struct tsens_priv, + reinit_wa_notify); + + __tsens_reinit_worker(priv); +} + static int tsens_probe(struct platform_device *pdev) { int ret, i; @@ -1143,6 +1319,11 @@ static int tsens_probe(struct platform_device *pdev) priv->dev = dev; priv->num_sensors = num_sensors; + priv->needs_reinit_wa = data->needs_reinit_wa; + + if (priv->needs_reinit_wa && !qcom_scm_is_available()) + return -EPROBE_DEFER; + priv->ops = data->ops; for (i = 0; i < priv->num_sensors; i++) { if (data->hw_ids) @@ -1158,6 +1339,25 @@ static int tsens_probe(struct platform_device *pdev) if (!priv->ops || !priv->ops->init || !priv->ops->get_temp) return -EINVAL; + /* + * Reinitialization workaround is currently supported only for + * tsens controller versions v2. + * + * If incorrect platform data is passed to this effect, ignore + * the requested setting and move forward. + */ + if (priv->needs_reinit_wa && (tsens_version(priv) < VER_2_X)) { + dev_warn(dev, + "%s: Reinit quirk available only for tsens v2\n", __func__); + priv->needs_reinit_wa = false; + } + + mutex_init(&priv->reinit_mutex); + spin_lock_init(&priv->reinit_lock); + + if (priv->needs_reinit_wa) + INIT_WORK(&priv->reinit_wa_notify, tsens_reinit_worker_notify); + ret = priv->ops->init(priv); if (ret < 0) { dev_err(dev, "%s: init failed\n", __func__); |