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Date: Fri, 19 Mar 2021 14:28:06 +0100
From: Ansuel Smith <ansuelsmth@...il.com>
To: Thara Gopinath <thara.gopinath@...aro.org>
Cc: Andy Gross <agross@...nel.org>,
Bjorn Andersson <bjorn.andersson@...aro.org>,
Amit Kucheria <amitk@...nel.org>,
Zhang Rui <rui.zhang@...el.com>,
Daniel Lezcano <daniel.lezcano@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
linux-arm-msm@...r.kernel.org, linux-pm@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v11 1/9] drivers: thermal: tsens: Add VER_0 tsens version
On Fri, Mar 19, 2021 at 09:11:38AM -0400, Thara Gopinath wrote:
>
>
> On 3/18/21 8:52 PM, Ansuel Smith wrote:
> > VER_0 is used to describe device based on tsens version before v0.1.
> > These device are devices based on msm8960 for example apq8064 or
> > ipq806x.
>
> Hi Ansuel,
>
> There are still checkpatch check warnings in this patch. Please run
> checkpatch.pl --strict and fix them. Once that is done, you can add
>
> Reviewed-by: Thara Gopinath <thara.gopinath@...aro.org>
>
> Warm Regards
> Thara
>
Hi,
thanks a lot for the review. The only warning I have is a line ending
with ( that i think I can't fix or I will go over the max char for line.
Do you have something more?
> >
> > Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
> > ---
> > drivers/thermal/qcom/tsens.c | 141 ++++++++++++++++++++++++++++-------
> > drivers/thermal/qcom/tsens.h | 4 +-
> > 2 files changed, 116 insertions(+), 29 deletions(-)
> >
> > diff --git a/drivers/thermal/qcom/tsens.c b/drivers/thermal/qcom/tsens.c
> > index d8ce3a687b80..277d9b17e949 100644
> > --- a/drivers/thermal/qcom/tsens.c
> > +++ b/drivers/thermal/qcom/tsens.c
> > @@ -12,6 +12,7 @@
> > #include <linux/of.h>
> > #include <linux/of_address.h>
> > #include <linux/of_platform.h>
> > +#include <linux/mfd/syscon.h>
> > #include <linux/platform_device.h>
> > #include <linux/pm.h>
> > #include <linux/regmap.h>
> > @@ -515,6 +516,15 @@ static irqreturn_t tsens_irq_thread(int irq, void *data)
> > dev_dbg(priv->dev, "[%u] %s: no violation: %d\n",
> > hw_id, __func__, temp);
> > }
> > +
> > + if (tsens_version(priv) < VER_0_1) {
> > + /* Constraint: There is only 1 interrupt control register for all
> > + * 11 temperature sensor. So monitoring more than 1 sensor based
> > + * on interrupts will yield inconsistent result. To overcome this
> > + * issue we will monitor only sensor 0 which is the master sensor.
> > + */
> > + break;
> > + }
> > }
> > return IRQ_HANDLED;
> > @@ -530,6 +540,13 @@ static int tsens_set_trips(void *_sensor, int low, int high)
> > int high_val, low_val, cl_high, cl_low;
> > u32 hw_id = s->hw_id;
> > + if (tsens_version(priv) < VER_0_1) {
> > + /* Pre v0.1 IP had a single register for each type of interrupt
> > + * and thresholds
> > + */
> > + hw_id = 0;
> > + }
> > +
> > dev_dbg(dev, "[%u] %s: proposed thresholds: (%d:%d)\n",
> > hw_id, __func__, low, high);
> > @@ -584,18 +601,21 @@ int get_temp_tsens_valid(const struct tsens_sensor *s, int *temp)
> > u32 valid;
> > int ret;
> > - ret = regmap_field_read(priv->rf[valid_idx], &valid);
> > - if (ret)
> > - return ret;
> > - while (!valid) {
> > - /* 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.
> > - */
> > - ndelay(400);
> > + /* VER_0 doesn't have VALID bit */
> > + if (tsens_version(priv) >= VER_0_1) {
> > ret = regmap_field_read(priv->rf[valid_idx], &valid);
> > if (ret)
> > return ret;
> > + while (!valid) {
> > + /* 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.
> > + */
> > + ndelay(400);
> > + ret = regmap_field_read(priv->rf[valid_idx], &valid);
> > + if (ret)
> > + return ret;
> > + }
> > }
> > /* Valid bit is set, OK to read the temperature */
> > @@ -608,15 +628,29 @@ int get_temp_common(const struct tsens_sensor *s, int *temp)
> > {
> > struct tsens_priv *priv = s->priv;
> > int hw_id = s->hw_id;
> > - int last_temp = 0, ret;
> > + int last_temp = 0, ret, trdy;
> > + unsigned long timeout;
> > - ret = regmap_field_read(priv->rf[LAST_TEMP_0 + hw_id], &last_temp);
> > - if (ret)
> > - return ret;
> > + timeout = jiffies + usecs_to_jiffies(TIMEOUT_US);
> > + do {
> > + if (tsens_version(priv) == VER_0) {
> > + ret = regmap_field_read(priv->rf[TRDY], &trdy);
> > + if (ret)
> > + return ret;
> > + if (!trdy)
> > + continue;
> > + }
> > - *temp = code_to_degc(last_temp, s) * 1000;
> > + ret = regmap_field_read(priv->rf[LAST_TEMP_0 + hw_id], &last_temp);
> > + if (ret)
> > + return ret;
> > - return 0;
> > + *temp = code_to_degc(last_temp, s) * 1000;
> > +
> > + return 0;
> > + } while (time_before(jiffies, timeout));
> > +
> > + return -ETIMEDOUT;
> > }
> > #ifdef CONFIG_DEBUG_FS
> > @@ -738,19 +772,31 @@ int __init init_common(struct tsens_priv *priv)
> > priv->tm_offset = 0x1000;
> > }
> > - res = platform_get_resource(op, IORESOURCE_MEM, 0);
> > - tm_base = devm_ioremap_resource(dev, res);
> > - if (IS_ERR(tm_base)) {
> > - ret = PTR_ERR(tm_base);
> > - goto err_put_device;
> > + if (tsens_version(priv) >= VER_0_1) {
> > + res = platform_get_resource(op, IORESOURCE_MEM, 0);
> > + tm_base = devm_ioremap_resource(dev, res);
> > + if (IS_ERR(tm_base)) {
> > + ret = PTR_ERR(tm_base);
> > + goto err_put_device;
> > + }
> > +
> > + priv->tm_map = devm_regmap_init_mmio(dev, tm_base, &tsens_config);
> > + } else { /* VER_0 share the same gcc regs using a syscon */
> > + struct device *parent = priv->dev->parent;
> > +
> > + if (parent)
> > + priv->tm_map = syscon_node_to_regmap(parent->of_node);
> > }
> > - priv->tm_map = devm_regmap_init_mmio(dev, tm_base, &tsens_config);
> > - if (IS_ERR(priv->tm_map)) {
> > + if (IS_ERR_OR_NULL(priv->tm_map)) {
> > ret = PTR_ERR(priv->tm_map);
> > goto err_put_device;
> > }
> > + /* VER_0 have only tm_map */
> > + if (!priv->srot_map)
> > + priv->srot_map = priv->tm_map;
> > +
> > if (tsens_version(priv) > VER_0_1) {
> > for (i = VER_MAJOR; i <= VER_STEP; i++) {
> > priv->rf[i] = devm_regmap_field_alloc(dev, priv->srot_map,
> > @@ -769,6 +815,10 @@ int __init init_common(struct tsens_priv *priv)
> > ret = PTR_ERR(priv->rf[TSENS_EN]);
> > goto err_put_device;
> > }
> > + /* in VER_0 TSENS need to be explicitly enabled */
> > + if (tsens_version(priv) == VER_0)
> > + regmap_field_write(priv->rf[TSENS_EN], 1);
> > +
> > ret = regmap_field_read(priv->rf[TSENS_EN], &enabled);
> > if (ret)
> > goto err_put_device;
> > @@ -791,6 +841,20 @@ int __init init_common(struct tsens_priv *priv)
> > goto err_put_device;
> > }
> > + priv->rf[TSENS_SW_RST] = devm_regmap_field_alloc(
> > + dev, priv->srot_map, priv->fields[TSENS_SW_RST]);
> > + if (IS_ERR(priv->rf[TSENS_SW_RST])) {
> > + ret = PTR_ERR(priv->rf[TSENS_SW_RST]);
> > + goto err_put_device;
> > + }
> > +
> > + priv->rf[TRDY] =
> > + devm_regmap_field_alloc(dev, priv->tm_map, priv->fields[TRDY]);
> > + if (IS_ERR(priv->rf[TRDY])) {
> > + ret = PTR_ERR(priv->rf[TRDY]);
> > + 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++) {
> > @@ -806,7 +870,7 @@ int __init init_common(struct tsens_priv *priv)
> > }
> > }
> > - if (priv->feat->crit_int) {
> > + if (priv->feat->crit_int || tsens_version(priv) < VER_0_1) {
> > /* Loop might need changes if enum regfield_ids is reordered */
> > for (j = CRITICAL_STATUS_0; j <= CRIT_THRESH_15; j += 16) {
> > for (i = 0; i < priv->feat->max_sensors; i++) {
> > @@ -844,7 +908,11 @@ int __init init_common(struct tsens_priv *priv)
> > }
> > spin_lock_init(&priv->ul_lock);
> > - tsens_enable_irq(priv);
> > +
> > + /* VER_0 interrupt doesn't need to be enabled */
> > + if (tsens_version(priv) >= VER_0_1)
> > + tsens_enable_irq(priv);
> > +
> > tsens_debug_init(op);
> > err_put_device:
> > @@ -943,10 +1011,14 @@ static int tsens_register_irq(struct tsens_priv *priv, char *irqname,
> > if (irq == -ENXIO)
> > ret = 0;
> > } else {
> > - ret = devm_request_threaded_irq(&pdev->dev, irq,
> > - NULL, thread_fn,
> > - IRQF_ONESHOT,
> > - dev_name(&pdev->dev), priv);
> > + /* VER_0 interrupt is TRIGGER_RISING, VER_0_1 and up is ONESHOT */
> > + ret = devm_request_threaded_irq(
> > + &pdev->dev, irq,
> > + tsens_version(priv) == VER_0 ? thread_fn : NULL,
> > + tsens_version(priv) == VER_0 ? NULL : thread_fn,
> > + tsens_version(priv) == VER_0 ? IRQF_TRIGGER_RISING :
> > + IRQF_ONESHOT,
> > + dev_name(&pdev->dev), priv);
> > if (ret)
> > dev_err(&pdev->dev, "%s: failed to get irq\n",
> > __func__);
> > @@ -975,6 +1047,19 @@ static int tsens_register(struct tsens_priv *priv)
> > priv->ops->enable(priv, i);
> > }
> > + /* VER_0 require to set MIN and MAX THRESH
> > + * These 2 regs are set using the:
> > + * - CRIT_THRESH_0 for MAX THRESH hardcoded to 120°C
> > + * - CRIT_THRESH_1 for MIN THRESH hardcoded to 0°C
> > + */
> > + if (tsens_version(priv) < VER_0_1) {
> > + regmap_field_write(priv->rf[CRIT_THRESH_0],
> > + tsens_mC_to_hw(priv->sensor, 120000));
> > +
> > + regmap_field_write(priv->rf[CRIT_THRESH_1],
> > + tsens_mC_to_hw(priv->sensor, 0));
> > + }
> > +
> > ret = tsens_register_irq(priv, "uplow", tsens_irq_thread);
> > if (ret < 0)
> > return ret;
> > diff --git a/drivers/thermal/qcom/tsens.h b/drivers/thermal/qcom/tsens.h
> > index f40b625f897e..8e6c1fd3ccf5 100644
> > --- a/drivers/thermal/qcom/tsens.h
> > +++ b/drivers/thermal/qcom/tsens.h
> > @@ -13,6 +13,7 @@
> > #define CAL_DEGC_PT2 120
> > #define SLOPE_FACTOR 1000
> > #define SLOPE_DEFAULT 3200
> > +#define TIMEOUT_US 100
> > #define THRESHOLD_MAX_ADC_CODE 0x3ff
> > #define THRESHOLD_MIN_ADC_CODE 0x0
> > @@ -25,7 +26,8 @@ struct tsens_priv;
> > /* IP version numbers in ascending order */
> > enum tsens_ver {
> > - VER_0_1 = 0,
> > + VER_0 = 0,
> > + VER_0_1,
> > VER_1_X,
> > VER_2_X,
> > };
> >
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