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Date: Wed, 25 Nov 2020 13:22:28 +0100
From: Ansuel Smith <ansuelsmth@...il.com>
To: Amit Kucheria <amit.kucheria@...aro.org>
Cc: Andy Gross <agross@...nel.org>,
Bjorn Andersson <bjorn.andersson@...aro.org>,
Zhang Rui <rui.zhang@...el.com>,
Daniel Lezcano <daniel.lezcano@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
linux-arm-msm <linux-arm-msm@...r.kernel.org>,
Linux PM list <linux-pm@...r.kernel.org>,
"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
<devicetree@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH v6 2/8] drivers: thermal: tsens: Add VER_0 tsens
version
On Mon, Nov 23, 2020 at 01:35:22AM +0530, Amit Kucheria wrote:
> Hi Ansuel,
>
> See comments inline.
>
> On Fri, Aug 14, 2020 at 7:12 PM Ansuel Smith <ansuelsmth@...il.com> 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.
> >
> > Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
> > ---
> > drivers/thermal/qcom/tsens.c | 122 +++++++++++++++++++++++++++++++----
> > drivers/thermal/qcom/tsens.h | 7 +-
> > 2 files changed, 114 insertions(+), 15 deletions(-)
> >
> > diff --git a/drivers/thermal/qcom/tsens.c b/drivers/thermal/qcom/tsens.c
> > index 9fe9a2b26705..965c4799918a 100644
> > --- a/drivers/thermal/qcom/tsens.c
> > +++ b/drivers/thermal/qcom/tsens.c
> > @@ -516,6 +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;
> > @@ -531,6 +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 +600,21 @@ 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;
> > + }
>
> Let's revisit this after fixing patch 1.
>
>
> > }
> >
> > /* Valid bit is set, OK to read the temperature */
> > @@ -763,6 +782,10 @@ int __init init_common(struct tsens_priv *priv)
> > 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,
> > @@ -781,6 +804,10 @@ 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;
> > @@ -803,6 +830,61 @@ int __init init_common(struct tsens_priv *priv)
> > goto err_put_device;
> > }
> >
> > + priv->rf[TSENS_EN] = devm_regmap_field_alloc(dev, priv->tm_map,
> > + priv->fields[TSENS_EN]);
> > + if (IS_ERR(priv->rf[TSENS_EN])) {
> > + ret = PTR_ERR(priv->rf[TSENS_EN]);
> > + goto err_put_device;
> > + }
> > +
> > + priv->rf[TSENS_SW_RST] = devm_regmap_field_alloc(
> > + dev, priv->tm_map, priv->fields[TSENS_EN]);
> > + if (IS_ERR(priv->rf[TSENS_EN])) {
> > + ret = PTR_ERR(priv->rf[TSENS_EN]);
> > + goto err_put_device;
> > + }
> > +
> > + priv->rf[LOW_INT_CLEAR_0] = devm_regmap_field_alloc(
> > + dev, priv->tm_map, priv->fields[LOW_INT_CLEAR_0]);
> > + if (IS_ERR(priv->rf[LOW_INT_CLEAR_0])) {
> > + ret = PTR_ERR(priv->rf[LOW_INT_CLEAR_0]);
> > + goto err_put_device;
> > + }
> > +
> > + priv->rf[UP_INT_CLEAR_0] = devm_regmap_field_alloc(
> > + dev, priv->tm_map, priv->fields[UP_INT_CLEAR_0]);
> > + if (IS_ERR(priv->rf[UP_INT_CLEAR_0])) {
> > + ret = PTR_ERR(priv->rf[UP_INT_CLEAR_0]);
> > + goto err_put_device;
> > + }
> > +
> > + /* VER_0 require to set MIN and MAX THRESH */
> > + if (tsens_version(priv) < VER_0_1) {
> > + priv->rf[MIN_THRESH_0] = devm_regmap_field_alloc(
> > + dev, priv->tm_map, priv->fields[MIN_THRESH_0]);
> > + if (IS_ERR(priv->rf[MIN_THRESH_0])) {
> > + ret = PTR_ERR(priv->rf[MIN_THRESH_0]);
> > + goto err_put_device;
> > + }
> > +
> > + priv->rf[MAX_THRESH_0] = devm_regmap_field_alloc(
> > + dev, priv->tm_map, priv->fields[MAX_THRESH_0]);
> > + if (IS_ERR(priv->rf[MAX_THRESH_0])) {
> > + ret = PTR_ERR(priv->rf[MAX_THRESH_0]);
> > + goto err_put_device;
> > + }
> > +
> > + regmap_field_write(priv->rf[MIN_THRESH_0], 0);
> > + regmap_field_write(priv->rf[MAX_THRESH_0], 120000);
> > + }
> > +
> > + 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++) {
> > @@ -856,7 +938,11 @@ 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:
> > @@ -952,10 +1038,18 @@ 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 */
> > + if (tsens_version(priv) > VER_0)
> > + ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
> > + thread_fn, IRQF_ONESHOT,
> > + dev_name(&pdev->dev),
> > + priv);
> > + else
> > + ret = devm_request_threaded_irq(&pdev->dev, irq,
> > + thread_fn, NULL,
> > + IRQF_TRIGGER_RISING,
> > + dev_name(&pdev->dev),
> > + priv);
>
>
> Just set a flag variable to ONESHOT OR TRIGGER_RISING and use that in the call.
>
> > if (ret)
> > dev_err(&pdev->dev, "%s: failed to get irq\n",
> > __func__);
> > diff --git a/drivers/thermal/qcom/tsens.h b/drivers/thermal/qcom/tsens.h
> > index 59d01162c66a..f1120791737c 100644
> > --- a/drivers/thermal/qcom/tsens.h
> > +++ b/drivers/thermal/qcom/tsens.h
> > @@ -25,7 +25,8 @@ 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,
> > };
> > @@ -441,6 +442,10 @@ enum regfield_ids {
> > CRIT_THRESH_14,
> > CRIT_THRESH_15,
> >
> > + /* VER_0 MIN MAX THRESH */
> > + MIN_THRESH_0,
> > + MAX_THRESH_0,
> > +
>
> Consider reusing LOW_THRESH_0 and UP_THRESH_0 for these?
>
As we already have defined LOW_THRESH and UP how can we reuse that
regfield to define MIN and MAX?
> > /* WATCHDOG */
> > WDOG_BARK_STATUS,
> > WDOG_BARK_CLEAR,
> > --
> > 2.27.0
> >
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