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Message-ID: <CAHLCerMArOceCFQ1XFbsZCAnUdKVX3TVnAb502w+kxmO97bdJg@mail.gmail.com>
Date: Mon, 23 Nov 2020 01:35:22 +0530
From: Amit Kucheria <amit.kucheria@...aro.org>
To: Ansuel Smith <ansuelsmth@...il.com>
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
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?
> /* WATCHDOG */
> WDOG_BARK_STATUS,
> WDOG_BARK_CLEAR,
> --
> 2.27.0
>
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