Re: [PATCH V1] thermal: qcom-spmi-temp-alarm: add support for GEN2 PMIC peripherals

From: kgunda
Date: Wed Aug 16 2017 - 08:23:25 EST

On 2017-08-08 13:42, Zhang Rui wrote:
On Thu, 2017-07-13 at 17:39 +0530, Kiran Gunda wrote:
From: David Collins <collinsd@xxxxxxxxxxxxxx>

Add support for the TEMP_ALARM GEN2 PMIC peripheral subtype.ÂÂThe
GEN2 subtype defines an over temperature state with hysteresis
instead of stage in the status register.ÂÂThere are two GEN2
states corresponding to stages 1 and 2.

Signed-off-by: David Collins <collinsd@xxxxxxxxxxxxxx>
Signed-off-by: Kiran Gunda <kgunda@xxxxxxxxxxxxxx>

Ivan,

can you please review this patch and let me know your opinion?

thanks,
rui

Ivan,
Could you please review this patch ?

Thanks,
Kiran
---
Âdrivers/thermal/qcom-spmi-temp-alarm.c | 92
++++++++++++++++++++++++++--------
Â1 file changed, 71 insertions(+), 21 deletions(-)

diff --git a/drivers/thermal/qcom-spmi-temp-alarm.c
b/drivers/thermal/qcom-spmi-temp-alarm.c
index f502419..a5e17ba 100644
--- a/drivers/thermal/qcom-spmi-temp-alarm.c
+++ b/drivers/thermal/qcom-spmi-temp-alarm.c
@@ -1,5 +1,5 @@
Â/*
- * Copyright (c) 2011-2015, The Linux Foundation. All rights
reserved.
+ * Copyright (c) 2011-2015, 2017, The Linux Foundation. All rights
reserved.
 *
 * This program is free software; you can redistribute it and/or
modify
 * it under the terms of the GNU General Public License version 2
and
@@ -11,6 +11,7 @@
 * GNU General Public License for more details.
 */
Â
+#include <linux/bitops.h>
Â#include <linux/delay.h>
Â#include <linux/err.h>
Â#include <linux/iio/consumer.h>
@@ -29,13 +30,17 @@
Â#define QPNP_TM_REG_ALARM_CTRL 0x46
Â
Â#define QPNP_TM_TYPE 0x09
-#define QPNP_TM_SUBTYPE 0x08
+#define QPNP_TM_SUBTYPE_GEN1 0x08
+#define QPNP_TM_SUBTYPE_GEN2 0x09
Â
-#define STATUS_STAGE_MASK 0x03
+#define STATUS_GEN1_STAGE_MASK GENMASK(1, 0)
+#define STATUS_GEN2_STATE_MASK GENMASK(6, 4)
+#define STATUS_GEN2_STATE_SHIFT 4
Â
-#define SHUTDOWN_CTRL1_THRESHOLD_MASK 0x03
+#define SHUTDOWN_CTRL1_OVERRIDE_MASK GENMASK(7, 6)
+#define SHUTDOWN_CTRL1_THRESHOLD_MASK GENMASK(1, 0)
Â
-#define ALARM_CTRL_FORCE_ENABLE 0x80
+#define ALARM_CTRL_FORCE_ENABLE BIT(7)
Â
Â/*
 * Trip point values based on threshold control
@@ -58,6 +63,7 @@
Âstruct qpnp_tm_chip {
 struct regmap *map;
 struct thermal_zone_device *tz_dev;
+ unsigned int subtype;
 long temp;
 unsigned int thresh;
 unsigned int stage;
@@ -66,6 +72,9 @@ struct qpnp_tm_chip {
 struct iio_channel *adc;
Â};
Â
+/* This array maps from GEN2 alarm state to GEN1 alarm stage */
+static const unsigned int alarm_state_map[8] = {0, 1, 1, 2, 2, 3, 3,
3};
+
Âstatic int qpnp_tm_read(struct qpnp_tm_chip *chip, u16 addr, u8
*data)
Â{
 unsigned int val;
@@ -84,30 +93,59 @@ static int qpnp_tm_write(struct qpnp_tm_chip
*chip, u16 addr, u8 data)
 return regmap_write(chip->map, chip->base + addr, data);
Â}
Â
+/**
+ * qpnp_tm_get_temp_stage() - return over-temperature stage
+ * @chip: Pointer to the qpnp_tm chip
+ *
+ * Return: stage (GEN1) or state (GEN2) on success, or errno on
failure.
+ */
+static int qpnp_tm_get_temp_stage(struct qpnp_tm_chip *chip)
+{
+ int ret;
+ u8 reg = 0;
+
+ ret = qpnp_tm_read(chip, QPNP_TM_REG_STATUS, &reg);
+ if (ret < 0)
+ return ret;
+
+ if (chip->subtype == QPNP_TM_SUBTYPE_GEN1)
+ ret = reg & STATUS_GEN1_STAGE_MASK;
+ else
+ ret = (reg & STATUS_GEN2_STATE_MASK) >>
STATUS_GEN2_STATE_SHIFT;
+
+ return ret;
+}
+
Â/*
 * This function updates the internal temp value based on the
 * current thermal stage and threshold as well as the previous stage
 */
Âstatic int qpnp_tm_update_temp_no_adc(struct qpnp_tm_chip *chip)
Â{
- unsigned int stage;
+ unsigned int stage, stage_new, stage_old;
 int ret;
- u8 reg = 0;
Â
- ret = qpnp_tm_read(chip, QPNP_TM_REG_STATUS, &reg);
+ ret = qpnp_tm_get_temp_stage(chip);
 if (ret < 0)
 return ret;
+ stage = ret;
Â
- stage = reg & STATUS_STAGE_MASK;
+ if (chip->subtype == QPNP_TM_SUBTYPE_GEN1) {
+ stage_new = stage;
+ stage_old = chip->stage;
+ } else {
+ stage_new = alarm_state_map[stage];
+ stage_old = alarm_state_map[chip->stage];
+ }
Â
- if (stage > chip->stage) {
+ if (stage_new > stage_old) {
 /* increasing stage, use lower bound */
- chip->temp = (stage - 1) * TEMP_STAGE_STEP +
+ chip->temp = (stage_new - 1) * TEMP_STAGE_STEP +
 ÂÂÂÂÂchip->thresh * TEMP_THRESH_STEP +
 ÂÂÂÂÂTEMP_STAGE_HYSTERESIS +
TEMP_THRESH_MIN;
- } else if (stage < chip->stage) {
+ } else if (stage_new < stage_old) {
 /* decreasing stage, use upper bound */
- chip->temp = stage * TEMP_STAGE_STEP +
+ chip->temp = stage_new * TEMP_STAGE_STEP +
 ÂÂÂÂÂchip->thresh * TEMP_THRESH_STEP -
 ÂÂÂÂÂTEMP_STAGE_HYSTERESIS +
TEMP_THRESH_MIN;
 }
@@ -162,28 +200,37 @@ static irqreturn_t qpnp_tm_isr(int irq, void
*data)
 */
Âstatic int qpnp_tm_init(struct qpnp_tm_chip *chip)
Â{
+ unsigned int stage;
 int ret;
- u8 reg;
+ u8 reg = 0;
Â
- chip->thresh = THRESH_MIN;
+ ret = qpnp_tm_read(chip, QPNP_TM_REG_SHUTDOWN_CTRL1, &reg);
+ if (ret < 0)
+ return ret;
+
+ chip->thresh = reg & SHUTDOWN_CTRL1_THRESHOLD_MASK;
 chip->temp = DEFAULT_TEMP;
Â
- ret = qpnp_tm_read(chip, QPNP_TM_REG_STATUS, &reg);
+ ret = qpnp_tm_get_temp_stage(chip);
 if (ret < 0)
 return ret;
+ chip->stage = ret;
Â
- chip->stage = reg & STATUS_STAGE_MASK;
+ stage = chip->subtype == QPNP_TM_SUBTYPE_GEN1
+ ? chip->stage : alarm_state_map[chip->stage];
Â
- if (chip->stage)
+ if (stage)
 chip->temp = chip->thresh * TEMP_THRESH_STEP +
- ÂÂÂÂÂ(chip->stage - 1) * TEMP_STAGE_STEP +
+ ÂÂÂÂÂ(stage - 1) * TEMP_STAGE_STEP +
 ÂÂÂÂÂTEMP_THRESH_MIN;
Â
 /*
 Â* Set threshold and disable software override of stage 2
and 3
 Â* shutdowns.
 Â*/
- reg = chip->thresh & SHUTDOWN_CTRL1_THRESHOLD_MASK;
+ chip->thresh = THRESH_MIN;
+ reg &= ~(SHUTDOWN_CTRL1_OVERRIDE_MASK |
SHUTDOWN_CTRL1_THRESHOLD_MASK);
+ reg |= chip->thresh & SHUTDOWN_CTRL1_THRESHOLD_MASK;
 ret = qpnp_tm_write(chip, QPNP_TM_REG_SHUTDOWN_CTRL1, reg);
 if (ret < 0)
 return ret;
@@ -242,13 +289,16 @@ static int qpnp_tm_probe(struct platform_device
*pdev)
 goto fail;
 }
Â
- if (type != QPNP_TM_TYPE || subtype != QPNP_TM_SUBTYPE) {
+ if (type != QPNP_TM_TYPE || (subtype != QPNP_TM_SUBTYPE_GEN1
+ ÂÂÂÂÂ&& subtype !=
QPNP_TM_SUBTYPE_GEN2)) {
 dev_err(&pdev->dev, "invalid type 0x%02x or subtype
0x%02x\n",
 type, subtype);
 ret = -ENODEV;
 goto fail;
 }
Â
+ chip->subtype = subtype;
+
 ret = qpnp_tm_init(chip);
 if (ret < 0) {
 dev_err(&pdev->dev, "init failed\n");
--
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