Add power on/off reason message for debug.
Signed-off-by: Jun Nie <jun.nie@xxxxxxxxxx>
---
drivers/power/reset/qcom-pon.c | 124 ++++++++++++++++++++++++++++++++-
1 file changed, 123 insertions(+), 1 deletion(-)
diff --git a/drivers/power/reset/qcom-pon.c b/drivers/power/reset/qcom-pon.c
index 4a688741a88a..012b87f5ab1d 100644
--- a/drivers/power/reset/qcom-pon.c
+++ b/drivers/power/reset/qcom-pon.c
@@ -12,6 +12,11 @@
#include <linux/reboot-mode.h>
#include <linux/regmap.h>
+#define PON_REASON1 0x08
+#define PON_WARM_RESET_REASON1 0x0a
+#define PON_WARM_RESET_REASON2 0x0b
+#define PON_WARM_RESET_TFT BIT(4)
+#define POFF_REASON1 0x0c
#define PON_SOFT_RB_SPARE 0x8f
#define GEN1_REASON_SHIFT 2
@@ -23,6 +28,41 @@ struct pm8916_pon {
u32 baseaddr;
struct reboot_mode_driver reboot_mode;
long reason_shift;
+ int pon_trigger_reason;
+ int pon_power_off_reason;
+ unsigned int warm_reset_reason1;
+ unsigned int warm_reset_reason2;
+};
+
+static const char * const pm8916_pon_reason[] = {
+ [0] = "Triggered from Hard Reset",
+ [1] = "Triggered from SMPL (sudden momentary power loss)",
+ [2] = "Triggered from RTC (RTC alarm expiry)",
+ [3] = "Triggered from DC (DC charger insertion)",
+ [4] = "Triggered from USB (USB charger insertion)",
+ [5] = "Triggered from PON1 (secondary PMIC)",
+ [6] = "Triggered from CBL (external power supply)",
+ [7] = "Triggered from KPD (power key press)",
+};
+
+static const char * const pm8916_poff_reason[] = {
+ [0] = "Triggered from SOFT (Software)",
+ [1] = "Triggered from PS_HOLD (PS_HOLD/MSM controlled shutdown)",
+ [2] = "Triggered from PMIC_WD (PMIC watchdog)",
+ [3] = "Triggered from GP1 (Keypad_Reset1)",
+ [4] = "Triggered from GP2 (Keypad_Reset2)",
+ [5] = "Triggered from KPDPWR_AND_RESIN"
+ "(Simultaneous power key and reset line)",
+ [6] = "Triggered from RESIN_N (Reset line/Volume Down Key)",
+ [7] = "Triggered from KPDPWR_N (Long Power Key hold)",
+ [8] = "N/A",
+ [9] = "N/A",
+ [10] = "N/A",
+ [11] = "Triggered from CHARGER (Charger ENUM_TIMER, BOOT_DONE)",
+ [12] = "Triggered from TFT (Thermal Fault Tolerance)",
+ [13] = "Triggered from UVLO (Under Voltage Lock Out)",
+ [14] = "Triggered from OTST3 (Overtemp)",
+ [15] = "Triggered from STAGE3 (Stage 3 reset)",
};
static int pm8916_reboot_mode_write(struct reboot_mode_driver *reboot,
@@ -42,10 +82,49 @@ static int pm8916_reboot_mode_write(struct reboot_mode_driver *reboot,
return ret;
}
+/*
+ * This function stores the PMIC warm reset reason register values. It also
+ * clears these registers if the qcom,clear-warm-reset device tree property
+ * is specified.
+ */
+static int pm8916_pon_store_and_clear_warm_reset(struct pm8916_pon *pon)
+{
+ int rc;
+
+ rc = regmap_read(pon->regmap,
+ pon->baseaddr + PON_WARM_RESET_REASON1,
+ &pon->warm_reset_reason1);
+ if (rc) {
+ dev_err(pon->dev,
+ "Unable to read addr=%x, rc(%d)\n",
+ PON_WARM_RESET_REASON1, rc);
+ return rc;
+ }
+
+ rc = regmap_read(pon->regmap,
+ pon->baseaddr + PON_WARM_RESET_REASON2,
+ &pon->warm_reset_reason2);
+ if (rc) {
+ dev_err(pon->dev,
+ "Unable to read addr=%x, rc(%d)\n",
+ PON_WARM_RESET_REASON2, rc);
+ return rc;
+ }
+
+ /* keeps the register in good state */
+ regmap_update_bits(pon->regmap,
+ pon->baseaddr + PON_WARM_RESET_REASON1,
+ ~0, 0);
+ return 0;
+}
+
static int pm8916_pon_probe(struct platform_device *pdev)
{
struct pm8916_pon *pon;
- int error;
+ int error, index;
+ unsigned int val, cold_boot;
+ u16 poff_sts = 0;
+ u8 buf[2];
pon = devm_kzalloc(&pdev->dev, sizeof(*pon), GFP_KERNEL);
if (!pon)
@@ -75,6 +154,49 @@ static int pm8916_pon_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, pon);
+ error = pm8916_pon_store_and_clear_warm_reset(pon);
+ if (error)
+ dev_err(pon->dev,
+ "Unable to store/clear WARM_RESET_REASONx registers\n");
+
+ /* PON reason */
+ error = regmap_read(pon->regmap, pon->baseaddr + PON_REASON1, &val);
+ if (error < 0)
+ dev_err(pon->dev, "read power on reason register failed\n");
+
+ index = ffs(val) - 1;
+ cold_boot = !(pon->warm_reset_reason1
+ || (pon->warm_reset_reason2 & PON_WARM_RESET_TFT));
+ if (index >= ARRAY_SIZE(pm8916_pon_reason) || index < 0) {
+ dev_info(pon->dev,
+ "PMIC Power-on reason: Unknown and '%s' boot\n",
+ cold_boot ? "cold" : "warm");
+ } else {
+ pon->pon_trigger_reason = index;
+ dev_info(pon->dev,
+ "PMIC Power-on reason: %s and '%s' boot\n",
+ pm8916_pon_reason[index],
+ cold_boot ? "cold" : "warm");
+ }
+
+ /* POFF reason */
+ error = regmap_bulk_read(pon->regmap,
+ pon->baseaddr + POFF_REASON1,
+ &buf[0], 2);
+ if (error) {
+ dev_err(pon->dev, "Unable to read POFF_RESASON regs\n");
+ return error;
+ }
+ poff_sts = buf[0] | (buf[1] << 8);
+ index = ffs(poff_sts) - 1;
+ if (index >= ARRAY_SIZE(pm8916_poff_reason) || index < 0) {
+ dev_info(pon->dev, "PMIC: Unknown power-off reason\n");
+ } else {
+ pon->pon_power_off_reason = index;
+ dev_info(pon->dev, "PMIC: Power-off reason: %s\n",
+ pm8916_poff_reason[index]);
+ }
+
return devm_of_platform_populate(&pdev->dev);
}
--
2.25.1
