linux-kernel - [PATCH 3.16 064/212] power: supply: bq24190_charger: Handle fault before status on interrupt

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Date:   Thu, 01 Jun 2017 16:43:15 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Tony Lindgren" <tony@...mide.com>,
        "Mark Greer" <mgreer@...malcreek.com>,
        "Liam Breck" <kernel@...workimprov.net>,
        "Sebastian Reichel" <sre@...nel.org>,
        "Liam Breck" <liam@...workimprov.net>
Subject: [PATCH 3.16 064/212] power: supply: bq24190_charger: Handle fault
 before status on interrupt

3.16.44-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Liam Breck <liam@...workimprov.net>

commit ba52e75718784fda1b683ee0bfded72a0b83b047 upstream.

Reading both fault and status registers and logging any fault should
take priority over handling status register update.

Fix by moving the status handling to later in interrupt routine.

Fixes: d7bf353fd0aa3 ("bq24190_charger: Add support for TI BQ24190 Battery Charger")
Signed-off-by: Liam Breck <kernel@...workimprov.net>
Acked-by: Mark Greer <mgreer@...malcreek.com>
Acked-by: Tony Lindgren <tony@...mide.com>
Signed-off-by: Sebastian Reichel <sre@...nel.org>
[bwh: Backported to 3.16: adjust filename]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/power/bq24190_charger.c | 46 +++++++++++++++++-----------------
 1 file changed, 23 insertions(+), 23 deletions(-)

--- a/drivers/power/bq24190_charger.c
+++ b/drivers/power/bq24190_charger.c
@@ -1185,29 +1185,6 @@ static irqreturn_t bq24190_irq_handler_t
 		goto out;
 	}
 
-	if (ss_reg != bdi->ss_reg) {
-		/*
-		 * The device is in host mode so when PG_STAT goes from 1->0
-		 * (i.e., power removed) HIZ needs to be disabled.
-		 */
-		if ((bdi->ss_reg & BQ24190_REG_SS_PG_STAT_MASK) &&
-				!(ss_reg & BQ24190_REG_SS_PG_STAT_MASK)) {
-			ret = bq24190_write_mask(bdi, BQ24190_REG_ISC,
-					BQ24190_REG_ISC_EN_HIZ_MASK,
-					BQ24190_REG_ISC_EN_HIZ_SHIFT,
-					0);
-			if (ret < 0)
-				dev_err(bdi->dev, "Can't access ISC reg: %d\n",
-					ret);
-		}
-
-		if ((bdi->ss_reg & battery_mask_ss) != (ss_reg & battery_mask_ss))
-			alert_battery = true;
-		if ((bdi->ss_reg & ~battery_mask_ss) != (ss_reg & ~battery_mask_ss))
-			alert_charger = true;
-		bdi->ss_reg = ss_reg;
-	}
-
 	i = 0;
 	do {
 		ret = bq24190_read(bdi, BQ24190_REG_F, &f_reg);
@@ -1234,6 +1211,29 @@ static irqreturn_t bq24190_irq_handler_t
 		mutex_unlock(&bdi->f_reg_lock);
 	}
 
+	if (ss_reg != bdi->ss_reg) {
+		/*
+		 * The device is in host mode so when PG_STAT goes from 1->0
+		 * (i.e., power removed) HIZ needs to be disabled.
+		 */
+		if ((bdi->ss_reg & BQ24190_REG_SS_PG_STAT_MASK) &&
+				!(ss_reg & BQ24190_REG_SS_PG_STAT_MASK)) {
+			ret = bq24190_write_mask(bdi, BQ24190_REG_ISC,
+					BQ24190_REG_ISC_EN_HIZ_MASK,
+					BQ24190_REG_ISC_EN_HIZ_SHIFT,
+					0);
+			if (ret < 0)
+				dev_err(bdi->dev, "Can't access ISC reg: %d\n",
+					ret);
+		}
+
+		if ((bdi->ss_reg & battery_mask_ss) != (ss_reg & battery_mask_ss))
+			alert_battery = true;
+		if ((bdi->ss_reg & ~battery_mask_ss) != (ss_reg & ~battery_mask_ss))
+			alert_charger = true;
+		bdi->ss_reg = ss_reg;
+	}
+
 	if (alert_charger)
 		power_supply_changed(&bdi->charger);
 	if (alert_battery)