linux-kernel - [PATCH 4.9 019/103] power: supply: bq24190_charger: Handle fault before status on interrupt

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Message-Id: <20170511141212.267797604@linuxfoundation.org>
Date:   Thu, 11 May 2017 16:11:48 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Liam Breck <kernel@...workimprov.net>,
        Mark Greer <mgreer@...malcreek.com>,
        Tony Lindgren <tony@...mide.com>,
        Sebastian Reichel <sre@...nel.org>
Subject: [PATCH 4.9 019/103] power: supply: bq24190_charger: Handle fault before status on interrupt

4.9-stable 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>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/power/supply/bq24190_charger.c |   46 ++++++++++++++++-----------------
 1 file changed, 23 insertions(+), 23 deletions(-)

--- a/drivers/power/supply/bq24190_charger.c
+++ b/drivers/power/supply/bq24190_charger.c
@@ -1175,29 +1175,6 @@ 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);
@@ -1224,6 +1201,29 @@ 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)