extcon: axp288: Redo charger type detection a couple of seconds after probe()

The axp288 extcon code depends on other drivers to do things like mux the
data lines, enable/disable vbus based on the id-pin, etc.

Sometimes the BIOS has not set these things up correctly resulting in the
initial charger cable type detection giving a wrong result and we end up
not charging or charging at only 0.5A.

This commit starts a second charger-detection cycle a couple of seconds
after the first one finishes, giving the other drivers time to load and
do their thing.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>

1 files changed, 30 insertions, 2 deletions

diff --git a/drivers/extcon/extcon-axp288.c b/drivers/extcon/extcon-axp288.c
index 1621f2f7f129..74d5be0b1f35 100644
--- a/drivers/extcon/extcon-axp288.c
+++ b/drivers/extcon/extcon-axp288.c
@@ -1,6 +1,7 @@
 /*
  * extcon-axp288.c - X-Power AXP288 PMIC extcon cable detection driver
  *
+ * Copyright (C) 2016-2017 Hans de Goede <hdegoede@redhat.com>
  * Copyright (C) 2015 Intel Corporation
  * Author: Ramakrishna Pallala <ramakrishna.pallala@intel.com>
  *
@@ -97,9 +98,11 @@ struct axp288_extcon_info {
         struct device *dev;
         struct regmap *regmap;
         struct regmap_irq_chip_data *regmap_irqc;
+        struct delayed_work det_work;
         int irq[EXTCON_IRQ_END];
         struct extcon_dev *edev;
         unsigned int previous_cable;
+        bool first_detect_done;
 };
 
 /* Power up/down reason string array */
@@ -137,6 +140,25 @@ static void axp288_extcon_log_rsi(struct axp288_extcon_info *info)
         regmap_write(info->regmap, AXP288_PS_BOOT_REASON_REG, clear_mask);
 }
 
+static void axp288_chrg_detect_complete(struct axp288_extcon_info *info)
+{
+        /*
+         * We depend on other drivers to do things like mux the data lines,
+         * enable/disable vbus based on the id-pin, etc. Sometimes the BIOS has
+         * not set these things up correctly resulting in the initial charger
+         * cable type detection giving a wrong result and we end up not charging
+         * or charging at only 0.5A.
+         *
+         * So we schedule a second cable type detection after 2 seconds to
+         * give the other drivers time to load and do their thing.
+         */
+        if (!info->first_detect_done) {
+                queue_delayed_work(system_wq, &info->det_work,
+                                   msecs_to_jiffies(2000));
+                info->first_detect_done = true;
+        }
+}
+
 static int axp288_handle_chrg_det_event(struct axp288_extcon_info *info)
 {
         int ret, stat, cfg, pwr_stat;
@@ -201,6 +223,8 @@ no_vbus:
                 info->previous_cable = cable;
         }
 
+        axp288_chrg_detect_complete(info);
+
         return 0;
 
 dev_det_ret:
@@ -222,8 +246,11 @@ static irqreturn_t axp288_extcon_isr(int irq, void *data)
         return IRQ_HANDLED;
 }
 
-static void axp288_extcon_enable(struct axp288_extcon_info *info)
+static void axp288_extcon_det_work(struct work_struct *work)
 {
+        struct axp288_extcon_info *info =
+                container_of(work, struct axp288_extcon_info, det_work.work);
+
         regmap_update_bits(info->regmap, AXP288_BC_GLOBAL_REG,
                                                 BC_GLOBAL_RUN, 0);
         /* Enable the charger detection logic */
@@ -245,6 +272,7 @@ static int axp288_extcon_probe(struct platform_device *pdev)
         info->regmap = axp20x->regmap;
         info->regmap_irqc = axp20x->regmap_irqc;
         info->previous_cable = EXTCON_NONE;
+        INIT_DELAYED_WORK(&info->det_work, axp288_extcon_det_work);
 
         platform_set_drvdata(pdev, info);
 
@@ -290,7 +318,7 @@ static int axp288_extcon_probe(struct platform_device *pdev)
         }
 
         /* Start charger cable type detection */
-        axp288_extcon_enable(info);
+        queue_delayed_work(system_wq, &info->det_work, 0);
 
         return 0;
 }