Revert "ACPI / battery: fix wrong value of capacity_now reported when fully charged"

This reverts commit 232de5143790 ("ACPI / battery: fix wrong value of
capacity_now reported when fully charged")

There is nothing wrong or unexpected about 'capacity_now' increasing above
the last 'full_charge_capacity' value. Different charging cycles will cause
'full_charge_capacity' to vary, both up and down.  Good battery firmwares
will update 'full_charge_capacity' when the current charging cycle is
complete, increasing it if necessary. It might even go above
'design_capacity' on a fresh and healthy battery.

Capping 'capacity_now' to 'full_charge_capacity' is plain wrong, and
printing a warning if this doesn't happen to match the 'design_capacity'
is both annoying and terribly wrong.

This results in bogus warnings on perfectly working systems/firmwares:

 [Firmware Bug]: battery: reported current charge level (39800) is higher than reported maximum charge level (39800).

and wrong values being reported for 'capacity_now' and
'full_charge_capacity' after the warning has been triggered.

Fixes: 232de5143790 ("ACPI / battery: fix wrong value of capacity_now reported when fully charged")
Cc: 3.16+ <stable@vger.kernel.org> # 3.16+
Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c
index 48bcf38..5fdfe65 100644 (file)
--- a/drivers/acpi/battery.c
+++ b/drivers/acpi/battery.c
@@ -534,20 +534,6 @@ static int acpi_battery_get_state(struct acpi_battery *battery)
                        " invalid.\n");
        }
 
-       /*
-        * When fully charged, some batteries wrongly report
-        * capacity_now = design_capacity instead of = full_charge_capacity
-        */
-       if (battery->capacity_now > battery->full_charge_capacity
-           && battery->full_charge_capacity != ACPI_BATTERY_VALUE_UNKNOWN) {
-               battery->capacity_now = battery->full_charge_capacity;
-               if (battery->capacity_now != battery->design_capacity)
-                       printk_once(KERN_WARNING FW_BUG
-                               "battery: reported current charge level (%d) "
-                               "is higher than reported maximum charge level (%d).\n",
-                               battery->capacity_now, battery->full_charge_capacity);
-       }
-
        if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)
            && battery->capacity_now >= 0 && battery->capacity_now <= 100)
                battery->capacity_now = (battery->capacity_now *