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power: qpnp-fg: reduce the latency in suspend/resume

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Currently, when the SW based Rbias control is enabled, we cancel
and schedule the delayed work to update sram data and temperature
data in the resume path. That can add up the delay in the resume
path as the cancel_delayed_work_sync will wait for the work to
complete which involves accessing the fuel gauge memory. Cancel
the delayed work to update sram data and temperature data in the
suspend path so that the delay would get reduced in the resume path.

Since Rbias is turned off by update_temp_data every time after the
temperature is updated, stop doing it again in the suspend path.

Change-Id: I148f1e5a9ddc8736952910cd2756ed3ca635bc3f
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>
This commit is contained in:
Subbaraman Narayanamurthy 2014-11-25 11:54:11 -08:00
parent fd7e6316ab
commit 15a0a4d944
1 changed files with 3 additions and 25 deletions
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28
drivers/power/qpnp-fg.c
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@ -1272,6 +1272,7 @@ wait:
get_current_time(&chip->last_temp_update_time);
out:
if (chip->sw_rbias_ctrl) {
rc = fg_mem_masked_write(chip, EXTERNAL_SENSE_SELECT,
BATT_TEMP_CNTRL_MASK,
@ -1280,7 +1281,6 @@ wait:
if (rc)
pr_err("failed to write BATT_TEMP_OFF rc=%d\n", rc);
}
out:
schedule_delayed_work(
&chip->update_temp_work,
msecs_to_jiffies(TEMP_PERIOD_UPDATE_MS));
@ -2829,7 +2829,6 @@ static void check_and_update_sram_data(struct fg_chip *chip)
else
time_left = 0;
cancel_delayed_work_sync(&chip->update_temp_work);
schedule_delayed_work(
&chip->update_temp_work, msecs_to_jiffies(time_left * 1000));
@ -2841,7 +2840,6 @@ static void check_and_update_sram_data(struct fg_chip *chip)
else
time_left = 0;
cancel_delayed_work_sync(&chip->update_sram_data);
schedule_delayed_work(
&chip->update_sram_data, msecs_to_jiffies(time_left * 1000));
}
@ -2849,28 +2847,12 @@ static void check_and_update_sram_data(struct fg_chip *chip)
static int fg_suspend(struct device *dev)
{
struct fg_chip *chip = dev_get_drvdata(dev);
ktime_t enter_time;
ktime_t total_time;
int total_time_ms;
int rc;
if (!chip->sw_rbias_ctrl)
return 0;
enter_time = ktime_get();
rc = fg_mem_masked_write(chip, EXTERNAL_SENSE_SELECT,
BATT_TEMP_CNTRL_MASK,
BATT_TEMP_OFF,
BATT_TEMP_OFFSET);
if (rc)
pr_err("failed to write to memif rc=%d\n", rc);
total_time = ktime_sub(ktime_get(), enter_time);
total_time_ms = ktime_to_ms(total_time);
if ((total_time_ms > 1500) && (fg_debug_mask & FG_STATUS))
pr_info("spent %dms configuring rbias\n",
total_time_ms);
cancel_delayed_work_sync(&chip->update_temp_work);
cancel_delayed_work_sync(&chip->update_sram_data);
return 0;
}
@ -2882,10 +2864,6 @@ static int fg_resume(struct device *dev)
if (!chip->sw_rbias_ctrl)
return 0;
/*
* this may fail, but current time should be still 0,
* triggering an immediate update.
*/
check_and_update_sram_data(chip);
return 0;
}