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power: pm8921-charger: vote D0 when running kickstart

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There is a small window when the PMIC could lock up while
running the kickstart routine. If PMIC sleeps right while
kickstart is run, it causes a short sleep which is known
to cause PMIC locksup.

To prevent these, specifically vote for D0 clock while
running kickstart which guarantees that the PMIC will not
sleep.

Change-Id: I9ea27ef73098d0ec5e8391352ee005d8a78daa9a
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>
This commit is contained in:
Abhijeet Dharmapurikar
2013-07-16 20:25:20 -07:00
parent 3c0cccf93d
commit 12faeed4ea
1 changed files with 7 additions and 0 deletions
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drivers/power/pm8921-charger.c
+7
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@@ -298,6 +298,7 @@ struct pm8921_chg_chip {
bool disable_aicl;
int usb_type;
bool disable_chg_rmvl_wrkarnd;
struct msm_xo_voter *voter;
};
/* user space parameter to limit usb current */
@@ -4034,6 +4035,7 @@ static void pm8921_chg_force_19p2mhz_clk(struct pm8921_chg_chip *chip)
int err;
u8 temp;
msm_xo_mode_vote(chip->voter, MSM_XO_MODE_ON);
temp = 0xD1;
err = pm_chg_write(chip, CHG_TEST, temp);
if (err) {
@@ -4092,6 +4094,8 @@ static void pm8921_chg_force_19p2mhz_clk(struct pm8921_chg_chip *chip)
pr_err("Error %d writing %d to addr %d\n", err, temp, CHG_TEST);
return;
}
msm_xo_mode_vote(chip->voter, MSM_XO_MODE_OFF);
}
static void pm8921_chg_set_hw_clk_switching(struct pm8921_chg_chip *chip)
@@ -4099,6 +4103,7 @@ static void pm8921_chg_set_hw_clk_switching(struct pm8921_chg_chip *chip)
int err;
u8 temp;
msm_xo_mode_vote(chip->voter, MSM_XO_MODE_ON);
temp = 0xD1;
err = pm_chg_write(chip, CHG_TEST, temp);
if (err) {
@@ -4112,6 +4117,7 @@ static void pm8921_chg_set_hw_clk_switching(struct pm8921_chg_chip *chip)
pr_err("Error %d writing %d to addr %d\n", err, temp, CHG_TEST);
return;
}
msm_xo_mode_vote(chip->voter, MSM_XO_MODE_OFF);
}
#define VREF_BATT_THERM_FORCE_ON BIT(7)
@@ -4800,6 +4806,7 @@ static int __devinit pm8921_charger_probe(struct platform_device *pdev)
chip->ibatmax_max_adj_ma = find_ibat_max_adj_ma(
chip->max_bat_chg_current);
chip->voter = msm_xo_get(MSM_XO_TCXO_D0, "pm8921_charger");
rc = pm8921_chg_hw_init(chip);
if (rc) {
pr_err("couldn't init hardware rc=%d\n", rc);