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qcom-charger: smblib: lower delay in OTG soft-start check

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Currently, there is a delay of 20msec before raising OTG
current limit, which may be too long for some OTG devices and
cause unexpected issues.

Change it to 1ms or 2ms per HW timing.

Change-Id: Ie09a65e7974e2412af4add3b6f1e0aa20ee4a34b
Signed-off-by: Harry Yang <harryy@codeaurora.org>
This commit is contained in:
Harry Yang 2016-11-01 12:56:36 -07:00
parent e95375540c
commit 87bdf22ad7
1 changed files with 21 additions and 9 deletions
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30
drivers/power/qcom-charger/smb-lib.c
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@ -961,12 +961,13 @@ static int smblib_apsd_disable_vote_callback(struct votable *votable,
* OTG REGULATOR *
*****************/
#define OTG_SOFT_START_DELAY_MS 20
#define MAX_SOFTSTART_TRIES 2
int smblib_vbus_regulator_enable(struct regulator_dev *rdev)
{
struct smb_charger *chg = rdev_get_drvdata(rdev);
u8 stat;
int rc = 0;
int tries = MAX_SOFTSTART_TRIES;
rc = smblib_masked_write(chg, OTG_ENG_OTG_CFG_REG,
ENG_BUCKBOOST_HALT1_8_MODE_BIT,
@ -983,14 +984,25 @@ int smblib_vbus_regulator_enable(struct regulator_dev *rdev)
return rc;
}
msleep(OTG_SOFT_START_DELAY_MS);
rc = smblib_read(chg, OTG_STATUS_REG, &stat);
if (rc < 0) {
smblib_err(chg, "Couldn't read OTG_STATUS_REG rc=%d\n", rc);
return rc;
}
if (stat & BOOST_SOFTSTART_DONE_BIT)
smblib_otg_cl_config(chg, chg->otg_cl_ua);
/* waiting for boost readiness, usually ~1ms, 2ms in worst case */
do {
usleep_range(1000, 1100);
rc = smblib_read(chg, OTG_STATUS_REG, &stat);
if (rc < 0) {
smblib_err(chg, "Couldn't read OTG_STATUS_REG rc=%d\n",
rc);
return rc;
}
if (stat & BOOST_SOFTSTART_DONE_BIT) {
smblib_otg_cl_config(chg, chg->otg_cl_ua);
break;
}
} while (--tries);
if (tries == 0)
smblib_err(chg, "Timeout waiting for boost softstart rc=%d\n",
rc);
return rc;
}