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bif: qpnp-bsi: disable BSI during master-disabled bus state 

Disable the BSI PMIC peripheral when the bus state is changed
to master-disabled.  This can be used to save power when no
smart battery pack is detect.

Change-Id: Ic0ce8c11153a6bfa32e4661bf8d791265ebf4f95
Signed-off-by: David Collins <collinsd@codeaurora.org>
This commit is contained in:
David Collins 2013-09-12 13:13:22 -07:00
parent 07ca70b06a
commit 10714d01ef
1 changed files with 25 additions and 12 deletions
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37
drivers/bif/qpnp-bsi.c
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@ -1162,6 +1162,7 @@ static int qpnp_bsi_bus_set_active_mode(struct bif_ctrl_dev *bdev,
+ QPNP_BSI_POWER_UP_LOW_DELAY_US);
break;
case BIF_BUS_STATE_POWER_DOWN:
case BIF_BUS_STATE_MASTER_DISABLED:
msleep(QPNP_BSI_MAX_SLAVE_POWER_UP_DELAY_MS);
break;
}
@ -1180,13 +1181,34 @@ static int qpnp_bsi_set_bus_state(struct bif_ctrl_dev *bdev, int state)
{
struct qpnp_bsi_chip *chip = bdev_get_drvdata(bdev);
int rc = 0;
u8 reg;
if (state == chip->state)
return 0;
if (chip->state == BIF_BUS_STATE_MASTER_DISABLED) {
/*
* Enable the BSI peripheral when transitioning from a disabled
* bus state to any of the active bus states so that BIF
* transactions can take place.
*/
reg = QPNP_BSI_ENABLE;
rc = qpnp_bsi_write(chip, QPNP_BSI_REG_ENABLE, &reg, 1);
if (rc) {
dev_err(&chip->spmi_dev->dev, "%s: qpnp_bsi_write() failed, rc=%d\n",
__func__, rc);
return rc;
}
}
switch (state) {
case BIF_BUS_STATE_MASTER_DISABLED:
pr_info("master disable not yet supported.\n");
/* Disable the BSI peripheral. */
reg = QPNP_BSI_DISABLE;
rc = qpnp_bsi_write(chip, QPNP_BSI_REG_ENABLE, &reg, 1);
if (rc)
dev_err(&chip->spmi_dev->dev, "%s: qpnp_bsi_write() failed, rc=%d\n",
__func__, rc);
break;
case BIF_BUS_STATE_POWER_DOWN:
rc = qpnp_bsi_bus_transaction(bdev, BIF_TRANS_BC, BIF_CMD_PDWN);
@ -1624,7 +1646,7 @@ static int qpnp_bsi_probe(struct spmi_device *spmi)
struct device *dev = &spmi->dev;
struct qpnp_bsi_chip *chip;
int rc;
u8 type[2], reg;
u8 type[2];
if (!spmi->dev.of_node) {
dev_err(dev, "%s: device node missing\n", __func__);
@ -1655,7 +1677,7 @@ static int qpnp_bsi_probe(struct spmi_device *spmi)
chip->spmi_dev = spmi;
chip->bdesc.ops = &qpnp_bsi_ops;
chip->state = BIF_BUS_STATE_POWER_DOWN;
chip->state = BIF_BUS_STATE_MASTER_DISABLED;
chip->com_mode = QPNP_BSI_COM_MODE_IRQ;
rc = qpnp_bsi_read(chip, QPNP_BSI_REG_TYPE, type, 2);
@ -1691,15 +1713,6 @@ static int qpnp_bsi_probe(struct spmi_device *spmi)
goto cleanup_irqs;
}
/* Enable the BSI module. */
reg = QPNP_BSI_ENABLE;
rc = qpnp_bsi_write(chip, QPNP_BSI_REG_ENABLE, &reg, 1);
if (rc) {
dev_err(dev, "%s: qpnp_bsi_write() failed, rc=%d\n",
__func__, rc);
goto cleanup_irqs;
}
chip->bdev = bif_ctrl_register(&chip->bdesc, dev, chip,
spmi->dev.of_node);
if (IS_ERR(chip->bdev)) {