[PATCH 04/15] twl4030_charger: use runtime_pm to keep usb phy active while charging.

NeilBrown
2015-02-24T04:35:49Z

The twl4030 usb phy needs to be active while we are using
the USB VBUS as a current source for charging.
In particular, the usb3v1 regulator must be enabled and the
PHY_PWR_PHYPWD bit must be set to keep the phy powered.

commit ab37813f4093a5f59cb8e083cde277289dc72ed3
twl4030_charger: Allow charger to control the regulator that feeds it

Gave the charger control over the regulator, but didn't resolve
the PHY_PWR_PHYPWD issue.

Now that both of these are controlled by runtime_pm in
phy-twl4030-usb, we can simply take a runtime_pm reference to the USB
phy whenever the charger wants to use it as a current source.

So this patch reverts the above commit, and adds the necessary
runtime_pm calls.

Signed-off-by: NeilBrown <neilb@suse.de>
---
drivers/mfd/twl-core.c | 9 ++++-----
drivers/power/twl4030_charger.c | 18 +++++-------------
2 files changed, 9 insertions(+), 18 deletions(-)

diff --git a/drivers/mfd/twl-core.c b/drivers/mfd/twl-core.c
index 489674a2497e..831696ee2472 100644
--- a/drivers/mfd/twl-core.c
+++ b/drivers/mfd/twl-core.c
@@ -788,9 +788,8 @@ add_children(struct twl4030_platform_data *pdata, unsigned irq_base,
static struct regulator_consumer_supply usb1v8 = {
.supply = "usb1v8",
};
- static struct regulator_consumer_supply usb3v1[] = {
- { .supply = "usb3v1" },
- { .supply = "bci3v1" },
+ static struct regulator_consumer_supply usb3v1 = {
+ .supply = "usb3v1",
};

/* First add the regulators so that they can be used by transceiver */
@@ -818,7 +817,7 @@ add_children(struct twl4030_platform_data *pdata, unsigned irq_base,
return PTR_ERR(child);

child = add_regulator_linked(TWL4030_REG_VUSB3V1,
- &usb_fixed, usb3v1, 2,
+ &usb_fixed, &usb3v1, 1,
features);
if (IS_ERR(child))
return PTR_ERR(child);
@@ -838,7 +837,7 @@ add_children(struct twl4030_platform_data *pdata, unsigned irq_base,
if (IS_ENABLED(CONFIG_REGULATOR_TWL4030) && child) {
usb1v5.dev_name = dev_name(child);
usb1v8.dev_name = dev_name(child);
- usb3v1[0].dev_name = dev_name(child);
+ usb3v1.dev_name = dev_name(child);
}
}

diff --git a/drivers/power/twl4030_charger.c b/drivers/power/twl4030_charger.c
index 51321f0c5548..11f352a5ef55 100644
--- a/drivers/power/twl4030_charger.c
+++ b/drivers/power/twl4030_charger.c
@@ -22,7 +22,6 @@
#include <linux/power_supply.h>
#include <linux/notifier.h>
#include <linux/usb/otg.h>
-#include <linux/regulator/machine.h>

#define TWL4030_BCIMSTATEC 0x02
#define TWL4030_BCIICHG 0x08
@@ -94,7 +93,6 @@ struct twl4030_bci {
struct work_struct work;
int irq_chg;
int irq_bci;
- struct regulator *usb_reg;
int usb_enabled;

unsigned long event;
@@ -208,7 +206,7 @@ static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
{
int ret;

- if (enable) {
+ if (enable && !IS_ERR_OR_NULL(bci->transceiver)) {
/* Check for USB charger connected */
if (!twl4030_bci_have_vbus(bci))
return -ENODEV;
@@ -222,14 +220,9 @@ static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
return -EACCES;
}

- /* Need to keep regulator on */
+ /* Need to keep phy powered */
if (!bci->usb_enabled) {
- ret = regulator_enable(bci->usb_reg);
- if (ret) {
- dev_err(bci->dev,
- "Failed to enable regulator\n");
- return ret;
- }
+ pm_runtime_get_sync(bci->transceiver->dev);
bci->usb_enabled = 1;
}

@@ -244,7 +237,8 @@ static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
} else {
ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0);
if (bci->usb_enabled) {
- regulator_disable(bci->usb_reg);
+ pm_runtime_mark_last_busy(bci->transceiver->dev);
+ pm_runtime_put_autosuspend(bci->transceiver->dev);
bci->usb_enabled = 0;
}
}
@@ -602,8 +596,6 @@ static int __init twl4030_bci_probe(struct platform_device *pdev)
bci->usb.num_properties = ARRAY_SIZE(twl4030_charger_props);
bci->usb.get_property = twl4030_bci_get_property;

- bci->usb_reg = regulator_get(bci->dev, "bci3v1");
-
ret = devm_power_supply_register(&pdev->dev, &bci->usb);
if (ret) {
dev_err(&pdev->dev, "failed to register usb: %d\n", ret);