[04/13] twl4030_charger: trust phy to determine when USB power is available.
diff mbox

Message ID 20150730001124.4012.85912.stgit@noble
State New
Headers show

Commit Message

NeilBrown July 30, 2015, 12:11 a.m. UTC
The usb phy driver already determines when VBUS is available,
so repeating the test in the charger driver is pointless duplication.

On probe, process the last event from the phy, and from then on,
do whatever the phy tells us without double-checking.

Signed-off-by: NeilBrown <neil@brown.name>
---
 drivers/power/twl4030_charger.c |   33 ++++++---------------------------
 1 file changed, 6 insertions(+), 27 deletions(-)



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Comments

Pavel Machek Sept. 15, 2015, 11:30 a.m. UTC | #1
On Thu 2015-07-30 10:11:24, NeilBrown wrote:
> The usb phy driver already determines when VBUS is available,
> so repeating the test in the charger driver is pointless duplication.
> 
> On probe, process the last event from the phy, and from then on,
> do whatever the phy tells us without double-checking.
> 
> Signed-off-by: NeilBrown <neil@brown.name>

Acked-by: Pavel Machek <pavel@ucw.cz>

Patch
diff mbox

diff --git a/drivers/power/twl4030_charger.c b/drivers/power/twl4030_charger.c
index ffc123fb7158..a075216d65ed 100644
--- a/drivers/power/twl4030_charger.c
+++ b/drivers/power/twl4030_charger.c
@@ -178,28 +178,6 @@  static int twl4030_is_battery_present(struct twl4030_bci *bci)
 }
 
 /*
- * Check if VBUS power is present
- */
-static int twl4030_bci_have_vbus(struct twl4030_bci *bci)
-{
-	int ret;
-	u8 hwsts;
-
-	ret = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &hwsts,
-			      TWL4030_PM_MASTER_STS_HW_CONDITIONS);
-	if (ret < 0)
-		return 0;
-
-	dev_dbg(bci->dev, "check_vbus: HW_CONDITIONS %02x\n", hwsts);
-
-	/* in case we also have STS_USB_ID, VBUS is driven by TWL itself */
-	if ((hwsts & TWL4030_STS_VBUS) && !(hwsts & TWL4030_STS_USB_ID))
-		return 1;
-
-	return 0;
-}
-
-/*
  * Enable/Disable USB Charge functionality.
  */
 static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
@@ -207,10 +185,6 @@  static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
 	int ret;
 
 	if (enable && !IS_ERR_OR_NULL(bci->transceiver)) {
-		/* Check for USB charger connected */
-		if (!twl4030_bci_have_vbus(bci))
-			return -ENODEV;
-
 		/*
 		 * Until we can find out what current the device can provide,
 		 * require a module param to enable USB charging.
@@ -662,7 +636,12 @@  static int twl4030_bci_probe(struct platform_device *pdev)
 		dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
 
 	twl4030_charger_enable_ac(true);
-	twl4030_charger_enable_usb(bci, true);
+	if (!IS_ERR_OR_NULL(bci->transceiver))
+		twl4030_bci_usb_ncb(&bci->usb_nb,
+				    bci->transceiver->last_event,
+				    NULL);
+	else
+		twl4030_charger_enable_usb(bci, false);
 	if (pdata)
 		twl4030_charger_enable_backup(pdata->bb_uvolt,
 					      pdata->bb_uamp);