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usb: musb: Return error value from musb_mailbox

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At least on n900 we have phy-twl4030-usb only generating cable
interrupts, and then have a separate USB PHY.

In order for musb to know the real cable status, we need to
clear any cached state until musb is ready. Otherwise the cable
status interrupts will get just ignored if the status does
not change from the initial state.

To do this, let's add a return value to musb_mailbox(), and
reset cached linkstat to MUSB_UNKNOWN on error. Sorry to cause
a bit of churn here, I should have added that already last time
patching musb_mailbox().

Signed-off-by: Tony Lindgren <[email protected]>
Signed-off-by: Bin Liu <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Tony Lindgren 2016-05-31 10:05:19 -05:00 • committed by Greg Kroah-Hartman
commit 12b7db2bf8
6 changed files with 32 additions and 16 deletions
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14
drivers/phy/phy-twl4030-usb.c
View file

@ -463,7 +463,8 @@ static int twl4030_phy_power_on(struct phy *phy)
twl4030_usb_set_mode(twl, twl->usb_mode);
if (twl->usb_mode == T2_USB_MODE_ULPI)
twl4030_i2c_access(twl, 0);
schedule_delayed_work(&twl->id_workaround_work, 0);
twl->linkstat = MUSB_UNKNOWN;
schedule_delayed_work(&twl->id_workaround_work, HZ);
return 0;
}
@ -537,6 +538,7 @@ static irqreturn_t twl4030_usb_irq(int irq, void *_twl)
struct twl4030_usb *twl = _twl;
enum musb_vbus_id_status status;
bool status_changed = false;
int err;
status = twl4030_usb_linkstat(twl);
@ -567,7 +569,9 @@ static irqreturn_t twl4030_usb_irq(int irq, void *_twl)
pm_runtime_mark_last_busy(twl->dev);
pm_runtime_put_autosuspend(twl->dev);
}
musb_mailbox(status);
err = musb_mailbox(status);
if (err)
twl->linkstat = MUSB_UNKNOWN;
}
/* don't schedule during sleep - irq works right then */
@ -595,7 +599,8 @@ static int twl4030_phy_init(struct phy *phy)
struct twl4030_usb *twl = phy_get_drvdata(phy);
pm_runtime_get_sync(twl->dev);
schedule_delayed_work(&twl->id_workaround_work, 0);
twl->linkstat = MUSB_UNKNOWN;
schedule_delayed_work(&twl->id_workaround_work, HZ);
pm_runtime_mark_last_busy(twl->dev);
pm_runtime_put_autosuspend(twl->dev);
@ -763,7 +768,8 @@ static int twl4030_usb_remove(struct platform_device *pdev)
if (cable_present(twl->linkstat))
pm_runtime_put_noidle(twl->dev);
pm_runtime_mark_last_busy(twl->dev);
pm_runtime_put_sync_suspend(twl->dev);
pm_runtime_dont_use_autosuspend(&pdev->dev);
pm_runtime_put_sync(twl->dev);
pm_runtime_disable(twl->dev);
/* autogate 60MHz ULPI clock,