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USB: chipidea: re-order irq handling to avoid unhandled irqs

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- let role driver handle irq before ID change check; this gives the
  role driver a chance to handle disconnect;
- disable irq during switch role; no role driver to handle irq in
  the period.

Tested-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Tested-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Richard Zhao <richard.zhao@freescale.com>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Richard Zhao 2012-09-12 14:58:11 +03:00 committed by Greg Kroah-Hartman
parent 388ed48723
commit b183c19f98
1 changed files with 13 additions and 8 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

21
drivers/usb/chipidea/core.c
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@ -279,6 +279,7 @@ static void ci_role_work(struct work_struct *work)
ci_role_stop(ci);
ci_role_start(ci, role);
enable_irq(ci->irq);
}
}
@ -318,18 +319,22 @@ static irqreturn_t ci_irq(int irq, void *data)
{
struct ci13xxx *ci = data;
irqreturn_t ret = IRQ_NONE;
u32 otgsc = 0;
if (ci->is_otg) {
u32 sts = hw_read(ci, OP_OTGSC, ~0);
if (ci->is_otg)
otgsc = hw_read(ci, OP_OTGSC, ~0);
if (sts & OTGSC_IDIS) {
hw_write(ci, OP_OTGSC, OTGSC_IDIS, OTGSC_IDIS);
queue_work(ci->wq, &ci->work);
ret = IRQ_HANDLED;
}
if (ci->role != CI_ROLE_END)
ret = ci_role(ci)->irq(ci);
if (ci->is_otg && (otgsc & OTGSC_IDIS)) {
hw_write(ci, OP_OTGSC, OTGSC_IDIS, OTGSC_IDIS);
disable_irq_nosync(ci->irq);
queue_work(ci->wq, &ci->work);
ret = IRQ_HANDLED;
}
return ci->role == CI_ROLE_END ? ret : ci_role(ci)->irq(ci);
return ret;
}
static DEFINE_IDA(ci_ida);