[PATCH 11/12] USB: chipidea: re-order irq handling to avoid unhandled irq
From: Richard Zhao <hidden>
Date: 2012-07-12 07:01:51
Subsystem:
chipidea usb high speed dual role controller, the rest, usb subsystem · Maintainers:
Peter Chen, Linus Torvalds, Greg Kroah-Hartman
- let role driver handle irq before ID change check. It give the role driver a chance to handle disconnect. - disable irq during switch role. No role driver to handle irq in the period. Signed-off-by: Richard Zhao <redacted> --- drivers/usb/chipidea/core.c | 21 +++++++++++++-------- 1 file changed, 13 insertions(+), 8 deletions(-)
diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
index 7485c84..0942b9b 100644
--- a/drivers/usb/chipidea/core.c
+++ b/drivers/usb/chipidea/core.c@@ -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);
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1.7.9.5