Messages in this thread Patch in this message | | | From | Ramneek Mehresh <> | Subject | [PATCH 8/8][v2]usb:fsl:otg: Add host-gadget drv sync delay | Date | Wed, 15 Jul 2015 17:32:52 +0530 |
| |
Resolve synchronization issue between host and gadget drivers upon role-reversal.
Signed-off-by: Ramneek Mehresh <ramneek.mehresh@freescale.com> Reviewed-by: Li Yang-R58472 <LeoLi@freescale.com> Reviewed-by: Fleming Andrew-AFLEMING <AFLEMING@freescale.com> Tested-by: Fleming Andrew-AFLEMING <AFLEMING@freescale.com> --- drivers/usb/phy/phy-fsl-usb.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/phy/phy-fsl-usb.c b/drivers/usb/phy/phy-fsl-usb.c index 689516d..5d678ea 100644 --- a/drivers/usb/phy/phy-fsl-usb.c +++ b/drivers/usb/phy/phy-fsl-usb.c @@ -544,8 +544,18 @@ int fsl_otg_start_gadget(struct otg_fsm *fsm, int on) dev = otg->gadget->dev.parent; if (on) { - if (dev->driver->resume) + /* + * Delay gadget resume to synchronize between host and gadget + * drivers. Upon role-reversal host drv is shutdown by kernel + * worker thread. By the time host drv shuts down, controller + * gets programmed for gadget role. Shutting host drv after + * this results in controller getting reset, and it stops + * responding to otg events + */ + if (dev->driver->resume) { + msleep(1000); dev->driver->resume(dev); + } } else { if (dev->driver->suspend) dev->driver->suspend(dev, otg_suspend_state); -- 1.8.3.1
| |