> From: Greg KH [mailto:gregkh@xxxxxxxxxxxxxxxxxxx] > Sent: Wednesday, February 05, 2014 11:36 AM > > On Tue, Feb 04, 2014 at 03:19:40PM -0800, Paul Zimmerman wrote: > > From: Dinh Nguyen <dinguyen@xxxxxxxxxx> > > > > According to the spec for the DWC2 controller, when the PRTINT interrupt fires, > > the application must clear the appropriate status bit in the Host Port Control > > and Status register to clear this bit. > > > > When disconnecting an A-cable when the dwc2 host driver, the PRTINT fires, but > > only the GINTSTS_PRTINT status is cleared, no action is done with the HPRT0 > > register. The HPRT0_ENACHG bit in the HPRT0 must also be poked to correctly > > clear the GINTSTS_PRTINT interrupt. > > > > I am seeing this behavoir on v2.93 of the DWC2 IP. When I disconnect an OTG > > A-cable adapter, the PRTINT interrupt fires when the DWC2 is in device mode > > and is never cleared. > > > > This patch adds the function to read the HPRT0 register when the PRTINT fires > > and the dwc2 IP has already transitioned to device mode. This function is only > > clearing the HPRT0_ENACHG bit for now, but can be modified to handle more. > > > > Signed-off-by: Dinh Nguyen <dinguyen@xxxxxxxxxx> > > [ paulz: modified patch to preserve HPRT0_ENA bit ] > > Signed-off-by: Paul Zimmerman <paulz@xxxxxxxxxxxx> > > --- > > drivers/usb/dwc2/core_intr.c | 25 ++++++++++++++++++++++--- > > 1 file changed, 22 insertions(+), 3 deletions(-) > > Is this a 3.14 or 3.15 patch? It's not fixing a regression, so 3.15 I would think. -- Paul -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
