The following patch series addresses the core reset and force mode delay problems seen on some platforms. It is basically the same as this series of patches sent earlier this year: http://marc.info/?l=linux-usb&m=145921907525708&w=2 Except the first patch is omitted (already upstream) and the last patch is broken up into two patches. This series is trying to account for a variable delay from the IDDIG debounce filter when switching modes. This delay is a function of the PHY clock speed and can range from 5-50 ms. This delay must be taken into account on core reset and force modes. A full explanation is provided in the patch commit log and code comments. Patch 1 is a prerequisite to this fix. Patch 2 implements the delay for core reset. Patch 3 implements the delay for set/clear force modes. Patch 4 makes further optimizations to remove unnecessary calls to reset and force mode and avoid extra delays in the driver. RK3188 platforms: Michael Niewoehner reported problems with the previous set of patches that I suspect have to do with the last patch of this series. On Raspberry PI platforms: Stefan Wahren reported problems that should be solved by patches 1-3 of this series. Appreciate testing on these and any other platforms. Patch 1-2 can probably be merged right now as they shouldn't break anything. Patch 3 should solve the RPI problems and shouldn't have any issues on rk3188 either. Patch 4 likely will have the same issue as with rk3188 and will need to be investigated at a later time. Regards, John John Youn (4): usb: dwc2: gadget: Only initialize device if in device mode usb: dwc2: Add delay to core soft reset usb: dwc2: Properly account for the force mode delays usb: dwc2: Force mode optimizations drivers/usb/dwc2/core.c | 195 ++++++++++++++++++++++++++++---------------- drivers/usb/dwc2/core.h | 2 +- drivers/usb/dwc2/gadget.c | 7 +- drivers/usb/dwc2/hcd.c | 6 +- drivers/usb/dwc2/hw.h | 1 + drivers/usb/dwc2/platform.c | 9 +- 6 files changed, 143 insertions(+), 77 deletions(-) -- 2.9.0 -- 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
