This series handles an issue seen when doing basic testing using ACM or SERIAL gadget functions like in [1], and using the DWC2 gadget driver. It occurs when the HOST has suspended the bus before testing, in this order: - On the device: cat /dev/ttyGS<Y> Dmesg error log is seen on device side: configfs-gadget gadget: acm ttyGS0 can't notify serial state, -11 - On the host: echo test > /dev/ttyACM<X> The bus resumes, but the serial link isn't functional. So, implement suspend/resume callbacks in gadget serial drivers to handle this. There is a precursor patch in DWC2 to enable submitting usb requests from the gadget resume routine, once in L0 state. [1] https://www.kernel.org/doc/html/latest/usb/gadget-testing.html#testing-the-acm-function Changes in v2: - update dwc2 with Minas suggestions Fabrice Gasnier (4): usb: dwc2: gadget: move gadget resume after the core is in L0 state usb: gadget: u_serial: add suspend resume callbacks usb: gadget: f_serial: add suspend resume callbacks usb: gadget: f_acm: add suspend resume callbacks drivers/usb/dwc2/core_intr.c | 7 +++-- drivers/usb/gadget/function/f_acm.c | 16 ++++++++++ drivers/usb/gadget/function/f_serial.c | 16 ++++++++++ drivers/usb/gadget/function/u_serial.c | 57 +++++++++++++++++++++++++++++----- drivers/usb/gadget/function/u_serial.h | 2 ++ 5 files changed, 88 insertions(+), 10 deletions(-) -- 2.7.4
