lkml.org 
[lkml]   [2020]   [Apr]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    From
    Subject[PATCH 0/4] usb: gadget: serial: add supend resume support
    Date
    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

    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 | 10 ++++--
    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, 90 insertions(+), 11 deletions(-)

    --
    2.7.4

    \
     
     \ /
      Last update: 2020-04-21 14:34    [W:3.315 / U:0.088 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site