1. Forum
  2. Usenet
  3. LINUX.KERNEL

  • [PATCH] HID: hid-multitouch: forward MSC_TIMESTAMP

    From Jiri Kosina@21:1/5 to Nicolas Boichat on Mon Oct 2 14:40:02 2017
    On Tue, 22 Aug 2017, Nicolas Boichat wrote:

    Computes and forwards the device timestamp according to the
    specification.

    Many devices use a 16-bit timestamp field, with a resolution
    of 100us, therefore rolling around very frequently (every
    6.5 seconds). To make sure there is no ambiguity, the
    timestamp reported to the input stack reset to 0 whenever
    the time between 2 received events is greater than
    MAX_TIMESTAMP_INTERVAL (1 second).

    Signed-off-by: Nicolas Boichat <drinkcat@chromium.org>

    ---

    Inspired from Benjamin Tissoires's patch here: https://patchwork.kernel.org/patch/1742181/, and changing the
    logic to resynchronize the timestamps to use received time
    instead of a potentially more fragile difference between
    the 2 deltas.

    Benjamin, any objections on merging this one for 4.15? I like it.

    Thanks,

    --
    Jiri Kosina
    SUSE Labs

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Benjamin Tissoires@21:1/5 to Jiri Kosina on Mon Oct 2 15:10:02 2017
    On Oct 02 2017 or thereabouts, Jiri Kosina wrote:
    On Tue, 22 Aug 2017, Nicolas Boichat wrote:

    Computes and forwards the device timestamp according to the
    specification.

    Many devices use a 16-bit timestamp field, with a resolution
    of 100us, therefore rolling around very frequently (every
    6.5 seconds). To make sure there is no ambiguity, the
    timestamp reported to the input stack reset to 0 whenever
    the time between 2 received events is greater than
    MAX_TIMESTAMP_INTERVAL (1 second).

    Signed-off-by: Nicolas Boichat <drinkcat@chromium.org>

    ---

    Inspired from Benjamin Tissoires's patch here: https://patchwork.kernel.org/patch/1742181/, and changing the
    logic to resynchronize the timestamps to use received time
    instead of a potentially more fragile difference between
    the 2 deltas.

    Benjamin, any objections on merging this one for 4.15? I like it.


    No objections from my side.

    Acked-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>

    Cheers,
    Benjamin

    Thanks,

    --
    Jiri Kosina
    SUSE Labs


    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)