[Intel-gfx] [PATCH 2/2] drm/dp: Wait up all outstanding tx waiters

[Jani Nikula]

On Mon, 15 May 2017, Daniel Vetter <daniel at ffwll.ch> wrote:
> On Mon, May 15, 2017 at 03:33:12PM +0300, Ville Syrjälä wrote:
>> On Mon, May 15, 2017 at 02:04:43PM +0200, Daniel Vetter wrote:
>> > On Sat, May 13, 2017 at 11:52:01AM +0100, Chris Wilson wrote:
>> > > As we can have multiple tx in the queue, with individual waiters, make
>> > > sure that all are woken when any state changes (so that we are sure the
>> > > right owner of the txmsg is woken).
>> > > 
>> > > Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
>> > 
>> > I think in practice we need probe vs. the userspace dp aux interface (or
>> > multiple userspace apps beating on this), and on multiple different mst
>> > sinks, but better safe than sorry.
>> 
>> Someone has to figure out what I did wrong in my remote DPCD aux_dev
>> attempt before we can actually do that:
>> 
>> [1] git://github.com/vsyrjala/linux.git dp_mst_port_aux_dev
>
> Oh, I didn't realize we don't register the full dp aux for remotes. But we
> do register the i2c for remotes, and that's good enough to blow up. i2c
> dev nodes is also more likely to be used by userspace for real (through
> the ddc tool).

Related https://bugs.freedesktop.org/show_bug.cgi?id=100954

BR,
Jani.


-- 
Jani Nikula, Intel Open Source Technology Center