Re: [PATCH AUTOSEL 6.2 18/60] drm/msm/dp: Remove INIT_SETUP delay

[Sasha Levin]

On Mon, Feb 27, 2023 at 10:12:20AM +0100, Johan Hovold wrote:
> On Sun, Feb 26, 2023 at 09:00:03PM -0500, Sasha Levin wrote:
> > From: Bjorn Andersson <quic_bjorande@xxxxxxxxxxx>
> >
> > [ Upstream commit e17af1c9d861dc177e5b56009bd4f71ace688d97 ]
> >
> > During initalization of the DisplayPort controller an EV_HPD_INIT_SETUP
> > event is generated, but with a delay of 100 units. This delay existed to
> > circumvent bug in the QMP combo PHY driver, where if the DP part was
> > powered up before USB, the common properties would not be properly
> > initialized - and USB wouldn't work.
> >
> > This issue was resolved in the recent refactoring of the QMP driver,
> > so it's now possible to remove this delay.
> >
> > While there is still a timing dependency in the current implementation,
> > test indicates that it's now possible to boot with an external display
> > on USB Type-C and have the display power up, without disconnecting and
> > reconnecting the cable.
> >
> > Signed-off-by: Bjorn Andersson <quic_bjorande@xxxxxxxxxxx>
> > Reviewed-by: Kuogee Hsieh <quic_khsieh@xxxxxxxxxxx>
> > Patchwork: https://patchwork.freedesktop.org/patch/518729/
> > Link: https://lore.kernel.org/r/20230117172951.2748456-1-quic_bjorande@xxxxxxxxxxx
> > Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
> > Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
>
> This is not a bug fix and should not be backported.

Ack, I'll drop all the INIT_SETUP patches. Thanks!

--
Thanks,
Sasha