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
