drm/dp/mst: move GUID storage from mgr, port to only mst branch

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[ Upstream commit 5e93b8208d ]

Previous implementation does not handle case below: boot up one MST branch
to DP connector of ASIC. After boot up, hot plug 2nd MST branch to DP output
of 1st MST, GUID is not created for 2nd MST branch. When downstream port of
2nd MST branch send upstream request, it fails because 2nd MST branch GUID
is not available.

New Implementation: only create GUID for MST branch and save it within Branch.

Signed-off-by: Hersen Wu <hersenxs.wu@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Cc: stable@vger.kernel.org
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>

...

This commit is contained in:

Hersen Wu 2016-01-22 17:07:28 -05:00 • committed by Sasha Levin

parent 1505f5ae8a

commit 11dd4e27c5

2 changed files with 38 additions and 51 deletions

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64

drivers/gpu/drm/drm_dp_mst_topology.c

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25

include/drm/drm_dp_mst_helper.h

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