drm/mst: Support simultaneous down replies

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Currently we have one down reply message servicing the mst manager, so
we need to serialize all tx msgs to ensure we only have one message in
flight at a time. For obvious reasons this is suboptimal (but less
suboptimal than the free-for-all we had before serialization).

This patch removes the single down_rep_recv message from manager and
adds 2 replies in the branch structure. The 2 replies mirrors the tx_slots
which we use to rate-limit outgoing messages and correspond to seqno in
the packet headers.

Cc: Wayne Lin <Wayne.Lin@amd.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Wayne Lin <waynelin@amd.com>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200213211523.156998-3-sean@poorly.run

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This commit is contained in:

Sean Paul 2020-02-13 16:15:19 -05:00

parent 21a729d007

commit fbc821c4a5

2 changed files with 78 additions and 61 deletions

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80

drivers/gpu/drm/drm_dp_mst_topology.c

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59

include/drm/drm_dp_mst_helper.h

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