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drm/amd/display: Only revalidate bandwidth on medium and fast updates

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commit 6eb3cf2e06 upstream.

[Why]
Changes that are fast don't require updating DLG parameters making
this call unnecessary. Considering this is an expensive call it should
not be done on every flip.

DML touches clocks, p-state support, DLG params and a few other DC
internal flags and these aren't expected during fast. A hang has been
reported with this change when called on every flip which suggests that
modifying these fields is not recommended behavior on fast updates.

[How]
Guard the validation to only happen if update type isn't FAST.

Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1191
Fixes: a24eaa5c51 ("drm/amd/display: Revalidate bandwidth before commiting DC updates")
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Roman Li <Roman.Li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Nicholas Kazlauskas
2020-06-29 13:03:52 -04:00
committed by Greg Kroah-Hartman
parent 032343ed69
commit 94de85d16b
1 changed files with 6 additions and 4 deletions
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10
drivers/gpu/drm/amd/display/dc/core/dc.c
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@@ -2226,10 +2226,12 @@ void dc_commit_updates_for_stream(struct dc *dc,
copy_stream_update_to_stream(dc, context, stream, stream_update);
if (!dc->res_pool->funcs->validate_bandwidth(dc, context, false)) {
DC_ERROR("Mode validation failed for stream update!\n");
dc_release_state(context);
return;
if (update_type > UPDATE_TYPE_FAST) {
if (!dc->res_pool->funcs->validate_bandwidth(dc, context, false)) {
DC_ERROR("Mode validation failed for stream update!\n");
dc_release_state(context);
return;
}
}
commit_planes_for_stream(