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drm/amd/display: re-enable wait in pipelock, but add timeout

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commit 627f75d18910b287472593a4a2c41de9a386f5a2 upstream.

Removing this causes hangs in some games, so re-add it, but add
a timeout so we don't hang while switching flip types.

Bug: https://bugzilla.kernel.org/show_bug.cgi?id=205169
Bug: https://bugs.freedesktop.org/show_bug.cgi?id=112266
Reviewed-by: Harry Wentland <harry.wentland@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:
Alex Deucher 2019-11-15 10:02:44 -05:00 committed by Greg Kroah-Hartman
parent 803eb24439
commit 0d3e9622ad
1 changed files with 19 additions and 0 deletions
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19
drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
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@ -1103,6 +1103,25 @@ void dcn20_pipe_control_lock(
if (pipe->plane_state != NULL)
flip_immediate = pipe->plane_state->flip_immediate;
if (flip_immediate && lock) {
const int TIMEOUT_FOR_FLIP_PENDING = 100000;
int i;
for (i = 0; i < TIMEOUT_FOR_FLIP_PENDING; ++i) {
if (!pipe->plane_res.hubp->funcs->hubp_is_flip_pending(pipe->plane_res.hubp))
break;
udelay(1);
}
if (pipe->bottom_pipe != NULL) {
for (i = 0; i < TIMEOUT_FOR_FLIP_PENDING; ++i) {
if (!pipe->bottom_pipe->plane_res.hubp->funcs->hubp_is_flip_pending(pipe->bottom_pipe->plane_res.hubp))
break;
udelay(1);
}
}
}
/* In flip immediate and pipe splitting case, we need to use GSL
* for synchronization. Only do setup on locking and on flip type change.
*/