msm: mdss: fix stage mismatch error during mixer setup

mdss_mdp_mixer_pipe_update function performs two tasks, one it stages
pipe onto mixer's stage_pipe container for next frame and it also
un-stages same pipe from previous stage if different. When source split
is enabled, pipe can be on left blend or right blend of a given stage.
Now between consecutive frame, pipe can change the z_order and it can
change its blend as well. However current implementation of pipe update
function has an issue where it doesn't un-stage the pipe if its blend
changes between consecutive frames. Check the example below.

* Frame N, pipe X is on right blend, odd index, at z_order 1
* Frame N+1, pipe X is on left blend, even index, at z_order 2

Now when mdss_mdp_mixer_pipe_update is called for Frame (N+1), it should
stage pipe X at z_order 2 and on left blend. It also need to remove the
pipe from right blend of the z_order 1. Due to the bug 2nd task is not
performed and it leads to above error message. There were no side effects
of this bug except for the transient error log.

Change-Id: I0d6b4d9574b8ea9229754199250e2ce795ca2e12
Signed-off-by: Ujwal Patel <ujwalp@codeaurora.org>

0 files changed, 0 insertions, 0 deletions