diff options
| author | Dhaval Patel <pdhaval@codeaurora.org> | 2016-03-03 13:50:52 -0800 |
|---|---|---|
| committer | David Keitel <dkeitel@codeaurora.org> | 2016-03-25 16:02:59 -0700 |
| commit | 43181da2a11a3ea335234573f15fddb3e276eb0d (patch) | |
| tree | d3ac50ee30dd08292c54e35c12a21513e01d04e8 /drivers/gpio/gpio-rcar.c | |
| parent | 06318cbfa1eeb9c0d4a6d5e256733e046710b2db (diff) | |
msm: mdss: fix mdp busy wait race condition
DSI software does not wait for MDP_DONE ISR
before sending new frame if burst mode feature is
enabled. It leads to race condition in below case
* MDP kicks off frame-N and mdp_busy sets to true
* MDP receives new frame-N+1 and waits for
PP_DONE interrupt before sending N+1 frame.
* MDP receives PP_DONE interrupt and kicks off
frame-N+1 (DSI_MDP_DONE interrupt is not received yet).
* Frame-N+1 kickoff sets the mdp_busy wait to true.
* DSI receives DSI_MDP_DONE interrupt for frame-N and
reset the mdp_busy to false.
* Any clock off call can turn off the clock at this moment.
DSI software must always execute busy_wait when kickoff
happens from mdp. That avoids the busy wait race condition.
Change-Id: I462cd5ad21d6ccc08dfb862e98fd6fafeef686d4
Signed-off-by: Dhaval Patel <pdhaval@codeaurora.org>
Diffstat (limited to 'drivers/gpio/gpio-rcar.c')
0 files changed, 0 insertions, 0 deletions