This small patchset helps rework the VSP1 driver to repair an issue on
suspend/resume operations whereby the pipeline does not get reconfigured after
it has been re-initialised following a resume operation.
Along side this, there was an intrinsic race in the vsp1_video_start_streaming()
function whereby multiple streams operating through a BRU, could find themselves
commencing an operation before the pipeline has been configured, or worse -
commencing, just as the pipeline is being configured resulting in a null pointer
dereference on pipe->dl.
This series superceeds a previous effort to fix the BRU race.
Patch [1/4] is a code move only, with no functional change.
Patch [2/4] refactors the vsp1_video_start_streaming() function and fixes both
suspend/resume, and the BRU race in a single change
Patch [3/4] removes the context scoped 'pipe->dl' which has been susceptible to
races and isn't required to be in the context.
Patch [4/4] is an RFC patch really, that fixes a segfault on error paths and I
certainly expect feedback and brief discussion. Please drop Patch 4
in the event of any further discussion, and don't consider it as
blocking for the first three patches of this series.
v3:
- Move configured=false from vsp1_device_init to vsp1_reset_wpf()
- Clean up flag dereferencing with a local struct *
v2:
- Refactor video pipeline configuration implementation to solve both suspend
resume and the VSP BRU race in a single change
v1:
- Original pipeline configuration rework
Kieran Bingham (4):
v4l: vsp1: Move vsp1_video_setup_pipeline()
v4l: vsp1: Refactor video pipeline configuration
v4l: vsp1: Use local display lists and remove global pipe->dl
media: Catch null pipes on pipeline stop
drivers/media/media-entity.c | 2 +
drivers/media/platform/vsp1/vsp1_drm.c | 20 ++---
drivers/media/platform/vsp1/vsp1_drv.c | 4 +
drivers/media/platform/vsp1/vsp1_pipe.c | 1 +
drivers/media/platform/vsp1/vsp1_pipe.h | 4 +-
drivers/media/platform/vsp1/vsp1_video.c | 127 +++++++++++++++----------------
6 files changed, 79 insertions(+), 79 deletions(-)
--
2.7.4
