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[v4,0/4] Allow drm_writeback_connector to accept pointer to drm_encoder

Message ID 1647567936-11971-1-git-send-email-quic_abhinavk@quicinc.com (mailing list archive)
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Series Allow drm_writeback_connector to accept pointer to drm_encoder | expand

Message

Abhinav Kumar March 18, 2022, 1:45 a.m. UTC 
There are some vendor drivers for which the writeback encoder shares
hardware resources such as clocks and interrupts with the rest of the
display pipeline. In addition, there can be use-cases where the
writeback encoder could be a shared encoder between the physical display
path and the writeback path.

To accommodate for such cases, change the drm_writeback_connector to
accept a pointer to drm_encoder.

For existing users of drm_writeback_connector there will not be any
change in functionality due to this change.

This approach was first posted by Suraj Kandpal here [1] for both
encoder and connector. But after discussions [2], the consensus was
reached to split this change for the drm_encoder first and the
drm_connector part can be reworked in a subsequent change later.

Validation of this change was done using igt_writeback tests on
MSM based RB5 board using the changes posted here [3].

For all other chipsets, these changes were compile-tested.

[1] https://patchwork.kernel.org/project/dri-devel/patch/20220202081702.22119-1-suraj.kandpal@intel.com/
[2] https://patchwork.kernel.org/project/dri-devel/patch/20220202085429.22261-6-suraj.kandpal@intel.com/
[3] https://patchwork.freedesktop.org/series/99724/

changes in v4:
		-  split the changes more according to functionality

Abhinav Kumar (4):
  drm: allow passing possible_crtcs to drm_writeback_connector_init()
  drm: allow real encoder to be passed for drm_writeback_connector
  drm: introduce drm_writeback_connector_init_with_encoder() API
  drm/vc4: change vc4 driver to use
    drm_writeback_connector_init_with_encoder()

 .../drm/arm/display/komeda/komeda_wb_connector.c   |   3 +-
 drivers/gpu/drm/arm/malidp_mw.c                    |   4 +-
 drivers/gpu/drm/drm_writeback.c                    | 143 +++++++++++++++------
 drivers/gpu/drm/rcar-du/rcar_du_writeback.c        |   4 +-
 drivers/gpu/drm/vc4/vc4_txp.c                      |  36 ++++--
 drivers/gpu/drm/vkms/vkms_writeback.c              |   4 +-
 include/drm/drm_writeback.h                        |  25 +++-
 7 files changed, 161 insertions(+), 58 deletions(-)