[RFC,v5,0/6] Add DSS support for AM625 SoC

Message

Aradhya Bhatia Sept. 28, 2022, 5:52 p.m. UTC

This patch series adds a new compatible for the Display SubSyetem
controller on TI's AM625 SoC. It further adds the required support for
the same in the tidss driver. The AM625-DSS is a newer version of the DSS
from the AM65X version with the major change being the addition of
another OLDI TX. With the help of 2 OLDI TXes, the AM625 DSS supports
OLDI displays with a resolution of upto 2K.

This patch set further adds support for the OLDI on AM625, and is, in
essence, the second version of the following patch series:
https://patchwork.kernel.org/project/dri-devel/list/?series=660970&state=%2A&archive=both

The changes in the above-mentioned series forced some re-works in this
series, and are better reviewed as a single set.

TODO:
  - Support for OLDI Bridges that work on clone / dual-link modes is yet
    to be added.

  - The pixel clock for the OLDI VP passes through a clock divider, which
    was being explicitly set in previous series, but that was not the
    right way. That patch has been dropped and a newer implementation is
    in works.

Note:
  - Due to lack of hardware, only dual-link mode has been tested.

Changelog:
V5:
  - Rebase for current merge window
  - Add max DT ports in DSS features
  - Combine the OLDI support series

(Changes from OLDI support series v1)
  - Address Tomi Valkeinen's comments
    1. Update the OLDI link detection approach
    2. Add port #3 for 2nd OLDI TX
    3. Configure 2 panel-bridges for cloned panels
    4. Drop the OLDI clock set patch
    5. Drop rgb565-to-888 patch

V4:
  - Rebase for current merge window
  - Add acked and reviewed by tags

V3:
  - Change yaml enum in alphabetical order
  - Correct a typo

V2:
  - Remove redundant regsiter array

Aradhya Bhatia (6):
  dt-bindings: display: ti,am65x-dss: Add am625 dss compatible
  dt-bindings: display: ti: am65x-dss: Add new port for am625-dss
  drm/tidss: Add support for AM625 DSS
  drm/tidss: Add support to configure OLDI mode for am625-dss.
  drm/tidss: Add IO CTRL and Power support for OLDI TX in am625
  drm/tidss: Enable Dual and Duplicate Modes for OLDI

 .../bindings/display/ti/ti,am65x-dss.yaml     |  22 ++-
 drivers/gpu/drm/tidss/tidss_dispc.c           | 155 ++++++++++++++++--
 drivers/gpu/drm/tidss/tidss_dispc.h           |  11 ++
 drivers/gpu/drm/tidss/tidss_dispc_regs.h      |   6 +
 drivers/gpu/drm/tidss/tidss_drv.c             |   1 +
 drivers/gpu/drm/tidss/tidss_drv.h             |   3 +
 drivers/gpu/drm/tidss/tidss_kms.c             | 146 ++++++++++++++---
 7 files changed, 304 insertions(+), 40 deletions(-)