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

Aradhya Bhatia
2022-09-28T17:52:57Z

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 The AM625-DSS is a newer version of the DSS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(-)

--
2.37.0