Am Dienstag, 28. August 2018, 12:24:43 CEST schrieb Damian Kos:
Hello!
This is the series of patches that will add support for the Cadence's DPI/DP bridge. Please note that this is a preliminary version of the driver and there will be more patches in the future with updates, fixes and improvements. Please keep that in mind when looking at FIXME/TODO/XXX comments.
Initially, MHDP driver was developed as a DRM bridge driver and was planed to be placed in drivers/gpu/drm/bridge/mhdp.c. However, there was already a driver for Cadence's DP controller developed by RockChip, but that driver uses the different DRM framework and looks like a part of a bigger system. Both controllers (including firmware) are quite different internally (MST/FEC/DSC support, link training done by driver, additional commands, IRQ's etc.) but they have similar register map, except for Framer/Streamer (which is noticeably different), so they appear similar.
The following patches contain:
- Moving common code to drivers/gpu/drm/bridge/cdns-mhdp-common.* and modifying it a bit (mostly new prefixes for functions and data types) so it can be used by two, higher level, drivers.
- Modifying existing RockChip's DP driver to use the common code after changes made to it (use the new cdns_mhdp_device structure and new function names).
- Modifying DRM helpers a bit. Some are required for new driver, some are updates from DP 1.2 to 1.3 or 1.4.
- Adding documentation for device tree bindings.
- Adding preliminary Cadence DPI/DP bridge driver.
Some of the things that will be added later on include (but are not limited to):
- Support for Cadence SD0801 PHY (PHY's driver should be on the way by now)
- MST support
- DSC support
- FEC support
- HDCP support
with te Kconfig issue in patch5 fixed, this series tested on rk3288 (analogix-dp) and rk3399 (analogix-dp + cadence-dp) Everything seems to work that worked before.
Tested-by: Heiko Stuebner heiko@sntech.de