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): - DSC support - FEC support - HDCP support Changes in v7: - Overal code cleanup - Patched memory leak after EDID read - Fixed SPDX-License-Identifier tags - Sorted includes - In patch 4/6: Cleanup and fix in mhdp_transfer Replaced byteshifts with {put|get}_unaligned_be{32|24|16} (added 24bit one) - In patch 5/6: Removed cdns_mhdp_mst_set_threshold (not needed anymore as HW does that) Updated cdns_mhdp_mst_set_rate_governing Replaced request_irq with devm_request_irq And then merged with 4/6 (as many changes in this patch altered the SST part) - In patch 6/6: Fix in checking devm_phy_get result Updated bindings doc And then merged with 4/6 (as this should be in the driver in the first place) Changes in v6: - Added Reviewed-bys for already reviewed patches - Dropped patch v5-0003 (that made dp_get_lane_status helper public) - Added patch with MST support - Added patch with Cadence SD0801 PHY init Changes in v5: - Fixed Kconfig in drm/rockchip again - Moved cdn-dp-reg.h (cdns-mhdp-common.h) to include/drm/bridge instead of drivers/gpu/drm/bridge/ - Updated the mhdp_validate_cr function Changes in v4: - Fixed Kconfig in drm/rockchip - Fixed Signed-offs - dp_link_status() is no longer public since it's used only in drm_dp_helper.c - Replaced EXTRA_CFLAGS with ccflags-y in drm/rockchip Makefile Changes in v3: - Corrected dt-bindings document - Enabled some clocks at startup (since FW doesn't do that anymore). - Changed Firmware file name to match the file on Linux Firmware repo. - Added SST audio support - Made common functions (in cdns-mhdp-common.*) public. Changes in v2: - Added actual description of what the patch contains, what is it for and what's going on here in general. - New structure. Now we have one common low level driver + two high level drivers - one for RockChip with minimum changes and one, more general, for Cadence. - Dropped some changes made to DRM helpers. - Updated the device tree bindings document. Damian Kos (1): drm/rockchip: prepare common code for cdns and rk dpi/dp driver Quentin Schulz (3): drm/dp: fix link probing for devices supporting DP 1.4+ dt-bindings: drm/bridge: Document Cadence MHDP bridge bindings drm: bridge: add support for Cadence MHDP DPI/DP bridge .../bindings/display/bridge/cdns,mhdp.txt | 47 + drivers/gpu/drm/bridge/Kconfig | 9 + drivers/gpu/drm/bridge/Makefile | 3 + drivers/gpu/drm/bridge/cdns-mhdp-common.c | 1103 ++++++++++++++ drivers/gpu/drm/bridge/cdns-mhdp-mst.c | 549 +++++++ drivers/gpu/drm/bridge/cdns-mhdp.c | 1349 +++++++++++++++++ drivers/gpu/drm/bridge/cdns-mhdp.h | 209 +++ drivers/gpu/drm/drm_dp_helper.c | 30 +- drivers/gpu/drm/rockchip/Kconfig | 4 +- drivers/gpu/drm/rockchip/Makefile | 2 +- drivers/gpu/drm/rockchip/cdn-dp-core.c | 234 +-- drivers/gpu/drm/rockchip/cdn-dp-core.h | 43 +- drivers/gpu/drm/rockchip/cdn-dp-reg.c | 969 ------------ include/drm/bridge/cdns-mhdp-cbs.h | 29 + .../drm/bridge/cdns-mhdp-common.h | 176 ++- 15 files changed, 3606 insertions(+), 1150 deletions(-) create mode 100644 Documentation/devicetree/bindings/display/bridge/cdns,mhdp.txt create mode 100644 drivers/gpu/drm/bridge/cdns-mhdp-common.c create mode 100644 drivers/gpu/drm/bridge/cdns-mhdp-mst.c create mode 100644 drivers/gpu/drm/bridge/cdns-mhdp.c create mode 100644 drivers/gpu/drm/bridge/cdns-mhdp.h delete mode 100644 drivers/gpu/drm/rockchip/cdn-dp-reg.c create mode 100644 include/drm/bridge/cdns-mhdp-cbs.h rename drivers/gpu/drm/rockchip/cdn-dp-reg.h => include/drm/bridge/cdns-mhdp-common.h (77%) -- 2.17.1