Old or simple hardware only supports a single CRTC with multiple conenctoed outputs. This breaks most userspace compositors, which only support a single output per CRTC. This currently happens with ast and mgag200 drivers. The drivers contain a work around that dynamically disables all but one connected output. Patches 1 and 2 push the workaround into probe helpers and make it configurable in the kernel config. For each connector, the driver needs to specify a bitmask of connectors with higher priority. If one of them is connected, the connector at hand is always reported as disconnected. Connectors without priority bitmask as not affected. Patches 3 to 5 update and simplify the ast drivers. The new workaround now allows to have multiple physical conenctors in ast. So patch 5 finally allows VGA and DisplayPort on the same device. Patches 6 and 7 update mgag200. Any future driver that exposes the same problem as ast and mgag200 can simply hook into the workaround. Hopefully userspace can be fixed at some point. Thomas Zimmermann (7): drm/probe-helper: Call connector detect functions in single helper drm/probe-helper: Optionally report single connected output per CRTC drm/ast: Set connector priorities drm/ast: Remove struct ast_bmc_connector drm/ast: Support ASTDP and VGA at the same time drm/mgag200: Set connector priorities drm/mgag200: Remove struct mgag200_bmc_connector drivers/gpu/drm/Kconfig | 15 +++ drivers/gpu/drm/ast/ast_drv.h | 17 +-- drivers/gpu/drm/ast/ast_main.c | 2 +- drivers/gpu/drm/ast/ast_mode.c | 49 ++------ drivers/gpu/drm/drm_probe_helper.c | 137 +++++++++++++++++++--- drivers/gpu/drm/mgag200/mgag200_bmc.c | 44 +------ drivers/gpu/drm/mgag200/mgag200_drv.h | 9 +- drivers/gpu/drm/mgag200/mgag200_g200eh.c | 4 +- drivers/gpu/drm/mgag200/mgag200_g200eh3.c | 4 +- drivers/gpu/drm/mgag200/mgag200_g200er.c | 4 +- drivers/gpu/drm/mgag200/mgag200_g200ev.c | 4 +- drivers/gpu/drm/mgag200/mgag200_g200ew3.c | 4 +- drivers/gpu/drm/mgag200/mgag200_g200se.c | 4 +- drivers/gpu/drm/mgag200/mgag200_g200wb.c | 4 +- include/drm/drm_connector.h | 2 + include/drm/drm_probe_helper.h | 2 + 16 files changed, 177 insertions(+), 128 deletions(-) -- 2.45.2
