On Fri, 11 Oct 2024, Thomas Zimmermann <tzimmermann@xxxxxxx> wrote: > Track a connector's physical status separately from the logical status > and implement BMC support for DRM drivers. Connectors with virtual BMC > stay connected even if no display is physically connected. DRM clients > then continue displaying output to the BMC. > > Ast and mgag200 have been doing this for a while. Moving this into > struct drm_connector and probe helpers simplifies htese divers and > makes the functionality available to others. Hibmc is a candidate here. > > Patch just simplifies code in probe helpers and has been acked as part > of the series at [1]. > > Pathces 2 and 3 add the physical status and a BMC flag to struct > drm_connector. Usually physical connector status and regular, logical > status are in sync, so nothing changes for most drivers. If the the > BMC flag has been set, the logical status is always connected. The > probe helpers also take care of sending hotplug events if the physical > status changes. > > Patches 4 to 7 update ast and mgag200. Both drivers already implement > their own tracking of physical status, which is now handled by DRM > helpers. Ast also receives two simple bug fixes for cleaning up EDID > properties in the BMC case. > > Tested on ast and mgag200 hardware. Another driver that could make use > of this functionality is hibmc. Overall, Acked-by: Jani Nikula <jani.nikula@xxxxxxxxx> but please do improve the documentation, and consider alternatives to the bmc_attached naming. > > [1] https://patchwork.freedesktop.org/series/136084/ > > Thomas Zimmermann (7): > drm/probe-helper: Call connector detect functions in single helper > drm: Add physical status to connector > drm: Add bmc_attached flag to connector > drm/ast: sil164: Clear EDID if no display is connected > drm/ast: vga: Clear EDID if no display is connected > drm/ast: Track physical connector status in struct drm_connector > drm/mgag200: Track physical connector status in struct drm_connector > > drivers/gpu/drm/ast/ast_dp.c | 21 +++------- > drivers/gpu/drm/ast/ast_dp501.c | 17 ++------ > drivers/gpu/drm/ast/ast_drv.h | 24 ++--------- > drivers/gpu/drm/ast/ast_sil164.c | 19 +++------ > drivers/gpu/drm/ast/ast_vga.c | 30 +++----------- > drivers/gpu/drm/drm_connector.c | 1 + > drivers/gpu/drm/drm_probe_helper.c | 50 +++++++++++++---------- > drivers/gpu/drm/mgag200/mgag200_vga_bmc.c | 32 +++------------ > include/drm/drm_connector.h | 15 +++++++ > 9 files changed, 77 insertions(+), 132 deletions(-) -- Jani Nikula, Intel
