Den 22.09.2022 16.25, skrev Maxime Ripard: > Hi, > > Here's a series aiming at improving the command line named modes support, > and more importantly how we deal with all the analog TV variants. > > The named modes support were initially introduced to allow to specify the > analog TV mode to be used. > > However, this was causing multiple issues: > > * The mode name parsed on the command line was passed directly to the > driver, which had to figure out which mode it was suppose to match; > > * Figuring that out wasn't really easy, since the video= argument or what > the userspace might not even have a name in the first place, but > instead could have passed a mode with the same timings; > > * The fallback to matching on the timings was mostly working as long as > we were supporting one 525 lines (most likely NSTC) and one 625 lines > (PAL), but couldn't differentiate between two modes with the same > timings (NTSC vs PAL-M vs NSTC-J for example); > > * There was also some overlap with the tv mode property registered by > drm_mode_create_tv_properties(), but named modes weren't interacting > with that property at all. > > * Even though that property was generic, its possible values were > specific to each drivers, which made some generic support difficult. > > Thus, I chose to tackle in multiple steps: > > * A new TV mode property was introduced, with generic values, each driver > reporting through a bitmask what standard it supports to the userspace; > > * This option was added to the command line parsing code to be able to > specify it on the kernel command line, and new atomic_check and reset > helpers were created to integrate properly into atomic KMS; > > * The named mode parsing code is now creating a proper display mode for > the given named mode, and the TV standard will thus be part of the > connector state; > > * Two drivers were converted and tested for now (vc4 and sun4i), with > some backward compatibility code to translate the old TV mode to the > new TV mode; > > Unit tests were created along the way. > > One can switch from NTSC to PAL now using (on vc4) > > modetest -M vc4 -s 53:720x480i -w 53:'TV mode':1 # NTSC > modetest -M vc4 -s 53:720x576i -w 53:'TV mode':4 # PAL > > Let me know what you think, > Maxime <snip> > drivers/gpu/drm/drm_atomic_state_helper.c | 128 ++++- > drivers/gpu/drm/drm_atomic_uapi.c | 8 + > drivers/gpu/drm/drm_client_modeset.c | 4 + > drivers/gpu/drm/drm_connector.c | 111 +++- > drivers/gpu/drm/drm_modes.c | 658 +++++++++++++++++++++++- > drivers/gpu/drm/gud/gud_connector.c | 12 +- > drivers/gpu/drm/i2c/ch7006_drv.c | 6 +- > drivers/gpu/drm/i915/display/intel_tv.c | 5 +- > drivers/gpu/drm/nouveau/dispnv04/tvnv17.c | 6 +- > drivers/gpu/drm/sun4i/sun4i_tv.c | 148 ++---- > drivers/gpu/drm/tests/Makefile | 16 +- > drivers/gpu/drm/tests/drm_client_modeset_test.c | 239 +++++++++ > drivers/gpu/drm/tests/drm_cmdline_parser_test.c | 67 +++ > drivers/gpu/drm/tests/drm_kunit_helpers.c | 54 ++ > drivers/gpu/drm/tests/drm_kunit_helpers.h | 9 + > drivers/gpu/drm/tests/drm_modes_test.c | 136 +++++ > drivers/gpu/drm/vc4/vc4_hdmi.c | 2 +- > drivers/gpu/drm/vc4/vc4_vec.c | 339 ++++++++++-- > include/drm/drm_atomic_state_helper.h | 4 + > include/drm/drm_connector.h | 92 +++- > include/drm/drm_mode_config.h | 12 +- > include/drm/drm_modes.h | 17 + These also needs updating: Documentation/gpu/kms-properties.csv Documentation/fb/modedb.rst Noralf.
