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SubjectRe: [PATCH v2 00/33] drm: Analog TV Improvements
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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.

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