[PATCH v5 00/22] drm: Analog TV Improvements

Maxime Ripard
2022-10-13T13:22:20Z

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

To: David Airlie <airlied@linux.ie>
To: Daniel Vetter <daniel@ffwll.ch>
To: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
To: Maxime Ripard <mripard@kernel.org>
To: Thomas Zimmermann <tzimmermann@suse.de>
To: Emma Anholt <emma@anholt.net>
To: Jani Nikula <jani.nikula@linux.intel.com>
To: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
To: Rodrigo Vivi <rodrigo.vivi@intel.com>
To: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
To: Ben Skeggs <bskeggs@redhat.com>
To: Karol Herbst <kherbst@redhat.com>
To: Lyude Paul <lyude@redhat.com>
To: Chen-Yu Tsai <wens@csie.org>
To: Jernej Skrabec <jernej.skrabec@gmail.com>
To: Samuel Holland <samuel@sholland.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Mateusz Kwiatkowski <kfyatek+publicgit@gmail.com>
Cc: "Noralf Trønnes" <noralf@tronnes.org>
Cc: Dave Stevenson <dave.stevenson@raspberrypi.com>
Cc: Dom Cobley <dom@raspberrypi.com>
Cc: Phil Elwell <phil@raspberrypi.com>
Cc: <dri-devel@lists.freedesktop.org>
Cc: linux-kernel@vger.kernel.org
Cc: intel-gfx@lists.freedesktop.org
Cc: nouveau@lists.freedesktop.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-sunxi@lists.linux.dev
Cc: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>

---
Changes in v5:
- Dropped TV Standard documentation removal
- Switched the TV Mode documentation from CSV to actual documentation
- Switched to kunit assertions where possible
- Switched to KUNIT_ASSERT_NOT_NULL instead of KUNIT_ASSERT_PTR_NE(..., NULL)
- Shuffled a bit the introduction of drm_client_modeset_connector_get_modes between patches
- Renamed tv_mode_names to legacy_tv_mode_names
- Removed the count variable in sun4i_tv_comp_get_modes
- Rebased on top of current drm-misc-next
- Link to v4: https://lore.kernel.org/r/20220728-rpi-analog-tv-properties-v4-0-60d38873f782@cerno.tech

Changes in v4:
- Removed the unused TV Standard property documentation
- Added the TV Mode property documentation to kms-properties.csv
- Fixed the documentation of drm_mode_create_tv_properties()
- Removed DRM_MODE_TV_MODE_NONE
- Reworded the line length check comment in drm_mode_analog_tv tests
- Switched to HZ_PER_KHZ in drm_mode_analog_tv tests
- Reworked drm_mode_analog_tv to fill our mode using the previously computed
timings
- Added the command-line option documentation to modedb.rst
- Improved the Kunit helpers cleanup
- Moved the subconnector documentation renaming to the proper patch
- Added the various review tags
- Removed the count variable in vc4_vec_connector_get_modes
- Rebased on drm-misc-next-2022-09-23 and fixed a merge conflict
- Folded all the named mode parsing improvements in a single patch
- Link to v3: https://lore.kernel.org/r/20220728-rpi-analog-tv-properties-v2-0-f733a0ed9f90@cerno.tech

Changes in v3:
- Applied some of the fixes to vc4 and sun4i
- Renamed the old TV mode property to legacy_mode
- Fixed a bunch of bisection errors
- Removed most of the redundant TV modes
- Added a new None TV mode to not fall back on NTSC by mistake
- Fixed the mode generation function to match better what is expected
- Added some logging to the mode generation function
- Split the improvements to the named mode parsing logic into separate patches
- Added more checks to the TV atomic_check helper
- Link to v2: https://lore.kernel.org/dri-devel/20220728-rpi-analog-tv-properties-v2-0-459522d653a7@cerno.tech/

Changes in v2:
- Kept the older TV mode property as legacy so we can keep the old drivers functional
- Renamed the tv_norm property to tv_mode
- Added a function to create PAL and NTSC compatible display modes
- Added some helpers to instantiate a mock DRM device in Kunit
- More Kunit tests
- Removed the HD analog TV modes
- Renamed some of the tests
- Renamed some of the named modes
- Fixed typos in commit logs
- Added the various tags
- Link to v1: https://lore.kernel.org/dri-devel/20220728-rpi-analog-tv-properties-v1-0-3d53ae722097@cerno.tech/

---
Mateusz Kwiatkowski (2):
drm/vc4: vec: Check for VEC output constraints
drm/vc4: vec: Add support for more analog TV standards

Maxime Ripard (20):
drm/tests: Add Kunit Helpers
drm/connector: Rename legacy TV property
drm/connector: Only register TV mode property if present
drm/connector: Rename drm_mode_create_tv_properties
drm/connector: Add TV standard property
drm/modes: Add a function to generate analog display modes
drm/client: Add some tests for drm_connector_pick_cmdline_mode()
drm/modes: Move named modes parsing to a separate function
drm/modes: Switch to named mode descriptors
drm/modes: Fill drm_cmdline mode from named modes
drm/connector: Add pixel clock to cmdline mode
drm/connector: Add a function to lookup a TV mode by its name
drm/modes: Introduce the tv_mode property as a command-line option
drm/modes: Properly generate a drm_display_mode from a named mode
drm/modes: Introduce more named modes
drm/atomic-helper: Add a TV properties reset helper
drm/atomic-helper: Add an analog TV atomic_check implementation
drm/vc4: vec: Use TV Reset implementation
drm/vc4: vec: Convert to the new TV mode property
drm/sun4i: tv: Convert to the new TV mode property

Documentation/fb/modedb.rst | 2 +
Documentation/gpu/drm-kms.rst | 6 +
drivers/gpu/drm/drm_atomic_state_helper.c | 124 +++++
drivers/gpu/drm/drm_atomic_uapi.c | 4 +
drivers/gpu/drm/drm_client_modeset.c | 4 +
drivers/gpu/drm/drm_connector.c | 173 ++++++-
drivers/gpu/drm/drm_modes.c | 640 +++++++++++++++++++++++-
drivers/gpu/drm/gud/gud_connector.c | 10 +-
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 | 145 ++----
drivers/gpu/drm/tests/Makefile | 2 +
drivers/gpu/drm/tests/drm_client_modeset_test.c | 229 +++++++++
drivers/gpu/drm/tests/drm_cmdline_parser_test.c | 67 +++
drivers/gpu/drm/tests/drm_kunit_helpers.c | 61 +++
drivers/gpu/drm/tests/drm_kunit_helpers.h | 9 +
drivers/gpu/drm/tests/drm_modes_test.c | 144 ++++++
drivers/gpu/drm/vc4/vc4_vec.c | 322 ++++++++++--
include/drm/drm_atomic_state_helper.h | 4 +
include/drm/drm_connector.h | 82 ++-
include/drm/drm_mode_config.h | 12 +-
include/drm/drm_modes.h | 17 +
23 files changed, 1889 insertions(+), 185 deletions(-)
---
base-commit: 735e41d339cd617ce056dfd630c6de03c56eb6cd
change-id: 20220728-rpi-analog-tv-properties-0914dfcee460

Best regards,
--
Maxime Ripard <maxime@cerno.tech>