drm/modes: Introduce more named modes

Now that we can easily extend the named modes list, let's add a few more
analog TV modes that were used in the wild, and some unit tests to make
sure it works as intended.
Reviewed-by: Noralf Trønnes <noralf@tronnes.org>
Tested-by: Mateusz Kwiatkowski <kfyatek+publicgit@gmail.com>
Acked-in-principle-or-something-like-that-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://lore.kernel.org/r/20220728-rpi-analog-tv-properties-v10-11-256dad125326@cerno.techSigned-off-by: Maxime Ripard <maxime@cerno.tech>

Documentation/fb/modedb.rst

@@ -29,7 +29,10 @@ Things between square brackets are optional.
 Valid names are::
 
   - NSTC: 480i output, with the CCIR System-M TV mode and NTSC color encoding
+  - NTSC-J: 480i output, with the CCIR System-M TV mode, the NTSC color
+    encoding, and a black level equal to the blanking level.
   - PAL: 576i output, with the CCIR System-B TV mode and PAL color encoding
+  - PAL-M: 480i output, with the CCIR System-M TV mode and PAL color encoding
 
 If 'M' is specified in the mode_option argument (after <yres> and before
 <bpp> and <refresh>, if specified) the timings will be calculated using

drivers/gpu/drm/drm_modes.c

@@ -2274,7 +2274,9 @@ struct drm_named_mode {
 
 static const struct drm_named_mode drm_named_modes[] = {
 	NAMED_MODE("NTSC", 13500, 720, 480, DRM_MODE_FLAG_INTERLACE, DRM_MODE_TV_MODE_NTSC),
+	NAMED_MODE("NTSC-J", 13500, 720, 480, DRM_MODE_FLAG_INTERLACE, DRM_MODE_TV_MODE_NTSC_J),
 	NAMED_MODE("PAL", 13500, 720, 576, DRM_MODE_FLAG_INTERLACE, DRM_MODE_TV_MODE_PAL),
+	NAMED_MODE("PAL-M", 13500, 720, 480, DRM_MODE_FLAG_INTERLACE, DRM_MODE_TV_MODE_PAL_M),
 };
 
 static int drm_mode_parse_cmdline_named_mode(const char *name,

drivers/gpu/drm/tests/drm_client_modeset_test.c

@@ -150,7 +150,9 @@ static void drm_test_pick_cmdline_named(struct kunit *test)
 static const
 struct drm_connector_pick_cmdline_mode_test drm_connector_pick_cmdline_mode_tests[] = {
 	TEST_CMDLINE("NTSC", drm_mode_analog_ntsc_480i),
+	TEST_CMDLINE("NTSC-J", drm_mode_analog_ntsc_480i),
 	TEST_CMDLINE("PAL", drm_mode_analog_pal_576i),
+	TEST_CMDLINE("PAL-M", drm_mode_analog_ntsc_480i),
 };
 
 static void