diff options
Diffstat (limited to 'drivers/gpu/drm/drm_probe_helper.c')
| -rw-r--r-- | drivers/gpu/drm/drm_probe_helper.c | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c index bcd9611dabfd..1ea053cef557 100644 --- a/drivers/gpu/drm/drm_probe_helper.c +++ b/drivers/gpu/drm/drm_probe_helper.c @@ -1146,3 +1146,85 @@ int drm_connector_helper_get_modes(struct drm_connector *connector) return count; } EXPORT_SYMBOL(drm_connector_helper_get_modes); + +/** + * drm_connector_helper_tv_get_modes - Fills the modes availables to a TV connector + * @connector: The connector + * + * Fills the available modes for a TV connector based on the supported + * TV modes, and the default mode expressed by the kernel command line. + * + * This can be used as the default TV connector helper .get_modes() hook + * if the driver does not need any special processing. + * + * Returns: + * The number of modes added to the connector. + */ +int drm_connector_helper_tv_get_modes(struct drm_connector *connector) +{ + struct drm_device *dev = connector->dev; + struct drm_property *tv_mode_property = + dev->mode_config.tv_mode_property; + struct drm_cmdline_mode *cmdline = &connector->cmdline_mode; + unsigned int ntsc_modes = BIT(DRM_MODE_TV_MODE_NTSC) | + BIT(DRM_MODE_TV_MODE_NTSC_443) | + BIT(DRM_MODE_TV_MODE_NTSC_J) | + BIT(DRM_MODE_TV_MODE_PAL_M); + unsigned int pal_modes = BIT(DRM_MODE_TV_MODE_PAL) | + BIT(DRM_MODE_TV_MODE_PAL_N) | + BIT(DRM_MODE_TV_MODE_SECAM); + unsigned int tv_modes[2] = { UINT_MAX, UINT_MAX }; + unsigned int i, supported_tv_modes = 0; + + if (!tv_mode_property) + return 0; + + for (i = 0; i < tv_mode_property->num_values; i++) + supported_tv_modes |= BIT(tv_mode_property->values[i]); + + if ((supported_tv_modes & ntsc_modes) && + (supported_tv_modes & pal_modes)) { + uint64_t default_mode; + + if (drm_object_property_get_default_value(&connector->base, + tv_mode_property, + &default_mode)) + return 0; + + if (cmdline->tv_mode_specified) + default_mode = cmdline->tv_mode; + + if (BIT(default_mode) & ntsc_modes) { + tv_modes[0] = DRM_MODE_TV_MODE_NTSC; + tv_modes[1] = DRM_MODE_TV_MODE_PAL; + } else { + tv_modes[0] = DRM_MODE_TV_MODE_PAL; + tv_modes[1] = DRM_MODE_TV_MODE_NTSC; + } + } else if (supported_tv_modes & ntsc_modes) { + tv_modes[0] = DRM_MODE_TV_MODE_NTSC; + } else if (supported_tv_modes & pal_modes) { + tv_modes[0] = DRM_MODE_TV_MODE_PAL; + } else { + return 0; + } + + for (i = 0; i < ARRAY_SIZE(tv_modes); i++) { + struct drm_display_mode *mode; + + if (tv_modes[i] == DRM_MODE_TV_MODE_NTSC) + mode = drm_mode_analog_ntsc_480i(dev); + else if (tv_modes[i] == DRM_MODE_TV_MODE_PAL) + mode = drm_mode_analog_pal_576i(dev); + else + break; + if (!mode) + return i; + if (!i) + mode->type |= DRM_MODE_TYPE_PREFERRED; + drm_mode_probed_add(connector, mode); + } + + return i; +} +EXPORT_SYMBOL(drm_connector_helper_tv_get_modes); |