diff options
Diffstat (limited to 'drivers/gpu/drm/drm_modes.c')
| -rw-r--r-- | drivers/gpu/drm/drm_modes.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c index 19188667f928..11cc4deca55b 100644 --- a/drivers/gpu/drm/drm_modes.c +++ b/drivers/gpu/drm/drm_modes.c @@ -906,6 +906,38 @@ bool drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode *mode1, EXPORT_SYMBOL(drm_mode_equal_no_clocks_no_stereo); /** + * drm_mode_validate_basic - make sure the mode is somewhat sane + * @mode: mode to check + * + * Check that the mode timings are at least somewhat reasonable. + * Any hardware specific limits are left up for each driver to check. + * + * Returns: + * The mode status + */ +enum drm_mode_status +drm_mode_validate_basic(const struct drm_display_mode *mode) +{ + if (mode->clock == 0) + return MODE_CLOCK_LOW; + + if (mode->hdisplay == 0 || + mode->hsync_start < mode->hdisplay || + mode->hsync_end < mode->hsync_start || + mode->htotal < mode->hsync_end) + return MODE_H_ILLEGAL; + + if (mode->vdisplay == 0 || + mode->vsync_start < mode->vdisplay || + mode->vsync_end < mode->vsync_start || + mode->vtotal < mode->vsync_end) + return MODE_V_ILLEGAL; + + return MODE_OK; +} +EXPORT_SYMBOL(drm_mode_validate_basic); + +/** * drm_mode_validate_size - make sure modes adhere to size constraints * @mode: mode to check * @maxX: maximum width |