diff options
| -rw-r--r-- | drivers/gpu/drm/drm_modes.c | 32 | ||||
| -rw-r--r-- | drivers/gpu/drm/drm_probe_helper.c | 5 | ||||
| -rw-r--r-- | include/drm/drm_modes.h | 1 |
3 files changed, 37 insertions, 1 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 diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c index 2161d8ed7c65..2fbdcca7ca9a 100644 --- a/drivers/gpu/drm/drm_probe_helper.c +++ b/drivers/gpu/drm/drm_probe_helper.c @@ -167,7 +167,10 @@ static int drm_helper_probe_single_connector_modes_merge_bits(struct drm_connect mode_flags |= DRM_MODE_FLAG_3D_MASK; list_for_each_entry(mode, &connector->modes, head) { - mode->status = drm_mode_validate_size(mode, maxX, maxY); + mode->status = drm_mode_validate_basic(mode); + + if (mode->status == MODE_OK) + mode->status = drm_mode_validate_size(mode, maxX, maxY); if (mode->status == MODE_OK) mode->status = drm_mode_validate_flag(mode, mode_flags); diff --git a/include/drm/drm_modes.h b/include/drm/drm_modes.h index 6c531140d458..a36a5bfce2f5 100644 --- a/include/drm/drm_modes.h +++ b/include/drm/drm_modes.h @@ -217,6 +217,7 @@ bool drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode *mode1, const struct drm_display_mode *mode2); /* for use by the crtc helper probe functions */ +enum drm_mode_status drm_mode_validate_basic(const struct drm_display_mode *mode); enum drm_mode_status drm_mode_validate_size(const struct drm_display_mode *mode, int maxX, int maxY); void drm_mode_prune_invalid(struct drm_device *dev, |