drm: sync the mode validation for INTERLACE/DBLSCAN

Check whether the INTERLACE/DBLSCAN is supported by output device. If
not, the mode containing the flag of INTERLACE/DBLSCAN will be marked
as unsupported.

Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 28 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c
index 1c3a8c557140..4c93b7b8560f 100644
--- a/drivers/gpu/drm/drm_crtc_helper.c
+++ b/drivers/gpu/drm/drm_crtc_helper.c
@@ -42,6 +42,26 @@ static struct drm_display_mode std_modes[] = {
                    DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
 };
 
+static void drm_mode_validate_flag(struct drm_connector *connector,
+                                   int flags)
+{
+        struct drm_display_mode *mode, *t;
+
+        if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE))
+                return;
+
+        list_for_each_entry_safe(mode, t, &connector->modes, head) {
+                if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
+                                !(flags & DRM_MODE_FLAG_INTERLACE))
+                        mode->status = MODE_NO_INTERLACE;
+                if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
+                                !(flags & DRM_MODE_FLAG_DBLSCAN))
+                        mode->status = MODE_NO_DBLESCAN;
+        }
+
+        return;
+}
+
 /**
  * drm_helper_probe_connector_modes - get complete set of display modes
  * @dev: DRM device
@@ -72,6 +92,7 @@ int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
         struct drm_connector_helper_funcs *connector_funcs =
                 connector->helper_private;
         int count = 0;
+        int mode_flags = 0;
 
         DRM_DEBUG("%s\n", drm_get_connector_name(connector));
         /* set all modes to the unverified state */
@@ -96,6 +117,13 @@ int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
         if (maxX && maxY)
                 drm_mode_validate_size(dev, &connector->modes, maxX,
                                        maxY, 0);
+
+        if (connector->interlace_allowed)
+                mode_flags |= DRM_MODE_FLAG_INTERLACE;
+        if (connector->doublescan_allowed)
+                mode_flags |= DRM_MODE_FLAG_DBLSCAN;
+        drm_mode_validate_flag(connector, mode_flags);
+
         list_for_each_entry_safe(mode, t, &connector->modes, head) {
                 if (mode->status == MODE_OK)
                         mode->status = connector_funcs->mode_valid(connector,