drm/kms: try to find the std mode in DMT table

When we need to add the standard timing mode, we will firstly check whether it
can be found in DMT table by comparing the hdisplay/vdisplay/vfresh_rate.
If it can't be found, then we will use the cvt/gtf to add the required mode.
If it can be found, it will be returned.

At the same time the function of drm_mode_vrefresh is also fixed. It will
return the result of actual refresh_rate plus 0.5.
For example:
When the calculated value is 84.9, then the fresh_rate is 85.
When the calculated value is 70.02, then the fresh_rate is 70.

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

1 files changed, 33 insertions, 7 deletions

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index e64eb6bbce1a..f84a98f2e373 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -480,6 +480,26 @@ static struct drm_display_mode drm_dmt_modes[] = {
                    DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) },
 };
 
+static struct drm_display_mode *drm_find_dmt(struct drm_device *dev,
+                        int hsize, int vsize, int fresh)
+{
+        int i, count;
+        struct drm_display_mode *ptr, *mode;
+
+        count = sizeof(drm_dmt_modes) / sizeof(struct drm_display_mode);
+        mode = NULL;
+        for (i = 0; i < count; i++) {
+                ptr = &drm_dmt_modes[i];
+                if (hsize == ptr->hdisplay &&
+                        vsize == ptr->vdisplay &&
+                        fresh == drm_mode_vrefresh(ptr)) {
+                        /* get the expected default mode */
+                        mode = drm_mode_duplicate(dev, ptr);
+                        break;
+                }
+        }
+        return mode;
+}
 /**
  * drm_mode_std - convert standard mode info (width, height, refresh) into mode
  * @t: standard timing params
@@ -516,16 +536,22 @@ struct drm_display_mode *drm_mode_std(struct drm_device *dev,
                 vsize = (hsize * 4) / 5;
         else
                 vsize = (hsize * 9) / 16;
-
+        /* HDTV hack */
+        if (hsize == 1360 && vsize == 765 && vrefresh_rate == 60) {
+                mode = drm_cvt_mode(dev, hsize, vsize, vrefresh_rate, 0, 0);
+                mode->hdisplay = 1366;
+                mode->vsync_start = mode->vsync_start - 1;
+                mode->vsync_end = mode->vsync_end - 1;
+                return mode;
+        }
         mode = NULL;
+        /* check whether it can be found in default mode table */
+        mode = drm_find_dmt(dev, hsize, vsize, vrefresh_rate);
+        if (mode)
+                return mode;
+
         switch (timing_level) {
         case LEVEL_DMT:
-                mode = drm_mode_create(dev);
-                if (mode) {
-                        mode->hdisplay = hsize;
-                        mode->vdisplay = vsize;
-                        drm_mode_set_name(mode);
-                }
                 break;
         case LEVEL_GTF:
                 mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0);