drm/edid/quirks: ViewSonic VA2026w

Entirely new class of fail for this one.  The detailed timings are for
normal CVT but the monitor really wanted CVT-R.

Bugzilla: http://bugzilla.redhat/com/516471
Signed-off-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 18 insertions, 4 deletions

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 608bddfc7e3..c3b5139eba7 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -66,6 +66,8 @@
 #define EDID_QUIRK_FIRST_DETAILED_PREFERRED     (1 << 5)
 /* use +hsync +vsync for detailed mode */
 #define EDID_QUIRK_DETAILED_SYNC_PP             (1 << 6)
+/* Force reduced-blanking timings for detailed modes */
+#define EDID_QUIRK_FORCE_REDUCED_BLANKING       (1 << 7)
 
 struct detailed_mode_closure {
         struct drm_connector *connector;
@@ -120,6 +122,9 @@ static struct edid_quirk {
         /* Samsung SyncMaster 22[5-6]BW */
         { "SAM", 596, EDID_QUIRK_PREFER_LARGE_60 },
         { "SAM", 638, EDID_QUIRK_PREFER_LARGE_60 },
+
+        /* ViewSonic VA2026w */
+        { "VSC", 5020, EDID_QUIRK_FORCE_REDUCED_BLANKING },
 };
 
 /*** DDC fetch and block validation ***/
@@ -885,12 +890,19 @@ static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev,
                                 "Wrong Hsync/Vsync pulse width\n");
                 return NULL;
         }
+
+        if (quirks & EDID_QUIRK_FORCE_REDUCED_BLANKING) {
+                mode = drm_cvt_mode(dev, hactive, vactive, 60, true, false, false);
+                if (!mode)
+                        return NULL;
+
+                goto set_size;
+        }
+
         mode = drm_mode_create(dev);
         if (!mode)
                 return NULL;
 
-        mode->type = DRM_MODE_TYPE_DRIVER;
-
         if (quirks & EDID_QUIRK_135_CLOCK_TOO_HIGH)
                 timing->pixel_clock = cpu_to_le16(1088);
 
@@ -914,8 +926,6 @@ static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev,
 
         drm_mode_do_interlace_quirk(mode, pt);
 
-        drm_mode_set_name(mode);
-
         if (quirks & EDID_QUIRK_DETAILED_SYNC_PP) {
                 pt->misc |= DRM_EDID_PT_HSYNC_POSITIVE | DRM_EDID_PT_VSYNC_POSITIVE;
         }
@@ -925,6 +935,7 @@ static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev,
         mode->flags |= (pt->misc & DRM_EDID_PT_VSYNC_POSITIVE) ?
                 DRM_MODE_FLAG_PVSYNC : DRM_MODE_FLAG_NVSYNC;
 
+set_size:
         mode->width_mm = pt->width_mm_lo | (pt->width_height_mm_hi & 0xf0) << 4;
         mode->height_mm = pt->height_mm_lo | (pt->width_height_mm_hi & 0xf) << 8;
 
@@ -938,6 +949,9 @@ static struct drm_display_mode *drm_mode_detailed(struct drm_device *dev,
                 mode->height_mm = edid->height_cm * 10;
         }
 
+        mode->type = DRM_MODE_TYPE_DRIVER;
+        drm_mode_set_name(mode);
+
         return mode;
 }