drm/edid/quirks: ViewSonic VA2026w

commit bc42aabc6a01b92b0f961d65671564e0e1cd7592 upstream.

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>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index a1ee634c9850982b192209a25db3d88dc91e0d84..53c3d7f377c66471bb8a2e4b3aa0a0a26d2c00ea 100644 (file)
--- 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 ***/
@@ -863,12 +868,19 @@ 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);
 
@@ -892,8 +904,6 @@ 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;
        }
@@ -903,6 +913,7 @@ 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;
 
@@ -916,6 +927,9 @@ 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;
 }