cf. https://bugzilla.redhat.com/show_bug.cgi?id=533561
Signed-off-by: Adam Jackson <a...@redhat.com>
---
drivers/gpu/drm/drm_edid.c | 47 ++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 45 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index f665b05..ab6c973 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -598,6 +598,50 @@ struct drm_display_mode *drm_mode_std(struct drm_device
*dev,
return mode;
}
+/*
+ * EDID is delightfully ambiguous about how interlaced modes are to be
+ * encoded. Our internal representation is of frame height, but some
+ * HDTV detailed timings are encoded as field height.
+ *
+ * The format list here is from CEA, in frame size. Technically we
+ * should be checking refresh rate too. Whatever.
+ */
+static void
+drm_mode_do_interlace_quirk(struct drm_display_mode *mode,
+ struct detailed_pixel_timing *pt)
+{
+ int i;
+ static const struct {
+ int w, h;
+ } cea_interlaced[] = {
+ { 1920, 1080 },
+ { 720, 480 },
+ { 1440, 480 },
+ { 2880, 480 },
+ { 720, 576 },
+ { 1440, 576 },
+ { 2880, 576 },
+ };
+ static const int n_sizes =
+ sizeof(cea_interlaced)/sizeof(cea_interlaced[0]);
+
+ if (!(pt->misc & DRM_EDID_PT_INTERLACED))
+ return;
+
+ for (i = 0; i < n_sizes; i++) {
+ if ((mode->hdisplay == cea_interlaced[i].w) &&
+ (mode->vdisplay == cea_interlaced[i].h / 2)) {
+ mode->vdisplay *= 2;
+ mode->vsync_start *= 2;
+ mode->vsync_end *= 2;
+ mode->vtotal *= 2;
+ mode->vtotal |= 1;
+ }
+ }
+
+ mode->flags |= DRM_MODE_FLAG_INTERLACE;
+}
+
/**
* drm_mode_detailed - create a new mode from an EDID detailed timing section
* @dev: DRM device (needed to create new mode)
@@ -680,8 +724,7 @@ static struct drm_display_mode *drm_mode_detailed(struct
drm_device *dev,
drm_mode_set_name(mode);
- if (pt->misc & DRM_EDID_PT_INTERLACED)
- mode->flags |= DRM_MODE_FLAG_INTERLACE;
+ drm_mode_do_interlace_quirk(mode, pt);
if (quirks & EDID_QUIRK_DETAILED_SYNC_PP) {
pt->misc |= DRM_EDID_PT_HSYNC_POSITIVE |
DRM_EDID_PT_VSYNC_POSITIVE;
--
1.6.5.2
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