For now, let's just look at the 3D_present flag of the CEA HDMI vendor block to detect if the sink supports a small list of then mandatory 3D formats.
See the HDMI 1.4a 3D extraction for detail: http://www.hdmi.org/manufacturer/specification.aspx
v2: Rename freq to vrefresh, make the mandatory structure a bit more compact, fix some white space issues and add a couple of const (Ville Syrjälä)
Signed-off-by: Damien Lespiau damien.lespiau@intel.com --- drivers/gpu/drm/drm_edid.c | 110 ++++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 103 insertions(+), 7 deletions(-)
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index 1688ff5..52e6087 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -2553,13 +2553,95 @@ do_cea_modes(struct drm_connector *connector, const u8 *db, u8 len) return modes; }
+struct stereo_mandatory_mode { + int width, height, vrefresh; + unsigned int flags; +}; + +static const struct stereo_mandatory_mode stereo_mandatory_modes[] = { + { 1920, 1080, 24, + DRM_MODE_FLAG_3D_TOP_AND_BOTTOM | DRM_MODE_FLAG_3D_FRAME_PACKING }, + { 1920, 1080, 50, + DRM_MODE_FLAG_INTERLACE | DRM_MODE_FLAG_3D_SIDE_BY_SIDE_HALF }, + { 1920, 1080, 60, + DRM_MODE_FLAG_INTERLACE | DRM_MODE_FLAG_3D_SIDE_BY_SIDE_HALF }, + { 1280, 720, 50, + DRM_MODE_FLAG_3D_TOP_AND_BOTTOM | DRM_MODE_FLAG_3D_FRAME_PACKING }, + { 1280, 720, 60, + DRM_MODE_FLAG_3D_TOP_AND_BOTTOM | DRM_MODE_FLAG_3D_FRAME_PACKING } +}; + +static bool +stereo_match_mandatory(const struct drm_display_mode *mode, + const struct stereo_mandatory_mode *stereo_mode) +{ + unsigned int interlaced = mode->flags & DRM_MODE_FLAG_INTERLACE; + + return mode->hdisplay == stereo_mode->width && + mode->vdisplay == stereo_mode->height && + interlaced == (stereo_mode->flags & DRM_MODE_FLAG_INTERLACE) && + drm_mode_vrefresh(mode) == stereo_mode->vrefresh; +} + +static const struct stereo_mandatory_mode * +hdmi_find_stereo_mandatory_mode(const struct drm_display_mode *mode) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(stereo_mandatory_modes); i++) + if (stereo_match_mandatory(mode, &stereo_mandatory_modes[i])) + return &stereo_mandatory_modes[i]; + + return NULL; +} + +static int add_hdmi_mandatory_stereo_modes(struct drm_connector *connector) +{ + struct drm_device *dev = connector->dev; + const struct drm_display_mode *mode; + struct list_head stereo_modes; + int modes = 0; + + INIT_LIST_HEAD(&stereo_modes); + + list_for_each_entry(mode, &connector->probed_modes, head) { + const struct stereo_mandatory_mode *mandatory; + u32 stereo_layouts, layout; + + mandatory = hdmi_find_stereo_mandatory_mode(mode); + if (!mandatory) + continue; + + stereo_layouts = mandatory->flags & DRM_MODE_FLAG_3D_MASK; + do { + struct drm_display_mode *new_mode; + + layout = 1 << (ffs(stereo_layouts) - 1); + stereo_layouts &= ~layout; + + new_mode = drm_mode_duplicate(dev, mode); + if (!new_mode) + continue; + + new_mode->flags |= layout; + list_add_tail(&new_mode->head, &stereo_modes); + modes++; + } while (stereo_layouts); + } + + list_splice_tail(&stereo_modes, &connector->probed_modes); + + return modes; +} + /* * do_hdmi_vsdb_modes - Parse the HDMI Vendor Specific data block * @connector: connector corresponding to the HDMI sink * @db: start of the CEA vendor specific block * @len: length of the CEA block payload, ie. one can access up to db[len] * - * Parses the HDMI VSDB looking for modes to add to @connector. + * Parses the HDMI VSDB looking for modes to add to @connector. This function + * also adds the stereo 3d modes when applicable. */ static int do_hdmi_vsdb_modes(struct drm_connector *connector, const u8 *db, u8 len) @@ -2585,10 +2667,15 @@ do_hdmi_vsdb_modes(struct drm_connector *connector, const u8 *db, u8 len)
/* the declared length is not long enough for the 2 first bytes * of additional video format capabilities */ - offset += 2; - if (len < (8 + offset)) + if (len < (8 + offset + 2)) goto out;
+ /* 3D_Present */ + offset++; + if (db[8 + offset] & (1 << 7)) + modes += add_hdmi_mandatory_stereo_modes(connector); + + offset++; vic_len = db[8 + offset] >> 5;
for (i = 0; i < vic_len && len >= (9 + offset + i); i++) { @@ -2668,8 +2755,8 @@ static int add_cea_modes(struct drm_connector *connector, struct edid *edid) { const u8 *cea = drm_find_cea_extension(edid); - const u8 *db; - u8 dbl; + const u8 *db, *hdmi = NULL; + u8 dbl, hdmi_len; int modes = 0;
if (cea && cea_revision(cea) >= 3) { @@ -2684,11 +2771,20 @@ add_cea_modes(struct drm_connector *connector, struct edid *edid)
if (cea_db_tag(db) == VIDEO_BLOCK) modes += do_cea_modes(connector, db + 1, dbl); - else if (cea_db_is_hdmi_vsdb(db)) - modes += do_hdmi_vsdb_modes(connector, db, dbl); + else if (cea_db_is_hdmi_vsdb(db)) { + hdmi = db; + hdmi_len = dbl; + } } }
+ /* + * We parse the HDMI VSDB after having added the cea modes as we will + * be patching their flags when the sink supports stereo 3D. + */ + if (hdmi) + modes += do_hdmi_vsdb_modes(connector, hdmi, hdmi_len); + return modes; }