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| author |   Thierry Reding <treding@nvidia.com> | 2017-03-13 16:54:00 +0530 |
|---|---|---|
| committer |   Jani Nikula <jani.nikula@intel.com> | 2017-03-21 10:15:47 +0200 |
| commit | 50dd1bd1e2395a78e5adfad96487092e215483e0 (patch) | |
| tree | fbce279ac3bfe5069038e2e78e16d2ced1bbfc8c | |
| parent | drm: Add SCDC helpers (diff) | |
| download | linux-dev-50dd1bd1e2395a78e5adfad96487092e215483e0.tar.xz linux-dev-50dd1bd1e2395a78e5adfad96487092e215483e0.zip | |
drm/edid: check for HF-VSDB block
This patch implements a small function that finds if a
given CEA db is hdmi-forum vendor specific data block
or not.
V2: Rebase.
V3: Added R-B from Jose.
V4: Rebase
V5: Rebase
V6: Rebase
V7: Rebase
V8: Rebase
V9: Rebase
V10: Rebase
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Shashank Sharma <shashank.sharma@intel.com>
Reviewed-by: Jose Abreu <joabreu@synopsys.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1489404244-16608-3-git-send-email-shashank.sharma@intel.com
| -rw-r--r-- | drivers/gpu/drm/drm_edid.c | 15 | ||||
| -rw-r--r-- | include/linux/hdmi.h | 1 |
2 files changed, 16 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index 171d7a02ace0..92e9551f3c38 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -3248,6 +3248,21 @@ static bool cea_db_is_hdmi_vsdb(const u8 *db) return hdmi_id == HDMI_IEEE_OUI; } +static bool cea_db_is_hdmi_forum_vsdb(const u8 *db) +{ + unsigned int oui; + + if (cea_db_tag(db) != VENDOR_BLOCK) + return false; + + if (cea_db_payload_len(db) < 7) + return false; + + oui = db[3] << 16 | db[2] << 8 | db[1]; + + return oui == HDMI_FORUM_IEEE_OUI; +} + #define for_each_cea_db(cea, i, start, end) \ for ((i) = (start); (i) < (end) && (i) + cea_db_payload_len(&(cea)[(i)]) < (end); (i) += cea_db_payload_len(&(cea)[(i)]) + 1) diff --git a/include/linux/hdmi.h b/include/linux/hdmi.h index edbb4fc674ed..d271ff23984f 100644 --- a/include/linux/hdmi.h +++ b/include/linux/hdmi.h @@ -35,6 +35,7 @@ enum hdmi_infoframe_type { }; #define HDMI_IEEE_OUI 0x000c03 +#define HDMI_FORUM_IEEE_OUI 0xc45dd8 #define HDMI_INFOFRAME_HEADER_SIZE 4 #define HDMI_AVI_INFOFRAME_SIZE 13 #define HDMI_SPD_INFOFRAME_SIZE 25 |