The drm_display_info structure contains many fields related to HDMI
sinks, but none that identifies if a sink compliant with CEA-861 (EDID)
shall be treated as an HDMI sink or a DVI sink. Add such a flag, and
populate it according to section 8.3.3 ("DVI/HDMI Device
Discrimination") of the HDMI v1.3 specification.
Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
Reviewed-by: Andrzej Hajda <a.hajda@xxxxxxxxxxx>
Reviewed-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
Reviewed-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx>
Acked-by: Sam Ravnborg <sam@xxxxxxxxxxxx>
---
Changes since v1:
- Link the is_hdmi field doc with drm_detect_hdmi_monitor()
- Add a conversion task in todo.rst
---
Documentation/gpu/todo.rst | 14 ++++++++++++++
drivers/gpu/drm/drm_edid.c | 6 ++++++
include/drm/drm_connector.h | 8 ++++++++
3 files changed, 28 insertions(+)
diff --git a/Documentation/gpu/todo.rst b/Documentation/gpu/todo.rst
index 370ac678106e..ccf5e8e34222 100644
--- a/Documentation/gpu/todo.rst
+++ b/Documentation/gpu/todo.rst
@@ -407,6 +407,20 @@ Contact: Daniel Vetter
Level: Intermediate
+Replace drm_detect_hdmi_monitor() with drm_display_info.is_hdmi
+---------------------------------------------------------------
+
+Once EDID is parsed, the monitor HDMI support information is available through
+drm_display_info.is_hdmi. Many drivers still call drm_detect_hdmi_monitor() to
+retrieve the same information, which is less efficient.
+
+Audit each individual driver calling drm_detect_hdmi_monitor() and switch to
+drm_display_info.is_hdmi if applicable.
+
+Contact: Laurent Pinchart, respective driver maintainers
+
+Level: Intermediate
+
Core refactorings
=================
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 8f2d5022d0bc..6a2fcfdc7272 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -4647,6 +4647,9 @@ EXPORT_SYMBOL(drm_av_sync_delay);
*
* Parse the CEA extension according to CEA-861-B.
*
+ * Drivers that have added the modes parsed from EDID to drm_display_info
+ * should use &drm_display_info.is_hdmi instead of calling this function.
+ *
* Return: True if the monitor is HDMI, false if not or unknown.
*/
bool drm_detect_hdmi_monitor(struct edid *edid)
@@ -4881,6 +4884,8 @@ drm_parse_hdmi_vsdb_video(struct drm_connector *connector, const u8 *db)
struct drm_display_info *info = &connector->display_info;
u8 len = cea_db_payload_len(db);
+ info->is_hdmi = true;
+
if (len >= 6)
info->dvi_dual = db[6] & 1;
if (len >= 7)
@@ -4949,6 +4954,7 @@ drm_reset_display_info(struct drm_connector *connector)
info->cea_rev = 0;
info->max_tmds_clock = 0;
info->dvi_dual = false;
+ info->is_hdmi = false;
info->has_hdmi_infoframe = false;
info->rgb_quant_range_selectable = false;
memset(&info->hdmi, 0, sizeof(info->hdmi));
diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index c3bd5262db9c..0df7a95ca5d9 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -434,6 +434,14 @@ struct drm_display_info {
*/
bool dvi_dual;
+ /**
+ * @is_hdmi: True if the sink is an HDMI device.
+ *
+ * This field shall be used instead of calling
+ * drm_detect_hdmi_monitor() when possible.
+ */
+ bool is_hdmi;
+
/**
* @has_hdmi_infoframe: Does the sink support the HDMI infoframe?
*/
--
Regards,
Laurent Pinchart
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