[v4 0/5] enhanced edid driver compatibility

[v4 0/5] enhanced edid driver compatibility

[Lee Shawn C]

Support to parse multiple CEA extension blocks and HF-EEODB to
extend drm edid driver's capability.

v4: add one more patch to support HF-SCDB

Lee Shawn C (5):
  drm/edid: seek for available CEA block from specific EDID block index
  drm/edid: parse multiple CEA extension block
  drm/edid: read HF-EEODB ext block
  drm/edid: parse HF-EEODB CEA extension block
  drm/edid: check for HF-SCDB block

 drivers/gpu/drm/drm_connector.c |   8 +-
 drivers/gpu/drm/drm_displayid.c |   5 +-
 drivers/gpu/drm/drm_edid.c      | 194 +++++++++++++++++++++++++-------
 include/drm/drm_edid.h          |   4 +-
 4 files changed, 164 insertions(+), 47 deletions(-)

-- 
2.17.1

[v4 1/5] drm/edid: seek for available CEA block from specific EDID block index

[Lee Shawn C]

drm_find_cea_extension() always look for a top level CEA block. Pass
ext_index from caller then this function to search next available
CEA ext block from a specific EDID block pointer.

Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Signed-off-by: Lee Shawn C <shawn.c.lee@intel.com>
---
 drivers/gpu/drm/drm_edid.c | 42 ++++++++++++++++++--------------------
 1 file changed, 20 insertions(+), 22 deletions(-)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index a504542238ed..375e70d9de86 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -3353,16 +3353,14 @@ const u8 *drm_find_edid_extension(const struct edid *edid,
 	return edid_ext;
 }
 
-static const u8 *drm_find_cea_extension(const struct edid *edid)
+static const u8 *drm_find_cea_extension(const struct edid *edid, int *ext_index)
 {
 	const struct displayid_block *block;
 	struct displayid_iter iter;
 	const u8 *cea;
-	int ext_index = 0;
 
-	/* Look for a top level CEA extension block */
-	/* FIXME: make callers iterate through multiple CEA ext blocks? */
-	cea = drm_find_edid_extension(edid, CEA_EXT, &ext_index);
+	/* Look for a CEA extension block from ext_index */
+	cea = drm_find_edid_extension(edid, CEA_EXT, ext_index);
 	if (cea)
 		return cea;
 
@@ -3643,10 +3641,10 @@ add_alternate_cea_modes(struct drm_connector *connector, struct edid *edid)
 	struct drm_device *dev = connector->dev;
 	struct drm_display_mode *mode, *tmp;
 	LIST_HEAD(list);
-	int modes = 0;
+	int modes = 0, ext_index = 0;
 
 	/* Don't add CEA modes if the CEA extension block is missing */
-	if (!drm_find_cea_extension(edid))
+	if (!drm_find_cea_extension(edid, &ext_index))
 		return 0;
 
 	/*
@@ -4321,11 +4319,11 @@ static void drm_parse_y420cmdb_bitmap(struct drm_connector *connector,
 static int
 add_cea_modes(struct drm_connector *connector, struct edid *edid)
 {
-	const u8 *cea = drm_find_cea_extension(edid);
-	const u8 *db, *hdmi = NULL, *video = NULL;
+	const u8 *cea, *db, *hdmi = NULL, *video = NULL;
 	u8 dbl, hdmi_len, video_len = 0;
-	int modes = 0;
+	int modes = 0, ext_index = 0;
 
+	cea = drm_find_cea_extension(edid, &ext_index);
 	if (cea && cea_revision(cea) >= 3) {
 		int i, start, end;
 
@@ -4562,7 +4560,7 @@ static void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid)
 	uint8_t *eld = connector->eld;
 	const u8 *cea;
 	const u8 *db;
-	int total_sad_count = 0;
+	int total_sad_count = 0, ext_index = 0;
 	int mnl;
 	int dbl;
 
@@ -4571,7 +4569,7 @@ static void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid)
 	if (!edid)
 		return;
 
-	cea = drm_find_cea_extension(edid);
+	cea = drm_find_cea_extension(edid, &ext_index);
 	if (!cea) {
 		DRM_DEBUG_KMS("ELD: no CEA Extension found\n");
 		return;
@@ -4655,11 +4653,11 @@ static void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid)
  */
 int drm_edid_to_sad(struct edid *edid, struct cea_sad **sads)
 {
-	int count = 0;
+	int count = 0, ext_index = 0;
 	int i, start, end, dbl;
 	const u8 *cea;
 
-	cea = drm_find_cea_extension(edid);
+	cea = drm_find_cea_extension(edid, &ext_index);
 	if (!cea) {
 		DRM_DEBUG_KMS("SAD: no CEA Extension found\n");
 		return 0;
@@ -4717,11 +4715,11 @@ EXPORT_SYMBOL(drm_edid_to_sad);
  */
 int drm_edid_to_speaker_allocation(struct edid *edid, u8 **sadb)
 {
-	int count = 0;
+	int count = 0, ext_index = 0;
 	int i, start, end, dbl;
 	const u8 *cea;
 
-	cea = drm_find_cea_extension(edid);
+	cea = drm_find_cea_extension(edid, &ext_index);
 	if (!cea) {
 		DRM_DEBUG_KMS("SAD: no CEA Extension found\n");
 		return 0;
@@ -4814,9 +4812,9 @@ bool drm_detect_hdmi_monitor(struct edid *edid)
 {
 	const u8 *edid_ext;
 	int i;
-	int start_offset, end_offset;
+	int start_offset, end_offset, ext_index = 0;
 
-	edid_ext = drm_find_cea_extension(edid);
+	edid_ext = drm_find_cea_extension(edid, &ext_index);
 	if (!edid_ext)
 		return false;
 
@@ -4853,9 +4851,9 @@ bool drm_detect_monitor_audio(struct edid *edid)
 	const u8 *edid_ext;
 	int i, j;
 	bool has_audio = false;
-	int start_offset, end_offset;
+	int start_offset, end_offset, ext_index = 0;
 
-	edid_ext = drm_find_cea_extension(edid);
+	edid_ext = drm_find_cea_extension(edid, &ext_index);
 	if (!edid_ext)
 		goto end;
 
@@ -5177,9 +5175,9 @@ static void drm_parse_cea_ext(struct drm_connector *connector,
 {
 	struct drm_display_info *info = &connector->display_info;
 	const u8 *edid_ext;
-	int i, start, end;
+	int i, start, end, ext_index = 0;
 
-	edid_ext = drm_find_cea_extension(edid);
+	edid_ext = drm_find_cea_extension(edid, &ext_index);
 	if (!edid_ext)
 		return;
 
-- 
2.17.1

[v4 2/5] drm/edid: parse multiple CEA extension block

[Lee Shawn C]

Try to find and parse more CEA ext blocks if edid->extensions
is greater than one.

v2: split prvious patch to two. And do CEA block parsing
    in this one.
v3: simplify this patch based on previous change.

Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Signed-off-by: Lee Shawn C <shawn.c.lee@intel.com>
---
 drivers/gpu/drm/drm_edid.c | 36 ++++++++++++++++++++++--------------
 1 file changed, 22 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 375e70d9de86..c4a47465ba76 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -4319,16 +4319,24 @@ static void drm_parse_y420cmdb_bitmap(struct drm_connector *connector,
 static int
 add_cea_modes(struct drm_connector *connector, struct edid *edid)
 {
-	const u8 *cea, *db, *hdmi = NULL, *video = NULL;
-	u8 dbl, hdmi_len, video_len = 0;
+	const u8 *cea, *db;
+	u8 dbl, hdmi_len;
 	int modes = 0, ext_index = 0;
+	int i, start, end;
 
-	cea = drm_find_cea_extension(edid, &ext_index);
-	if (cea && cea_revision(cea) >= 3) {
-		int i, start, end;
+	for (;;) {
+		const u8 *hdmi = NULL, *video = NULL;
+		u8 video_len = 0;
+
+		cea = drm_find_cea_extension(edid, &ext_index);
+		if (!cea)
+			break;
+
+		if (cea_revision(cea) < 3)
+			continue;
 
 		if (cea_db_offsets(cea, &start, &end))
-			return 0;
+			continue;
 
 		for_each_cea_db(cea, i, start, end) {
 			db = &cea[i];
@@ -4350,15 +4358,15 @@ add_cea_modes(struct drm_connector *connector, struct edid *edid)
 							  dbl - 1);
 			}
 		}
-	}
 
-	/*
-	 * 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, video,
-					    video_len);
+		/*
+		 * 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, video,
+						    video_len);
+	}
 
 	return modes;
 }
-- 
2.17.1

[v4 3/5] drm/edid: read HF-EEODB ext block

[Lee Shawn C]

According to HDMI 2.1 spec.

"The HDMI Forum EDID Extension Override Data Block (HF-EEODB)
is utilized by Sink Devices to provide an alternate method to
indicate an EDID Extension Block count larger than 1, while
avoiding the need to present a VESA Block Map in the first
E-EDID Extension Block."

It is a mandatory for HDMI 2.1 protocol compliance as well.
This patch help to know how many HF_EEODB blocks report by sink
and read allo HF_EEODB blocks back.

v2: support to find CEA block, check EEODB block format, and return
    available block number in drm_edid_read_hf_eeodb_blk_count().

Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Signed-off-by: Lee Shawn C <shawn.c.lee@intel.com>
---
 drivers/gpu/drm/drm_connector.c |  8 +++-
 drivers/gpu/drm/drm_edid.c      | 71 +++++++++++++++++++++++++++++++--
 include/drm/drm_edid.h          |  2 +-
 3 files changed, 74 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index a50c82bc2b2f..16011023c12e 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -2129,7 +2129,7 @@ int drm_connector_update_edid_property(struct drm_connector *connector,
 				       const struct edid *edid)
 {
 	struct drm_device *dev = connector->dev;
-	size_t size = 0;
+	size_t size = 0, hf_eeodb_blk_count;
 	int ret;
 	const struct edid *old_edid;
 
@@ -2137,8 +2137,12 @@ int drm_connector_update_edid_property(struct drm_connector *connector,
 	if (connector->override_edid)
 		return 0;
 
-	if (edid)
+	if (edid) {
 		size = EDID_LENGTH * (1 + edid->extensions);
+		hf_eeodb_blk_count = drm_edid_read_hf_eeodb_blk_count(edid);
+		if (hf_eeodb_blk_count)
+			size = EDID_LENGTH * (1 + hf_eeodb_blk_count);
+	}
 
 	/* Set the display info, using edid if available, otherwise
 	 * resetting the values to defaults. This duplicates the work
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index c4a47465ba76..e5ac9ab0b9d0 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -1992,6 +1992,7 @@ struct edid *drm_do_get_edid(struct drm_connector *connector,
 {
 	int i, j = 0, valid_extensions = 0;
 	u8 *edid, *new;
+	size_t hf_eeodb_blk_count;
 	struct edid *override;
 
 	override = drm_get_override_edid(connector);
@@ -2051,7 +2052,35 @@ struct edid *drm_do_get_edid(struct drm_connector *connector,
 		}
 
 		kfree(edid);
+		return (struct edid *)new;
+	}
+
+	hf_eeodb_blk_count = drm_edid_read_hf_eeodb_blk_count((struct edid *)edid);
+	if (hf_eeodb_blk_count >= 2) {
+		new = krealloc(edid, (hf_eeodb_blk_count + 1) * EDID_LENGTH, GFP_KERNEL);
+		if (!new)
+			goto out;
 		edid = new;
+
+		valid_extensions = hf_eeodb_blk_count - 1;
+		for (j = 2; j <= hf_eeodb_blk_count; j++) {
+			u8 *block = edid + j * EDID_LENGTH;
+
+			for (i = 0; i < 4; i++) {
+				if (get_edid_block(data, block, j, EDID_LENGTH))
+					goto out;
+				if (drm_edid_block_valid(block, j, false, NULL))
+					break;
+			}
+
+			if (i == 4)
+				valid_extensions--;
+		}
+
+		if (valid_extensions != hf_eeodb_blk_count - 1) {
+			DRM_ERROR("Not able to retrieve proper EDID contain HF-EEODB data.\n");
+			goto out;
+		}
 	}
 
 	return (struct edid *)edid;
@@ -3315,15 +3344,17 @@ add_detailed_modes(struct drm_connector *connector, struct edid *edid,
 #define VIDEO_BLOCK     0x02
 #define VENDOR_BLOCK    0x03
 #define SPEAKER_BLOCK	0x04
-#define HDR_STATIC_METADATA_BLOCK	0x6
-#define USE_EXTENDED_TAG 0x07
-#define EXT_VIDEO_CAPABILITY_BLOCK 0x00
+#define EXT_VIDEO_CAPABILITY_BLOCK	0x00
+#define HDR_STATIC_METADATA_BLOCK	0x06
+#define USE_EXTENDED_TAG		0x07
 #define EXT_VIDEO_DATA_BLOCK_420	0x0E
-#define EXT_VIDEO_CAP_BLOCK_Y420CMDB 0x0F
+#define EXT_VIDEO_CAP_BLOCK_Y420CMDB	0x0F
+#define EXT_VIDEO_HF_EEODB_DATA_BLOCK	0x78
 #define EDID_BASIC_AUDIO	(1 << 6)
 #define EDID_CEA_YCRCB444	(1 << 5)
 #define EDID_CEA_YCRCB422	(1 << 4)
 #define EDID_CEA_VCDB_QS	(1 << 6)
+#define HF_EEODB_LENGTH		2
 
 /*
  * Search EDID for CEA extension block.
@@ -4273,9 +4304,41 @@ static bool cea_db_is_y420vdb(const u8 *db)
 	return true;
 }
 
+static bool cea_db_is_hdmi_forum_eeodb(const u8 *db)
+{
+	if (cea_db_tag(db) != USE_EXTENDED_TAG)
+		return false;
+
+	if (cea_db_payload_len(db) != HF_EEODB_LENGTH)
+		return false;
+
+	if (cea_db_extended_tag(db) != EXT_VIDEO_HF_EEODB_DATA_BLOCK)
+		return false;
+
+	return true;
+}
+
 #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)
 
+size_t drm_edid_read_hf_eeodb_blk_count(const struct edid *edid)
+{
+	const u8 *cea;
+	int i, start, end, ext_index = 0;
+
+	if (edid->extensions) {
+		cea = drm_find_cea_extension(edid, &ext_index);
+
+		if (cea && !cea_db_offsets(cea, &start, &end))
+			for_each_cea_db(cea, i, start, end)
+				if (cea_db_is_hdmi_forum_eeodb(&cea[i]))
+					return cea[i + 2];
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(drm_edid_read_hf_eeodb_blk_count);
+
 static void drm_parse_y420cmdb_bitmap(struct drm_connector *connector,
 				      const u8 *db)
 {
diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
index 144c495b99c4..5549da7bd7be 100644
--- a/include/drm/drm_edid.h
+++ b/include/drm/drm_edid.h
@@ -592,6 +592,6 @@ drm_display_mode_from_cea_vic(struct drm_device *dev,
 			      u8 video_code);
 const u8 *drm_find_edid_extension(const struct edid *edid,
 				  int ext_id, int *ext_index);
-
+size_t drm_edid_read_hf_eeodb_blk_count(const struct edid *edid);
 
 #endif /* __DRM_EDID_H__ */
-- 
2.17.1

[v4 4/5] drm/edid: parse HF-EEODB CEA extension block

[Lee Shawn C]

While adding CEA modes, try to get available EEODB block
number. Then based on it to parse numbers of ext blocks,
retrieve CEA information and add more CEA modes.

Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Signed-off-by: Lee Shawn C <shawn.c.lee@intel.com>
---
 drivers/gpu/drm/drm_displayid.c |  5 ++++-
 drivers/gpu/drm/drm_edid.c      | 35 +++++++++++++++++++--------------
 include/drm/drm_edid.h          |  2 +-
 3 files changed, 25 insertions(+), 17 deletions(-)

diff --git a/drivers/gpu/drm/drm_displayid.c b/drivers/gpu/drm/drm_displayid.c
index 32da557b960f..dc649a9efaa2 100644
--- a/drivers/gpu/drm/drm_displayid.c
+++ b/drivers/gpu/drm/drm_displayid.c
@@ -37,7 +37,10 @@ static const u8 *drm_find_displayid_extension(const struct edid *edid,
 					      int *length, int *idx,
 					      int *ext_index)
 {
-	const u8 *displayid = drm_find_edid_extension(edid, DISPLAYID_EXT, ext_index);
+	const u8 *displayid = drm_find_edid_extension(edid,
+						      DISPLAYID_EXT,
+						      ext_index,
+						      edid->extensions);
 	const struct displayid_header *base;
 	int ret;
 
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index e5ac9ab0b9d0..2b8ddc956ce2 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -3360,23 +3360,23 @@ add_detailed_modes(struct drm_connector *connector, struct edid *edid,
  * Search EDID for CEA extension block.
  */
 const u8 *drm_find_edid_extension(const struct edid *edid,
-				  int ext_id, int *ext_index)
+				  int ext_id, int *ext_index, int ext_blk_num)
 {
 	const u8 *edid_ext = NULL;
 	int i;
 
 	/* No EDID or EDID extensions */
-	if (edid == NULL || edid->extensions == 0)
+	if (edid == NULL || edid->extensions == 0 || *ext_index >= ext_blk_num)
 		return NULL;
 
 	/* Find CEA extension */
-	for (i = *ext_index; i < edid->extensions; i++) {
+	for (i = *ext_index; i < ext_blk_num; i++) {
 		edid_ext = (const u8 *)edid + EDID_LENGTH * (i + 1);
 		if (edid_ext[0] == ext_id)
 			break;
 	}
 
-	if (i >= edid->extensions)
+	if (i >= ext_blk_num)
 		return NULL;
 
 	*ext_index = i + 1;
@@ -3384,14 +3384,15 @@ const u8 *drm_find_edid_extension(const struct edid *edid,
 	return edid_ext;
 }
 
-static const u8 *drm_find_cea_extension(const struct edid *edid, int *ext_index)
+static const u8 *drm_find_cea_extension(const struct edid *edid,
+					int *ext_index, int ext_blk_num)
 {
 	const struct displayid_block *block;
 	struct displayid_iter iter;
 	const u8 *cea;
 
 	/* Look for a CEA extension block from ext_index */
-	cea = drm_find_edid_extension(edid, CEA_EXT, ext_index);
+	cea = drm_find_edid_extension(edid, CEA_EXT, ext_index, ext_blk_num);
 	if (cea)
 		return cea;
 
@@ -3675,7 +3676,7 @@ add_alternate_cea_modes(struct drm_connector *connector, struct edid *edid)
 	int modes = 0, ext_index = 0;
 
 	/* Don't add CEA modes if the CEA extension block is missing */
-	if (!drm_find_cea_extension(edid, &ext_index))
+	if (!drm_find_cea_extension(edid, &ext_index, edid->extensions))
 		return 0;
 
 	/*
@@ -4327,7 +4328,7 @@ size_t drm_edid_read_hf_eeodb_blk_count(const struct edid *edid)
 	int i, start, end, ext_index = 0;
 
 	if (edid->extensions) {
-		cea = drm_find_cea_extension(edid, &ext_index);
+		cea = drm_find_cea_extension(edid, &ext_index, edid->extensions);
 
 		if (cea && !cea_db_offsets(cea, &start, &end))
 			for_each_cea_db(cea, i, start, end)
@@ -4386,12 +4387,16 @@ add_cea_modes(struct drm_connector *connector, struct edid *edid)
 	u8 dbl, hdmi_len;
 	int modes = 0, ext_index = 0;
 	int i, start, end;
+	int ext_blk_num = drm_edid_read_hf_eeodb_blk_count(edid);
+
+	if (!ext_blk_num)
+		ext_blk_num = edid->extensions;
 
 	for (;;) {
 		const u8 *hdmi = NULL, *video = NULL;
 		u8 video_len = 0;
 
-		cea = drm_find_cea_extension(edid, &ext_index);
+		cea = drm_find_cea_extension(edid, &ext_index, ext_blk_num);
 		if (!cea)
 			break;
 
@@ -4640,7 +4645,7 @@ static void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid)
 	if (!edid)
 		return;
 
-	cea = drm_find_cea_extension(edid, &ext_index);
+	cea = drm_find_cea_extension(edid, &ext_index, edid->extensions);
 	if (!cea) {
 		DRM_DEBUG_KMS("ELD: no CEA Extension found\n");
 		return;
@@ -4728,7 +4733,7 @@ int drm_edid_to_sad(struct edid *edid, struct cea_sad **sads)
 	int i, start, end, dbl;
 	const u8 *cea;
 
-	cea = drm_find_cea_extension(edid, &ext_index);
+	cea = drm_find_cea_extension(edid, &ext_index, edid->extensions);
 	if (!cea) {
 		DRM_DEBUG_KMS("SAD: no CEA Extension found\n");
 		return 0;
@@ -4790,7 +4795,7 @@ int drm_edid_to_speaker_allocation(struct edid *edid, u8 **sadb)
 	int i, start, end, dbl;
 	const u8 *cea;
 
-	cea = drm_find_cea_extension(edid, &ext_index);
+	cea = drm_find_cea_extension(edid, &ext_index, edid->extensions);
 	if (!cea) {
 		DRM_DEBUG_KMS("SAD: no CEA Extension found\n");
 		return 0;
@@ -4885,7 +4890,7 @@ bool drm_detect_hdmi_monitor(struct edid *edid)
 	int i;
 	int start_offset, end_offset, ext_index = 0;
 
-	edid_ext = drm_find_cea_extension(edid, &ext_index);
+	edid_ext = drm_find_cea_extension(edid, &ext_index, edid->extensions);
 	if (!edid_ext)
 		return false;
 
@@ -4924,7 +4929,7 @@ bool drm_detect_monitor_audio(struct edid *edid)
 	bool has_audio = false;
 	int start_offset, end_offset, ext_index = 0;
 
-	edid_ext = drm_find_cea_extension(edid, &ext_index);
+	edid_ext = drm_find_cea_extension(edid, &ext_index, edid->extensions);
 	if (!edid_ext)
 		goto end;
 
@@ -5248,7 +5253,7 @@ static void drm_parse_cea_ext(struct drm_connector *connector,
 	const u8 *edid_ext;
 	int i, start, end, ext_index = 0;
 
-	edid_ext = drm_find_cea_extension(edid, &ext_index);
+	edid_ext = drm_find_cea_extension(edid, &ext_index, edid->extensions);
 	if (!edid_ext)
 		return;
 
diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
index 5549da7bd7be..5555b27e92f9 100644
--- a/include/drm/drm_edid.h
+++ b/include/drm/drm_edid.h
@@ -591,7 +591,7 @@ struct drm_display_mode *
 drm_display_mode_from_cea_vic(struct drm_device *dev,
 			      u8 video_code);
 const u8 *drm_find_edid_extension(const struct edid *edid,
-				  int ext_id, int *ext_index);
+				  int ext_id, int *ext_index, int ext_blk_num);
 size_t drm_edid_read_hf_eeodb_blk_count(const struct edid *edid);
 
 #endif /* __DRM_EDID_H__ */
-- 
2.17.1

[v4 5/5] drm/edid: check for HF-SCDB block

[Lee Shawn C]

Find HF-SCDB information in CEA extensions block. And retrieve
Max_TMDS_Character_Rate that support by sink device.

Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Signed-off-by: Lee Shawn C <shawn.c.lee@intel.com>
---
 drivers/gpu/drm/drm_edid.c | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 2b8ddc956ce2..d6b48c543c23 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -3350,6 +3350,7 @@ add_detailed_modes(struct drm_connector *connector, struct edid *edid,
 #define EXT_VIDEO_DATA_BLOCK_420	0x0E
 #define EXT_VIDEO_CAP_BLOCK_Y420CMDB	0x0F
 #define EXT_VIDEO_HF_EEODB_DATA_BLOCK	0x78
+#define EXT_VIDEO_HF_SCDB_DATA_BLOCK	0x79
 #define EDID_BASIC_AUDIO	(1 << 6)
 #define EDID_CEA_YCRCB444	(1 << 5)
 #define EDID_CEA_YCRCB422	(1 << 4)
@@ -4277,6 +4278,20 @@ static bool cea_db_is_vcdb(const u8 *db)
 	return true;
 }
 
+static bool cea_db_is_hf_scdb(const u8 *db)
+{
+	if (cea_db_tag(db) != USE_EXTENDED_TAG)
+		return false;
+
+	if (cea_db_payload_len(db) < 7)
+		return false;
+
+	if (cea_db_extended_tag(db) != EXT_VIDEO_HF_SCDB_DATA_BLOCK)
+		return false;
+
+	return true;
+}
+
 static bool cea_db_is_y420cmdb(const u8 *db)
 {
 	if (cea_db_tag(db) != USE_EXTENDED_TAG)
@@ -4987,6 +5002,25 @@ static void drm_parse_vcdb(struct drm_connector *connector, const u8 *db)
 		info->rgb_quant_range_selectable = true;
 }
 
+static void drm_parse_hf_scdb(struct drm_connector *connector, const u8 *db)
+{
+	struct drm_display_info *info = &connector->display_info;
+	u32 max_tmds_clock;
+
+	DRM_DEBUG_KMS("HF-SCDB version 0x%02x\n", db[4]);
+
+	max_tmds_clock = db[5] * 5000;
+	if (info->max_tmds_clock < max_tmds_clock) {
+		info->max_tmds_clock = max_tmds_clock;
+		DRM_DEBUG_KMS("HF-SCDB: max TMDS clock %d kHz\n",
+			      info->max_tmds_clock);
+	}
+
+	/*
+	 * ToDo: Parse the remaining SCDB data if needed
+	 */
+}
+
 static
 void drm_get_max_frl_rate(int max_frl_rate, u8 *max_lanes, u8 *max_rate_per_lane)
 {
@@ -5282,6 +5316,8 @@ static void drm_parse_cea_ext(struct drm_connector *connector,
 			drm_parse_y420cmdb_bitmap(connector, db);
 		if (cea_db_is_vcdb(db))
 			drm_parse_vcdb(connector, db);
+		if (cea_db_is_hf_scdb(db))
+			drm_parse_hf_scdb(connector, db);
 		if (cea_db_is_hdmi_hdr_metadata_block(db))
 			drm_parse_hdr_metadata_block(connector, db);
 	}
-- 
2.17.1

Re: [v4 2/5] drm/edid: parse multiple CEA extension block

[Ville Syrjälä]

On Wed, Mar 02, 2022 at 05:35:08PM +0800, Lee Shawn C wrote:
> Try to find and parse more CEA ext blocks if edid->extensions
> is greater than one.
> 
> v2: split prvious patch to two. And do CEA block parsing
>     in this one.
> v3: simplify this patch based on previous change.
> 
> Cc: Jani Nikula <jani.nikula@linux.intel.com>
> Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> Cc: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
> Signed-off-by: Lee Shawn C <shawn.c.lee@intel.com>
> ---
>  drivers/gpu/drm/drm_edid.c | 36 ++++++++++++++++++++++--------------
>  1 file changed, 22 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index 375e70d9de86..c4a47465ba76 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -4319,16 +4319,24 @@ static void drm_parse_y420cmdb_bitmap(struct drm_connector *connector,
>  static int
>  add_cea_modes(struct drm_connector *connector, struct edid *edid)
>  {
> -	const u8 *cea, *db, *hdmi = NULL, *video = NULL;
> -	u8 dbl, hdmi_len, video_len = 0;
> +	const u8 *cea, *db;
> +	u8 dbl, hdmi_len;
>  	int modes = 0, ext_index = 0;
> +	int i, start, end;

I think everything here apart from modes and ext_index can
be moved into the loop.

Apart from that 1-2 look fine to me. intel-gfx wasn't cc:d however
so we have no ci results for any of this.

>  
> -	cea = drm_find_cea_extension(edid, &ext_index);
> -	if (cea && cea_revision(cea) >= 3) {
> -		int i, start, end;
> +	for (;;) {
> +		const u8 *hdmi = NULL, *video = NULL;
> +		u8 video_len = 0;
> +
> +		cea = drm_find_cea_extension(edid, &ext_index);
> +		if (!cea)
> +			break;
> +
> +		if (cea_revision(cea) < 3)
> +			continue;
>  
>  		if (cea_db_offsets(cea, &start, &end))
> -			return 0;
> +			continue;
>  
>  		for_each_cea_db(cea, i, start, end) {
>  			db = &cea[i];
> @@ -4350,15 +4358,15 @@ add_cea_modes(struct drm_connector *connector, struct edid *edid)
>  							  dbl - 1);
>  			}
>  		}
> -	}
>  
> -	/*
> -	 * 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, video,
> -					    video_len);
> +		/*
> +		 * 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, video,
> +						    video_len);
> +	}
>  
>  	return modes;
>  }
> -- 
> 2.17.1

-- 
Ville Syrjälä
Intel

Re: [v4 5/5] drm/edid: check for HF-SCDB block

[Ville Syrjälä]

On Wed, Mar 02, 2022 at 05:35:11PM +0800, Lee Shawn C wrote:
> Find HF-SCDB information in CEA extensions block. And retrieve
> Max_TMDS_Character_Rate that support by sink device.
> 
> Cc: Jani Nikula <jani.nikula@linux.intel.com>
> Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> Cc: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
> Signed-off-by: Lee Shawn C <shawn.c.lee@intel.com>
> ---
>  drivers/gpu/drm/drm_edid.c | 36 ++++++++++++++++++++++++++++++++++++
>  1 file changed, 36 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index 2b8ddc956ce2..d6b48c543c23 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -3350,6 +3350,7 @@ add_detailed_modes(struct drm_connector *connector, struct edid *edid,
>  #define EXT_VIDEO_DATA_BLOCK_420	0x0E
>  #define EXT_VIDEO_CAP_BLOCK_Y420CMDB	0x0F
>  #define EXT_VIDEO_HF_EEODB_DATA_BLOCK	0x78
> +#define EXT_VIDEO_HF_SCDB_DATA_BLOCK	0x79
>  #define EDID_BASIC_AUDIO	(1 << 6)
>  #define EDID_CEA_YCRCB444	(1 << 5)
>  #define EDID_CEA_YCRCB422	(1 << 4)
> @@ -4277,6 +4278,20 @@ static bool cea_db_is_vcdb(const u8 *db)
>  	return true;
>  }
>  
> +static bool cea_db_is_hf_scdb(const u8 *db)
> +{
> +	if (cea_db_tag(db) != USE_EXTENDED_TAG)
> +		return false;
> +
> +	if (cea_db_payload_len(db) < 7)
> +		return false;
> +
> +	if (cea_db_extended_tag(db) != EXT_VIDEO_HF_SCDB_DATA_BLOCK)
> +		return false;
> +
> +	return true;
> +}
> +
>  static bool cea_db_is_y420cmdb(const u8 *db)
>  {
>  	if (cea_db_tag(db) != USE_EXTENDED_TAG)
> @@ -4987,6 +5002,25 @@ static void drm_parse_vcdb(struct drm_connector *connector, const u8 *db)
>  		info->rgb_quant_range_selectable = true;
>  }
>  
> +static void drm_parse_hf_scdb(struct drm_connector *connector, const u8 *db)
> +{
> +	struct drm_display_info *info = &connector->display_info;
> +	u32 max_tmds_clock;
> +
> +	DRM_DEBUG_KMS("HF-SCDB version 0x%02x\n", db[4]);
> +
> +	max_tmds_clock = db[5] * 5000;
> +	if (info->max_tmds_clock < max_tmds_clock) {
> +		info->max_tmds_clock = max_tmds_clock;
> +		DRM_DEBUG_KMS("HF-SCDB: max TMDS clock %d kHz\n",
> +			      info->max_tmds_clock);
> +	}
> +
> +	/*
> +	 * ToDo: Parse the remaining SCDB data if needed
> +	 */

If I'm reading the spec right this block should contain the exact same
stuff as the HF-VSDB. We should reuse the same code for parsing both.

> +}
> +
>  static
>  void drm_get_max_frl_rate(int max_frl_rate, u8 *max_lanes, u8 *max_rate_per_lane)
>  {
> @@ -5282,6 +5316,8 @@ static void drm_parse_cea_ext(struct drm_connector *connector,
>  			drm_parse_y420cmdb_bitmap(connector, db);
>  		if (cea_db_is_vcdb(db))
>  			drm_parse_vcdb(connector, db);
> +		if (cea_db_is_hf_scdb(db))
> +			drm_parse_hf_scdb(connector, db);
>  		if (cea_db_is_hdmi_hdr_metadata_block(db))
>  			drm_parse_hdr_metadata_block(connector, db);
>  	}
> -- 
> 2.17.1

-- 
Ville Syrjälä
Intel

RE: [v4 5/5] drm/edid: check for HF-SCDB block

[Lee, Shawn C]

On Thursday, March 10, 2022 6:50 PM, Ville Syrjälä <ville.syrjala@linux.intel.com> wrote:
>On Wed, Mar 02, 2022 at 05:35:11PM +0800, Lee Shawn C wrote:
>> Find HF-SCDB information in CEA extensions block. And retrieve 
>> Max_TMDS_Character_Rate that support by sink device.
>> 
>> Cc: Jani Nikula <jani.nikula@linux.intel.com>
>> Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
>> Cc: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
>> Signed-off-by: Lee Shawn C <shawn.c.lee@intel.com>
>> ---
>>  drivers/gpu/drm/drm_edid.c | 36 ++++++++++++++++++++++++++++++++++++
>>  1 file changed, 36 insertions(+)
>> 
>> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c 
>> index 2b8ddc956ce2..d6b48c543c23 100644
>> --- a/drivers/gpu/drm/drm_edid.c
>> +++ b/drivers/gpu/drm/drm_edid.c
>> @@ -3350,6 +3350,7 @@ add_detailed_modes(struct drm_connector *connector, struct edid *edid,
>>  #define EXT_VIDEO_DATA_BLOCK_420	0x0E
>>  #define EXT_VIDEO_CAP_BLOCK_Y420CMDB	0x0F
>>  #define EXT_VIDEO_HF_EEODB_DATA_BLOCK	0x78
>> +#define EXT_VIDEO_HF_SCDB_DATA_BLOCK	0x79
>>  #define EDID_BASIC_AUDIO	(1 << 6)
>>  #define EDID_CEA_YCRCB444	(1 << 5)
>>  #define EDID_CEA_YCRCB422	(1 << 4)
>> @@ -4277,6 +4278,20 @@ static bool cea_db_is_vcdb(const u8 *db)
>>  	return true;
>>  }
>>  
>> +static bool cea_db_is_hf_scdb(const u8 *db) {
>> +	if (cea_db_tag(db) != USE_EXTENDED_TAG)
>> +		return false;
>> +
>> +	if (cea_db_payload_len(db) < 7)
>> +		return false;
>> +
>> +	if (cea_db_extended_tag(db) != EXT_VIDEO_HF_SCDB_DATA_BLOCK)
>> +		return false;
>> +
>> +	return true;
>> +}
>> +
>>  static bool cea_db_is_y420cmdb(const u8 *db)  {
>>  	if (cea_db_tag(db) != USE_EXTENDED_TAG) @@ -4987,6 +5002,25 @@ 
>> static void drm_parse_vcdb(struct drm_connector *connector, const u8 *db)
>>  		info->rgb_quant_range_selectable = true;  }
>>  
>> +static void drm_parse_hf_scdb(struct drm_connector *connector, const 
>> +u8 *db) {
>> +	struct drm_display_info *info = &connector->display_info;
>> +	u32 max_tmds_clock;
>> +
>> +	DRM_DEBUG_KMS("HF-SCDB version 0x%02x\n", db[4]);
>> +
>> +	max_tmds_clock = db[5] * 5000;
>> +	if (info->max_tmds_clock < max_tmds_clock) {
>> +		info->max_tmds_clock = max_tmds_clock;
>> +		DRM_DEBUG_KMS("HF-SCDB: max TMDS clock %d kHz\n",
>> +			      info->max_tmds_clock);
>> +	}
>> +
>> +	/*
>> +	 * ToDo: Parse the remaining SCDB data if needed
>> +	 */
>
>If I'm reading the spec right this block should contain the exact same stuff as the HF-VSDB. We should reuse the same code for parsing both.
>

Yes, you are right! HF-SCDB contain the same SCDS data packet as VSDB. I will fix it later.

Best regards,
Shawn

>> +}
>> +
>>  static
>>  void drm_get_max_frl_rate(int max_frl_rate, u8 *max_lanes, u8 
>> *max_rate_per_lane)  { @@ -5282,6 +5316,8 @@ static void 
>> drm_parse_cea_ext(struct drm_connector *connector,
>>  			drm_parse_y420cmdb_bitmap(connector, db);
>>  		if (cea_db_is_vcdb(db))
>>  			drm_parse_vcdb(connector, db);
>> +		if (cea_db_is_hf_scdb(db))
>> +			drm_parse_hf_scdb(connector, db);
>>  		if (cea_db_is_hdmi_hdr_metadata_block(db))
>>  			drm_parse_hdr_metadata_block(connector, db);
>>  	}
>> --
>> 2.17.1
>
>--
>Ville Syrjälä
>Intel
>