* [PATCH 1/4] include/uapi/linux/cec*.h: add CEC LIP support
2026-05-06 13:34 [PATCH 0/4] media: cec: add CEC LIP support Hans Verkuil
@ 2026-05-06 13:34 ` Hans Verkuil
2026-05-06 13:34 ` [PATCH 2/4] Documentation: media: add CEC opcodes Hans Verkuil
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: Hans Verkuil @ 2026-05-06 13:34 UTC (permalink / raw)
To: linux-media; +Cc: Hans Verkuil
Add support for the new Latency Indication Protocol feature.
This adds the opcodes and the wrapper functions.
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>
---
include/uapi/linux/cec-funcs.h | 182 +++++++++++++++++++++++++++++++++
include/uapi/linux/cec.h | 24 +++++
2 files changed, 206 insertions(+)
diff --git a/include/uapi/linux/cec-funcs.h b/include/uapi/linux/cec-funcs.h
index 189ecf0e13cd..416ecc819799 100644
--- a/include/uapi/linux/cec-funcs.h
+++ b/include/uapi/linux/cec-funcs.h
@@ -1701,6 +1701,188 @@ static inline void cec_ops_request_current_latency(const struct cec_msg *msg,
}
+/* Latency Indication Protocol Feature */
+/* Only for CEC 2.0 and up */
+static inline void cec_msg_request_lip_support(struct cec_msg *msg,
+ int reply, __u16 phys_addr)
+{
+ msg->len = 4;
+ msg->msg[1] = CEC_MSG_REQUEST_LIP_SUPPORT;
+ msg->msg[2] = phys_addr >> 8;
+ msg->msg[3] = phys_addr & 0xff;
+ msg->reply = reply ? CEC_MSG_REPORT_LIP_SUPPORT : 0;
+}
+
+static inline void cec_ops_request_lip_support(const struct cec_msg *msg,
+ __u16 *phys_addr)
+{
+ *phys_addr = (msg->msg[2] << 8) | msg->msg[3];
+}
+
+static inline void cec_msg_report_lip_support(struct cec_msg *msg, __u32 sqid)
+{
+ msg->len = 6;
+ msg->msg[1] = CEC_MSG_REPORT_LIP_SUPPORT;
+ msg->msg[2] = sqid >> 24;
+ msg->msg[3] = (sqid >> 16) & 0xff;
+ msg->msg[4] = (sqid >> 8) & 0xff;
+ msg->msg[5] = sqid & 0xff;
+}
+
+static inline void cec_ops_report_lip_support(const struct cec_msg *msg,
+ __u32 *sqid)
+{
+ *sqid = (msg->msg[2] << 24) | (msg->msg[3] << 16) |
+ (msg->msg[4] << 8) | msg->msg[5];
+}
+
+static inline void cec_msg_request_audio_and_video_latency(struct cec_msg *msg,
+ int reply, __u8 video_format,
+ __u8 hdr_format, __u8 vrr_format,
+ __u8 audio_format,
+ __u8 audio_format_extension)
+{
+ msg->len = 6;
+ msg->msg[1] = CEC_MSG_REQUEST_AUDIO_AND_VIDEO_LATENCY;
+ msg->msg[2] = video_format;
+ msg->msg[3] = hdr_format;
+ msg->msg[4] = vrr_format;
+ msg->msg[5] = audio_format;
+ if (audio_format >= 1 && audio_format <= 31) {
+ msg->msg[6] = audio_format_extension;
+ msg->len++;
+ }
+ msg->reply = reply ? CEC_MSG_REPORT_AUDIO_AND_VIDEO_LATENCY : 0;
+}
+
+static inline void cec_ops_request_audio_and_video_latency(const struct cec_msg *msg,
+ __u8 *video_format,
+ __u8 *hdr_format,
+ __u8 *vrr_format,
+ __u8 *audio_format,
+ __u8 *audio_format_extension)
+{
+ *video_format = msg->msg[2];
+ *hdr_format = msg->msg[3];
+ *vrr_format = msg->msg[4];
+ *audio_format = msg->msg[5];
+ *audio_format_extension = msg->len > 6 ? msg->msg[6] : 0;
+}
+
+static inline void cec_msg_report_audio_and_video_latency(struct cec_msg *msg,
+ __u16 video_latency,
+ __u16 audio_latency)
+{
+ msg->len = 6;
+ msg->msg[1] = CEC_MSG_REPORT_AUDIO_AND_VIDEO_LATENCY;
+ msg->msg[2] = video_latency >> 8;
+ msg->msg[3] = video_latency & 0xff;
+ msg->msg[4] = audio_latency >> 8;
+ msg->msg[5] = audio_latency & 0xff;
+}
+
+static inline void cec_ops_report_audio_and_video_latency(const struct cec_msg *msg,
+ __u16 *video_latency,
+ __u16 * audio_latency)
+{
+ *video_latency = (msg->msg[2] << 8) | msg->msg[3];
+ *audio_latency = (msg->msg[4] << 8) | msg->msg[5];
+}
+
+static inline void cec_msg_request_audio_latency(struct cec_msg *msg,
+ int reply,
+ __u8 audio_format,
+ __u8 audio_format_extension)
+{
+ msg->len = 3;
+ msg->msg[1] = CEC_MSG_REQUEST_AUDIO_LATENCY;
+ msg->msg[2] = audio_format;
+ if (audio_format >= 1 && audio_format <= 31) {
+ msg->msg[3] = audio_format_extension;
+ msg->len++;
+ }
+ msg->reply = reply ? CEC_MSG_REPORT_AUDIO_LATENCY : 0;
+}
+
+static inline void cec_ops_request_audio_latency(const struct cec_msg *msg,
+ __u8 *audio_format,
+ __u8 *audio_format_extension)
+{
+ *audio_format = msg->msg[2];
+ *audio_format_extension = msg->len > 3 ? msg->msg[3] : 0;
+}
+
+static inline void cec_msg_report_audio_latency(struct cec_msg *msg,
+ __u16 audio_latency)
+{
+ msg->len = 4;
+ msg->msg[1] = CEC_MSG_REPORT_AUDIO_LATENCY;
+ msg->msg[2] = audio_latency >> 8;
+ msg->msg[3] = audio_latency & 0xff;
+}
+
+static inline void cec_ops_report_audio_latency(const struct cec_msg *msg,
+ __u16 *audio_latency)
+{
+ *audio_latency = (msg->msg[2] << 8) | msg->msg[3];
+}
+
+static inline void cec_msg_request_video_latency(struct cec_msg *msg,
+ int reply, __u8 video_format,
+ __u8 hdr_format,
+ __u8 vrr_format)
+{
+ msg->len = 5;
+ msg->msg[1] = CEC_MSG_REQUEST_VIDEO_LATENCY;
+ msg->msg[2] = video_format;
+ msg->msg[3] = hdr_format;
+ msg->msg[4] = vrr_format;
+ msg->reply = reply ? CEC_MSG_REPORT_VIDEO_LATENCY : 0;
+}
+
+static inline void cec_ops_request_video_latency(const struct cec_msg *msg,
+ __u8 *video_format,
+ __u8 *hdr_format,
+ __u8 *vrr_format)
+{
+ *video_format = msg->msg[2];
+ *hdr_format = msg->msg[3];
+ *vrr_format = msg->msg[4];
+}
+
+static inline void cec_msg_report_video_latency(struct cec_msg *msg,
+ __u16 video_latency)
+{
+ msg->len = 4;
+ msg->msg[1] = CEC_MSG_REPORT_VIDEO_LATENCY;
+ msg->msg[2] = video_latency >> 8;
+ msg->msg[3] = video_latency & 0xff;
+}
+
+static inline void cec_ops_report_video_latency(const struct cec_msg *msg,
+ __u16 *video_latency)
+{
+ *video_latency = (msg->msg[2] << 8) | msg->msg[3];
+}
+
+static inline void cec_msg_update_sqid(struct cec_msg *msg, __u32 sqid)
+{
+ msg->len = 6;
+ msg->msg[1] = CEC_MSG_UPDATE_SQID;
+ msg->msg[2] = sqid >> 24;
+ msg->msg[3] = (sqid >> 16) & 0xff;
+ msg->msg[4] = (sqid >> 8) & 0xff;
+ msg->msg[5] = sqid & 0xff;
+}
+
+static inline void cec_ops_update_sqid(const struct cec_msg *msg,
+ __u32 *sqid)
+{
+ *sqid = (msg->msg[2] << 24) | (msg->msg[3] << 16) |
+ (msg->msg[4] << 8) | msg->msg[5];
+}
+
+
/* Capability Discovery and Control Feature */
static inline void cec_msg_cdc_hec_inquire_state(struct cec_msg *msg,
__u16 phys_addr1,
diff --git a/include/uapi/linux/cec.h b/include/uapi/linux/cec.h
index b2af1dddd4d7..75bc9e4e0350 100644
--- a/include/uapi/linux/cec.h
+++ b/include/uapi/linux/cec.h
@@ -1104,6 +1104,30 @@ struct cec_event {
#define CEC_OP_AUD_OUT_COMPENSATED_PARTIAL_DELAY 3
+/* Latency Indication Protocol Feature */
+#define CEC_MSG_REQUEST_LIP_SUPPORT 0x50
+#define CEC_MSG_REPORT_LIP_SUPPORT 0x51
+#define CEC_MSG_REQUEST_AUDIO_AND_VIDEO_LATENCY 0x52
+/* HDR Format Operand (hdr_format) */
+#define CEC_OP_HDR_FORMAT_GAMMA_SDR 0
+#define CEC_OP_HDR_FORMAT_GAMMA_HDR 1
+#define CEC_OP_HDR_FORMAT_PQ 2
+#define CEC_OP_HDR_FORMAT_HLG 3
+#define CEC_OP_HDR_FORMAT_DYNAMIC_HDR_TYPE_1 8
+#define CEC_OP_HDR_FORMAT_DYNAMIC_HDR_TYPE_2 9
+#define CEC_OP_HDR_FORMAT_DYNAMIC_HDR_TYPE_4 11
+#define CEC_OP_HDR_FORMAT_DV_SINK_LED 16
+#define CEC_OP_HDR_FORMAT_DV_SOURCE_LED 17
+#define CEC_OP_HDR_FORMAT_HDR10PLUS 24
+#define CEC_OP_HDR_FORMAT_ETSI_TS_103_433 32
+#define CEC_MSG_REPORT_AUDIO_AND_VIDEO_LATENCY 0x53
+#define CEC_MSG_REQUEST_AUDIO_LATENCY 0x54
+#define CEC_MSG_REPORT_AUDIO_LATENCY 0x55
+#define CEC_MSG_REQUEST_VIDEO_LATENCY 0x56
+#define CEC_MSG_REPORT_VIDEO_LATENCY 0x57
+#define CEC_MSG_UPDATE_SQID 0x58
+
+
/* Capability Discovery and Control Feature */
#define CEC_MSG_CDC_MESSAGE 0xf8
/* Ethernet-over-HDMI: nobody ever does this... */
--
2.53.0
^ permalink raw reply related [flat|nested] 5+ messages in thread* [PATCH 3/4] media: cec: core: add LIP support
2026-05-06 13:34 [PATCH 0/4] media: cec: add CEC LIP support Hans Verkuil
2026-05-06 13:34 ` [PATCH 1/4] include/uapi/linux/cec*.h: " Hans Verkuil
2026-05-06 13:34 ` [PATCH 2/4] Documentation: media: add CEC opcodes Hans Verkuil
@ 2026-05-06 13:34 ` Hans Verkuil
2026-05-06 13:34 ` [PATCH 4/4] include/uapi/linux/cec*: clarify which msgs are CEC 2.0 Hans Verkuil
3 siblings, 0 replies; 5+ messages in thread
From: Hans Verkuil @ 2026-05-06 13:34 UTC (permalink / raw)
To: linux-media; +Cc: Hans Verkuil
Add support for the new CEC LIP opcodes.
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>
---
drivers/media/cec/core/cec-adap.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/media/cec/core/cec-adap.c b/drivers/media/cec/core/cec-adap.c
index 8f7244ac1d43..a90cb84a4b4d 100644
--- a/drivers/media/cec/core/cec-adap.c
+++ b/drivers/media/cec/core/cec-adap.c
@@ -1098,6 +1098,15 @@ static const u8 cec_msg_size[256] = {
[CEC_MSG_REQUEST_CURRENT_LATENCY] = 4 | BCAST,
[CEC_MSG_REPORT_CURRENT_LATENCY] = 6 | BCAST,
[CEC_MSG_CDC_MESSAGE] = 2 | BCAST,
+ [CEC_MSG_REQUEST_LIP_SUPPORT] = 4 | DIRECTED,
+ [CEC_MSG_REPORT_LIP_SUPPORT] = 6 | DIRECTED,
+ [CEC_MSG_REQUEST_AUDIO_AND_VIDEO_LATENCY] = 6 | DIRECTED,
+ [CEC_MSG_REPORT_AUDIO_AND_VIDEO_LATENCY] = 6 | DIRECTED,
+ [CEC_MSG_REQUEST_AUDIO_LATENCY] = 3 | DIRECTED,
+ [CEC_MSG_REPORT_AUDIO_LATENCY] = 4 | DIRECTED,
+ [CEC_MSG_REQUEST_VIDEO_LATENCY] = 5 | DIRECTED,
+ [CEC_MSG_REPORT_VIDEO_LATENCY] = 4 | DIRECTED,
+ [CEC_MSG_UPDATE_SQID] = 6 | DIRECTED,
};
/* Called by the CEC adapter if a message is received */
--
2.53.0
^ permalink raw reply related [flat|nested] 5+ messages in thread* [PATCH 4/4] include/uapi/linux/cec*: clarify which msgs are CEC 2.0
2026-05-06 13:34 [PATCH 0/4] media: cec: add CEC LIP support Hans Verkuil
` (2 preceding siblings ...)
2026-05-06 13:34 ` [PATCH 3/4] media: cec: core: add LIP support Hans Verkuil
@ 2026-05-06 13:34 ` Hans Verkuil
3 siblings, 0 replies; 5+ messages in thread
From: Hans Verkuil @ 2026-05-06 13:34 UTC (permalink / raw)
To: linux-media; +Cc: Hans Verkuil
Drop comments about CEC 2.0 from cec-funcs.h.
In cec.h clearly comment messages that are CEC 2.0 specific
as such. Also rename references to HDMI 2.0 to CEC 2.0.
The <Request/Report Current Latency> messages were marked
as CEC 2.0 only. That is wrong, these messages are explicitly
allowed for any CEC version.
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>
---
include/uapi/linux/cec.h | 25 ++++++++++++-------------
1 file changed, 12 insertions(+), 13 deletions(-)
diff --git a/include/uapi/linux/cec.h b/include/uapi/linux/cec.h
index 75bc9e4e0350..81a05c9c0706 100644
--- a/include/uapi/linux/cec.h
+++ b/include/uapi/linux/cec.h
@@ -742,7 +742,7 @@ struct cec_event {
#define CEC_OP_PRIM_DEVTYPE_PROCESSOR 7
#define CEC_MSG_SET_MENU_LANGUAGE 0x32
-#define CEC_MSG_REPORT_FEATURES 0xa6 /* HDMI 2.0 */
+#define CEC_MSG_REPORT_FEATURES 0xa6 /* CEC 2.0 */
/* All Device Types Operand (all_device_types) */
#define CEC_OP_ALL_DEVTYPE_TV 0x80
#define CEC_OP_ALL_DEVTYPE_RECORD 0x40
@@ -777,7 +777,7 @@ struct cec_event {
#define CEC_OP_FEAT_DEV_SOURCE_HAS_ARC_RX 0x02
#define CEC_OP_FEAT_DEV_HAS_SET_AUDIO_VOLUME_LEVEL 0x01
-#define CEC_MSG_GIVE_FEATURES 0xa5 /* HDMI 2.0 */
+#define CEC_MSG_GIVE_FEATURES 0xa5 /* CEC 2.0 */
/* Deck Control Feature */
@@ -1067,7 +1067,7 @@ struct cec_event {
#define CEC_OP_AUD_FMT_ID_CEA861 0
#define CEC_OP_AUD_FMT_ID_CEA861_CXT 1
-#define CEC_MSG_SET_AUDIO_VOLUME_LEVEL 0x73
+#define CEC_MSG_SET_AUDIO_VOLUME_LEVEL 0x73 /* CEC 2.0 */
/* Audio Rate Control Feature */
#define CEC_MSG_SET_AUDIO_RATE 0x9a
@@ -1091,7 +1091,6 @@ struct cec_event {
/* Dynamic Audio Lipsync Feature */
-/* Only for CEC 2.0 and up */
#define CEC_MSG_REQUEST_CURRENT_LATENCY 0xa7
#define CEC_MSG_REPORT_CURRENT_LATENCY 0xa8
/* Low Latency Mode Operand (low_latency_mode) */
@@ -1105,9 +1104,9 @@ struct cec_event {
/* Latency Indication Protocol Feature */
-#define CEC_MSG_REQUEST_LIP_SUPPORT 0x50
-#define CEC_MSG_REPORT_LIP_SUPPORT 0x51
-#define CEC_MSG_REQUEST_AUDIO_AND_VIDEO_LATENCY 0x52
+#define CEC_MSG_REQUEST_LIP_SUPPORT 0x50 /* CEC 2.0 */
+#define CEC_MSG_REPORT_LIP_SUPPORT 0x51 /* CEC 2.0 */
+#define CEC_MSG_REQUEST_AUDIO_AND_VIDEO_LATENCY 0x52 /* CEC 2.0 */
/* HDR Format Operand (hdr_format) */
#define CEC_OP_HDR_FORMAT_GAMMA_SDR 0
#define CEC_OP_HDR_FORMAT_GAMMA_HDR 1
@@ -1120,12 +1119,12 @@ struct cec_event {
#define CEC_OP_HDR_FORMAT_DV_SOURCE_LED 17
#define CEC_OP_HDR_FORMAT_HDR10PLUS 24
#define CEC_OP_HDR_FORMAT_ETSI_TS_103_433 32
-#define CEC_MSG_REPORT_AUDIO_AND_VIDEO_LATENCY 0x53
-#define CEC_MSG_REQUEST_AUDIO_LATENCY 0x54
-#define CEC_MSG_REPORT_AUDIO_LATENCY 0x55
-#define CEC_MSG_REQUEST_VIDEO_LATENCY 0x56
-#define CEC_MSG_REPORT_VIDEO_LATENCY 0x57
-#define CEC_MSG_UPDATE_SQID 0x58
+#define CEC_MSG_REPORT_AUDIO_AND_VIDEO_LATENCY 0x53 /* CEC 2.0 */
+#define CEC_MSG_REQUEST_AUDIO_LATENCY 0x54 /* CEC 2.0 */
+#define CEC_MSG_REPORT_AUDIO_LATENCY 0x55 /* CEC 2.0 */
+#define CEC_MSG_REQUEST_VIDEO_LATENCY 0x56 /* CEC 2.0 */
+#define CEC_MSG_REPORT_VIDEO_LATENCY 0x57 /* CEC 2.0 */
+#define CEC_MSG_UPDATE_SQID 0x58 /* CEC 2.0 */
/* Capability Discovery and Control Feature */
--
2.53.0
^ permalink raw reply related [flat|nested] 5+ messages in thread