Hi Hans This is a very useful little series - thanks. On Wed, 21 Aug 2024 at 15:16, Hans Verkuil <hverkuil-cisco@xxxxxxxxx> wrote: > > Export InfoFrames to debugfs. I had a tc358743 to hand, so thought this warranted a quick test. I think you have an off-by-one on the length that this exposes. log_status is giving me state [ 428.600874] tc358743 10-000f: -----HDMI status----- [ 428.600881] tc358743 10-000f: HDCP encrypted content: no [ 428.600887] tc358743 10-000f: Input color space: RGB limited range [ 428.601404] tc358743 10-000f: AV Mute: off [ 428.601921] tc358743 10-000f: Deep color mode: 8-bits per channel [ 428.604407] tc358743 10-000f: HDMI infoframe: Auxiliary Video Information (AVI), version 2, length 13 [ 428.604425] tc358743 10-000f: colorspace: RGB [ 428.604433] tc358743 10-000f: scan mode: Underscan [ 428.604441] tc358743 10-000f: colorimetry: No Data [ 428.604449] tc358743 10-000f: picture aspect: 16:9 [ 428.604456] tc358743 10-000f: active aspect: Same as Picture [ 428.604463] tc358743 10-000f: itc: No Data [ 428.604469] tc358743 10-000f: extended colorimetry: xvYCC 601 [ 428.604476] tc358743 10-000f: quantization range: Limited [ 428.604483] tc358743 10-000f: nups: Unknown Non-uniform Scaling [ 428.604490] tc358743 10-000f: video code: 4 [ 428.604497] tc358743 10-000f: ycc quantization range: Limited [ 428.604505] tc358743 10-000f: hdmi content type: Graphics [ 428.604511] tc358743 10-000f: pixel repeat: 0 [ 428.604519] tc358743 10-000f: bar top 0, bottom 0, left 0, right 0 pi@bookworm64:~/edid-decode $ xxd /sys/kernel/debug/v4l2/tc358743\ 10-000f/infoframes/avi 00000000: 8202 0d2d 1228 0404 0000 0000 0000 0000 ...-.(.......... At the transmitting end I've got pi@bookworm64:~/edid-decode $ sudo xxd /sys/kernel/debug/dri/1/HDMI-A-1/infoframes/avi 00000000: 8202 0d2d 1228 0404 0000 0000 0000 0000 ...-.(.......... 00000010: 00 edid-decode -I decodes the latter fine, but aborts on the former. Oddly the "fail" message from parse_if_hdr [1] doesn't get printed, it just stops with pi@bookworm64:~/edid-decode $ ./build/edid-decode -I /sys/kernel/debug/v4l2/tc358743\ 10-000f/infoframes/avi edid-decode InfoFrame (hex): 82 02 0d 2d 12 28 04 04 00 00 00 00 00 00 00 00 ---------------- HDMI InfoFrame Checksum: 0x2d AVI InfoFrame Version: 2 Length: 13 [1] https://git.linuxtv.org/edid-decode.git/tree/parse-if.cpp#n21 > Signed-off-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx> > --- > drivers/media/i2c/tc358743.c | 36 +++++++++++++++++++++++++++++++++++- > 1 file changed, 35 insertions(+), 1 deletion(-) > > diff --git a/drivers/media/i2c/tc358743.c b/drivers/media/i2c/tc358743.c > index 65d58ddf0287..c7652c0dbaeb 100644 > --- a/drivers/media/i2c/tc358743.c > +++ b/drivers/media/i2c/tc358743.c > @@ -87,6 +87,10 @@ struct tc358743_state { > struct timer_list timer; > struct work_struct work_i2c_poll; > > + /* debugfs */ > + struct dentry *debugfs_dir; > + struct v4l2_debugfs_if *infoframes; > + > /* edid */ > u8 edid_blocks_written; > > @@ -430,12 +434,35 @@ static void tc358743_erase_bksv(struct v4l2_subdev *sd) > > /* --------------- AVI infoframe --------------- */ > > +static ssize_t > +tc358743_debugfs_if_read(u32 type, void *priv, struct file *filp, > + char __user *ubuf, size_t count, loff_t *ppos) > +{ > + u8 buf[V4L2_DEBUGFS_IF_MAX_LEN] = {}; > + struct v4l2_subdev *sd = priv; > + int len; > + > + if (!is_hdmi(sd)) > + return 0; > + > + if (type != V4L2_DEBUGFS_IF_AVI) > + return 0; > + > + i2c_rd(sd, PK_AVI_0HEAD, buf, PK_AVI_16BYTE - PK_AVI_0HEAD + 1); > + len = buf[2] + 3; tda1997x has len = buffer[2] + 4; adv7842 and adv7604 have len = buf[2] + 1; and then return len + 3; adv7511 has len = buffer[2]; and return len + 4; So I think this should be len = buf[2] + 4; Doing so makes edid-decode happy. pi@bookworm64:~/edid-decode $ sudo ./build/edid-decode -I /sys/kernel/debug/v4l2/tc358743\ 10-000f/infoframes/avi edid-decode InfoFrame (hex): 82 02 0d 2d 12 28 04 04 00 00 00 00 00 00 00 00 00 ---------------- HDMI InfoFrame Checksum: 0x2d AVI InfoFrame Version: 2 Length: 13 VIC 4: 1280x720 60.000000 Hz 16:9 45.000 kHz 74.250000 MHz Y: Color Component Sample Format: RGB A: Active Format Information Present: Yes B: Bar Data Present: Bar Data not present S: Scan Information: Composed for an underscanned display C: Colorimetry: No Data M: Picture Aspect Ratio: 16:9 R: Active Portion Aspect Ratio: 8 ITC: IT Content: No Data EC: Extended Colorimetry: xvYCC601 Q: RGB Quantization Range: Limited Range SC: Non-Uniform Picture Scaling: No Known non-uniform scaling YQ: YCC Quantization Range: Limited Range CN: IT Content Type: Graphics PR: Pixel Data Repetition Count: 0 Line Number of End of Top Bar: 0 Line Number of Start of Bottom Bar: 0 Pixel Number of End of Left Bar: 0 Pixel Number of Start of Right Bar: 0 I haven't double checked the maths to ensure that we have read that extra byte via i2c_rd though. Dave > + if (len > V4L2_DEBUGFS_IF_MAX_LEN) > + len = -ENOENT; > + if (len > 0) > + len = simple_read_from_buffer(ubuf, count, ppos, buf, len); > + return len < 0 ? 0 : len; > +} > + > static void print_avi_infoframe(struct v4l2_subdev *sd) > { > struct i2c_client *client = v4l2_get_subdevdata(sd); > struct device *dev = &client->dev; > union hdmi_infoframe frame; > - u8 buffer[HDMI_INFOFRAME_SIZE(AVI)]; > + u8 buffer[HDMI_INFOFRAME_SIZE(AVI)] = {}; > > if (!is_hdmi(sd)) { > v4l2_info(sd, "DVI-D signal - AVI infoframe not supported\n"); > @@ -2161,6 +2188,11 @@ static int tc358743_probe(struct i2c_client *client) > if (err < 0) > goto err_work_queues; > > + state->debugfs_dir = debugfs_create_dir(sd->name, v4l2_debugfs_root()); > + state->infoframes = v4l2_debugfs_if_alloc(state->debugfs_dir, > + V4L2_DEBUGFS_IF_AVI, sd, > + tc358743_debugfs_if_read); > + > v4l2_info(sd, "%s found @ 0x%x (%s)\n", client->name, > client->addr << 1, client->adapter->name); > > @@ -2188,6 +2220,8 @@ static void tc358743_remove(struct i2c_client *client) > flush_work(&state->work_i2c_poll); > } > cancel_delayed_work_sync(&state->delayed_work_enable_hotplug); > + v4l2_debugfs_if_free(state->infoframes); > + debugfs_remove_recursive(state->debugfs_dir); > cec_unregister_adapter(state->cec_adap); > v4l2_async_unregister_subdev(sd); > v4l2_device_unregister_subdev(sd); > -- > 2.43.0 >
