diff options
| author | Hans Verkuil <hans.verkuil@cisco.com> | 2018-08-27 10:58:17 +0300 |
|---|---|---|
| committer | Hans Verkuil <hans.verkuil@cisco.com> | 2018-08-31 11:20:38 +0300 |
| commit | 9bcf6d9868ae95fc7e5eda3dae5200f234ea5623 (patch) | |
| tree | 0816f3162ccfc4be5acb688ba787de3bbeed8790 | |
| parent | 5ce70c799ac22c142061c71aaeae518f04283472 (diff) | |
| download | linux-9bcf6d9868ae95fc7e5eda3dae5200f234ea5623.tar.xz | |
drm_dp_cec: add note about good MegaChips 2900 CEC support
A big problem with DP CEC-Tunneling-over-AUX is that it is tricky
to find adapters with a chipset that supports this AND where the
manufacturer actually connected the HDMI CEC line to the chipset.
Add a mention of the MegaChips 2900 chipset which seems to support
this feature well.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180827075820.41109-3-hverkuil@xs4all.nl
| -rw-r--r-- | drivers/gpu/drm/drm_dp_cec.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/gpu/drm/drm_dp_cec.c b/drivers/gpu/drm/drm_dp_cec.c index 1407b13a8d5d..8a718f85079a 100644 --- a/drivers/gpu/drm/drm_dp_cec.c +++ b/drivers/gpu/drm/drm_dp_cec.c @@ -16,7 +16,9 @@ * here. Quite a few active (mini-)DP-to-HDMI or USB-C-to-HDMI adapters * have a converter chip that supports CEC-Tunneling-over-AUX (usually the * Parade PS176), but they do not wire up the CEC pin, thus making CEC - * useless. + * useless. Note that MegaChips 2900-based adapters appear to have good + * support for CEC tunneling. Those adapters that I have tested using + * this chipset all have the CEC line connected. * * Sadly there is no way for this driver to know this. What happens is * that a /dev/cecX device is created that is isolated and unable to see |