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drm: add support for DisplayPort CEC-Tunneling-over-AUX

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This adds support for the DisplayPort CEC-Tunneling-over-AUX
feature that is part of the DisplayPort 1.3 standard.

Unfortunately, not all DisplayPort/USB-C to HDMI adapters with a
chip that has this capability actually hook up the CEC pin, so
even though a CEC device is created, it may not actually work.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180711132909.25409-2-hverkuil@xs4all.nl
This commit is contained in:
Hans Verkuil
2018-07-11 15:29:07 +02:00
committed by Ville Syrjälä
parent cf19fa2cfa
commit 2c6d1fffa1
5 changed files with 496 additions and 0 deletions
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1
drivers/gpu/drm/drm_dp_helper.c
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@@ -1087,6 +1087,7 @@ static void drm_dp_aux_crc_work(struct work_struct *work)
void drm_dp_aux_init(struct drm_dp_aux *aux)
{
mutex_init(&aux->hw_mutex);
mutex_init(&aux->cec.lock);
INIT_WORK(&aux->crc_work, drm_dp_aux_crc_work);
aux->ddc.algo = &drm_dp_i2c_algo;